How to run clj-3df?

[theronic]

Hi guys! This looks promising, but I can't figure out how to use it. I cloned the repo, am running a differential dataflow server. Updated Leiningen to fetch some newer deps. When I try to run any of the clj-3df examples, I get an error like this:

~/Projects/clj-3df  master ?  clj -m lww                                                                                                            1 ↵  3240  19:47:21
[MIDDLEWARE] running
Exception in thread "main" java.lang.ClassCastException: clojure.core.async.impl.channels.ManyToManyChannel cannot be cast to manifold.bus.IEventBus
    at lww$_main.invokeStatic(lww.clj:52)
    at lww$_main.invoke(lww.clj:50)
    at clojure.lang.AFn.applyToHelper(AFn.java:152)
    at clojure.lang.AFn.applyTo(AFn.java:144)
    at clojure.lang.Var.applyTo(Var.java:702)
    at clojure.core$apply.invokeStatic(core.clj:657)
    at clojure.main$main_opt.invokeStatic(main.clj:317)
    at clojure.main$main_opt.invoke(main.clj:313)
    at clojure.main$main.invokeStatic(main.clj:424)
    at clojure.main$main.doInvoke(main.clj:387)
    at clojure.lang.RestFn.applyTo(RestFn.java:137)
    at clojure.lang.Var.applyTo(Var.java:702)
    at clojure.main.main(main.java:37)

Or like this:

 ~/Projects/clj-3df  master ?  clj -m runner lww                                                                                               INT(-2) ↵  3241  19:49:53
Exception in thread "main" java.lang.RuntimeException: No such var: df/debug-conn, compiling:(runner.clj:10:18)
    at clojure.lang.Compiler.analyze(Compiler.java:6792)
    at clojure.lang.Compiler.analyze(Compiler.java:6729)
    at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:3813)

[bachdavi]

The examples are not up-to-date with changes from a few months ago. We are now exclusively using core.async channels for communication between the server and Clojure. I'll create an issue and fix the examples soon.

[theronic]

Thanks! Could you provide minimal instructions to get started with a pub/sub so I can play around a bit over the weekend? :)

[bachdavi]

Yeah sure! We should update the readme too and provide some more instructions :)

When you have a look here in the core.cljc file you see an example: https://github.com/comnik/clj-3df/blob/9d0352b49c2618d23641d8692779c4e6e924f9e9/src/clj_3df/core.cljc#L291-L320

[bachdavi]

If you use create-publication the conn map will contain a :pub key that has an async-pub which dispatches on the name of the registered query. In this case it would be "loans". create-debug-publication will pipe every output that the server send also to the repl.

Hope that helps

[bachdavi]

The examples should work now. For the example rga you need to use a different branch from the server. ldbc requires you to have the data...

[comnik]

Hey yeah sorry for that, the examples are somewhat internal still. We will try and get some more usable ones out there. Lots of things are happening on the back-end right now, hard to keep up :)

(Keeping this open for now, until we have some more examples / @theronic confirms he's somewhat good to go)

[halljson]

... am running a differential dataflow server. ...

Just wanted to clarify that the running server needs to be the declarative dataflow server: https://github.com/comnik/declarative-dataflow/tree/v0.1.0#build--run

Also, the code snippet posted here is slightly out of date; looks like create-conn was renamed to create-conn! (among a few other small changes). https://github.com/comnik/clj-3df/blob/master/src/clj_3df/core.cljc#L292 appears to be up to date.