Randall R Schulz wrote
> When memory is exhausted in the inner loop of the program (the only
> place it's going to happen), I catch the OutOfMemoryError, release the
> storage, trigger a GC (forcing it would seem desirable, but I'm not
> sure how to do that) and report the failure back up the call chain.
> The vast majority of the RAM is used in the search tree, which is
> linked only upwardly from the leaves and the leaves are all in a
> priority queue, so relinquishing the priority queue is enough to make
> all the objects in the tree unreferenceable.

If your priority queue was only accessible via a SoftReference, then when a request from anywhere for more memory can not be fulfilled, your queue would be released automatically, avoiding an OOME.

The tricky parts are efficiently ensuring it is only softly referenced, and dealing correctly with the queue disappearing.

Regards,
Stephen Denne.

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