question: @ Override public void run ( ) { while ( ! isInterrupted ( ) ) { try { KeyHolder < K > ref = ( KeyHolder < K > ) _queue . remove ( ) ; V removed = _table . remove ( ref ) ; if ( _listener != null && removed != null ) _listener . weakEntryRemoved ( removed ) ; } catch ( InterruptedException e ) { interrupt ( ) ; break ; } } }
target:  Block on the queue until an entry is been cleaned by the GC