Clean way in GWT/Java to wait for multiple asynchronous events to finish

Question

What is the best way to wait for multiple asynchronous callback functions to finish in Java before continuing. Specifically I\'m using GWT with AsyncCallback, but I think this i

Answer 1

First and foremost - don't ever get into such a situation. Redesign your RPC services such that every user flow/screen requires at most a single RPC call to work. In this case, you are making three calls to the server, and its just a waste of bandwidth. The latency will just kill your app.

If you can't and really need a hack, use a Timer to periodically poll if all data has downloaded. The code you pasted above assumes login() method will be the last to finish - which is wrong. Its may be the first to finish, and then your app will be in an indeterminate state - which is very difficult to debug.