puppetlabs/puppet — pull request #3260 by cprice404 (2014-10-30 22:14:57+00:00)
Title: (PUP-3555) Override-able cache expiration service

This commit introduces an override-able cache
expiration service for directory environment cache
entries. A caller may provide a custom implementation
of the expiration service, and it will receive
callbacks whenever a cache entry is created,
checked for expiration, or evicted.