public void addStaleCacheObserver ( String cache , StaleCacheObserver observer ) { ObserverList < StaleCacheObserver > list = _cacheobs . get ( cache ) ; if ( list == null ) { list = ObserverList . newFastUnsafe ( ) ; _cacheobs . put ( cache , list ) ; } list . add ( observer ) ; }
Registers a stale cache observer .