Tanken

package net.lshift.java;

import net.lshift.java.dispatch.DynamicDispatch;

public class DynamicDispatchTest
{

    /* the event hierarchy:
     * Event
     *  \
     *   SystemEvent
     *    \
     *     AdditionEvent
     */

    // define event listener interface
    public interface EventListener
    {
        public boolean handleEvent(Event e);
    }

    // implement it for some argument types
    public class SuperEventListener implements EventListener
    {
        public boolean handleEvent(Event e) {
            System.out.println("handleEvent(Event) in SuperEL called");
            return true;
        }
    }

    public class MySystemEventListener
        extends DynamicDispatchTest.SuperEventListener
    {
        public boolean handleEvent(SystemEvent e) {
            System.out.println("handleEvent(SystemEvent) in SE called");
            return true;
        }
    }

    public void basicDispatchTest()
    {
        // create a dynamic dispatcher proxy
        DynamicDispatchTest.EventListener aListener =
            (DynamicDispatchTest.EventListener) DynamicDispatch.proxy(
                DynamicDispatchTest.EventListener.class,
                new MySystemEventListener());

        // this works fine
        aListener.handleEvent(new AdditionEvent());
        // this causes a NoSuchMethodError
        aListener.handleEvent(new Event());
    }

}