code: @Override
  	public int getSize()
      {
      	int size = 0;
      	subscriptionsLock.readLock().lock();
      	try
          {
      		for(LocalTopicSubscription subscription : subscriptionMap.values())
          	{
                  size += subscription.getLocalQueue().getSize();
              }
          }
      	finally
      	{
      		subscriptionsLock.readLock().unlock();
      	}
      	
      	return size;
      }
docs: /*
  (non-Javadoc)
  @see net.timewalker.ffmq4.local.destination.LocalDestinationMBean#getSize()