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I’m trying to solve the following problem in Redis.
I have a list that contains various available keys:
List MASTER:
111A
222B
333C
444D
555E
I’d like to be able to pop an element off of the list and use it as a key with an expires.
After the expires is up, I’d like to be able to push this number back onto MASTER for future use. I don’t see any obvious way to do this, so I’m soliciting for a creative one.
The best method would be to get called back by Redis when the key expires and then take action.
However, callbacks support is still to be added (http://code.google.com/p/redis/issues/detail?id=360).
You can either use a Redis version that contains a custom/community modification to support this feature (like the last one in the link I’ve posted), or worse :): start tracking keys and timeouts in your client app.