Hello. I'm trying to use org.apache.commons.io.input.ObservableInputStream to make sure that I remove the file that I just streamed. For that I need to extend the abstract class org.apache.commons.io.input.ObservableInputStream$Observer and override some of its methods. I tried using proxy but the overridden methods are not called. Is this because they're not public and have the default visibility instead? My next step is to use gen-class. Is there anything simpler for this task?

Ah, my Java's a bit rusty - package private methods cannot be overridden from another package at all. And the corresponding bug in Common's JIRA says: "Fixed, will be in 2.7, whenever that comes." Oh well.

New question - is there any way to use Java files in a Clojure project while keeping the working REPL? I don't want to reload Java files, I just want them to work. Right now I just keep getting ClassNotFoundException.

do you mean (import)?

Well yeah. Only the java file is within my project source files.

It seems that Leiningen allows you to specify :java-source-paths. The thing is, I don't use Leiningen and Boot - I just use clj.

@p-himik from https://clojuredocs.org/clojure.core/import

;; For cases when 'import' does not do it for you, i.e. "live-coding"
;; You can use the DynamicClassLoader, ClassReader and the Resolver.
;; 

(def dcl (clojure.lang.DynamicClassLoader.))

(defn dynamically-load-class! 
  [class-loader class-name]
  (let [class-reader (clojure.asm.ClassReader. class-name)]
    (when class-reader
      (let [bytes (.-b class-reader)]
        (.defineClass class-loader 
                      class-name 
                      bytes
                      "")))))

(dynamically-load-class! dcl "java.lang.Long")
(dynamically-load-class! dcl 'org.joda.time.DateTime)

;; From that point the dynamically loaded class can be
;; used by the Reflector to invoke constructors, methods and to get fields. 

thats all i found, tbh i'm interested myself

Found this: https://www.mail-archive.com/[email protected]/msg103900.html More than half a year old but is probably still true.

clj is not a build tool, only a pure Clojure runner, so without something 
additional to do Java compilation, you can’t use it in a mixed source project.

Any suggestions/reads/libs on how to stub an external RESTAPI service in my tests? So far I am thinking of https://github.com/myfreeweb/clj-http-fake

what's the best way to modify a macro that expects a literal Seq to evaluate functions/symbols passed to it?

(defmacro old-printy
  [print-this]
  (if (seq print-this)
    `(print ~print-this)))

(defmacro new-printy 
  [print-this]
  (let [evaluated-print-this (cond 
                               (fn? print-this) `(~print-this) 
                               (seqable? print-this) `(seq ~print-this)
                               (symbol? print-this) `(into [] ~print-this)
                               :else print-this)]
    `(print ~evaluated-print-this)))

I forgot the (if (seq evaluated-print-this)) in the second one :face_with_rolling_eyes:

i'm just starting with core async, if i want some transformations on a channel data is that a proper way to do it?

(defn filter
  ([c] (filter (chan) c))
  ([c' c]
   (go (while true 
         (>! c' (<! c)))) ;; logic here
   c'))

no, channels can take a transducer

alright ill look into it, is above pattern useful for something?

(chan 10 (filter odd?))

that's a channel, buffer size 10, that you can put numbers into and only odds will come out

also, fyi there's #core-async for more in-depth questions

yeah, noted its just seems completely silent

just waiting for you :)

haha

How do I organize a deps.edn project with java source files?

I have something like this:

src/
   -  clj/
        - my-namespace/...
   -  java/ 
        - my-namespace/...

But when I import my java classes, clojure is unable to find them

@pablore: tools.deps is not a build tool, so you can’t do that without compiling those java classes — and for that you need to look into build tools

https://github.com/clojure/tools.deps.alpha/wiki/Tools

or just use leiningen

which will do that

Ok, migrated to leiningen, but having the same error

did you set https://github.com/technomancy/leiningen/blob/master/sample.project.clj#L306 ?

oh

Hi, is there something like https://github.com/metosin/ring-swagger but which does the reverse? So it transforms a swagger spec (or open api spec) into a working mock API endpoint?

There is some "style guide" for project's layout?

https://github.com/onyx-platform/onyx/issues/887

those of you that use Schema for data spec, there is any way to validate some data against a schema without returning an exception, only true or false ?

@jlmr if you find something like that, let me know, i'm using swagger too

you can replace s/check with s/valid? oh, schema not spec, - plumatic/schema also has a function that you can use s/check it appears schema and spec us valid vs. check in opposite ways(?)

i'll try

check returns nil if data matches the schema

how weird

s/validate throws an exception, so i have to handle it in order to not break my entire app. and i don't want to handle it

because there's often only one way to be correct, and many ways to be wrong

guess i'll have to make a wrapper fn to handle it

and make it return true or false

or i can use s/check with nil? which i think it's very weird to read

@cybersapiens97 (complement s/check) - returns a function which returns true or false in the way you want

oohh, how smart

thanks!

Hello everyone 👋. I just created an account here so it would be nice to introduce myself 🙂 My name is Radek, I'm from Poland. Not yet a clojure dev yet aiming to become one in some time. Currently working as a PHP/JS dev (w/ +10 years of experience). Proud owner of ErgoDox, VIM maniac. Currently watching season 2 of One Punch Man 😛

Poland Strong! :flag-pl: Greetings from Russia! :flag-ru: