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AMI and cancelling the request
Hi,
I am using AMI to get the results of a long running job on the server. Client may decide to cancel the request. Is there a way I can cancel the current request to the server and remove the callback?
Thanks,
--Venkat.
I am using AMI to get the results of a long running job on the server. Client may decide to cancel the request. Is there a way I can cancel the current request to the server and remove the callback?
Thanks,
--Venkat.
0
Comments
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It's not possible to cancel a request. However, you could add a "cancel flag" to your AMI callback implementation, so that it ignores the response from the server.
CORBA has a request cancellation protocol message, that in theory should allow the user to cancel requests. However, there are many problems with this, in particular:- It is prone to race conditions. When the client sends a cancel message, the server might already have sent the response.
- It is not possible for the server to simply stop a thread that currently executes an operation, so all it could do would be to suppress a response from being sent to the client. But the server would continue to process the request.
- Having the server keep records for which requests responses should be suppressed introduces additional overhead.
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Thanks for your prompt reply and suggestion.
--Venkat.0