protected void discardWorkingSetState(){
  visibleWorkingSetIds.clear();
  orderedWorkingSetIds.clear();
}

protected void discardWorkingSetState ( ) { visibleWorkingSetIds . clear ( ) ; orderedWorkingSetIds . clear ( ) ; }
discards the state of the working set manager . this state is equivalent with the persisted state . overriding methods should call super to make sure the entire state of the working set manager is discarded .
