Support for one-to-one singular communication

I don’t know if this makes sense to you, but it might be useful in some cases (avoids sending events from one to another). I don’t know the best way to run this on scenarios with more than one class listening to SomeEvent.

// ... some class listening to SomeEvent
public int onEvent(SomeEvent event) {
    if (event.message.equals("something")) {
        return 1;
    }

    return 0;
}

// ... some class that triggers a SomeEvent
public void whichValue() {
    EventBus.getDefault()
        .post(new SomeEvent("something"), new OnResult() {
            public void onResult(int result) {
                // do something with result
            }
        });
}

[greenrobot]

Could be an architecture smell. If 1-to-1, shouldn’t the caller know whom to call?

[alienwings]

Well, I think if solved 1-1 by 1-m, it may cause siginificantly performance loss, while two many subscribers registered. For example, how about the posted object is a base object like SuccessMessageEvent or ErrorMesssageEvent defined in network framework? Am I right?