clojure.data diff question
Clojure (use 'clojure.data) nil Clojure (doc diff) - clojure.data/diff ([a b]) Recursively compares a and b, returning a tuple of [things-only-in-a things-only-in-b things-in-both]. Comparison rules: * For equal a and b, return [nil nil a]. * Maps are subdiffed where keys match and values differ. * Sets are never subdiffed. * All sequential things are treated as associative collections by their indexes, with results returned as vectors. * Everything else (including strings!) is treated as an atom and compared for equality. nil Clojure (diff [a b c] [c d]) [[a b c] [c d] nil] Looks like the result doesn't match documentation: Recursively compares a and b, returning a tuple of [things-only-in-a things-only-in-b things-in-both]. -- 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: Help! Migrating to 1.3.0
Have seen this as well. For efficiency sake 1.3.0 requires :dynamic meta for convention based ear-muffed vars (intended for rebinding). The warning actually is quite descriptive if you think about it. See more in-depth discussion at http://blog.japila.pl/2011/03/cant-dynamically-bind-non-dynamic-var-in-clojure-1-3/ HTH On Jan 13, 11:47 am, labwor...@gmail.com wrote: I have a few issues. What do the following warnings mean and what should I do about them? user= (require 'mypackage) Warning: *default-encoding* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *default-encoding* or change the name. Warning: *buffer-size* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *buffer-size* or change the name. Warning: *byte-array-type* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *byte-array-type* or change the name. Warning: *append-to-writer* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *append-to-writer* or change the name. nil -- 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
:arglists question
Came across the following in one of the clojure libs (congomongo to be
exact)
https://github.com/aboekhoff/congomongo/blob/master/src/somnium/congomongo.clj:464
(defn command
Executes a database command.
{:arglists '([cmd {:options nil :from :clojure :to :clojure}])}
[cmd {:keys [options from to]
:or {options nil from :clojure to :clojure}}]
(let [db (get-db *mongo-config*)
coerced (coerce cmd [from :mongo])]
(coerce (if options
(.command db ^DBObject coerced (int options))
(.command db ^DBObject coerced))
[:mongo to])))
My question is why do we have BOTH :arglists metadata and usual fn
args destructuring?
{:arglists '([cmd {:options nil :from :clojure :to :clojure}])}
[cmd {:keys [options from to]
:or {options nil from :clojure to :clojure}}]
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clojure.math.combinatorics jar
Do we have this jar in clojars? Searched for it under math but could not find it. Found version 0.0.2 in mvnrepository.com but it is not the the version 0.0.3-SNAPSHOT mentioned in https://github.com/clojure/math.combinatorics/blob/master/pom.xml -- 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
clojure.math.combinatorics jar
Do we have this jar in clojars? Searched for it under math but could not find it. Found version 0.0.2 in mvnrepository.com but it is not the the version 0.0.3-SNAPSHOT mentioned in https://github.com/clojure/math.combinatorics/blob/master/pom.xml -- 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: Get multiple vals from a map
Thanks, Alan. It is more general solution which also works for keys
that are not keywords
user= (map {a 1 b 2 c 3} [ a b])
(1 2)
On Dec 1, 5:02 pm, Alan Malloy a...@malloys.org wrote:
I usually use juxt, but a more correct/robust solution is to use map,
with the lookup-map as the function:
(map {:foo 1 :bar 2 :baz 0} [:foo :bar])
On Dec 1, 12:26 pm, Ulises ulises.cerv...@gmail.com wrote:
How about using juxt:
sandbox ((juxt :foo :bar) {:foo 1 :bar 2 :baz 0})
[1 2]
sandbox
This only works, however, if you use keywords for keys (as they are
functions themselves).
U
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Re: Dynamically Loading Jar Strategy
You can add jar to a classpath at runtime via the hack below. http://groups.google.com/group/clojure/browse_thread/thread/95ea6e918c430e/69c0d195defeeed3?lnk=gstq=classpath#69c0d195defeeed3 HTH On Dec 7, 10:26 am, Pierre-Yves Ritschard p...@spootnik.org wrote: Hi, I have a use case where a daemon needs to read full namespaces from an external jar. I can successfuly access the namespace in the jar with tools.namespace/ find-namespaces-in-jarfile, then from the jarfile, selecting appropriate entries, coercing into readers and then loading with load- reader. This approach breaks as soon as the supplied jar does requires, since the jar is not on the classpath. I am a bit surprised that setting a classloader in the current thread with setContextClassLoader does not work, as my binding for *use-context-classloader* is the default: true. I could obviously supply a fixed directory that is always in the classpath but that would require having two configuration files, which I thought I could avoid. Is there a way around this, or am I stuck ? -- 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
Get multiple vals from a map
Is there something build in for getting multiple vals out of the map?
{:keys [...]} woks in destructuring forms. It is quite easy to build
something with filter and map but I suspect these is a common problem
somebody solved already.
Desired
(get-vals [:a :b] {:a 1 :b 2 :c 3})
(1 2)
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Re: Get multiple vals from a map
Thanks, works in my case.
On Dec 1, 3:26 pm, Ulises ulises.cerv...@gmail.com wrote:
How about using juxt:
sandbox ((juxt :foo :bar) {:foo 1 :bar 2 :baz 0})
[1 2]
sandbox
This only works, however, if you use keywords for keys (as they are
functions themselves).
U
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Re: Use of eval
Gary, You are probably removing try/catch as well. ClassNonFoundException is expected and silenced with catch. (defn cl-factory Returns a Commons Logging-based implementation of the LoggerFactory protocol, or nil if not available. [] (try (Class/forName foo.bar) ; eval removed (catch Exception e nil))) On Nov 18, 5:16 pm, Gary Trakhman gary.trakh...@gmail.com wrote: I get this when i try it in a blank project, removing the eval and the quote: Unknown location: error: java.lang.ClassNotFoundException: org.apache.commons.logging.Log core.clj:16:8: error: java.lang.ClassNotFoundException: org.apache.commons.logging.Log (core.clj:16) Compilation failed. -- 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: Proper parallelism?
Andy, You can also look into using futures (pmap uses future). In section 11.6.1 of Joy of Clojure there is a recipe how to dispatch multiple RPC calls in parallel using as-futures macro. Obviously, this depends on what you want to do with results of your REST calls. On Nov 22, 11:16 am, AndyK andy.kri...@gmail.com wrote: I have been using Clojure to write tests on RESTful applications. Since the requests are independent, parallelizing would speed things along. What is the best approach? Using pmap is the obvious first step. Afaik, pmap only creates a small pool of threads. Is there more to gain by going to the Java API's threading classes (like ExecutorService, or building a pool of threads triggered by a CountDownLatch)? What experience have folks had with different approaches? thx -- 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: Use of eval
Gary, You were right with your initial reply. Sorry I did not get it. Thanks for your help in understanding this. On Nov 22, 1:58 pm, Gary Trakhman gary.trakh...@gmail.com wrote: Also I think this line doesn't actually do anything: (Class/forName foo.bar) It will effectively just ask the classloader to load the class. You removed more than the eval in your referenced code, you removed the code that did anything. That code needs to be there. It's eval'd because it's not guaranteed to be compilable for projects without commons-logging in their classpath. (defn cl-factory Returns a Commons Logging-based implementation of the LoggerFactory protocol, or nil if not available. [] (try (Class/forName foo.bar) ; eval removed (catch Exception e nil))) -- 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: Change var in other namespace
Thanks, Sean. Exactly what I was looking for.
IMO, clojure.tools.logging could of made this easier: log
implementation from classpath by default with override by client when
needed.
On Nov 17, 11:32 pm, Sean Corfield seancorfi...@gmail.com wrote:
Note: if you just want something that will execute at startup and
force _all_ logging to use log4j, instead of wrapping code in (binding
..) then you probably want something like this:
(ns your.namespace
(:require [clojure.tools.logging :as log])
(:require [clojure.tools.logging.impl :as impl]))
(alter-var-root (var log/*logger-factory*) (constantly (impl/log4j-factory)))
This is what we ended with in our code to ensure log4j was selected at
startup...
Sean
On Thu, Nov 17, 2011 at 7:04 PM, Mark Rathwell mark.rathw...@gmail.com
wrote:
You rebind dynamic vars with binding, so your use would look something
like this:
(binding [*logger-factory* (log-impl/log4j-factory)]
(do-stuff-with-the-logger-factory-rebound))
On Thu, Nov 17, 2011 at 5:17 PM, vitalyper vitaly...@yahoo.com wrote:
clojure.tools.logging defines *logger-factory* and initializes it with
first logger implementation on the class path
(def ^{:doc
An instance satisfying the impl/LoggerFactory protocol. Used
internally to
obtain an impl/Logger. Defaults to the value returned from impl/
find-factory.
:dynamic true}
*logger-factory*
(impl/find-factory))
In my own namespace I want to redefine *logger-factory* to log4j one.
Tried different variations (def, set!, etc) in 1.3.0 with no avail.
(ns my.foo
(:gen-class)
(:use
[clojure.tools.logging :only (*logger-factory* info debug)])
(:require
[clojure.string :as s1]
[clojure.tools.logging.impl :as log-impl])
)
(defn init-logging
Force log4j factory for core tools logging
[]
(def *logger-factory* (log-impl/log4j-factory)))
; CompilerException java.lang.IllegalStateException: *logger-factory*
already refers to: #'clojure.tools.logging/*logger-factory* in
namespace: infrared.common
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Use of eval
Came across this code in clojure.tools.logging
(defn cl-factory
Returns a Commons Logging-based implementation of the LoggerFactory
protocol, or
nil if not available.
[]
(try
(Class/forName org.apache.commons.logging.Log)
(eval
`(do
(extend org.apache.commons.logging.Log
Logger
{:enabled?
(fn [logger# level#]
(condp = level#
:trace (.isTraceEnabled logger#)
:debug (.isDebugEnabled logger#)
:info (.isInfoEnabled logger#)
:warn (.isWarnEnabled logger#)
:error (.isErrorEnabled logger#)
:fatal (.isFatalEnabled logger#)
(throw (IllegalArgumentException. (str level#)
:write!
(fn [logger# level# e# msg#]
(if e#
(condp = level#
:trace (.trace logger# msg# e#)
:debug (.debug logger# msg# e#)
:info (.info logger# msg# e#)
:warn (.warn logger# msg# e#)
:error (.error logger# msg# e#)
:fatal (.fatal logger# msg# e#)
(throw (IllegalArgumentException. (str level#
(condp = level#
:trace (.trace logger# msg#)
:debug (.debug logger# msg#)
:info (.info logger# msg#)
:warn (.warn logger# msg#)
:error (.error logger# msg#)
:fatal (.fatal logger# msg#)
(throw (IllegalArgumentException. (str
level#))})
(reify LoggerFactory
(name [_#]
org.apache.commons.logging)
(get-logger [_# logger-ns#]
(org.apache.commons.logging.LogFactory/getLog (str logger-
ns#))
(catch Exception e nil)))
I do understand what it does with extend and reify but I am not clear
why eval is needed here.
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Re: Use of eval
I don't think you are right - it does compiles without it. After more thinking my guess is that eval is used to combine extend and reify in the same function. Let's see if somebody else could shed a light on this. On Nov 18, 12:45 pm, Gary Trakhman gary.trakh...@gmail.com wrote: My speculation is that the eval is required in the case that commons-logger is not in the classpath. The code wouldn't compile without it. -- 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
Change var in other namespace
clojure.tools.logging defines *logger-factory* and initializes it with
first logger implementation on the class path
(def ^{:doc
An instance satisfying the impl/LoggerFactory protocol. Used
internally to
obtain an impl/Logger. Defaults to the value returned from impl/
find-factory.
:dynamic true}
*logger-factory*
(impl/find-factory))
In my own namespace I want to redefine *logger-factory* to log4j one.
Tried different variations (def, set!, etc) in 1.3.0 with no avail.
(ns my.foo
(:gen-class)
(:use
[clojure.tools.logging :only (*logger-factory* info debug)])
(:require
[clojure.string :as s1]
[clojure.tools.logging.impl :as log-impl])
)
(defn init-logging
Force log4j factory for core tools logging
[]
(def *logger-factory* (log-impl/log4j-factory)))
; CompilerException java.lang.IllegalStateException: *logger-factory*
already refers to: #'clojure.tools.logging/*logger-factory* in
namespace: infrared.common
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