Re: Exception handling changes in Clojure 1.3.0
I finally came up with a simple example which shows the broken exception handling behavior I described in my earlier post on this thread. (defn broken-catch [filename] (try (java.io.FileReader. filename) (catch java.io.FileNotFoundException fnfe FileNotFoundException caught) (catch RuntimeException ioe (str RuntimeException caught; cause: (.getCause ioe) user= (broken-catch /etc/passwdXYZ) RuntimeException caught; cause: java.io.FileNotFoundException: /etc/ passwdXYZ (No such file or directory) The FileReader constructor throws a FileNotFoundException when the file specified by the argument does not exist: http://download.oracle.com/javase/6/docs/api/java/io/FileReader.html#FileReader(java.lang.String) — and as you can see here, Clojure 1.3.0 wrapped it in a RuntimeException, so the expected typed catch does not work. However, if invoked in a way which bypasses reflection, the exception is properly typed: user= (try (java.io.FileReader. /etc/passwdXYZ) (catch java.io.FileNotFoundException fnfe FileNotFoundException caught) (catch RuntimeException ioe (str RuntimeException caught; cause: (.getCause ioe FileNotFoundException caught -- 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
Google Maps in Clojurescript
Hey all, I started playing with Clojurescript tonight, and couldn't quite figure out how to access an external library -- specifically the Google Maps API -- from within a clojurescript project. I can download maps.js, but how do I go about including it in a project? Thanks, -- Sam Ritchie, Twitter Inc 703.662.1337 @sritchie09 (Too brief? Here's why! http://emailcharter.org) -- 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: clojure.contrib.base64
On 6 October 2011 19:38, Ray Miller r...@1729.org.uk wrote: Incidentally, I used the Apache Commons Base64 encoder, as the one in contrib was producing different results from the Apache Commons and Perl implementations. Perhaps a bug? Here's the problem I alluded to above. I'm trying to compute the base64 MD5 digest of the string foobar. With Perl, I'd do it like this: perl -MDigest::MD5=md5_base64 -le 'print md5_base64(foobar)' Which gives me the string: OFj2IjCsPJFfMAxmQxLGPw Now in Clojure, I can use java.security.MessageDigest to give me the MD5 digest as a byte array. When I transform this to base64 using the Apache Commons library, I get the same result as above. But when I try to do it with clojure.contrib.base64, I get a slightly different string. It's quite possible I've misunderstood the clojure.contrib.base64 API (in which case enlightenment is welcome!), but I wondered if I'd tickled a bug in the contrib library? Here's the code: (use '[clojure.contrib.io :only (to-byte-array input-stream)]) (import '[java.security MessageDigest] '[java.io StringWriter] '[org.apache.commons.codec.binary Base64]) (require '[clojure.contrib.base64 :as base64]) (def md5sum (.. (java.security.MessageDigest/getInstance MD5) (digest (to-byte-array foobar ;;= #byte[] [B@6fd33eef (org.apache.commons.codec.binary.Base64/encodeBase64String md5sum) ;;= OFj2IjCsPJFfMAxmQxLGPw== (let [output (StringWriter.)] (base64/encode (input-stream md5sum) output base64/*base64-alphabet* nil) (.toString output)) ;;= OF/2Ij+sP5FfMAxmQx/GPw== This string differs in several positions (first at character 3). Any idea what's going wrong? Ray. -- 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: Google Maps in Clojurescript
Hi Sam,
this is how I use Google Maps with Clojurescript. In the html
page I load Google's Loader library, the Google Closure base.js
file and the deps.js file which is the one cljsc spit out.
(defhtml javascripts []
(html
(include-js (str https://www.google.com/jsapi?key=; (google-api-key)))
(if (development?) (include-js /javascripts/goog/base.js))
(include-js /javascripts/deps.js)
(if (development?) (javascript-tag
goog.require('burningswell.application');
After those have been loaded I require my application namespace,
which calls the start fn at the end of the file. Something like
this:
(defn ^:export start []
(. js/google (load maps 3.6, (h/clj-js {:other_params
sensor=false})))
(. js/google
(setOnLoadCallback
(fn []
(set! *map* (init-map (goog.dom/getElement map)))
(start)
I compile Clojurescript files with this command:
cljsc src/cljs '{:externs
[closure-compiler/contrib/externs/maps/google_maps_api_v3_6.js
closure-compiler/contrib/externs/google_loader_api.js] :output-dir
resources/public/javascripts}' resources/public/javascripts/deps.js
The important stuff is the externs option when using advanced
mode. This worked for me quiet well so far. I used this way
because I want to access the user's client location via Google's
loader API.
A simpler way is to include only the Google Maps javascript file
and it's extern file. That used to work also fine ...
Hope this helps, Roman.
--
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: Google Maps in Clojurescript
Forgot to mention my init-map fn:
(defn init-map [element]
(let [options (h/clj-js {:zoom 1 :mapTypeId
google.maps.MapTypeId.ROADMAP})
parent-size (style/getSize (. element parentNode))
element-size (style/getSize element)
map (doto (google.maps.Map. element options)
(. (setCenter (to-lat-lng *location*)))
(. (setZoom 10)))]
(style/setSize element (. element-size width) (. parent-size height))
(events/listen
viewport-monitor
events/EventType.RESIZE
(fn [event] (google.maps.event/trigger map resize)
--
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: Oxjure - Oxford Clojure Group
I'm not often in the UK, but when I am, I'm in the Thames Valley. It would be great to have an Oxford Clojure group I could meet up with. On Oct 8, 1:49 pm, Folcon fol...@gmail.com wrote: Hi Everyone, I'm interested in seeing if there are enough people in Oxford, United Kingdom to start an Oxford Clojure group. I'm willing to run the group in my spare time, but it would be useful to see if there are people here who would be interested in joining. I don't know if this is the right place to make such an announcement, but I think I need to start somewhere ;). I've visited the Cambridge Clojure group in the past and they are definitely a great bunch of people, but I've found it quite hard to find the time to regularly go. I've yet to visit the London group and hope to have the opportunity to do so in the future. So I think there is a need for Oxford to have it's own group. Please chime in with thoughts and ideas. I was thinking of setting up a meeting in the next week or two. Folcon -- 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: Anyone have any tips on functional - relational db data mapping?
Can you create a db view for this? I have often tried to build this sort of thing into the db as much as possible to reduce the complexity of the app code and since this Ultimately what db's do well. Of course if you don not have create rights in the db you can't do that... On Oct 7, 7:55 am, Si si...@mintsource.org wrote: Hi all, I have a PostgreSQL database, which I am using via ClojureQL, and whilst basic relational operations are going smoothly, I'm wondering how to best tackle the n+1 selects issue and more generally how to construct a graph of maps and arrays from the relational data. As a specific example, I might fetch an array of (max 30 per page) books, but need access to the author via foreign key. I've thought of 3 methods so far: * Leave as n + 1 selects. This might be useful when laziness is really needed, but almost all the time I would want eager fetching. I'll always want the author for a given book. * Use join to retrieve all the data in one hit. I would have clashing column names, which prevents ClojureQL result map creation, and would need to rename the projected fields to include the table name or similar (there's seemingly no way to instead specify table for columns at consumption time). Then I'd need to somehow convert the flattened data to hierarchical. Perhaps create or reuse by table name partitioned columns whilst moving through the array of hash data. * Use two selects, one for the books, then one for the authors where the id is in the foreign key set found by the first query. I can see that building a nested structure from the two arrays of hash data would be fairly straightforward. It feels like this last method is more simple, or perhaps a combination might be needed, but having been infantilized by ORMs for too long, the longer term best-bet is not clear to me, so I'm soliciting advice. Does anybody have any tips on this kind of functional - relational mapping? -- 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
Is there a clojure counterpart for java.lang.String indexOf method?
java.lang.String has a method called indexOf(String str). We can use it with clojure in the following way: (.indexOf 012 12) Does clojure has a API for this? I have checked clojure.core and clojure.string. It seems that clojure does not have a counterpart for indexOf. -- 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: Is there a clojure counterpart for java.lang.String indexOf method?
On Sun, 2011-10-09 at 07:36 -0700, jingguo wrote: Does clojure has a API for this? I have checked clojure.core and clojure.string. It seems that clojure does not have a counterpart for indexOf. No, it doesn't. There's usually a way to do string operations that you traditionally do with indexOf using other tools like regular expressions; these also have the benefit of helping you avoid fencepost errors. For example, if you wanted all the text before and after 12 in a string, you could match #(?s)(.*?)12(.*). That aside, while the lack of a Clojure-level facility should give you a nudge to consider such alternatives, it's perfectly fine to call Java when needed. -- Stephen Compall ^aCollection allSatisfy: [:each|aCondition]: less is better -- 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: Anyone have any tips on functional - relational db data mapping?
I have free reign over the db. I think a view would simplify the join approach from the app perspective, and this might be a good idea when the db is normalizing data not needed to be seen by the app as separate objects, but I sense a snag with join. It would work for 1-1 relationships, but for 1- many, my pagination requirements would cull needed table rows (1 book with 29 authors would saturate my 30 row retrieval limits). I'd need to execute my base query of the books with limits via sub-select, then eager fetch join at a higher level. Using two queries is definitely looking much simpler at this point, and I can't see myself breaching SELECT IN limitations for the number of passed IDs I might be handling. The process of manually eager fetching works as hoped in experimental code (I get a nice functional-friendly set of all the data I need), and so I'm now thinking on how I might hook that in to ClojureQL. My pagination is currently taking a ClojureQL relational table object (before deref), cloning the query, and running one refined with a count function, one refined for limited data retreival. That works, but it won't if the eager fetching is part of the query passed up to the paginator doing this. That's because I'd need to have processed the query already, to find out the IDs for prefetch, and the with- paginated-results is sitting up at controller level currently ( wanting the query object, not it's result set). Perhaps I can push pagination down into the IO portion of the model code base, setting up a dynamic variable for page at request handling time. When the model wishes to fetch some books, it discovers it is in paged mode, and refines the query appropriately, leaving the eager fetching to operate higher up the stack. Bah! Feels too magical and I'd prefer explicit parameter passing unless it's a real chore (like i18n locale handling throughout a request). It might actually be simple to define my query code as taking options, then explicitly passing in the page as one. This then leaves the trickiness of spawning the extra count query when the ClojureQL query is deref-ed, and updating the metadata of the result set vector with a total count value. Actually, the total count could be lazily generated. Rather than wrap anything coming back from ClojureQL, I'd prefer to keep it as-is, enabling further query refinement. Any ideas on hooking in to ClojureQL this way? Thanks On Oct 9, 4:08 pm, Base basselh...@gmail.com wrote: Can you create a db view for this? I have often tried to build this sort of thing into the db as much as possible to reduce the complexity of the app code and since this Ultimately what db's do well. Of course if you don not have create rights in the db you can't do that... On Oct 7, 7:55 am, Si si...@mintsource.org wrote: Hi all, I have a PostgreSQL database, which I am using via ClojureQL, and whilst basic relational operations are going smoothly, I'm wondering how to best tackle the n+1 selects issue and more generally how to construct a graph of maps and arrays from the relational data. As a specific example, I might fetch an array of (max 30 per page) books, but need access to the author via foreign key. I've thought of 3 methods so far: * Leave as n + 1 selects. This might be useful when laziness is really needed, but almost all the time I would want eager fetching. I'll always want the author for a given book. * Use join to retrieve all the data in one hit. I would have clashing column names, which prevents ClojureQL result map creation, and would need to rename the projected fields to include the table name or similar (there's seemingly no way to instead specify table for columns at consumption time). Then I'd need to somehow convert the flattened data to hierarchical. Perhaps create or reuse by table name partitioned columns whilst moving through the array of hash data. * Use two selects, one for the books, then one for the authors where the id is in the foreign key set found by the first query. I can see that building a nested structure from the two arrays of hash data would be fairly straightforward. It feels like this last method is more simple, or perhaps a combination might be needed, but having been infantilized by ORMs for too long, the longer term best-bet is not clear to me, so I'm soliciting advice. Does anybody have any tips on this kind of functional - relational mapping? -- 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
Stanford Dabatabase Class Begins Tomorrow
The Stanford Introduction to Databases class officially starts tomorrow, October 10, 2011. I have enrolled and look forward to this nine-week online course. I was wondering if anyone on this list is taking it. It will be encouraging to know I am not the only Clojure programmer doing this!? -h. -- 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: clojure.contrib.base64
On Oct 9, 12:56 pm, Ray Miller r...@1729.org.uk wrote: On 6 October 2011 19:38, Ray Miller r...@1729.org.uk wrote: Incidentally, I used the Apache Commons Base64 encoder, as the one in contrib was producing different results from the Apache Commons and Perl implementations. Perhaps a bug? ... This string differs in several positions (first at character 3). Any idea what's going wrong? That does look like a bug. On closer look base64/encode does not handle negative bytes properly (java has only unsigned bytes and bitwise operations on byte arrays always cause grief). I have a fix in https://github.com/anttipoi/clojure-contrib if anyone is interested. I do have the CA sent in, so you're welcome to pull, if that is appropriate. As discussed elsewhere, the base64 module is not very efficient and is not currently planned to be migrated to a new style contrib module. Maybe using commons-codec is the best alternative for you? Yours, Teemu Antti-Poika -- 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: clojure.contrib.base64
On 9 October 2011 20:13, Teemu Antti-Poika antti...@gmail.com wrote: On Oct 9, 12:56 pm, Ray Miller r...@1729.org.uk wrote: On 6 October 2011 19:38, Ray Miller r...@1729.org.uk wrote: Incidentally, I used the Apache Commons Base64 encoder, as the one in contrib was producing different results from the Apache Commons and Perl implementations. Perhaps a bug? ... This string differs in several positions (first at character 3). Any idea what's going wrong? That does look like a bug. On closer look base64/encode does not handle negative bytes properly (java has only unsigned bytes and bitwise operations on byte arrays always cause grief). Thanks for investigating and tracking down the bug - I didn't know were to start! As discussed elsewhere, the base64 module is not very efficient and is not currently planned to be migrated to a new style contrib module. Maybe using commons-codec is the best alternative for you? I already switched my code to use commons-codec, just posted here in case it was a bug in the contrib library that might catch out someone else. Thanks again for your investigation and explanation. Ray. -- 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
ANN: core.match 0.2.0-alpha5
I've removed some fairly big bugs in the algorithm. This will probably the be the last alpha release before I cut a beta. Would love to hear any and all feedback. In particular if people have strong opinions about the remaining issues, let me know now - http://dev.clojure.org/jira/browse/MATCH Two things not listed there that I'm considering: - clojure.core.match instead of clojure.core.match.core - return nil instead of throwing if no match found to mirror the behavior of cond David -- 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: ANN: core.match 0.2.0-alpha5
On Sun, Oct 9, 2011 at 12:31, David Nolen dnolen.li...@gmail.com wrote: I've removed some fairly big bugs in the algorithm. This will probably the be the last alpha release before I cut a beta. Would love to hear any and all feedback. In particular if people have strong opinions about the remaining issues, let me know now - http://dev.clojure.org/jira/browse/MATCH Two things not listed there that I'm considering: - clojure.core.match instead of clojure.core.match.core That would have been a lot less surprising to me when I started working with the library; it feels right that the main library is named `match`, and extensions `match.whatever`, under the core namespace. - return nil instead of throwing if no match found to mirror the behavior of cond Given `:else (throw ...)` I would entirely support that from my use of the library. Thanks, Daniel -- ♲ Made with 100 percent post-consumer electrons -- 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: Stanford Dabatabase Class Begins Tomorrow
I am :) On 10 October 2011 04:02, Harrison Maseko lis...@gmail.com wrote: The Stanford Introduction to Databases class officially starts tomorrow, October 10, 2011. I have enrolled and look forward to this nine-week online course. I was wondering if anyone on this list is taking it. It will be encouraging to know I am not the only Clojure programmer doing this!? -h. -- 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 -- 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: Oxjure - Oxford Clojure Group
A real world group was more what I had in mind :). Similar to Seajure etc. @Si you are welcome to anything we manage to setup, though I am hoping we will get more interest over the week :). I'm trying to work out a good/convenient place for the gathering. Preferably with a table for laptop carriers. -- 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: Stanford Dabatabase Class Begins Tomorrow
I am, too! :) 2011/10/9 Andreas Kostler andreas.koest...@leica-geosystems.com I am :) On 10 October 2011 04:02, Harrison Maseko lis...@gmail.com wrote: The Stanford Introduction to Databases class officially starts tomorrow, October 10, 2011. I have enrolled and look forward to this nine-week online course. I was wondering if anyone on this list is taking it. It will be encouraging to know I am not the only Clojure programmer doing this!? -h. -- 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 -- 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 -- Claudia Zignaigo +39 333 1824595 http://gplus.to/gattoclaudia @gattoclaudia http://stackoverflow.com/users/560848/doppioslash -- 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: ANN: core.match 0.2.0-alpha5
On Oct 9, 12:31 pm, David Nolen dnolen.li...@gmail.com wrote: I've removed some fairly big bugs in the algorithm. This will probably the be the last alpha release before I cut a beta. Would love to hear any and all feedback. - clojure.core.match instead of clojure.core.match.core Those both seem weird to me, unless the plan is to make it part of clojure.core eventually. clojure.match is the namespace I would expect to find it under, with clojure.match.core a reasonable second choice. I assume you have a reason, though; would you mind explaining 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
Re: Spread work onto multiple threads (in pure Clojure)
I've been playing with medusa and it sometimes does what I expect, but sometimes it's doing something strange and I'm wondering if someone can help me to do one specific medusa-like thing but more simply (and without the strangeness, which I haven't fully traced but I hope to avoid having to). What I want is a version of pmap that will always use any available cores to compute remaining values (except of course the last couple of values, when there are less remaining values than cores). In other words, I want the behavior that Andy Fingerhut describes medusa as having here: On Sep 22, 2011, at 11:34 PM, Andy Fingerhut wrote: pmap will limit the maximum number of simultaneous threads. So will the medusa library's medusa-pmap. The difference is that if one job early in the list takes, e.g., 100 times longer than the next 20, and you have 4 cpus available, pmap will start the first (4+2)=6 in parallel threads, let jobs 2 through 6 complete, and then wait for the first one to finish before starting number 7. Thus most of the time will be spent running one thread. This has the advantage of limiting the memory required to store intermediate results, but the disadvantage of low usage of multiple cpu cores. Medusa has a medusa-pmap that will also limit the parallelism, but it lets you pick the level of parallelism (it isn't fixed at (# cpus + 2)), and it will continue starting new threads, even if that means using more memory when one job takes much longer than the following jobs. FWIW I'll always be calling this on a finite sequence (although it may have 1 elements or so, so I presume that I shouldn't start threads for all of them at once), and I will want a fully realized result sequence so I'll surround calls with doall if necessary. I will want all of the pmapped computations to finish before I continue doing anything else. I know that I could launch the threads in other ways -- e.g. I sometimes use agents for something similar -- but pmap is much more elegant in many cases, and anyway I'm not even sure I'm getting full utilization with my other methods. The medusa-pmap function is very close to what I want but medusa seems to do more that what I need, it requires initi/startup calls, it involves timeouts which I will never want, and it behaves strangely when I run my code on a 48 core node. (It runs fine on my 4-core laptop, and then it seems to work beautifully on the 48 core node too for a while, giving me nearly 4800% utilization, but then it does something that looks like it might be caused by everything hitting the timeouts... which I bumped up by several orders of magnitude but I'm still getting the weird behavior). So: Is there a simpler way to get pmap but not lazy and use all cores fully until the whole result sequence is completed? This is usually what I really want when I'm writing code that utilizes concurrency. I've looked at the pmap source but it isn't obvious to me how to change that to do what I want... So any pointers would be appreciated. Thanks, -Lee -- 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
where can I find the official statement about changes from 1.2 to 1.3?
When I tried to answer a question (from other people) about why in 1.3 we need to explicitly declare ^:dynamic for a Var, I found I cannot find an official document about this change from 1.2 (or older version) to 1.3. I went to github (https://github.com/clojure/clojure/ blob/master/changes.md) but only found description like 1.1 Earmuffed Vars are No Longer Automatically Considered Dynamic -- at first glance I thought that the explicit declaration thing is only for earmuffed Vars but when I tried it in a 1.3 REPL, I found we need to explicitly declare all Vars to ^:dynamic if we want a rebinding. Where can I find the official statement about this change (or other similar changes)? -- 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: Oxjure - Oxford Clojure Group
Got it. :-) On Oct 9, 11:00 am, jaime xiejianm...@gmail.com wrote: Why not use this group directly?? I personally think separating people in different groups will disperse people's attention only.what is the benefit? On Oct 8, 7:49 pm, Folcon fol...@gmail.com wrote: Hi Everyone, I'm interested in seeing if there are enough people in Oxford, United Kingdom to start an Oxford Clojure group. I'm willing to run the group in my spare time, but it would be useful to see if there are people here who would be interested in joining. I don't know if this is the right place to make such an announcement, but I think I need to start somewhere ;). I've visited the Cambridge Clojure group in the past and they are definitely a great bunch of people, but I've found it quite hard to find the time to regularly go. I've yet to visit the London group and hope to have the opportunity to do so in the future. So I think there is a need for Oxford to have it's own group. Please chime in with thoughts and ideas. I was thinking of setting up a meeting in the next week or two. Folcon -- 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
How to Collapse Nested Map into a Sequence of Flat Maps
Hi,
I'd appreciate suggestions and insights on how I can collapse a nested
map with n number of keys (levels) to create a flat map which is
comprised of composite keys and a value. For example, let's say we
have:
{ a { 2011 [ [ a 2011 ari] [ a 2011 dan] ] } { 2010 [ [ a
2010 jon] ] } }
I'd like to collapse the nest into a sequence of flat maps like:
( { [a 2011] [ [a 2011 ari] [a 2011 dan] ] }, { [a 2010]
[ [a 2010 jon] ] } )
Thanks.
Regards,
Ari
--
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: How to Collapse Nested Map into a Sequence of Flat Maps
Your input isn't a legal Clojure form, and the correlation between
input and output is difficult to spot, so it is hard to guess what you
mean. Try a simpler example, preferably with less repetition of
similar-looking values.
On Oct 9, 5:34 pm, Ari ari.brandeis.k...@gmail.com wrote:
Hi,
I'd appreciate suggestions and insights on how I can collapse a nested
map with n number of keys (levels) to create a flat map which is
comprised of composite keys and a value. For example, let's say we
have:
{ a { 2011 [ [ a 2011 ari] [ a 2011 dan] ] } { 2010 [ [ a
2010 jon] ] } }
I'd like to collapse the nest into a sequence of flat maps like:
( { [a 2011] [ [a 2011 ari] [a 2011 dan] ] }, { [a 2010]
[ [a 2010 jon] ] } )
Thanks.
Regards,
Ari
--
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: clojure.contrib.base64
The original clojure.contrib.base64 was little more than an exercise. This is the kind of thing that Java libraries do well; don't see much point to rewriting in Clojure unless somebody clever can make one that's actually *faster* than the best Java lib. -S -- 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: ANN: core.match 0.2.0-alpha5
On Mon, Oct 10, 2011 at 3:31 AM, David Nolen dnolen.li...@gmail.com wrote: - return nil instead of throwing if no match found to mirror the behavior of cond I don't like this. Why are we emulating cond? clojure.core/case, for example, seems closer to what `match` provides, and that throws an IllegalArgumentException if there is no match. Seems arbitrary to me. Is there more to it? Thanks, Ambrose -- 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
inconsistent results from String.valueOf
Hi, I discovered this testing some code this evening: (String/valueOf nil) ; throws NullPointerException (#(String/valueOf %) nil) ; null Another formulation of the above (courtesy of brehaut in IRC): (let [s nil] (String/valueOf s)) ; exception (let [s nil] (String/valueOf ^Object s)) ; null The correct output should be null. It seems that in the direct invocation, the Clojure compiler is choosing the wrong implementation of valueOf. This appears to be the same in both Clojure 1.2 and Clojure 1.3. Is this a bug? jack. -- 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: Stanford Dabatabase Class Begins Tomorrow
Great! Hope we'll cross paths on the forums. -h. On Oct 10, 1:12 am, Claudia Zignaigo claudia.doppiosl...@gmail.com wrote: I am, too! :) 2011/10/9 Andreas Kostler andreas.koest...@leica-geosystems.com I am :) On 10 October 2011 04:02, Harrison Maseko lis...@gmail.com wrote: The Stanford Introduction to Databases class officially starts tomorrow, October 10, 2011. I have enrolled and look forward to this nine-week online course. I was wondering if anyone on this list is taking it. It will be encouraging to know I am not the only Clojure programmer doing this!? -h. -- 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 -- 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 -- Claudia Zignaigo +39 333 1824595http://gplus.to/gattoclaudia @gattoclaudiahttp://stackoverflow.com/users/560848/doppioslash- Hide quoted text - - Show quoted text - -- 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
