#// Usage: jjs -scripting interface2.js

/*
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 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 */

// Simple example demonstrating how to implement java interface
// whose methods are backed by script methods of a script object

var ScriptEngineManager = Java.type("javax.script.ScriptEngineManager");
// create manager
var manager = new ScriptEngineManager();
// create engine
var engine = manager.getEngineByName("js");

// eval code - too many script escapes?
// use heredoc !
engine.eval(<<CODE
  var obj = {
    run: function() {
        print("I am run method of 'obj'");
    }
  };
CODE);

// create Java interface object whose methods are
// implemented by script methods of a script object
// This is from javax.script.Invocable. But we are
// in JS world, don't worry about types :)

var Runnable = Java.type("java.lang.Runnable");

var scriptObj = engine.get("obj");
var r = engine.getInterface(scriptObj, Runnable.class);
print(r.class);
r.run();