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clojurians | clojure | (context is everything <@Berry> :slightly_smiling_face: ) | 2017-11-06T23:46:49.000046 | Daniell |
clojurians | clojure | I assume that code is inside a macro...? | 2017-11-06T23:47:05.000195 | Daniell |
clojurians | clojure | you have to use a gensym in your example | 2017-11-06T23:47:34.000132 | Jonas |
clojurians | clojure | sorry, was afk rewriting the function as a macro | 2017-11-07T00:00:32.000074 | Berry |
clojurians | clojure | yeah, this is part of a macro, and yes, I ended up using gensym | 2017-11-07T00:00:40.000185 | Berry |
clojurians | clojure | those are just a part of the name of a function though, not syntaxes, which is why they weren't included | 2017-11-07T01:42:43.000173 | Margaret |
clojurians | clojure | seems like it is similar to `<symbol>?` predicate suffix | 2017-11-07T01:44:36.000066 | Jonas |
clojurians | clojure | <https://clojure.org/guides/weird_characters#__code_symbol_code_predicate_suffix> | 2017-11-07T01:44:38.000115 | Jonas |
clojurians | clojure | fair | 2017-11-07T01:51:50.000099 | Margaret |
clojurians | clojure | <@Charlie> <@Jonas> <@Raul> There is also the Clojure cheatsheet, with the <http://clojure.org|clojure.org> version here <https://clojure.org/api/cheatsheet> which has a link to this page that has some other variants that enable searching, but unfortunately not for the special characters. There is a dedicated section of the cheatsheet to most of the special characters you will find in Clojure, near the 'bottom left' of the page. It has links to other docs for most of them, including a link at the top of that section to Clojure guide page linked earlier: <https://clojure.org/guides/weird_characters> | 2017-11-07T03:07:51.000320 | Micha |
clojurians | clojure | is anyone familiar with scala interop? I need to construct a case object, but can't figure out how to do this from clojure | 2017-11-07T03:20:22.000089 | Jena |
clojurians | clojure | I need to create one of these case objects: <https://apache.googlesource.com/kafka/+/HEAD/core/src/main/scala/kafka/admin/RackAwareMode.scala> | 2017-11-07T03:21:09.000286 | Jena |
clojurians | clojure | Hey all! I'm trying to rewrite core.async-based code into aleph/manifold one, and can't figure out what would be equivalent for something like this:
```
(go-loop [x 0]
(if (> x 3)
x
(do
(<! (timeout 1000))
(recur (inc x)))))
```
the main problem is timeout, I have no idea what's the right way to do it with manifold deferred's: I'm making an http request with aleph and want to retry for a few times with growing backoff. Manifold docs have `Thread/sleep` somewhere, but I'm a bit scared about that one. :slightly_smiling_face: Any pointers maybe? | 2017-11-07T03:26:51.000148 | Ignacia |
clojurians | clojure | <@Ignacia> maybe `manifold.deferred/timeout!` is useful. | 2017-11-07T03:31:08.000268 | Jena |
clojurians | clojure | ```
;; o (if (p/>= g t) (float 255.0) (float 0.0))
;; o (if (p/< g t) (float 0.0) (float 255.0) )
```
^-- these two lines should do the same thing right ? I'm doing image processing, getting different results, and completely baffled | 2017-11-07T03:31:23.000355 | Berry |
clojurians | clojure | what's the `p/` namespace? | 2017-11-07T03:32:15.000064 | Jena |
clojurians | clojure | <https://github.com/ztellman/primitive-math/blob/master/src/primitive_math/Primitives.java> <@Jena> | 2017-11-07T03:32:51.000246 | Berry |
clojurians | clojure | oh, it fails when t = NaN | 2017-11-07T03:34:33.000252 | Berry |
clojurians | clojure | <@Jena> maybe, but then I have to find deferred to timeout on then... | 2017-11-07T03:41:42.000142 | Ignacia |
clojurians | clojure | not really, let's say <http://clojure.com|clojure.com> responds fast enough, but with an error, and we want to retry it few times in a row with growing backoff | 2017-11-07T04:03:30.000309 | Ignacia |
clojurians | clojure | in this case we're doing http/get, and *then* there needs to be a Thread/sleep or something similar | 2017-11-07T04:03:59.000285 | Ignacia |
clojurians | clojure | like, between `http/get` and `d/recur` | 2017-11-07T04:04:24.000109 | Ignacia |
clojurians | clojure | ah ok, so in my example, you would want to wait before calling `d/recur`? | 2017-11-07T04:06:14.000074 | Jena |
clojurians | clojure | yeah! | 2017-11-07T04:06:21.000106 | Ignacia |
clojurians | clojure | in current core.async code it looks like this:
```
(def process-message [...]
(go
...
(when retry?
(<! (timeout next-backoff-ms))
(process-message client url args success? ack-fn async-exception-fn (assoc retry-params :retry-attempt (inc retry-attempt)))))))
``` | 2017-11-07T04:06:54.000124 | Ignacia |
clojurians | clojure | try this:
```
(def case-disabled RackAwareMode.Disabled$.MODULE$)
```
Haven’t tested that out but basing this on this stackoverflow discussion <https://stackoverflow.com/questions/2561415/how-do-i-get-a-scala-case-object-from-java> | 2017-11-07T04:13:01.000030 | Cecilia |
clojurians | clojure | tbh, in such a situation i'd just run a function in a java executor, so i can use 'Thread/sleep' safely | 2017-11-07T04:20:24.000162 | Jena |
clojurians | clojure | Found a solution: | 2017-11-07T04:27:16.000100 | Jena |
clojurians | clojure | ```(import 'kafka.admin.RackAwareMode$Enforced$)
(kafka.admin.RackAwareMode$Enforced$/MODULE$)
``` | 2017-11-07T04:27:21.000240 | Jena |
clojurians | clojure | <@Jena> hm, that's an option, thanks! | 2017-11-07T04:35:26.000008 | Ignacia |
clojurians | clojure | Hi! It seems that the community has pretty much settled on using this convention for test files: <http://www.lispcast.com/clojure-test-directory> (putting the test files in a separate directory that mimics the same structure as the main project). I find it pretty tedious to mimic the directory structure, and I'd like to have the tests close to the code since I will often look at them in conjunction. Does anyone have any suggestions on how to accomplish this? I would of course like to exclude the test files from production builds. | 2017-11-07T05:08:37.000016 | Adrien |
clojurians | clojure | How deep is your directory structure? o.0 We are normally only creating a couple of extra directories for a new project. Most tooling that creates projects/files, like boot (and I assume lein) can also be make to create the test file in the expected place when you tell it to create the source one... | 2017-11-07T05:13:50.000329 | Mallie |
clojurians | clojure | Not super deep, but I find it annoying in general to have to change the same thing in several places. I also see tests as a form of documentation, and that would be nice to have as close to the code as possible. | 2017-11-07T05:16:45.000376 | Adrien |
clojurians | clojure | Why? It's just opening files. Does it really matter where they are? Especially if the structure is the same apart from the first word being `src` or `test`. You can even shell glob it when opening in most editors. Regardless, that is the same as the Java expectation, and as far as I am aware all tooling expects that structure. You *could* write a boot task that for example copies files named without `_test` into a `src` dir under `build` with the same structure and ones with `_test` into a `test` dir under `build` and then make all other boot jobs run from that dir with the structure it expects, but that seems like a lot of work. I assume you could do something similar with lein | 2017-11-07T05:21:22.000345 | Mallie |
clojurians | clojure | I find it definitely matters where the files are located when exploring a project. For example, if the tests where located next to the code, I could immediately see if the module I'm currently working on has any tests associated with it by seeing if there is a test file in the module or not.
I agree that writing any sort of complex task is not worth it, however. | 2017-11-07T05:28:56.000101 | Adrien |
clojurians | clojure | I have seen several Clojars deployment tutorials that claim you can enter a public GPG key in your profile there, but I do not see this anywhere in the site. What a I missing? | 2017-11-07T05:29:15.000129 | Marnie |
clojurians | clojure | Hi, someone work with Immutant 2 and protobuff. When i try to convert stream -> clojure hash map (in safary) i catch ```java.io.IOException: UT000034: Stream is closed``` but in chrome/firefox/ie all work fine | 2017-11-07T06:05:01.000369 | Francene |
clojurians | clojure | if you want to use clojure.test on a macro, i gather you'd have to do something like `(eval '(my-macro ...))` if the macro could throw an assertion and your `is` test is in fact testing for `thrown?`, right? | 2017-11-07T06:47:21.000079 | Marnie |
clojurians | clojure | like `(is (thrown? AssertionError (eval '(some-macro {:e :hi}))))` | 2017-11-07T06:48:11.000351 | Marnie |
clojurians | clojure | because otherwise the assertion is thrown when the test file is compiled for me | 2017-11-07T06:48:52.000213 | Marnie |
clojurians | clojure | <@Marnie> Clojars dropped using your GPG key - it was used to verify that the artifacts you uploaded were signed by you when trying to promote to the "releases" repo, which was removed. See <https://github.com/clojars/clojars-web/issues/415> for rationale | 2017-11-07T07:02:31.000109 | Candi |
clojurians | clojure | but i cannot use `lein deploy clojars` without it failing with GPG errors | 2017-11-07T07:07:40.000196 | Marnie |
clojurians | clojure | Ah, that is a different case - that's lein trying to use gpg to sign your artifacts before sending them to clojars | 2017-11-07T07:09:28.000286 | Candi |
clojurians | clojure | Have you looked at <https://github.com/technomancy/leiningen/blob/stable/doc/GPG.md>? | 2017-11-07T07:11:06.000169 | Candi |
clojurians | clojure | only too many times | 2017-11-07T07:14:03.000055 | Marnie |
clojurians | clojure | i think i'll give up on it for now | 2017-11-07T07:14:25.000213 | Marnie |
clojurians | clojure | You can disable signing by setting `:sign-releases` to false for clojars: <https://github.com/technomancy/leiningen/blob/stable/doc/GPG.md#signing-a-file> | 2017-11-07T07:15:16.000353 | Candi |
clojurians | clojure | I believe this should do it (in project.clj): `:repositories [["clojars" {:url "<https://clojars.org/repo>" :sign-releases false}]]` | 2017-11-07T07:16:20.000151 | Candi |
clojurians | clojure | is that an actual url with `/repo` or do i put one in there for my own app? i've tried this both ways and get weird errors about "missing connectors" and stuff | 2017-11-07T07:18:31.000449 | Marnie |
clojurians | clojure | That's the actual url - it's not project-specific | 2017-11-07T07:19:31.000377 | Candi |
clojurians | clojure | ok, i'll try it again in a little while, thanks | 2017-11-07T07:20:57.000216 | Marnie |
clojurians | clojure | my data_readers.clj looks like this:
```
{monitor/date monitor.utils/parse-date}
```
I start a REPL, refresh (as in, I load all the namespaces) and this happens:
```
user> #monitor/date "2016 3 1"
IllegalStateException Attempting to call unbound fn: #'monitor.utils/parse-date clojure.lang.Var$Unbound.throwArity (Var.java:43)
user> @#'monitor.utils/parse-date
#function[monitor.utils/parse-date]
```
why? | 2017-11-07T07:24:16.000037 | Ted |
clojurians | clojure | how does one supress the default logger with jetty, which is set to info,
```
2017-11-07 13:33:20.868:INFO::main: Logging initialized @3013ms
..etc...
``` | 2017-11-07T07:34:09.000308 | Lily |
clojurians | clojure | <@Lily> it depends on the logging lib you're using - with timbre you can configure it directly in Clojure, clojure.tools.looging uses underlying java libs which usually means using properties or XML files for configuration | 2017-11-07T07:43:35.000271 | Terra |
clojurians | clojure | yes it's a mystery to me what logging lib is printing this, since this is always by default with jetty, has never bothered me. Im creating terminal app and it's distracting. Looking at ring/ring-jetty-adapter dependencies, there's no logging lib there, guessing it's coming from org.eclipse.jetty/jetty-server "9.2.21.v20170120". So maybe there's some java option I could set? | 2017-11-07T07:46:36.000348 | Lily |
clojurians | clojure | maybe I found it with quick google search `-Dorg.eclipse.jetty.LEVEL=ERR` | 2017-11-07T07:48:01.000197 | Lily |
clojurians | clojure | ok this fixed it `:jvm-opts ["-Dorg.eclipse.jetty.LEVEL=OFF"]` in case someone googles the slack logs. | 2017-11-07T07:51:09.000114 | Lily |
clojurians | clojure | <@Adrien> you can technically add tests in any file, including the file with the implementation | 2017-11-07T08:00:20.000071 | Herminia |
clojurians | clojure | the reason they're in a different directory is so that you can exclude them from production deployments | 2017-11-07T08:00:44.000293 | Herminia |
clojurians | clojure | The latter | 2017-11-07T08:04:05.000307 | Sonny |
clojurians | clojure | You still need to require monitor.utils before you use the tagged literal, otherwise Clojure can’t find the constructor function | 2017-11-07T08:09:02.000396 | Sonny |
clojurians | clojure | if you add the `:test` metadata to a function, and that contains something callable, that will be run when you execute clojure.test/run-all-tests | 2017-11-07T08:59:48.000208 | Margaret |
clojurians | clojure | if it contains test/is etc. it will work just like a deftest | 2017-11-07T09:00:01.000488 | Margaret |
clojurians | clojure | I don't think `lein test` likes this, but making a task that loads your namespaces and runs clojure.test/run-all-tests is not hard at all - you can even just run your tests from the repl | 2017-11-07T09:00:54.000125 | Margaret |
clojurians | clojure | as far as I know this feature is out of date - it wasn't being handled properly(?) and nobody had the expertise or energy to manage it correctly iirc | 2017-11-07T09:01:48.000181 | Margaret |
clojurians | clojure | Thanks for the reply! I know that's why it's in a different directory. My question was wether it's possible to exclude them anyway without too much hassle. | 2017-11-07T09:28:42.000397 | Adrien |
clojurians | clojure | Clojure 1.9.0-RC1 is out -- no different than beta4. Start your engines | 2017-11-07T11:18:56.000798 | Guillermo |
clojurians | clojure | <@Guillermo> any changelog? | 2017-11-07T12:22:34.000600 | Geneva |
clojurians | clojure | it's in the repo | 2017-11-07T12:22:56.000370 | Guillermo |
clojurians | clojure | <https://github.com/clojure/clojure/blob/master/changes.md> this? | 2017-11-07T12:23:12.000624 | Geneva |
clojurians | clojure | yup | 2017-11-07T12:23:16.000211 | Guillermo |
clojurians | clojure | I was commenting a few days ago that I was having trouble calling some Clojure functions (i.e. implemented in Clojure) from my Java app. I managed to make some progress, and to call a few functions from clojure.core -- but I still haven't been able to call any Clojure functions that I've implemented myself in my own Clojure libraries. It always results in an error saying the function is unbound. | 2017-11-07T14:14:07.000518 | Lisette |
clojurians | clojure | I'm suspecting that perhaps the clojure.core functions that I call are all static - and thus defined.. and perhaps the reason I'm not able to call my own functions is related to my 'main' being a Java 'main' instead of a Clojure 'main'.. and perhaps this is resulting in the Clojure functions never getting bound in the first place due to some binding step getting skipped? (since this would only occur automatically with a Clojure main?) Anyway - trying to come up with theories/solutions. | 2017-11-07T14:15:23.000684 | Lisette |
clojurians | clojure | <@Lisette> you need to load the namespaces you want to call functions in | 2017-11-07T14:18:25.000216 | Aldo |
clojurians | clojure | using for instance `require` | 2017-11-07T14:18:42.000579 | Aldo |
clojurians | clojure | clojure.core is the only namespace loaded by default | 2017-11-07T14:19:01.000341 | Aldo |
clojurians | clojure | "clojure.core is the only namespace loaded by default" - that helps explain what I'm seeing a lot. On Friday, I had difficulty calling 'require' in particular for some reason -- but I'll get back to trying that right now. | 2017-11-07T14:20:24.000534 | Lisette |
clojurians | clojure | Clojure.var("clojure.core","require").invoke("you-ns-here"); should do the trick | 2017-11-07T14:20:52.000379 | Aldo |
clojurians | clojure | ok. I had tried this (code follows): | 2017-11-07T14:22:29.000604 | Lisette |
clojurians | clojure | ` String mumbojumbo_ns_name = System.getProperty("mumbo.jumbo.system");
IFn require = Clojure.var("clojure.core", "require");
Object mumbojumbo_ns_sym = Clojure.read(mumbojumbo_ns_name);
Object ns = require.invoke(mumbojumbo_ns_sym);` | 2017-11-07T14:22:41.000146 | Lisette |
clojurians | clojure | but keep getting: Exception in thread "main" java.lang.Exception: prefix cannot be nil, compiling:(NO_SOURCE_PATH:0:0) | 2017-11-07T14:23:02.000426 | Lisette |
clojurians | clojure | I'll try what you suggested | 2017-11-07T14:23:07.000105 | Lisette |
clojurians | clojure | When I try the code you suggest, I get this error (I've been seeing this over the past few days as I try it): | 2017-11-07T14:24:37.000648 | Lisette |
clojurians | clojure | ```Exception in thread "main" java.lang.IllegalArgumentException: Don't know how to create ISeq from: java.lang.Character``` | 2017-11-07T14:24:43.000582 | Lisette |
clojurians | clojure | oh sorry you need to symbolify it | 2017-11-07T14:25:49.000094 | Aldo |
clojurians | clojure | Clojure.var("clojure.core","require").invoke(Clojure.var("clojure.core","symbol").invoke("your-ns-here")) | 2017-11-07T14:26:16.000588 | Aldo |
clojurians | clojure | Wow. I think that's done it. Thank you :slightly_smiling_face: | 2017-11-07T14:29:00.000316 | Lisette |
clojurians | clojure | my previous attempt was along the right lines.. but just wrong. | 2017-11-07T14:29:14.000328 | Lisette |
clojurians | clojure | does anyone here use VS Code for clojure? | 2017-11-07T14:55:13.000259 | Christin |
clojurians | clojure | <@Christin> There's a <#C6H9FUNET|vscode> channel -- no idea how active it is tho'... | 2017-11-07T15:15:32.000258 | Daniell |
clojurians | clojure | thanks! | 2017-11-07T15:42:56.000294 | Christin |
clojurians | clojure | Hello guys, I am looking for a solution for background jobs which should survive Tomcat server restart or moving application to another VM on AWS. I found <https://github.com/metametadata/byplay> which looks really promising because we are already using Postgres on separate machine and jobs shouldn't do any heavy lifting (mostly tasks like send email to a user after 2 weeks and stuff like that). Do you think it's feasible to use DB as a persistent storage for jobs or should I look somewhere else? | 2017-11-07T15:58:25.000585 | Salvador |
clojurians | clojure | there are far worse ways to do that, I am unfamiliar with byplay, but it sounds perfectly reasonable | 2017-11-07T16:08:49.000236 | Rebeca |
clojurians | clojure | the idea of long running transactions doesn't sound great, in the past I've worked on systems that used postgres advisory locks instead, but I am not sure that is any better | 2017-11-07T16:11:33.000039 | Rebeca |
clojurians | clojure | Long running transaction are the only part I am worried about because there can be possibly hundreds of jobs waiting to execute and I am not sure how it can affect performance of the DB | 2017-11-07T16:32:20.000126 | Salvador |
clojurians | clojure | I would be shocked if any database had a problem storing hundreds of things | 2017-11-07T16:35:05.000158 | Rebeca |
clojurians | clojure | Storing it's not the issue I thought that lot of opened transactions might be | 2017-11-07T16:36:23.000396 | Salvador |
clojurians | clojure | generally job systems won't leave a transaction open. workers claim jobs, then relinquish them in two separate tx'es | 2017-11-07T16:37:45.000079 | Guillermo |
clojurians | clojure | having the number of open transactions scale with the number of stored jobs would be the result of a very special system | 2017-11-07T16:37:53.000311 | Rebeca |
clojurians | clojure | Ok, I've probably misunderstood the byplay documentation. It seems like worth trying to me, I am building a system with hundreds of users at maximum who generates some background tasks from time to time so it should scale | 2017-11-07T16:41:11.000438 | Salvador |
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