Re: top-level lets or private globals

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 >

Remember old namespace when using in-ns

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"). Th

Referencing aliased namespace

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 full

Default implementation for defprotocol

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 specializations

Re: Clojure statechart / hierarchical FSM implementation

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 definite

Re: ANN: [vinyasa 0.1.5] - dynamic reloading of java code without repl restart

Very nice; I also found your Clojure workflow article ( http://z.caudate.me/give-your-clojure-workflow-more-flow/) tremendously useful. -- -- 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

core.async JAR

Is there a prebuilt binary JAR of core.async available somewhere? I did not find it on Clojars. -- -- 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 mod

Re: -> macro and accessing context

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-> > : > > (as-> {} ctx > (assoc ctx :a "a") > (assoc ctx :b

-> macro and accessing context

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)))

Re: Domain Modelling

On Jan 25, 7:20 pm, Roman Roelofsen 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 currently working on a toy proje

Re: Case-insensitive map?

On Jan 18, 1:59 pm, Laurent PETIT 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 have used this a dozen

Re: Clojure and c++ and a bit more

On Dec 20, 7:22 pm, nathaniel 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 as the JVM's garbag

Re: Handling XML

On Dec 2, 4:51 pm, Dennis 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- libraries allow for p

Re: Continuation monad tutorial

On Nov 30, 11:07 pm, jim 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! -- You received this message because you are

Re: Atomic reloads and snapshots of namespaces

On Nov 26, 7:39 pm, Richard Newman 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 Lisp-specific, thou

Re: Using agents and blocking I/O.

On Nov 10, 7:07 am, David Brown 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 > would look a lo

Re: Iterative collections.

On Nov 9, 6:42 pm, David Brown 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 vector. > > 'let-map

Re: Iterative collections.

On Nov 9, 5:39 pm, David Brown 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] y (iterate

Re: Another "closure" available

On Nov 8, 6:08 am, Adrian Cuthbertson 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] http://www.clozure.com/clozurec

Re: Creating custom exceptions in clojure & gen--class use?

On Nov 1, 8:47 pm, Teemu Antti-Poika 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, say FooException

Re: add-watch's functions' first argument

On Oct 26, 8:12 pm, samppi 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 same ref and fu

Re: Dedicated thread for agent or creating thread pool for agent?

On Oct 18, 6:27 am, mbrodersen 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 like InvokeLater doesn'

Re: Multimethods and dispatch function

On Oct 18, 12:29 am, Stuart Sierra 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! --~--~-~--~~

Multimethods and dispatch function

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 (d

Re: Clojure Applets: Tutorial

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. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Gr

swap! and dosync

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

Re: Strange nullpointer when seqing through an xml

On Oct 7, 10:50 am, Hans Sjunnesson 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. > (doseq [x (xml-seq

Re: Adding meta data to string?

On Oct 3, 9:17 am, Jung Ko wrote: > Is it possible to add meta-data to Strings? > > (with-meta "Hello" {:key 123}) > > java.lang.String cannot be cast to clojure.lang.IObj >   [Thrown class java.lang.ClassCastException] And String is final, making deriving from it impossible. One way (most prob

Re: Architecting a large multi-threaded process

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 backed

Re: Applying Java methods.

On Sep 21, 11:22 pm, sross 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 prepareStatem

Re: How to define multiple methods at once

> 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 perf

How to define multiple methods at once

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: (defmethod

Re: JSR 223

On Aug 1, 2:36 am, Niels Mayer 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 bridge for Cloj

Re: proxy'ing a final class

On Jul 26, 1:22 pm, Steffen Glückselig wrote: > Hello, > > I was going to extend java.util.regex.Matcher for named groups and > came to a point where I wanted to proxy the Matcher-class so that my > extension was usable in-place of the original implementation. > > I realized - via "java.lang.Veri

Re: Approaching Clojure-Hibernate integration using hibernate.default_entity_mode = dynamic-map (Feedback Request)

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 p

Re: Compiling from command line (solved)

On Jun 23, 12:30 am, Thibaut Barrère 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 libs to compile. (I don't kn

Re: How to use primitive array as dispatch value?

On Jun 19, 1:31 pm, Josip Gracin 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, as in the followin

Re: clojure.contrib.*

On Jun 19, 3:11 am, Justin 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). --~--~-~--~~

Re: Loading ImageIcons from clojure code

On Jun 19, 12:52 pm, Tassilo Horn 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 relative path to th

Shouldn't c.l.Namespace implement c.l.Named?

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. --~--~-~--~~~---~--~~ You received this message because you are

Re: macro issue

On May 20, 4:47 am, Per 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). --~--~-~--~~~---~-

Re: O-R mapping

On Mar 25, 11:35 pm, Raoul Duke 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 experience. In FP, yo

Re: parallel iteration

On Mar 24, 12:01 am, Rowdy Rednose 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"

Re: What's a convenient way of calling super.method()?

On Mar 22, 5:10 pm, Stuart Sierra wrote: > On Mar 21, 4:38 pm, CuppoJava 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 to call superclass methods > instead of subcla

Re: Dynamic loading of code (a la Python)?

On Mar 14, 5:06 pm, Rock 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. That's cool becaus

Re: Dynamic loading of code (a la Python)?

On Mar 14, 12:44 pm, Rock 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 request (their

Re: Promise for absense of side effects

On Mar 14, 1:08 pm, Meikel Brandmeyer 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 > "dynamic"

Re: Some help for tool builders...

On Mar 13, 1:19 pm, Eric Thorsen 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 is private): ;; def

Re: Is Clojure's lack of support for forward referencing a feature or a bug?

On Mar 11, 4:23 pm, quasar 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 > design? You can use (

Re: What profilers are you using?

On Mar 11, 4:41 am, Allen Rohner 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 namespace for

Re: Metadata for namespaces

On Mar 4, 11:31 pm, Meikel Brandmeyer 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.) --~--~-~--~~~---~--~~ You received this message because you are

Metadata for namespaces

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 li

Re: Clojure creates lots of classloaders

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. --~--~-~--~~~---~

Re: "Adding" strings

On Feb 26, 5:11 pm, Peter Wolf 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" "

Re: JDK Annotation support?

On Feb 26, 1:05 am, Mark Derricutt 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 to a class,

*features*-var

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 fo

Re: can't get watchers on Vars to work

On Feb 23, 1:55 am, pmf 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

Re: can't get watchers on Vars to work

> (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 n

Re: Invoking Java method through method name as a String

On Feb 21, 8:31 am, Richard Lyman 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. I've tried macros,

Re: Anyone tried to create a dynamic TableModel (or ListModel)?

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] (printl

Re: Anyone tried to create a dynamic TableModel (or ListModel)?

On Feb 20, 11:40 am, Rowdy Rednose 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 add-watcher to notify state c

Anonymous classloading in JDK 6u14

Hi, I have just read about the upcoming JDK 6u14 [1], which mentions that one of the features is support for loading anonymous classes [2]. Is this being considered for Clojure? I couldn't really extract from the article whether this is backwards-compatible or how much overhead it is to maintain

Re: (Classname/staticField) is not the same as Classname/staticField

On Jan 1, 10:19 pm, CuppoJava wrote: > Hi, > For some reason the Classname/staticField macro is not working > properly for me. > > graphics=> (AudioSystem/getSystem) > # > > graphics=> AudioSystem/getSystem > java.lang.Exception: No such namespace: AudioSystem (NO_SOURCE_FILE:0) getSystem is a f

Re: metaprogramming: finding function arity and other information about the envrionment

On Dec 30, 11:08 pm, falcon 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 actually assigned to

Re: metaprogramming: finding function arity and other information about the envrionment

On Dec 30, 10:29 pm, falcon 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 function, i.e. don't

Re: Stuck with AOT + Classpath

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 > crea

Re: Vector concatenation

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 > []

ns, :gen-class and :import

I'm noticing the following slight inconvenience: when using :import and :gen-class inside a (ns ...) section, the imports are not visible for gen-class (for example, the parent class has to be fully qualified despite being previously imported via :import). To illustrate (using AOT-compiling): ;;

Re: seq and vector

On Nov 22, 10:59 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > [...] Still in general my > issue seems to be that data strucutres turn into seqs and this can > cause subtle issues as for instance the different behaviour of conj > and a simple rule such as calling vec on the seq seems to b

Re: Use of "/" to call static method in generated classes

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 f

Re: writing binary values (bytes) to a file

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))) >        

Patch for gen-class's ":exposes"

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 t