code: public void unsubscribe( String clientID , String subscriptionName ) throws JMSException
      {
      	String subscriberID = clientID+"-"+subscriptionName;
      	
      	subscriptionsLock.writeLock().lock();
      	try
  		{
          	LocalTopicSubscription subscription = subscriptionMap.get(subscriberID);
          	if (subscription == null)
          		return;
          	
          	if (isConsumerRegistered(subscriberID))
          		throw new FFMQException("Subscription "+subscriptionName+" is still in use","SUBSCRIPTION_STILL_IN_USE");
      		
          	subscriptionMap.remove(subscriberID);
          	removeSubscription(subscription);
  		}
      	finally
      	{
      		subscriptionsLock.writeLock().unlock();
      	}
      }
docs: Unsubscribe all durable consumers for a given client ID and subscription name