Unique task queue task names only for active duration

Posted by antony.trupe on Stack Overflow See other posts from Stack Overflow or by antony.trupe
Published on 2010-05-13T01:04:43Z Indexed on 2010/05/13 1:14 UTC
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google-app-engine

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queue

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java

I want to guarantee that a task is not in a task queue more then once, so I generate a unique name based on it's payload. But, that task name is reserved for up to 7 days, which is not what I want; I only want it reserved for the duration the task is queued; it could be immediately re-queued.

Once a Task with name N is written, any subsequent attempts to insert a Task named N will fail. Eventually (at least seven days after the task successfully executes), the task will be deleted and the name N can be reused.

Is there a way to check if the named task is already in the queue then add it if it's not? Or a totally different approach?

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