#// Usage: jjs -scripting interface.js

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// Example demonstrating how to implement a Java interface

// whose methods are backed by global script functions

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

function run() {

    print("run global function called");

}

CODE);

// create Java interface object whose methods are

// implemented by script functions. 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 r = engine.getInterface(Runnable.class);

print(r.class);

r.run();