erlang-clojure-node

Erlang-Clojure (JVM) Interop using JInterface.

Building

To get started, build the Clojure Uberjar for cljnode and compile the Erlang source files:

$ make compile

Running

Once everything has compile successfully, you can start an Erlang shell and then bring the app up:

$ make shell

application:load(clojurenode).
application:start(clojurenode).

Or, you can just use the dev make target:

$ make dev

Once the app has started, you will see output like the following (elided):

(erl_node@cahwsx01)1> src/clj_controller.erl:200:<0.44.0>:...
   starting clojure app with cmd "java -Dnode=\"clj_node@cahwsx01\" ...

src/clj_controller.erl:201:<0.44.0>: [{{2014,5,11},{22,37,1}}] ...

INFO: starting clojure app with cmd "java -Dnode=...

At this point, you are in the shell, and before too long you should also see a log message display showing the successful start of the Clojure node:

src/clj_controller.erl:131:<0.44.0>: [{{2014,5,11},{22,37,6}}] ...
INFO: connection to java node established, pid <6709.1.0>

Using

Now that you've got both ends of the connection up, you can take it for a spin with a ping command:

(erl_node@cahwsx01)1> erlang:send(
  {clj_mbox, clj_node@cahwsx01}, {ping, self()}).
{ping,<0.57.0>})

To see the response from the Clojure node, you'll need to flush the shell:

(erl_node@cahwsx01)2> flush().
Shell got {pong,<6709.1.0>}
ok

Hurray! A successful response from the Clojure node!