spring-projects/spring-integration — pull request #1142 by garyrussell (2014-04-24 20:22:24+00:00)
Title: INT-3382 Support Easier Aggregator Extensions

JIRA: https://jira.spring.io/browse/INT-3382

- Make private methods protected; add protected getters
- Support obtaining just metadata from stores
- Support just fetching the first message from a group
- add metaSize() to message group