tree 883702e2934c494d43226d98120194ab15175fac
parent c3b7a0f096849a65abf311792601d7e51e063f41
author Xikui Wang <xkkwww@gmail.com> 1495387670 -0700
committer Xikui Wang <xkkwww@gmail.com> 1495818979 -0700

Fix function usage check in feed

1. Add reference count field to Function entity.
2. Add reference count check when drop function.
3. Increate reference count when apply function to feed. Decrease the
   reference count when disconnect feed.
4. Add test cases for drop function that is being used and drop function
   that is no longer in use.

Change-Id: I04bed3836455997269a4cae7088dcc25c745a3df
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1763
Reviewed-by: abdullah alamoudi <bamousaa@gmail.com>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
BAD: Jenkins <jenkins@fulliautomatix.ics.uci.edu>