SpringSource/spring-integration — pull request #868 by garyrussell (2013-09-05 02:51:01+00:00)
Title: INT-3132 Add minSubscribers to Pub/SubChannel

Send is deemed to be successful if sent to at least this
number of subscribers (default 0).

Note: when using a task executor, if there is at least one
subscriber, a send is always good, regardless of success
or failure of invoking the handler.