On Thursday, August 27, 2015 at 1:15:14 AM UTC+2, red...@gmail.com wrote:
I have found the access control stuff in Java to be an incredible pain.
When attempting to compose a larger system from the parts. Generally
everything is compulsively private, so if an api doesn't exactly expose
I have a peculiar problem (due to being used in a scripting context)
related to in-ns.
I have a file that is executed in a namespace which is provided by the
scripting infrastructure (per invocation, i.e. I do not know the namespace
statically,it will be something like prefix.unknown-123).
When I refer to a namespace like this:
(require '[clojure.test.check :as tc])
using tc/whatever works as expected, but I have not found a way to use the
handle tc to refer to the namespace:
user= (the-ns 'tc)
Exception No namespace: tc found clojure.core/the-ns (core.clj:3933)
Using the
Is there a way to provide a default (fallback) implementation for a method
defined in a defprotocol directive? I do realize that I could extend the
protocol for type java.lang.Object, but this raises the question about how
protocol implementations with extend are sorted, i.e. how
On Friday, September 5, 2014 9:13:43 AM UTC+2, Andre Van Der Merwe wrote:
Alternatively are there any papers or examples that you know of that
discuss implementing statecharts? Most of the ones I’ve seen are code-gen
tools and that does not really what I am after.
You should definitely
Very nice; I also found your Clojure workflow article (
http://z.caudate.me/give-your-clojure-workflow-more-flow/) tremendously
useful.
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Is there a prebuilt binary JAR of core.async available somewhere? I did not
find it on Clojars.
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Hi,
I sometimes (in fact quite often) want to use the - macro like this:
(- {}
(assoc :a a)
(assoc :b (some-fn CTX)))
where CTX should be the current value of the threaded element. Currently,
I'm forced to write a helper function
(defn add-some-fn [ctx]
(assoc ctx :b (some-fn ctx)))
That looks like it can do the job; thanks!
On Tuesday, July 2, 2013 8:12:04 AM UTC+2, Meikel Brandmeyer (kotarak)
wrote:
Hi,
since 1.5 there is
as-http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/as-%3E
:
(as- {} ctx
(assoc ctx :a a)
(assoc ctx :b (some-fn
On Jan 25, 7:20 pm, Roman Roelofsen roman.roelof...@googlemail.com
wrote:
After playing around with clojureql I noticed how well the relational
data model maps to a functional language. Processing lists (result
sets), joining, filter, group by, etc. are ideas I found in both
worlds. I am
On Jan 18, 1:59 pm, Laurent PETIT laurent.pe...@gmail.com wrote:
There's a library in clojure.contrib which allows to create your own
getters / setters for maps :
http://richhickey.github.com/clojure-contrib/fnmap-api.html
Not wanting to interrupt this thread, but this is amazing! I could
On Dec 20, 7:22 pm, nathaniel nathan...@photino.org wrote:
Does anyone know of Clojure features
which rely on Java features that would be prohibitively difficult to
implement in C++?
You might run into the problem than any C++ garbage collector you find
will probably not be quite as efficient
On Dec 2, 4:51 pm, Dennis shr3ks...@gmail.com wrote:
The XML is of the form:
ganglia
multiple clusters
multiple hosts
multiple metrics
Use XPath. Seriously, I hate XML and XSLT, but XPath is simply the
most concise way to extract things from a nested structure. Most XPath-
On Nov 30, 11:07 pm, jim jim.d...@gmail.com wrote:
Just finished the tutorial explaining the continuation monad in
clojure. Haven't even proofed it but I want to head to the gym. :)
http://intensivesystems.net/tutorials/cont_m.html
This is great stuff; thanks!
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On Nov 26, 7:39 pm, Richard Newman holyg...@gmail.com wrote:
Re consistency: I seem to recall Pascal Costanza working on
activation of layers, so you can swap a whole set of stuff across your
program. He spoke about it at ILC2009, but I'm not sure I've found the
right paper. Common
On Nov 10, 7:07 am, David Brown cloj...@davidb.org wrote:
Ok. So, it's the existence of this future-like entity that blocks
upon deref until filled is indeed somewhat missing. It's not
particularly difficult to implement.
This thing could easily create a lazy sequence, in fact, the code
On Nov 9, 5:39 pm, David Brown cloj...@davidb.org wrote:
(let-map [x [31 41 59 26]
y (iterate inc 1)]
(+ x y))
Probably not that interesting in the simple case.
How is this different from using for? It's also lazy and supports
destructuring.
(for [x [31 41 59 26]
On Nov 9, 6:42 pm, David Brown cloj...@davidb.org wrote:
And gives very different results. 'for' iterates over it's sequences
in a nested fasion. For your particular example, it will return the
sequence from (+ 31 1) (+ 31 2) and so on, and never get to the second
element of the first
On Nov 8, 6:08 am, Adrian Cuthbertson adrian.cuthbert...@gmail.com
wrote:
Hmm, someone else has made another closure available :).
http://googlecode.blogspot.com/2009/11/introducing-closure-tools.html
There's also Clozure Common Lisp [1], which is conceptually closer to
Clojure.
[1]
On Nov 1, 8:47 pm, Teemu Antti-Poika antti...@gmail.com wrote:
I want to use my own exceptions to control program flow. I want to
catch my own exceptions and let the surrounding container worry about
other exceptions. In order to do this, I must catch my exceptions
selectively by type name,
On Oct 26, 8:12 pm, samppi rbysam...@gmail.com wrote:
According to the docs, the function passed into an add-watch call
receives four arguments. Its first argument is a key. This key seems
to be the same key as the key passed into the add-watch call, and so
would always be the same, for the
On Oct 18, 6:27 am, mbrodersen morten.broder...@gmail.com wrote:
I don't know SWT well enough to answer that. I am new to the JVM
platform (after 20+ years of writing native C++ code).
However, the question is not SWT specific. There will be other cases
(for example OpenGL) where something
Hi,
I've run into the issue that when declaring a multimethod using
defmulti, the dispatch-function has to be not only declared, but must
actually be defined.
I.e. the following does not work:
(declare my-dispatch-fn)
(defmulti my-multi my-dispatch-fn) ; throws exception due to unbound
Var
On Oct 18, 12:29 am, Stuart Sierra the.stuart.sie...@gmail.com
wrote:
I think this is intentional, because the multifn doesn't call the
dispatch function by name. Common usage is to use an anonymous fn for
the dispatch.
Ok, wrapping it in an anonymous function solves the problem; thanks!
In your article, you mention the problematic size of 1.4MB of
clojure.jar. You might want to try clojure-slim.jar, which gets built
alongside clojure.jar, and is about 500KB.
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On Oct 7, 10:50 am, Hans Sjunnesson hans.sjunnes...@gmail.com wrote:
The following code works fine:
(doseq [x (xml-seq foo)] (println x))
However when I want to do more things in the doseq body, or I simply
add an extra set of parentheses around the println statement, I get a
nullpointer.
IIRC, dispatching to agents (via send or send-off) during a dosync
only happens if the transaction was successful (this was discussed in
several places, though http://clojure.org/refs does not mention this;
maybe this should be included there, if this is really something that
is guaranteed).
I'd
You might want to look into the stuff from JSR166 (scheduled for Java
7, but already available as a library for Java 6), which has advanced,
built-in workload-balancing which is vastly easier than trying to do
this with the raw, naive j.u.c.Executors-package (and Clojure's
agents, which are
On Sep 21, 11:22 pm, sross ros...@gmail.com wrote:
I'm looking for a bit of advice for calling a java method which has a
few different signatures (such as Connection.prepareStatement).
Is there a cleaner way of passing a variable number of arguments to
the method, such as
(apply (memfn
Hi,
I'd like to know whether there is already something in clojure.contrib
that installs a method with multiple dispatch-values, i.e. given a
multimethod like:
(defmulti some-multi identity)
instead of installing several methods with different dispatch values
that do the same thing:
The idiomatic Clojure way of doing what you want is to define *one*
method against something higher up in the hierarchy than both :a and :b.
For example, if your two values are ::get and ::head, perhaps you
should be defining a handler for ::idempotent-http-method.
Thanks; fits
On Aug 1, 2:36 am, Niels Mayer nielsma...@gmail.com wrote:
PS: I've always seen xwiki as the emacs of webapps (and wikis)...
So I'm looking forward to having a real emacsish type language -- clojure
--
to extend it via a more appropriate language for scripting.
I'm the author of the JSR 223
I've also looked into the dynamic-map stuff, but found only
rudimentary documentation, which caused me to give up. It's nice to
see that you seem to have gotten further.
For me personally, well-polished defmodel/hbm-property functionality
would be much more important than a query-DSL (since you
On Jun 23, 12:30 am, Thibaut Barrère thibaut.barr...@gmail.com
wrote:
btw - if there is a better way to achieve this, I'm ready to learn :)
There's the main-proc in clojure.lang.Compile, which uses the system
property clojure.compile.path to define the output directory and
accepts a list of
On Jun 19, 12:52 pm, Tassilo Horn tass...@member.fsf.org wrote:
foo/bar/baz.clj
foo/bar/i1.png
foo/bar/i2.png
I tried (ClassLoader/getSystemResource i1.png), but that looks
somewhere in the clojure location, not my apps location...
The right thought, but you need to use the full
On Jun 19, 3:11 am, Justin jta...@gmail.com wrote:
Is clojure.contrib.* not included with clojure?
No; you need to get it from the git-repository at
http://github.com/richhickey/clojure-contrib and build it yourself
(and don't forget to include the built JAR in your classpath).
On Jun 19, 1:31 pm, Josip Gracin josip.gra...@gmail.com wrote:
Hi!
How do I dispatch on Java primitive array? I mean, my dispatch
function is 'class' and I'd like to add method for byte arrays.
A not very elegant way would be to simply use (class (make-array Byte/
TYPE 0)) as dispatch value,
I've noticed that clojure.lang.Namespace cannot be used with the name-
function (like (name *ns*)) because it does not implement
clojure.lang.Named. One has to use (.getName *ns*), which is a bit
ugly.
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On May 20, 4:47 am, Per nondual...@gmail.com wrote:
;; The macro
(defmacro def-fields [name tgs]
`(defstruct ~name ~@(map #(symbol (str : %)) tgs))
)
If you replace the call to 'symbol' with a call to 'keyword', it works
(I think this is what you intended).
On Mar 25, 11:35 pm, Raoul Duke rao...@gmail.com wrote:
if one doesn't have to convert the db into objects, then is there less
impedance mismatch? what is a nice setup in a functional language for
working with a db schema? what is your experience/thought?
Somewhat less, at least in my
On Mar 24, 12:01 am, Rowdy Rednose rowdy.redn...@gmx.net wrote:
Hi group,
say I have 2 sequences
(def seq-a '(a1 a2 a3))
(def seq-b '(b1 b2 b3))
and want to iterate over them in parallel, like this
(par-doseq [a seq-a b seq-b] (prn a b))
which should print
a1 b1
a2 b2
a3 b3
A
On Mar 22, 5:10 pm, Stuart Sierra the.stuart.sie...@gmail.com wrote:
On Mar 21, 4:38 pm, CuppoJava patrickli_2...@hotmail.com wrote:
For proxies, I haven't figured out a way yet.
Proxies cannot call superclass methods. Classes generated with gen-
class can. However, if you regularly need
On Mar 14, 1:08 pm, Meikel Brandmeyer m...@kotka.de wrote:
I remember some presentation of someone doing this for,
I think, Python. There you hint things, where the type is
known and the compiler inferred the rest as far as possible.
What cannot be inferred was cast to a special type called
On Mar 14, 12:44 pm, Rock rocco.ro...@gmail.com wrote:
Hi all. I've been working on a piece of code (an xml-rpc server) in
Python (actually Jython), and one of its features is the capability of
loading modules (connectors in Java) during runtime. Not only are
these modules dynamically loaded
On Mar 14, 5:06 pm, Rock rocco.ro...@gmail.com wrote:
proxy = __import__(name) # where name is a string
proxy.doOperation(*args)
After leaving the method where the above two lines of code are
located, the module stored in proxy is no longer accessible, and the
resources are released.
On Mar 13, 1:19 pm, Eric Thorsen ethor...@enclojure.org wrote:
I come across some functions in clojure/core that are really useful in
tool building but often are private.
Is it possible to make these public?
I'm using the following hack to access private functions (for example
generate-class
On Mar 11, 4:41 am, Allen Rohner aroh...@gmail.com wrote:
Replying to my own question because I figured it out. On the profiler
tab, before you hit start profiling, click the settings checkbox.
Edit the start from class field. Mine was set to jline.**. After
changing it to the appropriate
On Mar 11, 4:23 pm, quasar quasistellarli...@gmail.com wrote:
It seems it makes Clojure source code to be in the order of lowest-to-
highest abstraction.
Naive mutual recursion based on top-level functions is impossible.
I am curious, is it due to the current implementaiton of Reader or by
Without dedicated classloaders, temporary (dynamically created)
classes would leak (since there is no way to unload a class without
letting its classloader be garbage collected). This might or might not
be the reason why Clojure uses many classloaders.
Hi,
is there a way to attach metadata (especially a docstring) to
namespaces? The Namespace-class implements (via AReference -
IReference - IMeta) the IMeta-interface, but the obvious way of using
the reader-macro to attach metadata does not work and I don't know any
other way.
I.e. I would
On Mar 4, 11:31 pm, Meikel Brandmeyer m...@kotka.de wrote:
(ns foo.bar
docstring goes here
...)
Thanks a lot, this works for me. (Perhaps this should be mentioned in
the documentation of the ns-form.)
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On Feb 26, 5:11 pm, Peter Wolf opus...@gmail.com wrote:
What is the idiomatic way to concatenate strings? Here are some things
that I expected to work, but didn't
(+ foo bah)
(conj foo bah)
(into foo bah)
For the moment I am doing
(.concat foo bah)
(str foo bah)
On Feb 26, 1:05 am, Mark Derricutt m...@talios.com wrote:
Personally I'd probably find adding annotations at the method level more
useful than at the gen-class level. Although both would certainly be handy.
Some examples I'm thinking of would be adding say the spring @Component
annotation
Some (most, if not all) CL variants have a *features*-var available
that contains information about what the implementation supports and
what not. Seeing that the issue of determining the Clojure-version in
use come up from time to time, maybe it would be useful to introduce
something like this
(defn my-watcher-action [current-value reference]
(let [change-count-map current-value
old-count (change-count-map reference)
new-count (if old-count (inc old-count) 1)]
(assoc change-count-map reference new-count)))
It seems to me that your problem is that you are not
On Feb 23, 1:55 am, pmf phil.fr...@gmx.de wrote:
(defn my-watcher-action [current-value reference]
(let [change-count-map current-value
old-count (change-count-map reference)
new-count (if old-count (inc old-count) 1)]
(assoc change-count-map reference new-count
On Feb 21, 8:31 am, Richard Lyman richard.ly...@gmail.com wrote:
I have an instance of the Java class in a variable.
I have the method arguments in a vector.
I have the method name as a String.
I've tried so many different ways to invoke that method on that class and
pass those parameters.
On Feb 20, 11:40 am, Rowdy Rednose rowdy.redn...@gmx.net wrote:
Any elegant ideas or examples on how to do this when the underlying
data structure is (a ref to) one of clojure's (immutable) collections,
so that a change to that structure will fire the appropriate event?
You can use
Ok,here's a small example that propagates changes to a ref's vector to
a watcher:
;; define your model
(def model (ref [abc def ghi]))
;; define a watcher
(def model-watcher (agent nil))
;; connect your model to the watcher
(add-watcher model :send model-watcher (fn [state source] (println
On Jan 1, 10:19 pm, CuppoJava patrickli_2...@hotmail.com wrote:
Hi,
For some reason the Classname/staticField macro is not working
properly for me.
graphics= (AudioSystem/getSystem)
#OpenALSystem com.jmex.audio.openal.openalsys...@ec6b00
graphics= AudioSystem/getSystem
On Dec 30, 10:29 pm, falcon shahb...@gmail.com wrote:
(doc fn) gives me a description of the function, and information about
function arity. I assumed the description and arity were part of
metadata but (meta fn) only returns nil (for a few functions I tried).
Be sure to var-quote the
On Dec 30, 11:08 pm, falcon shahb...@gmail.com wrote:
Impressive, source file and line numbers are already included!
I need to better understand reader macro (or where ever # comes from).
You actually need to know two things regarding this issue.
In function-definitions, the meta-data is
On Nov 30, 10:00 am, puzzler [EMAIL PROTECTED] wrote:
subvec is O(1) because it takes advantage of sharing. This is quite
useful.
Is there a way to write concatvec in an O(1) way, taking advantage of
sharing?
I suspect that the obvious way to concatenate vectors, i.e., (into
[] (concat v1
On Nov 30, 11:04 am, Adrian Cuthbertson
[EMAIL PROTECTED] wrote:
Hmm, I tried your dirs and files off my dev directory and the same
binding/compile form and it works fine or me - firstly on 1121, but then I
checked out 1130 and also no problem. (I'm on jdk 1.5 on OSX). Sure you've
created the
On Nov 21, 10:20 pm, Craig McDaniel [EMAIL PROTECTED] wrote:
I can compile and run the example, but it doesn't work with the /
syntax for main, even though main is a static method:
user (my.hello/main (into-array [Bizarro]))
java.lang.Exception: No such var: my.hello/main
The function is
On Nov 19, 5:51 pm, prhlava [EMAIL PROTECTED] wrote:
(. ofile write (str
(char (bit-shift-right pix 16))
(char (bit-shift-right pix 8))
(char pix)))
Hi,
as briefly mentioned on IRC, I've uploaded a patch to the files-
section of
the group (http://clojure.googlegroups.com/web/genclass-exposes-
fix.patch)
that fixes the behaviour of gen-class when a field to be exposed via
:exposes is not declared in the immediate superclass, but somewhere in
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