Problem with multiple requests

Question

I have a problem with the users submitting multiple requests simultaneously.
Let me put it this way:
1. User is on a tabbed panel with clear and search buttons.
2. User clicks on 'clear' button from any tab (request one). On successful completion, it should reset and load tab one.
3. Before the tab one loads, user again clicks (request two) on a different tab two. (Tabbed panel - server side tab switch)
4. As a result, tab two loads. Now when I click on tab one, the default values are not getting set.
Now when I look at my phase listener logs:
Processing new  Request!
St - RESTORE_VIEW 1
En - RESTORE_VIEW 1
St - APPLY_REQUEST_VALUES 2
En - APPLY_REQUEST_VALUES 2
St - PROCESS_VALIDATIONS 3
En - PROCESS_VALIDATIONS 3
St - UPDATE_MODEL_VALUES 4
En - UPDATE_MODEL_VALUES 4
St - INVOKE_APPLICATION 5
En - INVOKE_APPLICATION 5
St - RENDER_RESPONSE 6
Processing new  Request!
St - RESTORE_VIEW 1
En - RENDER_RESPONSE 6
Done with Request!
En - RESTORE_VIEW 1
St - APPLY_REQUEST_VALUES 2
En - APPLY_REQUEST_VALUES 2
St - PROCESS_VALIDATIONS 3
En - PROCESS_VALIDATIONS 3
St - UPDATE_MODEL_VALUES 4
En - UPDATE_MODEL_VALUES 4
St - INVOKE_APPLICATION 5
En - INVOKE_APPLICATION 5
St - RENDER_RESPONSE 6
En - RENDER_RESPONSE 6
Done with Request!Looking above its very clear that request two begins before the completion of render response phase of request one. I guess thats where the problem lies and users are not really interested in solution provided by me to use javascript and freeze the page until request one completes.
I would like to know if it is possible to hold a second request in the phase listener until the first request gets completed. Any help would be highly appreciated.
Thanks.

Answer 1

Thus, you want to keep user/session-specific requests in a synchronized queue? You could put a lock in the HttpSession on start of request and remove it on end of request and synchronize the requests on that lock. You can use a Filter for this which is mapped on FacesServlet.
It's all theory and I've never done it, so I can't give a "safe" code example out of head. But googling using the terms "synchronized, lock, httpsession" gives lot of the same ideas, some with examples, under each this article: [http://www.ibm.com/developerworks/library/j-jtp09238.html].