public synchronized void removePvChangeListener(PvChangeListener l){
  log.debug("-PvListener:" + String.valueOf(this) + "->"+ String.valueOf(l));
  PvChangeListeners.remove(l);
}

public synchronized void removePvChangeListener ( PvChangeListener l ) { log . debug ( "-PvListener:" + String . valueOf ( this ) + "->" + String . valueOf ( l ) ) ; PvChangeListeners . remove ( l ) ; }
remove listener for pv changes
