tree 7cd1dba968219a767d88754fdc2f7089180c866e
parent 86b461ceb74ff508138d286c56981ac18c6fe98c
author Alex Vakulenko <avakulenko@chromium.org> 1414529416 -0700
committer chrome-internal-fetch <chrome-internal-fetch@google.com> 1414559301 +0000

buffet: Add state change queue

When device state properties are updated, compile the change
notifications in StateChangeQueue object so they can be pulled
by Cloud Server adaptor and batch-update the device state on
the server.

When StateManager receives property updates, it notifies the
StateChangeQueue object of the changes via StateChangeQueueInterface.
The changes are kept in the queue along with the their time stamps
until they are pulled by Cloud Server adaper (using StateChangeQueue
method). At this point, the adapter would notify the server of
recorded device state changes and the StateChangeQueue is cleared,
ready to record new state updates.

BUG=chromium:415364
TEST=FEATURES=test emerge-link buffet

Change-Id: Ie99e2ada39aaf0164e08699d65153abfc5235a2f
Reviewed-on: https://chromium-review.googlesource.com/226014
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>