deliveries = new ConcurrentHashMap();
deliveries = new ConcurrentHashSet();
   public NonRecoverableState(Channel channel, boolean acceptReliableMessages)   {      this.channel = channel;      this.acceptReliableMessages = acceptReliableMessages;      messageRefs = new BasicSynchronizedPrioritizedDeque(new BasicPrioritizedDeque(10));      deliveries = new ConcurrentHashMap();      txToAddReferenceCallbacks = new ConcurrentHashMap();      txToRemoveDeliveryCallbacks = new ConcurrentHashMap();   }