Re: Swing unit testing
Hi, we use Jemmy for this purpose (https://jemmy.dev.java.net/) Regards Roger -- 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
Re: making sense of condp :
Hi
thanks for the answer, but I still have a problem understanding why (or when) I
want to use ::. The thing I don't understand is, that the function after :
is an unary function with the result of the matching as an argument. But the
result of the match will alway be true, otherwise there would be no match. Or
have I misunderstood the API description ?
Regards
Roger
why
Am 02.01.2010 um 22:47 schrieb Meikel Brandmeyer:
Hi,
Am 02.01.2010 um 15:23 schrieb Roger Gilliar:
I'm just trying to understand why I would use : in a condp expression. The
followjg code shows how I tried to write a test for condp, but the question
remains. Why would I want to use : ?
See here: http://groups.google.com/group/clojure/msg/d9ef152e19f5416b
It always interesting when the return value of the testing function is of
interest. Eg. with some…
(condp some foo
#{a b} : do-stuff-with-a-or-b
#{x y} : same-with-x-or-y
do-default)
So here it is interesting what was actually the match…
Sincerely
Meikel
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Re: whats the meaning of alias ?
As I understand it, the Clojure reader expects to be able to resolve namespace references as soon as it sees them. Since alias is a function, the c alias doesn't exist until sometime after the reader has already run. I think you will encounter a similar problem with the import macro. Ok, that makes sense somehow. Thanks for the explanation. Regards Roger -- 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
Re: whats the meaning of alias ?
Hi ! Now that you understand it, can you explain it me? :) - I said it makes sense not that I understand it ;-) The make sense part is: Calling alias inside a do is something I probably won't do in production code. It would make more sense to call it after an import (at least for me) wich resolves the problem. Maybe the reader does _not_ eagerly resolve c/foo when the top-level enclosing form is a do, but it _does_ eagerly resolve c/foo when the top-level enclosing form is a function? --- Thats the part I don't understand yet. Maybe bug or feature or something missing in the docs ? BTW: I started to collect my findings on github: http://github.com/rogergl/clojure-api-by-example/ Regards Roger -- 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
making sense of condp :
Hi, I'm just trying to understand why I would use : in a condp expression. The followjg code shows how I tried to write a test for condp, but the question remains. Why would I want to use : ? Regards Roger (defn foo [x] (println x) (condp = x true 1 false 2 ) ) (testing ternary clause (is (= 1 (condp = 25 1 : foo 25 : foo 42 ) )) ) -- 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
whats the meaning of alias ?
Hi ! Given the code below, I'm wondering why I get No such namespace: c It would be nice if some could explain to me what I'm doing wrong. Regards Roger (ns coretest (:use [clojure.test]) ) (defn foo [x] (condp = x true 1 false 2 ) ) (testing test alias function (is (= 1 (do (alias 'c 'coretest) (c/foo true) -- 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
Re: logging.clj and org.apache.commons.logging
Hi,
the import syntax for the java libs in the correspondig clojure
contrib source is wrong. Just change them to the correct syntax and it
works.
At least that worked for me.
Regards
Roger
Am 06.10.2009 um 11:14 schrieb dan.pomoh...@gmail.com:
Hi,
I have a maven project with java and clojure files. When I try to use
logging in clojure files the build fails with:
[INFO] [clojure:compile {execution: default-cli}]
Compiling ro.dpom.markers to /home/dan/project/target/classes
Exception in thread main java.lang.ClassNotFoundException:
org.apache.commons.logging (logging.clj:97)
But in pom.xml I have:
dependency
groupIdcommons-logging/groupId
artifactIdcommons-logging/artifactId
version1.1.1/version
/dependency
dependency
groupIdlog4j/groupId
artifactIdlog4j/artifactId
version1.2.14/version
/dependency
And the java classes from the same project using:
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
compile without problems.
I use tapestry-snapshot for clojure-contrib version 1.0-SNAPSHOT and
clojure-maven-plugin.
Thank you,
Dan Pomohaci
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Re: server-socket on exit event
I want to write a simple socket server in Clojure. I want to perform some action when a client disconnects. --- The following code works for me. read-input returns nil if the socket is closed (the client disconnects) Regards Roger (defn read-input [] (loop [result [] input (read-line)] (if input (if (= (first input) \#) result (recur (conj result input) (read-line)) ) nil))) (defn handle-client [in out] (binding [ *in* (reader in) ] (with-connection db (let [outstream (writer out)] (loop [] (let [xml (read-input)] (if xml (do (send-answers (parse outstream (makestr xml))) (recur)) (info disconnected (def server (create-server *port* handle-client)) Am 01.10.2009 um 20:39 schrieb ngocdaothanh: --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: server-socket on exit event
Am 01.10.2009 um 21:28 schrieb ngocdaothanh: Roger, your code is not event based. What do you mean by not event based ? Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: question regarding agents
Thanks for the answer. Wrapping a mutable thing like an output stream in an agent seems dubious to me. It was intended to use an agent here since I need to control the access to the write object. But what I forgot was ' the validator succeeds or if no validator was given, the return value of the given fn will become the new state of the Agent.' The function that was called by the agent returned nil, so the writer object was lost. But as you said it is better to pass the out object instead of the agent anyway. Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Q: is there a better way to do this
And even then, ensure is often not needed and overkill. Make sure you have a real business requirement that the predicate remain true (or value fixed) on transaction completion. We need to move to a world in -- It seems that my problem falls exactly in this category. Ensuring *consuming* prohibits that the consumer misses messages added to *data* . At least I hope that it does. (def *data* (ref ())) (def *consuming* (ref false)) (def *is-syncing* (ref true)) (def *consumer-agent* (agent '())) (defn data-producer [value] (if @*is-syncing* (if (dosync (if (ensure *consuming*) true (do (alter *data* conj value) false))) (do (loop [] (Thread/sleep 100) (if @*is-syncing* (recur))) (defn producer [] (doseq [i (range 1)] (data-producer i))) (defn consume [agent] (Thread/sleep 150) (dosync (ref-set *consuming* true)) (println Consuming started, (count @*data*) items to consume.) (Thread/sleep 250) (dosync (ref-set *consuming* false) (ref-set *is-syncing* false))) (defn consumer [] (send-off *consumer-agent* consume)) (doseq [i (range 300)] (future-call producer)) (consumer) (shutdown-agents) --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
question regarding agents
I have the following code: (defn handle-client [in out] (binding [ *in* (reader in) ] (with-connection db (let [outstream (agent (writer out))] (loop [] (let [xml (read-input)] (if xml (do (send-answers (parse outstream (makestr xml))) (recur)) (info disconnected The problem is, that it doesn't work to assign an agent to the outstream. If I do, the content of the agent (the outstream in this case) is set to nil after it is passed to send-answers and all send- answers does is to store the agent in a struct. Why that ? I Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Architecting a large multi-threaded process
What I want is some way to schedule tasks to be executed by some set of worker threads, and then be able to control the number of worker threads on a server. What I'm interested in is other people's opinions on how I should architect this app. This is exactly what we (a colleague and me) did with a large C++ app and it works perfectly One of the advantages I see in clojure is the built-in support for concurrency. If I would feel that this support would not be suitable for the given task I would definitely choose Java with the java.util.concurrent package. Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Q: is there a better way to do this
Hi, thanks a lot. Your code looks much better than mine. But there is one part that I don't understand: (defn producer [] (if (dosync (if (not @consuming) (alter data conj 1))) (recur))) How can I be sure that no more data is added to data after @consuming was set to true ? Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Q: is there a better way to do this
thanks a lot. Your code looks much better than mine. But there is one part that I don't understand: (defn producer [] (if (dosync (if (not @consuming) (alter data conj 1))) (recur))) After rereading the docs several times It seems that I begin to understand how this works. The values of the vars inside a dosync block are determined when the dosync block starts. This makes it impossible that @consuming changes after the dosync block is entered. True ? The remaining question is: Is it possible that data is added to data after the consumer is started ? Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Q: is there a better way to do this
.. It waits until the value is actually needed. For more details on this, see http://ociweb.com/mark/stm/article.html. . Great article.Thanks ! Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Q: how to solve this concurrency problem ?
Am 21.09.2009 um 06:50 schrieb Roger Gilliar: 2.) I modify the code like this: (if cache (cache-message content) (if (mesage-cache-agent-is-running) (send-of *message-cache-agent* send-last-message-with content ) --- This will not work, since it could happend that cached message are sent after the normal message process is started. Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Q: dosync semantics
I still have some problems to correctly understand the dosync semantic. What happens exaclty if two threads try to modify the same list: Example thread 1: (dosync append an item to a list ... ) thread 2: (dosync remove an item from a list .. ) Is it true that If thread 1 is executed 'before' thread 2 all changes in thread 2 are rollbacked and the dosync in thread 2 is executed until the change can be succesfuly applied (in this example after the dosync of thread 1 is finished )? Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Q: dosync semantics
Hi ! Am 21.09.2009 um 15:55 schrieb Jarkko Oranen: In any case, the synchronisation guarantees that if you have a starting list A, either the remove or the append operation will be applied to it, producing A', and the remaining operation will be applied to A', producing the final value of the Ref. -- Thanks. Oh, and rather than changing the discussion subject, please make a new topic. Changing the subject makes searches more difficult. -- Sorry. I didn't know that this can cause trouble. Hope it is ok to use reply right now . Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Q: why doesn't this script terminate
I call test.clj like this: java -cp /Users/roger/Library/clojure/clojure-1.0.0.jar clojure.main test.clj The script is: (defn syncnow [] (println Hello World) ) (dorun (pcalls syncnow syncnow syncnow)) But this script doesn't terminate. I have to press ctr-c to end this script. It seems that there a still some threads active. why ? Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Q: is there a better way to do this
This is some sort of repost from yesterday. But I hope that this one describes my problem more precisely. I have n threads that produce something. At some point in time a consumer starts and if the consumer starts, no more data should be produced. Right now I can only come up with the following solution which I personally don't find very elegant. Regards Roger (def data (ref '())) (def test-agent (agent '())) (def processing-started (atom false)) (defn producer [] (doseq [i (take 1000 (repeat 1))] (await test-agent) (dosync (if (= @processing-started false) (do (alter data conj i)) (defn IsTrue [d] true) (defn setme [agent] (loop [] (let[x1 (count @data)] (. Thread (sleep 1500)) (let [x2 (count @data)] (if (not= x1 x2) (recur) (dosync (swap! processing-started IsTrue) (println doesn't change anymore) (println (count @data)) (. Thread (sleep 1500)) (println (count @data)) (ref-set data '( (defn consumer [] (. Thread (sleep 350)) (send-off test-agent setme)) (dorun (apply pcalls (conj (take 200 (repeat producer)) consumer))) (shutdown-agents) (println @data) --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: problem with threading and sql lib
Nothing leaps out at me as a likely cause of a dropped message. - The only reason I can think of: It could be a problem when the loading of the JDBC driver is happening inside a thread. At least that would explain why calling (with-connection db nil ) before the thread is started, solves the problem. OTOH, the loop/recur at the end is probably better changed to a doseq. Thanks for this tip. Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Q: how to solve this concurrency problem ?
Hi, im not sure how to solve the following problem: (defn parse [outstream-agent xml] (let [content (clojure.xml/parse (ByteArrayInputStream. (. xml getBytes))) first-element (:tag content) ] (try (if @*is-syncing* (do ; iust continue f the agent is not running (await *message-cache-agent* ) (if @*is-syncing* (let [command (first-element *process-during-sync*) cache (first-element *cache-during-sync*) ] (if command (command outstream-agent content) (if cache (cache-message content) ) ) ) ((first-element *messages*) outstream-agent content) ) ) ((first-element *messages*) outstream-agent content) ) (catch Exception e (do (info (. e getMessage)) (fatal (str Unknown command: first-element)) false ) The above code can be run by n threads. If the application is syncing certain messages are going to be cached. At some point the messages in the cache needed to be processed by a different thread (the *message- cache-agent* in this example). After that *is-syncing* is false. The problem with the above code is that messages could be added to the cache after the message-cache-agent is started so that is possible that some messages are not sent by the agent. Right now I can only think of two solutions: 1.) the message-cache-agent checks for a certain amount of time if there are now new messages 2.) I modify the code like this: (if cache (cache-message content) (if (mesage-cache-agent-is-running) (send-of *message-cache-agent* send-last-message-with content ) The question is.What would be the correct solution to this problem ? Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: problem with threading and sql lib
Not from my code. Regards Roger Am 19.09.2009 um 12:11 schrieb Christophe Grand: is db dynamically rebound? On Sat, Sep 19, 2009 at 7:07 AM, Roger Gilliar ro...@gilliar.de wrote: Hi, re you opening something, using it to return a lazy sequence, and then closing it before consuming the sequence? No. I started with just opening the database connection in the handler function. Regards Roger -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.blogspot.com/ (en) --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: problem with threading and sql lib
You mention threading in the subject and you have a (binding
[...] ...) form. Are you starting a thread, or communicating with
one, or using pmap, future, an agent, or etc. inside the binding,
and expecting the binding to affect the code that runs in the thread/
map/future/agent?
Yes and no. The server created by the create-server calls calls the
handler :
(defn handle-client [in out]
(binding [
*in* (reader in)
]
(with-connection db
(let [outstream-agent (agent (writer out))
The above code is afaik executing in its own thread. But since I'm
just starting to use clojure I'm not fully understanding whats going
on inside the sql package so it could be that some of the things you
mentioned are happening inside the sql lib.
The strange thing is that everything works, except that the first
reply gets lost. It looks as if opening a database connection has some
negative impact on printing to the outstream in this case.
Maybe some problem caused by initializing the JDBC driver from inside
a thread ?
BTW: The reply function looks now like that:
(defn send-back-to-client [out xml]
(. out println xml)
(. out flush)
)
(defn send-answers [messages]
(loop [message (first messages) remaining-messages (rest messages)]
(if message
(let [{outstream-agent :outstream-agent xml-message
:message}
message]
(send-off outstream-agent send-back-to-client
xml-message)
(recur (first remaining-messages) (rest
remaining-messages))
Regards
Roger
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Re: problem with threading and sql lib
Hi, re you opening something, using it to return a lazy sequence, and then closing it before consuming the sequence? No. I started with just opening the database connection in the handler function. Regards Roger --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
