As much as I like Clojure and atoms, I do not think they are a good fit for
caching. Not only is it impossible to address the concurrency issues
related to multiple threads loading the same object, but you also have to
do expiration and size management yourself. Immutability doesn't help much
Hi Beau,
I've not used the STM stuff at all, but my understanding is that dosync is
intended for co-ordinated updates to refs, and has no effect on atoms. It's
really intended for co-ordinating updates to multiple refs rather than as a
synchronisation primitive on a single entity. I might be
Hi Marcus,
That's an interesting approach. My first reaction was that the update is
still not atomic, since you have:
(when-not (contains? @cache k)
(swap! cache assoc k (calc-value* k)))
Which I thought could cause different clients to see different values
depending on the race condition
Hi Thomas,
Normally I'd agree with you, but in my case it actually works quite well
since I don't need to expire or worry about sizing. This is for caching
objects on IntelliJ parse tree elements, and the element with its cached
values is thrown away every time the document is parsed, so these
Hey Colin,
That doesn't mean guava wouldn't be a nice solution here still. Just
.invalidateAll to purge it. Might even use softValues to let the gc decide
to remove some entries when running low on memory. Emulating a mutable
thing in clojure with an atom is not always better than using the
Indeed you're right, I was confused. The dosync call was a naive attempt to
avoid the CAS operation you were worried about earlier. I suppose another
option would be to use compare-and-set! with a lazy seq.
(compare-and-set! cache-atom (dissoc @cache-atom k) (assoc @cache-atom k
(lazy-seq
Hi all,
there's a new version of Gorilla REPL out :-) The headline feature is that
the autocomplete UI now shows the docs for the function you're typing/lets
you browse the docs. It's really handy! Autocomplete itself is also much
improved, courtesy of the compliment library.
This version
Ohh, and there are some new docs on how to use Gorilla alongside your
favourite editor/IDE:
http://gorilla-repl.org/editors.html
Jony
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Note
Started looking into Gorilla for use at work today. Even prior to this
release I was incredibly impressed. Amazing work everyone involved.
On Monday, September 1, 2014 9:12:49 PM UTC+10, Jony Hudson wrote:
Ohh, and there are some new docs on how to use Gorilla alongside your
favourite
vim-fireplace uses cider-nrepl (when available, otherwise it will fallback to
evaling inlined code) as well, so the Emacs rules should apply for it.
—
Cheers,
Bozhidar
On September 1, 2014 at 2:12:53 PM, Jony Hudson (jonyepsi...@gmail.com) wrote:
Ohh, and there are some new docs on how to use
On September 1, 2014 at 2:11:40 PM, Jony Hudson (jonyepsi...@gmail.com) wrote:
Hi all,
there's a new version of Gorilla REPL out :-) The headline feature is that the
autocomplete UI now shows the docs for the function you're typing/lets you
browse the docs. It's really handy! Autocomplete
On Monday, 1 September 2014 13:16:36 UTC+1, Bozhidar Batsov wrote:
Thanks! :-) You might also find the var-info middleware quite useful -
cider and fireplace use it for code navigation and enhanced documentation
(eldoc and a replacement for (doc something) that works for both
On inspecting the source for memoize, it would actually seem (to my eyes,
someone please correct me if I'm mistaken) to be using a similar approach
to what has been suggested earlier in the discussion, with the risk of
re-computing values at concurrent invocations with the same arguments. So
Hi,
Prone (http://clojars.org/prone - http://github.com/magnars/prone) is a new
middleware for Ring apps that replaces the default exception page with an
interactive page that presents the exception, stack trace and environment
data in a more easily understandable way. It can also debug
When writing lein plugins you have to think about if they should do work in
lein's vm or the project's vm. In this case, since you want to load
namespaces from the project, the work will need to be done in the project's
vm. This is where `leiningen.core.eval/eval-in-project` is used, to spin
up
Sorry, I overlooked that you already ruled out all IDeref instances.
On Sunday, August 31, 2014 10:21:39 PM UTC-4, Atamert Ölçgen wrote:
On Mon, Sep 1, 2014 at 1:52 AM, adrian...@mail.yu.edu javascript:
wrote:
If you don't want to wrap the object in an atom, you can also reify an
I'm not sure whether this would apply in your case, but have you considered
using a WeakHashMap instead of Clojure's metadata?
- James
On 31 August 2014 09:55, Atamert Ölçgen mu...@muhuk.com wrote:
Hi Francis,
On Sat, Aug 30, 2014 at 1:34 PM, Francis Avila franci...@gmail.com
wrote:
It
On Sep 1, 2014, at 7:15 AM, Beau Fabry imf...@gmail.com wrote:
Started looking into Gorilla for use at work today. Even prior to this
release I was incredibly impressed. Amazing work everyone involved.
inc
The new docs feature is a thing of beauty.
-Lee
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Hi Jony,
Is there a path for using Gorilla REPL from a maven or gradle project?
Thanks,
Stu
On Mon, Sep 1, 2014 at 7:11 AM, Jony Hudson jonyepsi...@gmail.com wrote:
Hi all,
there's a new version of Gorilla REPL out :-) The headline feature is
that the autocomplete UI now shows the docs
Yeah, will do. Core.async channels and transducers solve similar problems
today.
On Aug 31, 2014, at 2:36 PM, Andy Fingerhut andy.finger...@gmail.com
wrote:
Found it:
Don't worry about streams - they lost to chunked seqs. Any vestiges just
need to be removed. -- Rich
Hi, I want to design my own t-shirt, cup and maybe something else putting
on clojure logo and some words on zazzle.es web. On http://clojure.org/swag
page there is* Design your own custom tee shirt online at Zazzle. *
So, while it's not for commercial use is it legal to download a clojure
logo
Where do you see a Java error here ?
I see the Clojure implementation
reporting that you are
trying to apply a numeric operator
to a null/nil value :)
I agree the JVM stack traces are not nice
and polluted by all the frames which
may/may not be relevant.
The messages are not always as clear as
On Monday, September 1, 2014 6:58:59 AM UTC-5, lavokad l wrote:
Hi, I want to design my own t-shirt, cup and maybe something else putting
on clojure logo and some words on zazzle.es web. On
http://clojure.org/swag page there is* Design your own custom tee shirt
online at Zazzle. *
So,
Beau, Lee - thanks for the kind words - glad you're enjoying it!
Stu - I've no experience of running Clojure under either maven or gradle,
but my guess is that it won't work out-of-the-box yet. Currently, Gorilla
launches by using Leiningen to run its own server process in the classpath
of the
I believe you can replace:
(when-not (contains? @cache k)
(swap! cache assoc k (calc-value* k
with:
(swap! cache (fn [cache']
(if (contains? cache' k)
cache'
(assoc cache' k (calc-value* k)
Note: I haven't run this code
On Mon, Sep 1,
Hi Jony,
A feature allowing connection to an external nREPL server would be great,
and totally usable by anyone who can make a CLASSPATH. Having to install a
particular build system (whether gradle, lein, or maven) in order to use a
tool is a non-starter for 90% of the projects I am involved
I reckon if that worked, there would be no need for memoize anyway, but I
don't think swap! will allow for it. I'm far from an expert on swap! or
atoms, but several swap!s may be run simultaneously on a single atom (and
swap! may re-run the swapping function if the atom has been changed since
And now, answering part of my own question. It appears the following
almost just works from a maven project that references gorilla:
(require '[gorilla-repl.core :as gorilla])
(gorilla/run-gorilla-server {:port 8990})
The only problem is that gorilla's declaration of its own dependencies
It works inside of lein because lein adds REPL-y to the classpath of the
project, which adds clojure-complete. Cider used to be coupled to this
before we gutted it.
On Mon, Sep 1, 2014 at 4:56 PM, Stuart Halloway stuart.hallo...@gmail.com
wrote:
And now, answering part of my own question. It
Ahh, nice, yes that's a simple way to do it if you can manage to add the
code somewhere.
Regarding the dependencies - Leiningen adds both of the dependencies you
list. I did declare them explicitly at one point, but I recall having some
odd error, so I decided to take them back out rather than
Hi Jony,
I sent you a pull request. I believe adding those items is correct and
necessary for producing a usable JAR, and that the build works so long as
you have a recent version of leiningen.
Stu
On Mon, Sep 1, 2014 at 5:04 PM, Jony Hudson jonyepsi...@gmail.com wrote:
Ahh, nice, yes
Huh, I gave it some more thought - of course, the reason why memoize won't
help us here is that there is no synchronization between simultaneous
invocations with the same set of arguments. This is typically not a problem
if the underlying function is fast, but in our case it would be neat with
On 01/09/2014 17:50, Luc Prefontaine wrote:
Where do you see a Java error here ?
I see the Clojure implementation
reporting that you are
trying to apply a numeric operator
to a null/nil value :)
I agree the JVM stack traces are not nice
and polluted by all the frames which
may/may not be
Ah ! Emacs, an old friend that I should eventually revisit after 30 years...
Long time no see :)
Luc P.
On 01/09/2014 17:50, Luc Prefontaine wrote:
Where do you see a Java error here ?
I see the Clojure implementation
reporting that you are
trying to apply a numeric operator
to a
Forget about sleep, there's work to be done! I realized that the drawback I
mentioned with my solution, where concurrent calls to the memoized function
with different sets of arguments would be handled one-by-one, could easily
be resolved by having the cache inside synced-memoize store futures
The pretty-errors leiningen plugin might be worth a look
On Tuesday, September 2, 2014 7:58:31 AM UTC+10, g vim wrote:
On 01/09/2014 17:50, Luc Prefontaine wrote:
Where do you see a Java error here ?
I see the Clojure implementation
reporting that you are
trying to apply a
For what it's worth we're using Gorilla *after* leiningen. Leiningen is
used to make an uberjar, but then we start the gorilla server in our own
main. This is because we're running gorilla inside of our hadoop
environment. This way we have a gorilla instance that can issue live
cascalog
Looks like you figured this out, but sharing in case it helps others.
It turns out the JVM actually has a special caching mechanism for making
NullPointerExceptions fast (and near-impossible to debug):
http://stackoverflow.com/a/3010106
This link also has a JVM opt to stop this optimization,
I don't do any web dev myself, but Prone looks really nice -
congratulations! Great work.
Cheers,
Colin
On 2 September 2014 02:05, Christian Johansen christ...@cjohansen.no
wrote:
Hi,
Prone (http://clojars.org/prone - http://github.com/magnars/prone) is a
new middleware for Ring apps that
Just a little bit of showing off of the previous post
:-) http://i.imgur.com/zpfP9Ja.png
On Tuesday, September 2, 2014 9:36:50 AM UTC+10, Beau Fabry wrote:
For what it's worth we're using Gorilla *after* leiningen. Leiningen is
used to make an uberjar, but then we start the gorilla server in
Dear Clojure community,
clojure2minizinc provides an interface between state-of-the-art constraint
solvers (via MiniZinc) and Clojure. The clojure2minizinc user models in
Clojure constraint satisfaction or optimisation problems over Boolean,
integer, real number, and/or set variables.
This looks rather nice. I'll certainly be trying it out.
- James
On 2 September 2014 01:06, Colin Fleming colin.mailingl...@gmail.com
wrote:
I don't do any web dev myself, but Prone looks really nice -
congratulations! Great work.
Cheers,
Colin
On 2 September 2014 02:05, Christian
Awesome, thanks for the feedback. That all makes sense. And yes, the work
will be done in the project's VM.
I guess what I'm missing is something more basic. If you look at lein-midje
https://github.com/marick/lein-midje/blob/master/src/leiningen/midje.clj#L168
or lein-spec
Or (ignoring the previous) getting even more basic...
*$ tree*
.
|-- LICENSE
|-- pom.xml
|-- project.clj
|-- README.md
`-- src
`-- leiningen
`-- zzz.clj
*$ cat src/leiningen/zzz.clj *
(ns leiningen.zzz
(:require [leiningen.core.eval :refer [eval-in-project]]))
(defn zz []
Ok, I figured it out... :) Something in my *~/.lein/profiles.clj* was
screwing things up. It was one of the repl-options, because when I turned
those off, things just started to work. Hope this helps someone in future.
#_:repl-options #_{:nrepl-middleware
Outstanding work!
Just plugged it locally and used it to debug a particularly hairy issue on my
side. This is super useful.
-Kurt
On Mon, Sep 1, 2014 at 10:48 PM, James Reeves ja...@booleanknot.com
wrote:
This looks rather nice. I'll certainly be trying it out.
- James
On 2
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