Re: How do I know that a certain RPC callback is the correct one?

You need to check inside the callback's onSuccess/onFailure method if the callback should still be executed. Something like:

service.callServerMethod(new Callback() {

  final Item selectedItemOnCallback = currentItem; //currentItem is an instance variable of the presenter

  void onSuccess() {

    if(selectedItemOnCallback.equals(this.currentItem)) {

       // continue work

    }

  }

}

If this.currentItem changes after the callback as been created if won't execute its onSuccess anymore.

For Activities that are recreated whenever the data changes I use an active flag that is set to true in Activity.start() and to false in Activity.onStop/onCancel. Callbacks then check this boolean flag.

-- J.

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