tree f65a1f53e641155563cc4146734523f5127367d4
parent ba43736f5302cadfe63af5890757d5b3e93f1c15
author James E. Blair <jeblair@hp.com> 1423338132 -0800
committer James E. Blair <jeblair@hp.com> 1423521067 -0800

Avoid leaking dynamic change queues

On an independent pipeline manager, getChangeQueue dynamically
creates change queues (they are static on dependent pipelines).
It is possible that one might call getChangeQueue() and then
decide not to actually use the change queue which was created.
Rather than asking the programmer to remember to clean up in
that case, make the interface to getChangeQueue() a context
manager so that it is cleaned up automatically.

No existing code-path was found that needed this, but this seems
like a sensible precaution for the future.

Change-Id: Ia2805cdb4d882fafa2decaf00573f657f412d983