Nashorn - @FunctionalInterface function

import jdk.nashorn.api.scripting.JSObject;

import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import java.util.function.Consumer;

class Scratch {

    public static void main(String[] args) throws Exception {

        ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");

        Bindings engineScope = engine.getBindings(ScriptContext.ENGINE_SCOPE);
        engineScope.put("window", engineScope);
        engineScope.put("self", engineScope);
        engineScope.put("parent", engineScope);
        engineScope.put("opener", engineScope);
        engineScope.put("top", engineScope);

        // http://mail.openjdk.java.net/pipermail/nashorn-dev/2013-December/002520.html
        // https://stackoverflow.com/a/33376041/622266
        engineScope.put("postMessage", (FakeWindow) (data, frameUrl) -> System.out.println("frame url:"+frameUrl));
        engineScope.put("logString", (Consumer<String>)(s) -> System.out.println("simple:"+s));

        engine.eval("window.logString('something')");
        engine.eval("window.postMessage({}, 'http://localhost');");


    }


    @FunctionalInterface
    interface FakeWindow {

        void postMessage(JSObject data, String frameUrl);

    }

}