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Richard,
I think you missed my point. First, yes I did do that.
Second ("the point"):
I did this to use the same abstraction that was used extensively for other purposes, instead of recreating the same abstraction with a deque as its basis. Component reusability is one of the main points of OOP, after all...
And no, an item is not necessarily available - sometimes there is a message and sometimes there isn't. But if one was put into the queue, I claim that I should be able to rely on it being available right away in the application logic.