SpringSource/spring-integration — pull request #683 by garyrussell (2012-11-27 02:08:51+00:00)
Title: INT-2832/2833 Aggregator Fix and Documentation

Expire empty groups.

Due to indentation changes, the code changes look more extensive
than they are. In effect the if (group.size() > 0) test is moved
to a narrower scope and the remove(group) is now performed if the
group is empty.

Document expire-groups-upon-completion.

cherry-pick to 2.1.x