tree 19a4073131e17e3c2bd2d75023e681b9c2fdf7cb
parent 65d9d0ebc6174b8ba8bab4206c4e9686175fbc5c
author Yuta HIGUCHI <y-higuchi@ak.jp.nec.com> 1492209882 -0700
committer Ray Milkey <ray@onlab.us> 1493938123 +0000

Make getTimestamp() safer to call

Even if caller has checked that isTimestampAvailable() returns true,
it was possible for consecutive getTimestamp() call to throw an Exception.
e.g., another thread could have released mastership for the Device, etc.

This patch will make getTimestamp() exception-safe to call,
after confirming isTimestampAvailable() returned true,
by keeping history of last known term number of this Device.

- for ONOS-6210

Change-Id: I79e19d5f8eb95bf0b5796f87aacd5df5edd39e39