#// 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();