Design pattern to handle an asynchronous response in Java

Question

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Answer 1

First, you should not reject the first two methods you discuss. There are very good reasons people are using those techniques and you should try to learn them instead of creating new ones.

Otherwise, you should look at java.util.concurrent:

ExecutorService es = Executors.newFixedThreadPool(2);
...
Future responseA = es.submit(responseGetter);
Future responseB = es.submit(responseGetter);

process(responseA.get(), responseB.get());

where responseGetter is of type Callable (you must implement the method public Response call()).