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MRM-1330] refactor access around the concept of a "repository session". See Javadoc for some notes. This should be a single entry point for application users of either the metadata repository, resolution, or storage access. The session needs to be explicitly closed (and modifications saved) to facilitate some storage mechanisms.
git-svn-id:
https://svn.apache.org/repos/asf/archiva/trunk@1053542 13f79535-47bb-0310-9956-ffa450edef68