tree be10146b20e6da572d5783b9d6fe5c40a89b19af
parent 0c074b5f3f805fb4838e0bd78a52a3c1065e6ab9
author Ivan Pilat <ivanpi@google.com> 1468286047 -0700
committer Ivan Pilat <ivanpi@google.com> 1468292015 +0000

syncbase: Refactor watchable store clients to track resume markers.

Expanded watchable clients from update channels to structs encapsulating
update channels and sequence numbers (parsed resume markers). Clients
now act as iterators over the watch log.

This is in preparation for log garbage collection (watcher needs to know
when all clients are past a certain log record).

Also changed the sync watcher to stop watching when an error is
encountered instead of keep retrying since the watch client is
now an iterator. Watch should be restarted or the database
quarantined instead. Errors due to the store being closed (e.g.
database destruction) are still suppressed.

Change-Id: I78792fffeb3b85701860763c75b73326c86a51eb