I need advice for implementing concurrent access to a memcache variable, when used by multiple running tasks. The problem is this: I have a number of tasks reading from datastore and doing some processing. When the processing is complete, i add a String to a List stored in memcache. So i need to get the List from memcache, add a new element, and put it back. The pb is that if 2 tasks write on that variable, i get an exception (I understand that the memcache service gives me a "clone" of the object, not the object itself, or am I wrong ?) So how can i avoid more than one tasks writing in the same object ?
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