Simon Hunt 732bb2e013 GUI -- Further work on refactoring Topology View server side code. Still WIP...
- added topology client heartbeat.
- modified AbstractListenerRegistry to allow for extension.

Change-Id: Ib8ea6ad4ba34f5732d062f1c9ef545f105eb167b
2015-05-14 18:59:43 +00:00
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