tree d14fbecb3b31f5b58a3ca1c1df37d71c76d7699b
parent c2ec3f1bbe7271be2126b48fc94acc42a37f43f2
author Adam Lesinski <adamlesinski@google.com> 1452219893 -0800
committer Adam Lesinski <adamlesinski@google.com> 1452319132 +0000

UsageStatsService: Fix app idle issue at rollover time

App Idle queries are very frequent and so they only check in memory stats.
However, in memory stats can be missing some entries, especially after a rollover, but also
due to a larger bug fixed in master (too risky to take now).

The fix is to do a deep query (reading older files from disk) and maintain a parallel cache
of stats for app idle. That way the rolling window of data required to serve app idle queries
stays in memory.

Bug:26355386
Change-Id: I2dd3946b45d7d893410715bb0534b2b48694ced6