I just realized keywords can have spaces in them. Would I ever use this for anything but ahem job security?

Hey can someone help me create and add a jar file to my lein local repo for use in another project?

@jtackett: my first thought was to use maven to install it locally. Googling leads me to believe that’s probably the right way to go

http://www.elangocheran.com/blog/2013/03/installing-jar-files-locally-for-leiningen-2/

@fitzoh: I was trying to use this library: https://github.com/kumarshantanu/lein-localrepo

@jtackett: What issues are you having?

looks like it can’t find the jar files in the maven repo after installing them using that library

do they show up when you use lein localrepo list , or not at all?

they show up with this command:

lein localrepo coords SSAM-1.0.jar SSAM-1.0.jar SSAM/SSAM 1.0

@fitzoh: ^^^

don’t show up on the list though

Yeah, that command just looks at the jar and guess what the coords should be

got ya

how do I add them to the list?

lein localrepo install [-r repo-path] [-p pom-file] <filename> <[groupId/]artifactId> <version>

so probably

lein localrepo install SSAM-1.0.jar SSAM/SSAM 1.0

the examples are

$ lein localrepo install foo-1.0.6.jar com.example/foo 1.0.6
$ lein localrepo install foomatic-1.3.9.jar foomatic 1.3.9
$ lein localrepo coords /tmp/foobar-1.0.0-SNAPSHOT.jar | xargs lein localrepo install

and once they are on the list, they should work in the project?

Assuming the plugin works like it says it does (never used it before)

@jtackett: Hi, author of lein-localrepo here. Did it work for you?

Does anybody know how you are supposed to set the delivery-settings for clojurewerkz mailer?

What’s the jvm option I need to set again when (pst *e) just returns a single line?

-XX:-OmitStackTraceInFastThrow

that's something that's been bugging me for years that I always took for granted... thx for that one

I thought that would fix this for me, but it doesn't (+ nil nil), what's going on?

ah, nevermind, it's right , thanks

Is there something like delayed_job for clojure that can store the queue of tasks in PostgreSQL?

onyx may suit your needs, though it’s far more ambitious in scope than delayed_job and friends

It might work, but it seems a bit overkill for sending emails in background.

mmm @pupeno have you tried https://github.com/michaelklishin/quartzite ?

hey guys. I’ve got a performance question. It’s on stackoverflow. Read the section after UPDATE in the question. http://stackoverflow.com/questions/33218783/clojure-reducer-map-not-working

my guess is the work of max is trivial compared to fork/join overhead

try tesser, which removes that overhead: https://github.com/aphyr/tesser

or don't do it in parallel, or try experimenting with the 'n' parameter in '(r/fold n combinef reducef coll)'

also I find this really suspect: ([t1 t2] (map max t1 t2)))

the work is being done in the call to into, that's why it makes such a big difference

try mapv to keep it eager

you shouldn't mix laziness and reducers

Is there a way to spit clojure code to a file that will write multiline strings literally, i.e. without the \n’s over multiple lines?

If there's a multimethod that dispatches on class and I want to add Clojure maps to that what should I dispatch on? Wouldn't PersistentArrayMap be to specific?

@jaen I'd recommend to stick to interfaces

you might get PersistentArrayMap or PersistentHashMap

java.util.Map would work

or clojure.lang.IPersistentMap

But class will return concrete class, not the interface right, so I won't be able to dispatch or that.

I guess I'll just change the map to a record then

@jaen: just verified. it works with clojure.lang.IPersistentMap

@theller: thanks, though I think I'll just go with creating a record, since class for map returns the concrete class, not the interface/protocol and I won't have to change the multimethod definition if I do that.

@jaen can also use clojure.lang.ILookup

records implement that

Right, but what I mean is the fact that the multimethod I have to work with dispatches on class, so I can't use interface as a dispatch value

yes you can?

Huh, then maybe I'm misunderstanding something

Ha

I guess then equals of classes takes interfaces into account?

it doesn't dispatch in equals

So I'm a bit confused how it works then

If the dispatch value is different from the value returned by class

And yet it works

http://clojure.org/multimethods see the parts about derive

@jaen @thheller if you are dispatching on class, isn't there a way to get that working with a protocol?

@bensu not sure? can a protocol dispatch on an interface? never tried that

@thheller: right; I've just checked out clojure.lang.MultiFn and it walks the parents of the value and for classes that happens to be superclasses and interfaces.

So I understand what's going on now

@bensu seems to work too 😉

@thheller: great! then I would recommend using a protocol since it's faster

hey so i’m currently checking (if (= :running @(:state component) in 3 separate places in one looping function, which seems crazy?

Does anyone know of a ClassLoader that I could use to load classes from a jar, which is not a URLClassLoader?

@cfleming URLClassLoader is still the best CL to use; it's the default loader for the JRE

@kirked: I know, but I have a kind of specialised use case.

I’m isolating leiningen using shimdandy.

Leiningen uses dynapath which allows modifying the classpath of URLClassLoaders

I need to stop it doing that, and the only way I can see of doing that is to use a different type of CL.

Perhaps I’ll just copy the URLCL code to my project and use that.

Subclass URLClassLoader and override addURL to silently ignore additions (?)

Then lein won’t work, since it will try to load plugins etc and they won’t be there.

Ideally, lein would use a CL for its work and plugins, and another for repl and compilation

Cause then you can dump the CL and everything it has can be GC'd

But I admit I don't know what it's doing

That’s basically what ShimDandy gives me.

I create an isolated CL tree, which I ditch after calling lein.

The problem is that the root of that tree is modifiable, and lein (via dynapath) adds things as high up the hierarchy as it can.

Also note that they form trees; you can only pass a parent in the constructor, but if a child can't resolve a class it'll ask the parent if there is one.

meh

seems like the opportunity is in "as high up the hierarchy as it can"

Unless I hook dynapath, I can’t fix that.

So you need a CL that disallows what, exactly? I musn't have understood

dynapath allows jars to be added to the classpath of classloaders that it recognises. Lein uses that to load plugins, middleware etc while it’s running.

So you want one that dynapath doesn't recognize

The problem is that dynapath adds them as high up the hierarchy as possible, and it knows how to modify URLClassLoaders

Right.

Go grab the source for URLClassLoader and give it your own name and package.

Thinking about it, I think I can subclass URLCL and then extend the dynapath protocol to say that my subclass is not extendable.

I’ll try that, and if not I’ll cut and paste the source.

Yeah, as long as you can do that. instanceof checks of course will still give truth.

dynapath uses a protocol, so that should be ok

There's also the close() method on URLCL. Dunno if that would help.

This is what I need, I think: https://github.com/clojure-emacs/cider-nrepl#with-jboss-asjboss-eapwildfly

Ugly, but it should work.