Simple Event Bus with GWT

public class MyClass {
    public static interface MyHandler extends EventHandler {
        void onEvent(MyEvent event);
    }
    public static class MyEvent extends GwtEvent<MyHandler> {
        private static Type<MyHandler> type = new Type<>();
        @Override
        public Type<MyHandler> getAssociatedType() {
            return type;
        }
        @Override
        protected void dispatch(MyHandler handler) {
            handler.onEvent(this);
        }
    }

    protected final EventBus bus = new SimpleEventBus();
    public MyClass withCellSelectHandler(MyHandler handler) {
        bus.addHandler(MyEvent.type, handler);
        return this;
    }

    // somewhere in MyClass:
    bus.fireEvent(new MyEvent())
}

// usage:
new MyClass().withCellSelectHandler(event -> GWT.log("Hey"));