tree 7939cb4903dc6ece7fcd7d3a085902d71cba2a27
parent e2439b4435769a8a2082e18698e4889dcb004727
author Abdullah Alamoudi <bamousaa@gmail.com> 1454110424 +0300
committer abdullah alamoudi <bamousaa@gmail.com> 1454111247 -0800

Add flush() to IFrameWriter

This method is expected to be used with feeds to push
frames all the way to storage when needed. As of now, it is
needed in two cases:
1. No activities in ingestion node and need to push content
   so it can be stored.
2. When the ingestion node needs to move the checkpoint ahead
   if the at least once semantics are used.

Two feeds make use of this function. The filesystem feed and
couchbase feed which was introduced as well in this change.

Change-Id: Id862ce9e9b1360864c6976f2aea2137092f51203
Reviewed-on: https://asterix-gerrit.ics.uci.edu/585
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Murtadha Hubail <hubailmor@gmail.com>