void remove(VisibleObject object){
  if (objects.remove(object.getObjectId()) != null) {
    if (object instanceof Player) {
      checkActiveness(playerCount.decrementAndGet() > 0);
    }
  }
}

void remove ( VisibleObject object ) { if ( objects . remove ( object . getObjectId ( ) ) != null ) { if ( object instanceof Player ) { checkActiveness ( playerCount . decrementAndGet ( ) > 0 ) ; } } }
remove aionobject from region objects list .
