[concurrency-interest] Changing delays in DelayQueue ?

Hanson Char hanson.char at gmail.com
Thu Sep 7 12:20:31 EDT 2006

Javadoc of j.u.c.DelayQueue:

    "The *head* of the queue is that Delayed element whose delay expired
furthest in the past."

I've been wondering, after the elements have been enqueued, if the above
"invariant" could still be maintained even if the delays of the elements are
modified (such that the order of the delays become different from those as
at the time when the elements were inserted.)


1) enqueue elements [a, b], whereas a.delay < b.delay
2) modify a and b such that b.delay < a.delay
3) dequeue elements

It would be nice if (3) could result in the order of [b,a], instead of
[a,b], which is the existing behavior of DelayQueue.

Is there an easy way to achieve the desired behavior without compromising
concurrency ?

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