Re: I'm trying to make proper urls, but I seem to be failing at it.
What are url-encode and url-decode doing wrong? They look like they should work (e.g. https://github.com/ring-clojure/ring-codec/blob/master/test/ring/util/test/codec.clj#L21). On 25 February 2014 07:14, David Toomey dbtoo...@gmail.com wrote: I'm building a site and I would like to allow users to create and account, and I would like them to have an option to use whitespaces in their handle. Apparently I am doing something way wrong here, so it is possible that I messed up something somewhere else. When I create a user, for example some user, this user name is inserted into a database. The site is set up so that users can have profiles. This person's profile would be this: www.mysite/some user That is bad. I am hoping to have profile pages look like this: www.mysite/some%20user or: www.mysite/some-user I attempted to use (url-encode), (url-decode), regex, and all sorts of things. Nothing I have tried has worked. I'm actually kind of surprised that this isn't baked into Compojure itself, but I digress. Thanks; -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Robert K. Day robert@merton.oxon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: why not apply-macro
hi JW,
First thank you for your reply.
my origin question is somethine about redis.here i refer
https://github.com/ptaoussanis/carmine
I follow this two line
(def server1-conn {:pool {opts} :spec {opts}}) ; See `wcar` docstring
for opts
(defmacro wcar* [ body] `(car/wcar server1-conn ~@body))
then I can exec some redis commands,but I want to exec commands dynamicly.
for example I here a vector [[foo bar][hello world]]
i want to exec following commands
(wcar* (car/set foo bar) (car/set hello world))
so i have write a macro like this
(defmacro batchly-redis [cmd params]
(let [car-fns (map #(cons cmd %) params)]
`(wcar* ~@car-fns)))
then I can invoke this macro using this way
(batchly-redis cat/set [[foo bar][hello world]])
in this way,my macro works ok.but here my vector is coming from the return
of other fn ,so as you said above,this will not work, because marco
evaluates args at compile time.Do your have some ideas on my problem.
Really thanks
在 2014年2月24日星期一UTC+8下午6时29分09秒，Jozef Wagner写道：
Well the evil thing is that apply-macro evaluates arguments at compile
time. Example where this won't work follows
(defn foo [numbers]
(apply-macro + numbers))
JW
On Mon, Feb 24, 2014 at 10:27 AM, 刘家财 jiaca...@gmail.com javascript:wrote:
I have one problem using Clojure
we all know there is a apply for a fn to prepend intervening arguments to
args.
such as (apply + [2 3]) will equals to (+ 2 3)
this is really handy,
BUT,this is no apply-macro fn to use,I find a contrib(
https://github.com/clojure/clojure-contrib/blob/73accf597eafb8dfcb642702a3b98b057bbdbbdf/src/main/clojure/clojure/contrib/apply_macro.clj#L34)
which has somethine like this,but deprecated.
and says it is evil,I can't understand why the docs says it was evil?
Is there anything harmful? Can someone show me some examples?
Thank U
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Re: Email delivery libs not working
I managed to get Postal delivery working with Mandrill, still use of
templates with formatting v helpful. Mailer and Postal have a slight
problem on recognizing the meta info for smtp auth.
So with some fiddling figured out how to merge Clostache into Postal for
html templates with dynamic vars as follows:
dependencies: [com.draines/postal 1.11.1]
[de.ubercode.clostache/clostache 1.3.1]
(:use clostache.parser)
(:require [postal.core :as postal]
(postal/send-message
^{:host smtp.mandrillapp.com
:user your mandrill acct email address
:pass your mandrill api key
:port 587}
{:type text/html
:from from email address
:to to email address
:subject (render Hi from {{firstname}} {:firstname (session/get
:firstname)})
:body [{:type text/html; charset=utf-8
:content (render-resource
email/templates/hello.html.mustache
{:name Uncle Scooby :memberid (session/get :member-id)})
}] })
The hello.html.mustache template file:
Hello {{name}},br /br /
My member id is: {{memberid}}br /br /
Best,br /
Scrappy Doo.
The template path root is the app src folder. So your
app/src/email/templates/hello.html.mustache
So this works but the use of Clostache still seems a bit boilerplatish.
Does anyone know of a more elegant option if possible.
Thank you for the other tips, will try out the native java and the other
Mandrill code option, see which is the best overall approach long term.
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Re: Email delivery libs not working
2014-02-25 14:08 GMT+04:00 The Dude (Abides) exel...@gmail.com:
(postal/send-message
^{:host smtp.mandrillapp.com
:user your mandrill acct email address
:pass your mandrill api key
:port 587}
{:type text/html
:from from email address
:to to email address
:subject (render Hi from {{firstname}} {:firstname (session/get
:firstname)})
:body [{:type text/html; charset=utf-8
:content (render-resource
email/templates/hello.html.mustache
{:name Uncle Scooby :memberid (session/get :member-id)})
}] })
Let me just say that the choice to use metadata to pass crucial connection
arguments
in Postal was wrong.
We will be replacing Postal in ClojureWerkz Mailer for this reason.
--
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http://github.com/michaelklishin
http://twitter.com/michaelklishin
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Re: why not apply-macro
You could just write it as a function and leave out wcar*.
(defn batchly-redis [cmd params]
(doseq [params]
(apply cmd params)))
Then to execute:
(wcar* (batchly-redis cat/set parameters))
As far as I can tell, wcar is just a container macro, like with-open, in
that it initiates the connection and then cleans up after itself. Within
wcar, you can execute functions in whatever way you want.
- James
On 25 February 2014 09:00, 刘家财 jiacai2...@gmail.com wrote:
hi JW,
First thank you for your reply.
my origin question is somethine about redis.here i refer
https://github.com/ptaoussanis/carmine
I follow this two line
(def server1-conn {:pool {opts} :spec {opts}}) ; See `wcar`
docstring for opts
(defmacro wcar* [ body] `(car/wcar server1-conn ~@body))
then I can exec some redis commands,but I want to exec commands dynamicly.
for example I here a vector [[foo bar][hello world]]
i want to exec following commands
(wcar* (car/set foo bar) (car/set hello world))
so i have write a macro like this
(defmacro batchly-redis [cmd params]
(let [car-fns (map #(cons cmd %) params)]
`(wcar* ~@car-fns)))
then I can invoke this macro using this way
(batchly-redis cat/set [[foo bar][hello world]])
in this way,my macro works ok.but here my vector is coming from the return
of other fn ,so as you said above,this will not work, because marco
evaluates args at compile time.Do your have some ideas on my problem.
Really thanks
在 2014年2月24日星期一UTC+8下午6时29分09秒，Jozef Wagner写道：
Well the evil thing is that apply-macro evaluates arguments at compile
time. Example where this won't work follows
(defn foo [numbers]
(apply-macro + numbers))
JW
On Mon, Feb 24, 2014 at 10:27 AM, 刘家财 jiaca...@gmail.com wrote:
I have one problem using Clojure
we all know there is a apply for a fn to prepend intervening arguments
to args.
such as (apply + [2 3]) will equals to (+ 2 3)
this is really handy,
BUT,this is no apply-macro fn to use,I find a contrib(
https://github.com/clojure/clojure-contrib/blob/
73accf597eafb8dfcb642702a3b98b057bbdbbdf/src/main/clojure/
clojure/contrib/apply_macro.clj#L34) which has somethine like this,but
deprecated.
and says it is evil,I can't understand why the docs says it was evil?
Is there anything harmful? Can someone show me some examples?
Thank U
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Why is Clojure faster than Java at this task?
I recently did a benchmark (admittedly in hindsight not a particularly good one) that involved comparison of an implementation of the same small program in Javahttps://github.com/logicchains/ArrayAccessBench/blob/master/Java3.javaand in Clojurehttps://github.com/logicchains/ArrayAccessBench/blob/master/cjmt/src/cjmt/core.clj, in which most of the time is spent in bignum operations. The results are at this linkhttp://togototo.wordpress.com/2014/02/22/memory-access-microbenchmark-clojure-f-go-julia-lua-racket-ruby-self/(the tables at the top; ignore the rest). The Clojure implementation appears to consistently perform better than the Java implementation (at least on this setup, x86-64 Linux with OpenJDK 1.7.0_25). I'd be interested to learn what Clojure does to make it perform faster than Java in this case, so I thought here might be a good place to ask. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Email delivery libs not working
Let me know whenever its updated, dynamic email and img resize v heavy use
cases.
You guys are doing an amazing job with all the libs, most of them higher end
stuff. I've never done msg queuing or used a graph db, so looking forward to
expanding. Its a polygot reality hereon.
P.
On Feb 25, 2014, at 2:12 AM, Michael Klishin wrote:
2014-02-25 14:08 GMT+04:00 The Dude (Abides) exel...@gmail.com:
(postal/send-message
^{:host smtp.mandrillapp.com
:user your mandrill acct email address
:pass your mandrill api key
:port 587}
{:type text/html
:from from email address
:to to email address
:subject (render Hi from {{firstname}} {:firstname (session/get
:firstname)})
:body [{:type text/html; charset=utf-8
:content (render-resource email/templates/hello.html.mustache
{:name Uncle Scooby :memberid (session/get :member-id)}) }]
})
Let me just say that the choice to use metadata to pass crucial connection
arguments
in Postal was wrong.
We will be replacing Postal in ClojureWerkz Mailer for this reason.
--
MK
http://github.com/michaelklishin
http://twitter.com/michaelklishin
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Re: why not apply-macro
Hi James,
I really appreciate your code,it really help me much.
just a little modification:
(defn batchly-redis [cmd params]
(doseq [p params]
(apply cmd p)))
doseq requires an even number of args
在 2014年2月25日星期二UTC+8下午6时33分48秒，James Reeves写道：
You could just write it as a function and leave out wcar*.
(defn batchly-redis [cmd params]
(doseq [params]
(apply cmd params)))
Then to execute:
(wcar* (batchly-redis cat/set parameters))
As far as I can tell, wcar is just a container macro, like with-open, in
that it initiates the connection and then cleans up after itself. Within
wcar, you can execute functions in whatever way you want.
- James
On 25 February 2014 09:00, 刘家财 jiaca...@gmail.com javascript: wrote:
hi JW,
First thank you for your reply.
my origin question is somethine about redis.here i refer
https://github.com/ptaoussanis/carmine
I follow this two line
(def server1-conn {:pool {opts} :spec {opts}}) ; See `wcar`
docstring for opts
(defmacro wcar* [ body] `(car/wcar server1-conn ~@body))
then I can exec some redis commands,but I want to exec commands dynamicly.
for example I here a vector [[foo bar][hello world]]
i want to exec following commands
(wcar* (car/set foo bar) (car/set hello world))
so i have write a macro like this
(defmacro batchly-redis [cmd params]
(let [car-fns (map #(cons cmd %) params)]
`(wcar* ~@car-fns)))
then I can invoke this macro using this way
(batchly-redis cat/set [[foo bar][hello world]])
in this way,my macro works ok.but here my vector is coming from the
return of other fn ,so as you said above,this will not work, because marco
evaluates args at compile time.Do your have some ideas on my problem.
Really thanks
在 2014年2月24日星期一UTC+8下午6时29分09秒，Jozef Wagner写道：
Well the evil thing is that apply-macro evaluates arguments at compile
time. Example where this won't work follows
(defn foo [numbers]
(apply-macro + numbers))
JW
On Mon, Feb 24, 2014 at 10:27 AM, 刘家财 jiaca...@gmail.com wrote:
I have one problem using Clojure
we all know there is a apply for a fn to prepend intervening arguments
to args.
such as (apply + [2 3]) will equals to (+ 2 3)
this is really handy,
BUT,this is no apply-macro fn to use,I find a contrib(
https://github.com/clojure/clojure-contrib/blob/
73accf597eafb8dfcb642702a3b98b057bbdbbdf/src/main/clojure/
clojure/contrib/apply_macro.clj#L34) which has somethine like this,but
deprecated.
and says it is evil,I can't understand why the docs says it was evil?
Is there anything harmful? Can someone show me some examples?
Thank U
--
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ANN: Chord 0.3.0 - WebSockets as core.async channels
I've just pushed v0.3.0 of Chord, a library to make a WebSockets appear as a bi-directional core.async channels. More info on GitHub https://github.com/james-henderson/chord. New since 0.2.2: - Messages over the channel treated as EDN by default (although option to fall back to previous raw strings) - this saves wrapping every write with `pr-str` and every read with `edn/read-string` As usual, feedback welcome! Cheers, James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Image Resizer lib exception error
Hi, I'm trying to use Image Resizer and am goofing up on the syntax somewhere: (defn update-profile [firstname lastname email file] (let [member-id (session/get :member-id) redirecturl (str /member/ member-id) original-file-path(str (img-path) / (:filename file)) new-file-name (add-timestamp (:filename file)) new-name-filepath (str (img-path) / new-file-name)] (upload-file (img-path) (update-in file [:filename] add-timestamp)) (- new-name-filepath ((resize-fn 100 100))) (memberdb/update-member member-id firstname lastname email (str new-file-name)) (resp/redirect redirecturl) )) I get the following error: java.lang.IllegalArgumentException No matching method found: read Reflector.java:80clojure.lang.Reflector.invokeMatchingMethod Reflector.java:207clojure.lang.Reflector.invokeStaticMethodutil.clj:10 image-resizer.util/buffered-imageresize.clj:31 image-resizer.resize/resize-fn[fn]members.clj:101 sikhpyar.routes.members/update-profile2members.clj:168 sikhpyar.routes.members/fncore.clj:94compojure.core/make-route[fn] core.clj:40compojure.core/if-route[fn]core.clj:25 compojure.core/if-method[fn]core.clj:107compojure.core/routing[fn] core.clj:2443clojure.core/somecore.clj:107compojure.core/routing Does anyone have any experience with this lib and the correct way to employ it, I'm not making much progress from the readme docs. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Image Resizer lib exception error
Just from the looks of the exception, you might need to pass an input-stream or reader instead of a path. The Dude (Abides) writes: Hi, I'm trying to use Image Resizer and am goofing up on the syntax somewhere: (defn update-profile [firstname lastname email file] (let [member-id (session/get :member-id) redirecturl (str /member/ member-id) original-file-path(str (img-path) / (:filename file)) new-file-name (add-timestamp (:filename file)) new-name-filepath (str (img-path) / new-file-name)] (upload-file (img-path) (update-in file [:filename] add-timestamp)) (- new-name-filepath ((resize-fn 100 100))) (memberdb/update-member member-id firstname lastname email (str new-file-name)) (resp/redirect redirecturl) )) I get the following error: java.lang.IllegalArgumentException No matching method found: read Reflector.java:80clojure.lang.Reflector.invokeMatchingMethod Reflector.java:207clojure.lang.Reflector.invokeStaticMethodutil.clj:10 image-resizer.util/buffered-imageresize.clj:31 image-resizer.resize/resize-fn[fn]members.clj:101 sikhpyar.routes.members/update-profile2members.clj:168 sikhpyar.routes.members/fncore.clj:94compojure.core/make-route[fn] core.clj:40compojure.core/if-route[fn]core.clj:25 compojure.core/if-method[fn]core.clj:107compojure.core/routing[fn] core.clj:2443clojure.core/somecore.clj:107compojure.core/routing Does anyone have any experience with this lib and the correct way to employ it, I'm not making much progress from the readme docs. Thanks. -- Moritz Ulrich pgpzSjHvaFY_D.pgp Description: PGP signature
Re: Image Resizer lib exception error
2014-02-25 16:46 GMT+04:00 Moritz Ulrich mor...@tarn-vedra.de: Just from the looks of the exception, you might need to pass an input-stream or reader instead of a path. which can be instantiated with http://clojuredocs.org/clojure_core/clojure.java.io/input-stream and http://clojuredocs.org/clojure_core/clojure.java.io/reader -- MK http://github.com/michaelklishin http://twitter.com/michaelklishin -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Why is Clojure faster than Java at this task?
It looks like an improvement in clojure.lang.BigInt over java.math.BigInteger - BigInt's add() method seems to do a long + long add if it doesn't overflow (https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/BigInt.java#L142) and only fall back to BigInteger's add method (which has no such optimisation - http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/math/BigInteger.java#BigInteger.add%28java.math.BigInteger%29) if the overhead of BigInteger is actually needed. If you use clojure.lang.BigInt in your Java code, I suspect Java will be faster. On 25 February 2014 10:38, Jonathan Barnard jonathan.t.barn...@gmail.com wrote: I recently did a benchmark (admittedly in hindsight not a particularly good one) that involved comparison of an implementation of the same small program in Java and in Clojure, in which most of the time is spent in bignum operations. The results are at this link (the tables at the top; ignore the rest). The Clojure implementation appears to consistently perform better than the Java implementation (at least on this setup, x86-64 Linux with OpenJDK 1.7.0_25). I'd be interested to learn what Clojure does to make it perform faster than Java in this case, so I thought here might be a good place to ask. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Robert K. Day robert@merton.oxon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: I'm trying to make proper urls, but I seem to be failing at it.
You can use the default Java classes which are available: = (- (java.net.URI. http www.mysite /some user nil) .toURL .toString) http://www.mysite/some%20user; = ring-codec is easy too: (https://github.com/ring-clojure/ring-codec) = (str www.mysite/ (ring.util.codec/url-encode some user)) www.mysite/some%20user = (2014/02/25 16:14), David Toomey wrote: I'm building a site and I would like to allow users to create and account, and I would like them to have an option to use whitespaces in their handle. Apparently I am doing something way wrong here, so it is possible that I messed up something somewhere else. When I create a user, for example some user, this user name is inserted into a database. The site is set up so that users can have profiles. This person's profile would be this: www.mysite/some user That is bad. I am hoping to have profile pages look like this: www.mysite/some%20user or: www.mysite/some-user I attempted to use (url-encode), (url-decode), regex, and all sorts of things. Nothing I have tried has worked. I'm actually kind of surprised that this isn't baked into Compojure itself, but I digress. Thanks; -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Why is Clojure faster than Java at this task?
Hi Jonathan, I provided the Clojure pull request btw. I think Rob's explanation is correct. Alex On Tuesday, February 25, 2014 7:20:46 AM UTC-6, Rob Day wrote: It looks like an improvement in clojure.lang.BigInt over java.math.BigInteger - BigInt's add() method seems to do a long + long add if it doesn't overflow ( https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/BigInt.java#L142) and only fall back to BigInteger's add method (which has no such optimisation - http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/math/BigInteger.java#BigInteger.add%28java.math.BigInteger%29) if the overhead of BigInteger is actually needed. If you use clojure.lang.BigInt in your Java code, I suspect Java will be faster. On 25 February 2014 10:38, Jonathan Barnard jonathan@gmail.com javascript: wrote: I recently did a benchmark (admittedly in hindsight not a particularly good one) that involved comparison of an implementation of the same small program in Java and in Clojure, in which most of the time is spent in bignum operations. The results are at this link (the tables at the top; ignore the rest). The Clojure implementation appears to consistently perform better than the Java implementation (at least on this setup, x86-64 Linux with OpenJDK 1.7.0_25). I'd be interested to learn what Clojure does to make it perform faster than Java in this case, so I thought here might be a good place to ask. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- Robert K. Day rober...@merton.oxon.org javascript: -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
How to override the default port on 3000?
I do like this: #lein new compojure-app guestbook #cd guestbook #lein ring server The server runs on port 3000 by default. But how to override the default port? Such as runs on port 80? thinks -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Help with data structures and dereferencing
new to clojure, in the process of unlearning years of OO. sorry for the long post. struggling with a design/impl and hoping to get some outside opinions so I can understand my options (clojure better) basic concepts are straightforward and in a nutshell I'm modeling entities and relationships (aren't we all) --- created a pool of entities (people and groups) implemented as maps. each map has a :rels which is set of relationships to other entities. the pool is an atom. first approach; relationships are in the entity, add RHS entities into the LHS :rels. the state of the RHS can change, I need the latest state of RHS not as it was when the relationship was created. I decided not to make each entity a ref (ref, atom, agent), it seemed too fine grained. *thoughts?* each entity has a uuid second approach, a pool of relationships (:lhs uuid :rhs uuid :type x). pool has all the relationships, also an atom. the pool has lots of benefits it improves other parts of the code. it doesn't solve the original problem, just moves it around, i still can't put the actual RHS, so i'm using the uuid as a reference, i look up RHS get the latest. (second guessing why didn't i make them atoms and use @uuid). now my relationships aren't embedded in my entity, that doesn't feel right, anyone dealing with the entity should still be able to say... (:rels entity) and get the relationships, so i add a function to :rels that returns all the relationship based on the uuid of the LHS, this works great. syntax changes and requires me to use ((:rels entity)). *the problem is... (assumes everything within a single process)* I want to pass this data structure around and now dereferencing is bleeding out. Instead of passing around a data structure, I'm passing around a data structure that has functions embedded in it. which seems like a cool idea, but now the callee needs to know that :rels returns a function, when it's supposed to have data in it. (which is the same thing?) but I don't know how to treat it seamlessly. (i have not considered eval). for the :rels it's not too bad. doesn't feel like I'm using all the power correctly, but it works. *additional problem is, my rels look like this.* (:lhs uuid :rhs uuid :type x) :lhs and :rhs should be entities, not references. more functions? I make :lhs and :rhs return functions which dereference entities. of course that makes selecting from rel-pool much harder that's when I knew I had to seek professional help [image: (smile)] even with a long post hard to capture all the requirements... 1. the pools aren't supposed to be public so I can't have all the callee functions understanding how to do the dereference. 2. the :rels function isn't one function, the truth is the rels-pool doesn't have all relationships, some are virtual, the function creates them on the fly, each entity could have it's own version of get-relationships any help is appreciated. i've considered - creating a function that denormalizes the data before sending it out to. now its fully formed but i lose some recency (not much diff i know) - centralizing all the derefs functions - so the callee knows that all the data isn't embedded but the functions don't live in structure, just the uuids... that works well for LHS/RHS deref, but makes the per entity virtual relationships much harder. - rethinking my atom granularity and using @ but i don't think that really helps thanks for reading -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[GSoC]: How to participate
Hello, all, There were a number of questions about how to participate in Clojure's Google Summer of Code effort in my last GSoC post, enough that I felt it warranted its own thread. There is a section on the wiki about getting involved [1], but I'll make a few suggestions here. Everyone Please talk about GSoC at your Clojure user group meetings. If you happen to work at a university, the GSoC team has some materials available [2] if you are interested in putting on a promotional event. Mentors === If you are interested in being a mentor, even as a secondary/backup mentor, there are a few things you can do: 1. Sign up to be a mentor on Melange [3]. You will need to sign in with a Google account, create a profile, and request a connection with Clojure. 2. If you have any ideas that are not on our Project Ideas page [4], please add them. If you don't have write access to the wiki, feel free to post them to this mailing list with '[GSoC Idea]', and we'll add it for you. 3. Feel free to talk about GSoC on other project mailing lists. 4. Engage with students who express an interest in a project that might interest you. Students The student application period will be from the 10th to 21st of March. From now through then, you should research your project, get know members, and engage the community. Posting your project ideas to this mailing list is a great way to achieve the last two. Remember that having a good rapport with your mentors and the community is one of the most important criteria for being selected as a GSoC student. As far as project ideas go, check out the project ideas page [4], but don't feel restricted to that. You can do any project so long as you can find a suitable mentor, and it both involves Clojure programming and has a reasonable scope. I hope this helps. Thanks for helping out with Clojure's GSoC effort. Sincerely, Daniel [1]: http://dev.clojure.org/display/community/Google+Summer+of+Code+2014#GoogleSummerofCode2014-Gettinginvolved [2]: https://www.google-melange.com/gsoc/document/show/gsoc_program/google/gsoc2014/help_page#3._What_can_I_do_to_spread_the_word [3]: https://www.google-melange.com/gsoc/homepage/google/gsoc2014 [4]: http://dev.clojure.org/display/community/Project+Ideas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How to override the default port on 3000?
Try this. *lein ring server-headless pick-your-port ;; port 80 usually requires root permissions* Tim Washington Interruptsoftware.com http://interruptsoftware.com On Tue, Feb 25, 2014 at 9:21 AM, action actioncao2...@gmail.com wrote: I do like this: #lein new compojure-app guestbook #cd guestbook #lein ring server The server runs on port 3000 by default. But how to override the default port? Such as runs on port 80? thinks -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Image Resizer lib exception error
Hi Moritz and Michael, thanks for the pointer in the right direction. Almost there except for 1 point I think. The whole operation is made of 2 functions, one to upload/resize/save and the other to provide a unique filename by original filename + timestamp. (defn add-timestamp [filename] (let [ext-position (.lastIndexOf filename .) timestamp(tc/to-long (time/now))] (if (pos? ext-position) (str (.substring filename 0 ext-position) - timestamp (.substring filename ext-position)) (str filename - timestamp (defn update-profile2 [firstname lastname email file] (let [member-id (session/get :member-id) redirecturl (str /member/ member-id) originalfile (str (img-path) / (:filename file)) new-file-name (add-timestamp (:filename file)) photofile (str (img-path) / new-file-name)] (upload-file (img-path) *(update-in file [:filename] new-file-name))* (resize (file (with-open [rdr (clojure.java.io/reader photofile)])) 100 100) (memberdb/update-member member-id firstname lastname email (str new-file-name)) (resp/redirect redirecturl))) I checked output of new-file-name and photofile, they do provide the new file name alone or with full path. Where I'm still goofing up is applying new-file-name to the update-in function, prob cause its 6am :) Been at it too long, likely missing the obvious. If I can update the filename to *new-file-name*, the *with-open reader *should read the file so it can be resized. Pardeep. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Image Resizer lib exception error
Hi Moritz and Michael, thanks for the pointer in the right direction. Almost there except for 1 point I think. The whole operation is made of 2 functions, one to upload/resize/save and the other to provide a unique filename by original filename + timestamp. (defn add-timestamp [filename] (let [ext-position (.lastIndexOf filename .) timestamp(tc/to-long (time/now))] (if (pos? ext-position) (str (.substring filename 0 ext-position) - timestamp (.substring filename ext-position)) (str filename - timestamp (defn update-profile2 [firstname lastname email file] (let [member-id (session/get :member-id) redirecturl (str /member/ member-id) originalfile (str (img-path) / (:filename file)) *new-file-name* (add-timestamp (:filename file)) photofile (str (img-path) / new-file-name)] (upload-file (img-path) *(update-in *file [:filename] *new-file-name*)) --- this is where I'm stuck, changing the name of the uploaded file (resize (file (with-open [rdr (clojure.java.io/reader photofile)])) 100 100) (memberdb/update-member member-id firstname lastname email (str new-file-name)) (resp/redirect redirecturl))) I checked output of new-file-name and photofile, they do provide the new file name alone or with full path. Where I'm still goofing up is applying *new-file-name* to the *update-in*function, prob cause its now 6am :) If I can update the filename to *new-file-name *value, the *with-open*reader should read the file so it can be resized. Pardeep. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How to override the default port on 3000?
The lein-ring plugin accepts a port number as an argument: lein ring server 8080 Note, that in order to bind to port 80, you will need elevated (root) privileges. On Tue, Feb 25, 2014 at 9:21 AM, action actioncao2...@gmail.com wrote: I do like this: #lein new compojure-app guestbook #cd guestbook #lein ring server The server runs on port 3000 by default. But how to override the default port? Such as runs on port 80? thinks -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How to override the default port on 3000?
you can also change this line on your project.clj
:ring {:handler myproject.handler/app :port 8080}
Josh
On Tue, Feb 25, 2014 at 5:23 PM, Jason Stewart jstew...@fusionary.comwrote:
The lein-ring plugin accepts a port number as an argument:
lein ring server 8080
Note, that in order to bind to port 80, you will need elevated (root)
privileges.
On Tue, Feb 25, 2014 at 9:21 AM, action actioncao2...@gmail.com wrote:
I do like this:
#lein new compojure-app guestbook
#cd guestbook
#lein ring server
The server runs on port 3000 by default.
But how to override the default port?
Such as runs on port 80?
thinks
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Re: Help with data structures and dereferencing
Is there no way to simply structure the maps inside your main atom in
such a way that you can look up your entities?
{lhs-uuid1 {rhs-uuid1 [values] rhs-uuid2 [values]}}
(get-in @myatom [lhs-uuid1 rhs-uuid2])
You can wrap this in a function that does some other work to look it up
if need be, if the result of the above is nil (for example)...etc.
Seems like you're making things more complicated than they need to be
here, but it's hard to know without knowing more about your data.
But if I were you I would start there, as I've found thinking hard about
the structure of your data and and using the facilities provided by the
standard library usually helps simplify things tremendously.
(2014/02/25 23:14), Robert Quinn wrote:
new to clojure, in the process of unlearning years of OO. sorry for the
long post.
struggling with a design/impl and hoping to get some outside opinions so
I can understand my options (clojure better)
basic concepts are straightforward and in a nutshell I'm modeling
entities and relationships (aren't we all)
---
created a pool of entities (people and groups) implemented as maps.
each map has a :rels which is set of relationships to other entities.
the pool is an atom.
first approach; relationships are in the entity, add RHS entities into
the LHS :rels. the state of the RHS can change, I need the latest state
of RHS not as it was when the relationship was created. I decided not to
make each entity a ref (ref, atom, agent), it seemed too fine grained.
*thoughts?*
each entity has a uuid
second approach, a pool of relationships (:lhs uuid :rhs uuid :type x).
pool has all the relationships, also an atom. the pool has lots of
benefits it improves other parts of the code.
it doesn't solve the original problem, just moves it around, i still
can't put the actual RHS, so i'm using the uuid as a reference, i look
up RHS get the latest. (second guessing why didn't i make them atoms and
use @uuid).
now my relationships aren't embedded in my entity, that doesn't feel
right, anyone dealing with the entity should still be able to say...
(:rels entity) and get the relationships, so i add a function to :rels
that returns all the relationship based on the uuid of the LHS, this
works great. syntax changes and requires me to use ((:rels entity)).
*the problem is... (assumes everything within a single process)*
I want to pass this data structure around and now dereferencing is
bleeding out. Instead of passing around a data structure, I'm passing
around a data structure that has functions embedded in it. which seems
like a cool idea, but now the callee needs to know that :rels returns a
function, when it's supposed to have data in it. (which is the same
thing?) but I don't know how to treat it seamlessly. (i have not
considered eval).
for the :rels it's not too bad. doesn't feel like I'm using all the
power correctly, but it works.
*additional problem is, my rels look like this.*
(:lhs uuid :rhs uuid :type x)
:lhs and :rhs should be entities, not references. more functions? I
make :lhs and :rhs return functions which dereference entities. of
course that makes selecting from rel-pool much harder
that's when I knew I had to seek professional help (smile)
even with a long post hard to capture all the requirements...
1. the pools aren't supposed to be public so I can't have all the
callee functions understanding how to do the dereference.
2. the :rels function isn't one function, the truth is the rels-pool
doesn't have all relationships, some are virtual, the function
creates them on the fly, each entity could have it's own version of
get-relationships
any help is appreciated.
i've considered
* creating a function that denormalizes the data before sending it
out to. now its fully formed but i lose some recency (not much diff
i know)
* centralizing all the derefs functions - so the callee knows that all
the data isn't embedded but the functions don't live in structure,
just the uuids... that works well for LHS/RHS deref, but makes the
per entity virtual relationships much harder.
* rethinking my atom granularity and using @ but i don't think that
really helps
thanks for reading
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weird repl behavior
I am using the latest CIDER 0.6.0alpha (package: 20140224.735) (Clojure 1.5.1, nREPL 0.2.1) on Windows. I noticed suddenly my repl started to miss some println messages in my code. A simple test like this shows: (do (println hello) (println there)) hello It won't print the second message for some reason. Why is this happening? Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Help with data structures and dereferencing
David,
thanks for the reply. I started down that path.
RHS is an entity itself. Its state changes over time, with Identity
independent of its relationships, it can be related to many entities (LHS).
So its state has to live in one place or employ synchronization (complex
watchers?). I remember seeing a reference to zipper functionality that
seemed to imply a possible solution, I'll try to find that again..
Thanks,
Robert
On Tuesday, February 25, 2014 10:26:30 AM UTC-5, David Della Costa wrote:
Is there no way to simply structure the maps inside your main atom in
such a way that you can look up your entities?
{lhs-uuid1 {rhs-uuid1 [values] rhs-uuid2 [values]}}
(get-in @myatom [lhs-uuid1 rhs-uuid2])
You can wrap this in a function that does some other work to look it up
if need be, if the result of the above is nil (for example)...etc.
Seems like you're making things more complicated than they need to be
here, but it's hard to know without knowing more about your data.
But if I were you I would start there, as I've found thinking hard about
the structure of your data and and using the facilities provided by the
standard library usually helps simplify things tremendously.
(2014/02/25 23:14), Robert Quinn wrote:
new to clojure, in the process of unlearning years of OO. sorry for the
long post.
struggling with a design/impl and hoping to get some outside opinions so
I can understand my options (clojure better)
basic concepts are straightforward and in a nutshell I'm modeling
entities and relationships (aren't we all)
---
created a pool of entities (people and groups) implemented as maps.
each map has a :rels which is set of relationships to other entities.
the pool is an atom.
first approach; relationships are in the entity, add RHS entities into
the LHS :rels. the state of the RHS can change, I need the latest state
of RHS not as it was when the relationship was created. I decided not to
make each entity a ref (ref, atom, agent), it seemed too fine grained.
*thoughts?*
each entity has a uuid
second approach, a pool of relationships (:lhs uuid :rhs uuid :type x).
pool has all the relationships, also an atom. the pool has lots of
benefits it improves other parts of the code.
it doesn't solve the original problem, just moves it around, i still
can't put the actual RHS, so i'm using the uuid as a reference, i look
up RHS get the latest. (second guessing why didn't i make them atoms and
use @uuid).
now my relationships aren't embedded in my entity, that doesn't feel
right, anyone dealing with the entity should still be able to say...
(:rels entity) and get the relationships, so i add a function to :rels
that returns all the relationship based on the uuid of the LHS, this
works great. syntax changes and requires me to use ((:rels entity)).
*the problem is... (assumes everything within a single process)*
I want to pass this data structure around and now dereferencing is
bleeding out. Instead of passing around a data structure, I'm passing
around a data structure that has functions embedded in it. which seems
like a cool idea, but now the callee needs to know that :rels returns a
function, when it's supposed to have data in it. (which is the same
thing?) but I don't know how to treat it seamlessly. (i have not
considered eval).
for the :rels it's not too bad. doesn't feel like I'm using all the
power correctly, but it works.
*additional problem is, my rels look like this.*
(:lhs uuid :rhs uuid :type x)
:lhs and :rhs should be entities, not references. more functions? I
make :lhs and :rhs return functions which dereference entities. of
course that makes selecting from rel-pool much harder
that's when I knew I had to seek professional help (smile)
even with a long post hard to capture all the requirements...
1. the pools aren't supposed to be public so I can't have all the
callee functions understanding how to do the dereference.
2. the :rels function isn't one function, the truth is the rels-pool
doesn't have all relationships, some are virtual, the function
creates them on the fly, each entity could have it's own version of
get-relationships
any help is appreciated.
i've considered
* creating a function that denormalizes the data before sending it
out to. now its fully formed but i lose some recency (not much diff
i know)
* centralizing all the derefs functions - so the callee knows that all
the data isn't embedded but the functions don't live in structure,
just the uuids... that works well for LHS/RHS deref, but makes the
per entity virtual relationships much harder.
* rethinking my atom granularity and using @ but i don't think that
really helps
Re: How to override the default port on 3000?
If you do want to use port 80, it's generally safer to use a reverse
proxy like nginx to listen on port 80 and forward to port 3000 - that
way your code doesn't need root privileges and is less of a security
headache.
On 25 February 2014 14:59, Josh Kamau joshnet2...@gmail.com wrote:
you can also change this line on your project.clj
:ring {:handler myproject.handler/app :port 8080}
Josh
On Tue, Feb 25, 2014 at 5:23 PM, Jason Stewart jstew...@fusionary.com
wrote:
The lein-ring plugin accepts a port number as an argument:
lein ring server 8080
Note, that in order to bind to port 80, you will need elevated (root)
privileges.
On Tue, Feb 25, 2014 at 9:21 AM, action actioncao2...@gmail.com wrote:
I do like this:
#lein new compojure-app guestbook
#cd guestbook
#lein ring server
The server runs on port 3000 by default.
But how to override the default port?
Such as runs on port 80?
thinks
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robert@merton.oxon.org
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Re: object identity
No, my question isn't is there a way to do this. I'm sure there are a
dozen ways to do it. My question is about a specific way of doing it. In
particular, if your solution does not involve calling (identical? ..), then
it's not what I'm asking about.
In om core there's a call to identical? under the :shouldComponentUpdate
key, which I suspect is what David was talking about in his blog posts
about avoiding deep compares via immutable data structures. My question is
about whether that has implications for how you write algorithms that
update state, and whether the semantics of update-in (or assoc, really)
that allow it to return the same object if the update would return an
identical object, are related to this mechanism, if these semantics are
documented, and if they depend on the data type being assoc'd.
On Monday, February 24, 2014 6:27:02 PM UTC-8, t x wrote:
Perhaps I mis-interpreted your question.
I thought the question asked was:
GIven:
* pure function func
* some object obj
* (def a (func obj))
* (def b (func obj))
Example:
* obj = [1 2 3]
* (defn func [lst] (map #(* 2 %) lst))
Then:
* is there a O(1) way to check if (= a b) ?
In the above, we create two _different_ lists, both of which stores
[2 4 6], thus they're equal, but not identical
Proposed solution:
tag the returned-value with a meta object, where the meta object
describes how the object was computed.
in this case, both [2 4 6] would have _identical_ meta objects,
since they're both from the list [1 2 3]
On Mon, Feb 24, 2014 at 5:56 PM, Brian Craft
craft...@gmail.comjavascript:
wrote:
You're solving a similar problem, but I'm asking specifically about
using
object identity, not equality, for tracking changes in a nested
structure.
On Monday, February 24, 2014 1:42:03 PM UTC-8, t x wrote:
I finally have a chance to give back. :-)
I hacked up a newb's half-React. It does tree diffing + dom updating,
but not the virtual event handling system.
I ran into this exact problem, and solved it as follows:
## problem definition:
render: data - dom
tree-diff: dom * dom - list of dom-update-actions
we want to avoid deep tree diffing on tree-diff
the key idea is as follows:
when render is called twice with same args,
* we still have to recompute every time
* we don't have to re-compare every time
if render is a pure function, we do somethign like:
(defn render [data]
(with-meta (render-pure data) {:pure data}))
(render-pure data) gives us a dom-tree
we tag it with a meta project, telling us that it came from data,
and that it was a pure function
then, doing the tree-diff stage, we do:
(defn tree-diff [old-dom new-dom]
(let [mo (meta old-dom)
no (meta new-dom)]
(if (and (:pure mo) (:pure no) (= (:pure mo) (:pure no)))
.. ah, they're from the same pure function, thus the same ...
... okay, let's do expensive deep diff)))
so basically, we abuse meta objects, record
* what data gave us this dom tree ?
* was the func that gave us the dom tree pure ?
And if so, we just do a equality check on the data -- which are are
_not_ regenerating and thus matches an equality check.
Please let me if:
(a) this resolves the issue
(b) I completely misunderstood the question
Thanks!
On Mon, Feb 24, 2014 at 1:00 PM, Brian Craft craft...@gmail.com
wrote:
This is vaguely related to David's posts about om/react, where he
talks
about optimizing state change tracking by checking object identity on
immutable objects: deep compares can be avoided if same identity
implies
no
changes.
My first thought was that there are many algorithms that will give
you a
new
object every time, even if nothing has changed. E.g. if your state
has
an
array whose elements must be validated, doing a map over the elements
will
give you a new array every time, even if it makes no changes.
Enforcing non-negative values, for instance:
= (let [x {:a [1 -2 3]}] (update-in x [:a] (fn [y] (mapv #(if ( %
0) 0
%)
y
{:a [1 0 3]}
In the following case the values are already non-negative, but we
still
get
a new object:
= (let [x {:a [1 2 3]}] (identical? x (update-in x [:a] (fn [y]
(mapv
#(if
( % 0) 0 %) y)
false
One can imagine trying to rewrite this so it passes through the
vector
if
nothing has changed. E.g.
= (let [x {:a [1 2 3]}] (identical? x (update-in x [:a] (fn [y]
(reduce
(fn
[v i] (if ( (v i) 0) (assoc v i 0) v)) y (range (count y)))
true
= (let [x {:a [1 -1 3]}] (identical? x (update-in x [:a] (fn [y]
(reduce
(fn [v i] (if ( (v i) 0) (assoc v i 0) v)) y (range
Re: object identity
I don't really have anything to add to this thread but I will say that Om's
use of identical? is an implementation detail that's likely to change. =
already does an identical? check, ideally Om could use not= in the future
instead of (not (identical? ...)).
David
On Tue, Feb 25, 2014 at 12:54 PM, Brian Craft craft.br...@gmail.com wrote:
No, my question isn't is there a way to do this. I'm sure there are a
dozen ways to do it. My question is about a specific way of doing it. In
particular, if your solution does not involve calling (identical? ..), then
it's not what I'm asking about.
In om core there's a call to identical? under the :shouldComponentUpdate
key, which I suspect is what David was talking about in his blog posts
about avoiding deep compares via immutable data structures. My question is
about whether that has implications for how you write algorithms that
update state, and whether the semantics of update-in (or assoc, really)
that allow it to return the same object if the update would return an
identical object, are related to this mechanism, if these semantics are
documented, and if they depend on the data type being assoc'd.
On Monday, February 24, 2014 6:27:02 PM UTC-8, t x wrote:
Perhaps I mis-interpreted your question.
I thought the question asked was:
GIven:
* pure function func
* some object obj
* (def a (func obj))
* (def b (func obj))
Example:
* obj = [1 2 3]
* (defn func [lst] (map #(* 2 %) lst))
Then:
* is there a O(1) way to check if (= a b) ?
In the above, we create two _different_ lists, both of which stores
[2 4 6], thus they're equal, but not identical
Proposed solution:
tag the returned-value with a meta object, where the meta object
describes how the object was computed.
in this case, both [2 4 6] would have _identical_ meta objects,
since they're both from the list [1 2 3]
On Mon, Feb 24, 2014 at 5:56 PM, Brian Craft craft...@gmail.com wrote:
You're solving a similar problem, but I'm asking specifically about
using
object identity, not equality, for tracking changes in a nested
structure.
On Monday, February 24, 2014 1:42:03 PM UTC-8, t x wrote:
I finally have a chance to give back. :-)
I hacked up a newb's half-React. It does tree diffing + dom updating,
but not the virtual event handling system.
I ran into this exact problem, and solved it as follows:
## problem definition:
render: data - dom
tree-diff: dom * dom - list of dom-update-actions
we want to avoid deep tree diffing on tree-diff
the key idea is as follows:
when render is called twice with same args,
* we still have to recompute every time
* we don't have to re-compare every time
if render is a pure function, we do somethign like:
(defn render [data]
(with-meta (render-pure data) {:pure data}))
(render-pure data) gives us a dom-tree
we tag it with a meta project, telling us that it came from data,
and that it was a pure function
then, doing the tree-diff stage, we do:
(defn tree-diff [old-dom new-dom]
(let [mo (meta old-dom)
no (meta new-dom)]
(if (and (:pure mo) (:pure no) (= (:pure mo) (:pure no)))
.. ah, they're from the same pure function, thus the same ...
... okay, let's do expensive deep diff)))
so basically, we abuse meta objects, record
* what data gave us this dom tree ?
* was the func that gave us the dom tree pure ?
And if so, we just do a equality check on the data -- which are are
_not_ regenerating and thus matches an equality check.
Please let me if:
(a) this resolves the issue
(b) I completely misunderstood the question
Thanks!
On Mon, Feb 24, 2014 at 1:00 PM, Brian Craft craft...@gmail.com
wrote:
This is vaguely related to David's posts about om/react, where he
talks
about optimizing state change tracking by checking object identity
on
immutable objects: deep compares can be avoided if same identity
implies
no
changes.
My first thought was that there are many algorithms that will give
you a
new
object every time, even if nothing has changed. E.g. if your state
has
an
array whose elements must be validated, doing a map over the
elements
will
give you a new array every time, even if it makes no changes.
Enforcing non-negative values, for instance:
= (let [x {:a [1 -2 3]}] (update-in x [:a] (fn [y] (mapv #(if ( %
0) 0
%)
y
{:a [1 0 3]}
In the following case the values are already non-negative, but we
still
get
a new object:
= (let [x {:a [1 2 3]}] (identical? x (update-in x [:a] (fn [y]
(mapv
#(if
( % 0) 0 %) y)
false
One can imagine trying to rewrite this so it passes through the
vector
if
nothing has changed. E.g.
= (let [x {:a [1 2 3]}] (identical? x (update-in x [:a] (fn [y]
(reduce
(fn
[v i] (if ( (v i) 0)
[ANN] Claypoole: Threadpool Tools for Clojure
The Climate Corporation has open-sourced the library claypoolehttps://github.com/TheClimateCorporation/claypoole/, which is a set of threadpool tools for Clojure's parallel functions. For instance, you can start futures in a specific threadpool, pmap on a threadpool, or even use a parallel for (pfor). We find it to be a helpful way of controlling the degree of parallelism we're using. There is more information on our bloghttp://eng.climate.com/2014/02/25/claypoole-threadpool-tools-for-clojure/ . Feedback (and pull requests) are welcome. - Leon -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Can't start repl with Leiningen
On Sunday, February 23, 2014 4:32:54 PM UTC-5, Matej Fröbe wrote: Hello Clojure users! I have a problem with running *$lein repl* After some time I get: *REPL server launch timed out.* *$lein run myproject* works fine Leiningen and Java versions are: *$lein versionLeiningen 2.3.4 on Java 1.7.0_21 OpenJDK Client VM* I tried deleting stuff in ~/.lein but it doesn't help. Any suggestions how to solve this? Thanks, Matej Hi Matej, Have never seen this problem. You might try starting fresh by deleting your local repo (~/.m2) too, and re-downloading the `lein` script. -- John -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
avoiding reflection with gen-class
hey guys. i am struggling to understand how to avoid reflection when
calling a clojure method from java. i tried type hinting this in the
function definition, and that works assuming a version of the class exists
already, but if I do a clean compilation I get a
java.lang.ClassNotFoundException.
an approximation of the code is at http://pastebin.com/FpTyRNTS, also
pasted below:
(gen-class
:name com.company.Aclass
:prefix rad-
:extends org.eclipse.jetty.util.component.AbstractLifeCycle
:state state
:init init
:constructors {[java.util.Map] []}
:methods [[getStuff [] java.util.List]]
)
(defn ^java.util.List rad-getStuff
[^Aclass this]
(do
@(.state this)
))
thanks in advance!
Ilya
p.s. i am using clojure 1.5.1
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Re: Can't start repl with Leiningen
Hi John, Thank you for your answer. I have tried this already, but it doesn't help. Any other suggestions, how to find the cause of the problem? Matej Am Dienstag, 25. Februar 2014 19:51:51 UTC+1 schrieb John Gabriele: On Sunday, February 23, 2014 4:32:54 PM UTC-5, Matej Fröbe wrote: Hello Clojure users! I have a problem with running *$lein repl* After some time I get: *REPL server launch timed out.* *$lein run myproject* works fine Leiningen and Java versions are: *$lein versionLeiningen 2.3.4 on Java 1.7.0_21 OpenJDK Client VM* I tried deleting stuff in ~/.lein but it doesn't help. Any suggestions how to solve this? Thanks, Matej Hi Matej, Have never seen this problem. You might try starting fresh by deleting your local repo (~/.m2) too, and re-downloading the `lein` script. -- John -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Interested in GSOC
Hi everyone. I'm Rohan Prinja, a third year Computer Science undergrad at IIT Bombay http://iitb.ac.in. I love programming in Lisp-family languages and although I have only recently begun to use Clojure, I'm already quite familiar with Racket and Common Lisp. I also have a basic knowledge of the J programming language http://jsoftware.com. I am really interested in furthering my knowledge of Clojure while at the same time producing some meaningful contributions and in my opinion, contributing to open source via GSoC is the best way for me to do that! I went through the project ideas listhttp://dev.clojure.org/display/community/Project+Ideas and I feel that the Linear Algebra for Clojure project is the best one for me because I have a strong foundation in Linear Algebra. Please give me some suggestions on understanding and learning more about the project. So far I've seen the Enter the Matrixhttp://www.youtube.com/watch?v=_h9TLJtjSJo Clojure conj talk and have begun browsing the core.matrix sourcehttps://github.com/mikera/core.matrixon Github. What other things can I do? Thank you! Rohan Prinja https://github.com/wenderen -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Can't start repl with Leiningen
Matej, does this happen to you when you run lein repl outside of a project? If so, can you show us what your project.clj file looks like? I know for a fact that if you have :eval-in :trampoline in it, the repl will fail with that error. On Tuesday, February 25, 2014 2:56:04 PM UTC-5, Matej Fröbe wrote: Hi John, Thank you for your answer. I have tried this already, but it doesn't help. Any other suggestions, how to find the cause of the problem? Matej Am Dienstag, 25. Februar 2014 19:51:51 UTC+1 schrieb John Gabriele: On Sunday, February 23, 2014 4:32:54 PM UTC-5, Matej Fröbe wrote: Hello Clojure users! I have a problem with running *$lein repl* After some time I get: *REPL server launch timed out.* *$lein run myproject* works fine Leiningen and Java versions are: *$lein versionLeiningen 2.3.4 on Java 1.7.0_21 OpenJDK Client VM* I tried deleting stuff in ~/.lein but it doesn't help. Any suggestions how to solve this? Thanks, Matej Hi Matej, Have never seen this problem. You might try starting fresh by deleting your local repo (~/.m2) too, and re-downloading the `lein` script. -- John -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure code for detecting overlap of 3d shapes (specifically tetrahedra)?
On Feb 16, 2014, at 5:07 PM, Karsten Schmidt wrote: Yer welcome please do let me know how this works out for you! I've updated the gist[1] to delay more parts of the whole computation and replace most occurrences of `reduce` with `loop` - altogether leading to an almost 2x faster result for the worst case scenario where all test clauses are checked. K. [1] https://gist.github.com/postspectacular/9021724 Hi Karsten, I've noticed that intersect-tetrahedra? is sometimes asymmetric. Here's an example with randomly generated irregular tetrahedra, but I've noticed it for regular tetrahedra as well: (def t1 [[166 560 158] [889 160 1] [95 683 998] [445 779 516]]) (def t2 [[292 823 490] [868 167 651] [190 869 459] [208 591 753]]) (intersect-tetrahedra? t1 t2) = true (intersect-tetrahedra? t2 t1) = nil Do you have any idea why this might be or how it could be fixed? Thanks, -Lee -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Interested in GSOC
Hi, On Tue, Feb 25, 2014 at 8:59 PM, Rohan Prinja rohan.pri...@gmail.com wrote: Hi everyone. I'm Rohan Prinja, a third year Computer Science undergrad at IIT Bombay. I love programming in Lisp-family languages and although I have only recently begun to use Clojure, I'm already quite familiar with Racket and Common Lisp. I also have a basic knowledge of the J programming language. I am really interested in furthering my knowledge of Clojure while at the same time producing some meaningful contributions and in my opinion, contributing to open source via GSoC is the best way for me to do that! I second you on that. I participated in GSoC last year on the project Algebraic Expressions and it was a very good experience and I definitly learned a lot by doing it. I went through the project ideas list and I feel that the Linear Algebra for Clojure project is the best one for me because I have a strong foundation in Linear Algebra. I would be very happy if you manage to work on this project. Having support for the linear algebra operations is a long standing issue in core.matrix. Also Mike did a fantastic job mentoring me last year ;) Please give me some suggestions on understanding and learning more about the project. So far I've seen the Enter the Matrix Clojure conj talk and have begun browsing the core.matrix source on Github. What other things can I do? I think it is good to contact Mike Anderson (mikera on this list) directly for your gsoc specific questions regarding this project idea and what you can do to prepare yourself for it. Here are some of my ideas of what you could do: You should learn how clojure protocols are working and figure out how the code flows in core.matrix. Also, watch the numerical clojure mailing list and get involved https://groups.google.com/forum/#!forum/numerical-clojure (There is currently an active discussion about a Data Set implementation of core.matrix which could be a good starting point) greetings Maik -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure code for detecting overlap of 3d shapes (specifically tetrahedra)?
Hah! What a classic mistake (not yours)! The bug fix is a single letter change in the last call to `check-faces-b`. The reference point to check against should be the 2nd point in tetra `q`. It currently uses the 1st point `qa`, whereas it should be `qb`. Thanks for testing! Also just updated the gist once more... I verified symmetric results of your test case and also compared once more with the C version. https://gist.github.com/postspectacular/9021724/revisions Hth! K. On 25 February 2014 20:21, Lee Spector lspec...@hampshire.edu wrote: On Feb 16, 2014, at 5:07 PM, Karsten Schmidt wrote: Yer welcome please do let me know how this works out for you! I've updated the gist[1] to delay more parts of the whole computation and replace most occurrences of `reduce` with `loop` - altogether leading to an almost 2x faster result for the worst case scenario where all test clauses are checked. K. [1] https://gist.github.com/postspectacular/9021724 Hi Karsten, I've noticed that intersect-tetrahedra? is sometimes asymmetric. Here's an example with randomly generated irregular tetrahedra, but I've noticed it for regular tetrahedra as well: (def t1 [[166 560 158] [889 160 1] [95 683 998] [445 779 516]]) (def t2 [[292 823 490] [868 167 651] [190 869 459] [208 591 753]]) (intersect-tetrahedra? t1 t2) = true (intersect-tetrahedra? t2 t1) = nil Do you have any idea why this might be or how it could be fixed? Thanks, -Lee -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Karsten Schmidt http://postspectacular.com | http://toxiclibs.org | http://toxi.co.uk -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[ANN] ttlcache, an improved (?) version of core.cache's TTLCache
Hi all, I've been looking at DNS caching recently, and based on that, have made some improvements on top of the TTLCache in core.cache which I think I'm ready to release - they're at https://github.com/rkday/ttlcache and https://clojars.org/uk.me.rkd.ttlcache. The main improvements are that you can specify a function to extract TTLs from the cached values (useful for DNS etc. where each record comes with its own TTL), and that I'm using a priority queue to make expiry faster when only a few items are expiring. In the best case (where no items expire and it's O(1) rather than O(N)), it seems to be 150-200x faster on a 5,000-item cache. I'd appreciate any feedback on whether people think this is a useful type of cache, how big a problem it is to be slower when expiring large numbers of items, and whether I've got the benchmarks and big-O analysis right or whether there's something simple I've missed. Thanks! Rob P.S. I don't think this is yet in a state where I can open a JIRA request and try and get some of the improvements back into core.cache - mainly because it's slower when expiring large numbers of keys from the cache at once. But that's definitely something I'd like to do in the future if I can speed that up, or if people feel that's an edge case. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
ANN Meltdown 1.0.0-beta5 is released
Meltdown [1] is a Clojure interface to Reactor [2], an asynchronous programming toolkit for the JVM. beta5 is a development release that primarily focuses on updating Reactor to 1.1.0.M1 and fixing issues. Release notes: http://blog.clojurewerkz.org/blog/2014/02/26/meltdown-1-dot-0-0-beta5-is-released/ 1. https://github.com/clojurewerkz/meltdown 2. http://spring.io/blog/2013/11/12/it-can-t-just-be-big-data-it-has-to-be-fast-data-reactor-1-0-goes-ga -- MK http://github.com/michaelklishin http://twitter.com/michaelklishin -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Latest web framework for clojure
Hi All, I have been reading clojure for sometime now. I am at a point where I want to learn a web framework. I see many options available for clojure where few are built upon others. So if I am to learn one, which framework does the community recommend? Thanks Aravindh.S -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Latest web framework for clojure
Maybe you could try compojure. On Wed, Feb 26, 2014 at 9:13 AM, Aravindh S aravi...@theintrospect.inwrote: Hi All, I have been reading clojure for sometime now. I am at a point where I want to learn a web framework. I see many options available for clojure where few are built upon others. So if I am to learn one, which framework does the community recommend? Thanks Aravindh.S -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Best Regards, Haosdent Huang -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Latest web framework for clojure
Luminus is a batteries-included leiningen project template that includes compojure and other things to get started. http://www.luminusweb.net/ On Tue, Feb 25, 2014 at 8:18 PM, haosdent haosd...@gmail.com wrote: Maybe you could try compojure. On Wed, Feb 26, 2014 at 9:13 AM, Aravindh S aravi...@theintrospect.inwrote: Hi All, I have been reading clojure for sometime now. I am at a point where I want to learn a web framework. I see many options available for clojure where few are built upon others. So if I am to learn one, which framework does the community recommend? Thanks Aravindh.S -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Best Regards, Haosdent Huang -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Help with data structures and dereferencing
You are saying a zipper may be a solution--so do you have a tree or
graph structure?
If your RHS value is something that changes over time but has an
identity independent of its relationship to other nodes, then retrieving
or constructing its value could simply be a function or set of
functions--or just a lookup in a table--once you have access to its key,
could it not?
At least based on your description, it seems like you are complicating
the design by conflating two different things: accessing the most recent
value of the RHS value and establishing ways to look up values based on
their node relationships.
(2014/02/26 1:35), Robert Quinn wrote:
David,
thanks for the reply. I started down that path.
RHS is an entity itself. Its state changes over time, with Identity
independent of its relationships, it can be related to many entities
(LHS). So its state has to live in one place or employ synchronization
(complex watchers?). I remember seeing a reference to zipper
functionality that seemed to imply a possible solution, I'll try to find
that again..
Thanks,
Robert
On Tuesday, February 25, 2014 10:26:30 AM UTC-5, David Della Costa wrote:
Is there no way to simply structure the maps inside your main atom in
such a way that you can look up your entities?
{lhs-uuid1 {rhs-uuid1 [values] rhs-uuid2 [values]}}
(get-in @myatom [lhs-uuid1 rhs-uuid2])
You can wrap this in a function that does some other work to look it up
if need be, if the result of the above is nil (for example)...etc.
Seems like you're making things more complicated than they need to be
here, but it's hard to know without knowing more about your data.
But if I were you I would start there, as I've found thinking hard
about
the structure of your data and and using the facilities provided by the
standard library usually helps simplify things tremendously.
(2014/02/25 23:14), Robert Quinn wrote:
new to clojure, in the process of unlearning years of OO. sorry
for the
long post.
struggling with a design/impl and hoping to get some outside
opinions so
I can understand my options (clojure better)
basic concepts are straightforward and in a nutshell I'm modeling
entities and relationships (aren't we all)
---
created a pool of entities (people and groups) implemented as maps.
each map has a :rels which is set of relationships to other
entities.
the pool is an atom.
first approach; relationships are in the entity, add RHS entities
into
the LHS :rels. the state of the RHS can change, I need the latest
state
of RHS not as it was when the relationship was created. I decided
not to
make each entity a ref (ref, atom, agent), it seemed too fine
grained.
*thoughts?*
each entity has a uuid
second approach, a pool of relationships (:lhs uuid :rhs uuid
:type x).
pool has all the relationships, also an atom. the pool has lots of
benefits it improves other parts of the code.
it doesn't solve the original problem, just moves it around, i still
can't put the actual RHS, so i'm using the uuid as a reference, i
look
up RHS get the latest. (second guessing why didn't i make them
atoms and
use @uuid).
now my relationships aren't embedded in my entity, that doesn't feel
right, anyone dealing with the entity should still be able to say...
(:rels entity) and get the relationships, so i add a function to
:rels
that returns all the relationship based on the uuid of the LHS, this
works great. syntax changes and requires me to use ((:rels entity)).
*the problem is... (assumes everything within a single process)*
I want to pass this data structure around and now dereferencing is
bleeding out. Instead of passing around a data structure, I'm
passing
around a data structure that has functions embedded in it. which
seems
like a cool idea, but now the callee needs to know that :rels
returns a
function, when it's supposed to have data in it. (which is the same
thing?) but I don't know how to treat it seamlessly. (i have not
considered eval).
for the :rels it's not too bad. doesn't feel like I'm using all the
power correctly, but it works.
*additional problem is, my rels look like this.*
(:lhs uuid :rhs uuid :type x)
:lhs and :rhs should be entities, not references. more
functions? I
make :lhs and :rhs return functions which dereference entities. of
course that makes selecting from rel-pool much harder
that's when I knew I had to seek professional help (smile)
even with a long post hard to capture all the requirements...
Re: Latest web framework for clojure
On 02/26/2014 09:13 AM, Aravindh S wrote: Hi All, I have been reading clojure for sometime now. I am at a point where I want to learn a web framework. I see many options available for clojure where few are built upon others. So if I am to learn one, which framework does the community recommend? Thanks Aravindh.S I recommend Luminus (www.luminusweb.net), which is an opinionated mix of popular clojure libraries. I also wrote a post as a kind of overview of the various Clojure web components (https://hackworth.be/2013/12/10/navigating-clojure-web-stack/). That was written back when I'd first started with Clojure and trying to understand how all the pieces fit together, compared to my experiences with Ruby. Hope that helps, JPH -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: clojure.java.shell/sh and expand wildcard
On Tuesday, January 21, 2014 11:05:13 PM UTC-5, Michael Gardner wrote: Try (sh “bash” “-c” “ls *.txt”). Sorry for the belated reply, Michael. Thanks so much for the help; works! -- John -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Image Resizer lib exception error
I got the file naming fixed with: (upload-file (img-path) (assoc-in file [:filename] new-file-name)) The last part is reading in the uploaded file so it can be resized with Image Resizer. I wrote the code as: (with-open [rdr (clojure.java.io/reader (str (img-path) / new-file-name))]) As a test on an existing pic, if I put the wrong file path or file name, sure enough it shows the error of either not existing. If I put the correct path and file name, I get a null exception. Is my syntax correct or off. Going back to clojure docs to look again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Latest web framework for clojure
I would also recommend Luminus as a user friendly start you can generate a new project with Selmer for views (Django style), authentication, migrations and db persistence out the gate with either mysql, postgres, mongo (or H2 as default if you select neither) and Korma as db dsl. It will give you good understanding of how the moving parts work together and the docs are really good. http://www.luminusweb.net/docs/profiles.md - to see how to create a project with the tools you want To generate a site with postgres for example: lein new luminus myapp +site +postgres Then to fire up the app server: lein ring server And you'll see the project in your browser to start experimenting with the plumbing. The home page will instruct you how to run the migrations as your first step. I found it to be an excellent entry to Clojure web dev, mixing in and trying different libraries. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Why is Clojure faster than Java at this task?
Ah, that explanation makes sense, thank you. I imagine it would be quite cumbersome to do the same thing in Java, due to the lack of dynamic typing. On Tuesday, 25 February 2014 21:20:46 UTC+8, Rob Day wrote: It looks like an improvement in clojure.lang.BigInt over java.math.BigInteger - BigInt's add() method seems to do a long + long add if it doesn't overflow ( https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/BigInt.java#L142) and only fall back to BigInteger's add method (which has no such optimisation - http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/math/BigInteger.java#BigInteger.add%28java.math.BigInteger%29) if the overhead of BigInteger is actually needed. If you use clojure.lang.BigInt in your Java code, I suspect Java will be faster. On 25 February 2014 10:38, Jonathan Barnard jonathan@gmail.com javascript: wrote: I recently did a benchmark (admittedly in hindsight not a particularly good one) that involved comparison of an implementation of the same small program in Java and in Clojure, in which most of the time is spent in bignum operations. The results are at this link (the tables at the top; ignore the rest). The Clojure implementation appears to consistently perform better than the Java implementation (at least on this setup, x86-64 Linux with OpenJDK 1.7.0_25). I'd be interested to learn what Clojure does to make it perform faster than Java in this case, so I thought here might be a good place to ask. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- Robert K. Day rober...@merton.oxon.org javascript: -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [GSoC]: How to participate
Very helpful advice. Thank you very much. On Tue, Feb 25, 2014 at 10:25 PM, Daniel Solano Gómez d...@sattvik.comwrote: Hello, all, There were a number of questions about how to participate in Clojure's Google Summer of Code effort in my last GSoC post, enough that I felt it warranted its own thread. There is a section on the wiki about getting involved [1], but I'll make a few suggestions here. Everyone Please talk about GSoC at your Clojure user group meetings. If you happen to work at a university, the GSoC team has some materials available [2] if you are interested in putting on a promotional event. Mentors === If you are interested in being a mentor, even as a secondary/backup mentor, there are a few things you can do: 1. Sign up to be a mentor on Melange [3]. You will need to sign in with a Google account, create a profile, and request a connection with Clojure. 2. If you have any ideas that are not on our Project Ideas page [4], please add them. If you don't have write access to the wiki, feel free to post them to this mailing list with '[GSoC Idea]', and we'll add it for you. 3. Feel free to talk about GSoC on other project mailing lists. 4. Engage with students who express an interest in a project that might interest you. Students The student application period will be from the 10th to 21st of March. From now through then, you should research your project, get know members, and engage the community. Posting your project ideas to this mailing list is a great way to achieve the last two. Remember that having a good rapport with your mentors and the community is one of the most important criteria for being selected as a GSoC student. As far as project ideas go, check out the project ideas page [4], but don't feel restricted to that. You can do any project so long as you can find a suitable mentor, and it both involves Clojure programming and has a reasonable scope. I hope this helps. Thanks for helping out with Clojure's GSoC effort. Sincerely, Daniel [1]: http://dev.clojure.org/display/community/Google+Summer+of+Code+2014#GoogleSummerofCode2014-Gettinginvolved [2]: https://www.google-melange.com/gsoc/document/show/gsoc_program/google/gsoc2014/help_page#3._What_can_I_do_to_spread_the_word [3]: https://www.google-melange.com/gsoc/homepage/google/gsoc2014 [4]: http://dev.clojure.org/display/community/Project+Ideas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Best Regards, Haosdent Huang -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Latest web framework for clojure
It depends also on your requirements. For example if you want your app to work in many deployment scenarios (standalone Jetty or Tomcat, J2EE web containers...) and you may have to use servlet 3.0 API asynchronous features, nothing beats pedestal currently. The concept of interceptors is little harder to grok then simple ring handlers (which are reused to the greatest possible extent anyway), but they really make sense and truly decomplect execution order, unlike traditional ring wrapping handlers. The routing systems is also more transparent (data based) then Compojure macro routing and the url generation facility is nice. Sometimes i hear people say that pedestal is unclojurish and complex, but i think they just don't get the difference between complex and easy. Overall, i think that pedestal represents core clojure philosophy better then any other clojure server side framework. Dňa streda, 26. februára 2014 2:13:30 UTC+1 Aravindh S napísal(-a): Hi All, I have been reading clojure for sometime now. I am at a point where I want to learn a web framework. I see many options available for clojure where few are built upon others. So if I am to learn one, which framework does the community recommend? Thanks Aravindh.S -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
