public void internalPublish(PublishMessage msg) {
    final AbstractMessage.QOSType qos = msg.getQos();
    final String topic = msg.getTopicName();
    LOG.info("embedded PUBLISH on topic <{}> with QoS {}", topic, qos);

    String guid = null;
    IMessagesStore.StoredMessage toStoreMsg = asStoredMessage(msg);
    toStoreMsg.setClientID("BROKER_SELF");
    toStoreMsg.setMessageID(1);
    if (qos == AbstractMessage.QOSType.EXACTLY_ONCE) { // QoS2
      guid = m_messagesStore.storePublishForFuture(toStoreMsg);
    }
    route2Subscribers(toStoreMsg);

    if (!msg.isRetainFlag()) {
      return;
    }
    if (qos == AbstractMessage.QOSType.MOST_ONE || !msg.getPayload().hasRemaining()) {
      // QoS == 0 && retain => clean old retained
      m_messagesStore.cleanRetained(topic);
      return;
    }
    if (guid == null) {
      // before wasn't stored
      guid = m_messagesStore.storePublishForFuture(toStoreMsg);
    }
    m_messagesStore.storeRetained(topic, guid);
  }
  protected void directSend(
      ClientSession clientsession,
      String topic,
      AbstractMessage.QOSType qos,
      ByteBuffer message,
      boolean retained,
      Integer messageID) {
    String clientId = clientsession.clientID;
    LOG.debug(
        "directSend invoked clientId <{}> on topic <{}> QoS {} retained {} messageID {}",
        clientId,
        topic,
        qos,
        retained,
        messageID);
    PublishMessage pubMessage = new PublishMessage();
    pubMessage.setRetainFlag(retained);
    pubMessage.setTopicName(topic);
    pubMessage.setQos(qos);
    pubMessage.setPayload(message);

    LOG.info("send publish message to <{}> on topic <{}>", clientId, topic);
    if (LOG.isDebugEnabled()) {
      LOG.debug("content <{}>", DebugUtils.payload2Str(message));
    }
    // set the PacketIdentifier only for QoS > 0
    if (pubMessage.getQos() != AbstractMessage.QOSType.MOST_ONE) {
      pubMessage.setMessageID(messageID);
    } else {
      if (messageID != null) {
        throw new RuntimeException(
            "Internal bad error, trying to forwardPublish a QoS 0 message with PacketIdentifier: "
                + messageID);
      }
    }

    if (m_clientIDs == null) {
      throw new RuntimeException(
          "Internal bad error, found m_clientIDs to null while it should be initialized, somewhere it's overwritten!!");
    }
    LOG.debug("clientIDs are {}", m_clientIDs);
    if (m_clientIDs.get(clientId) == null) {
      // TODO while we were publishing to the target client, that client disconnected,
      // could happen is not an error HANDLE IT
      throw new RuntimeException(
          String.format(
              "Can't find a ConnectionDescriptor for client <%s> in cache <%s>",
              clientId, m_clientIDs));
    }
    ServerChannel session = m_clientIDs.get(clientId).session;
    LOG.debug("Session for clientId {} is {}", clientId, session);

    String user = (String) session.getAttribute(NettyChannel.ATTR_KEY_USERNAME);
    if (!m_authorizator.canRead(topic, user, clientId)) {
      LOG.debug("topic {} doesn't have read credentials", topic);
      return;
    }
    session.write(pubMessage);
  }
 private static IMessagesStore.StoredMessage asStoredMessage(PublishMessage msg) {
   IMessagesStore.StoredMessage stored =
       new IMessagesStore.StoredMessage(
           msg.getPayload().array(), msg.getQos(), msg.getTopicName());
   stored.setRetained(msg.isRetainFlag());
   stored.setMessageID(msg.getMessageID());
   return stored;
 }
  public void processPublish(ServerChannel session, PublishMessage msg) {
    LOG.trace("PUB --PUBLISH--> SRV executePublish invoked with {}", msg);
    String clientID = (String) session.getAttribute(NettyChannel.ATTR_KEY_CLIENTID);
    final String topic = msg.getTopicName();
    // check if the topic can be wrote
    String user = (String) session.getAttribute(NettyChannel.ATTR_KEY_USERNAME);
    if (!m_authorizator.canWrite(topic, user, clientID)) {
      LOG.debug("topic {} doesn't have write credentials", topic);
      return;
    }
    final AbstractMessage.QOSType qos = msg.getQos();
    final Integer messageID = msg.getMessageID();
    LOG.info("PUBLISH from clientID <{}> on topic <{}> with QoS {}", clientID, topic, qos);

    String guid = null;
    IMessagesStore.StoredMessage toStoreMsg = asStoredMessage(msg);
    toStoreMsg.setClientID(clientID);
    if (qos == AbstractMessage.QOSType.MOST_ONE) { // QoS0
      route2Subscribers(toStoreMsg);
    } else if (qos == AbstractMessage.QOSType.LEAST_ONE) { // QoS1
      route2Subscribers(toStoreMsg);
      sendPubAck(clientID, messageID);
      LOG.debug("replying with PubAck to MSG ID {}", messageID);
    } else if (qos == AbstractMessage.QOSType.EXACTLY_ONCE) { // QoS2
      guid = m_messagesStore.storePublishForFuture(toStoreMsg);
      sendPubRec(clientID, messageID);
      // Next the client will send us a pub rel
      // NB publish to subscribers for QoS 2 happen upon PUBREL from publisher
    }

    if (msg.isRetainFlag()) {
      if (qos == AbstractMessage.QOSType.MOST_ONE) {
        // QoS == 0 && retain => clean old retained
        m_messagesStore.cleanRetained(topic);
      } else {
        if (!msg.getPayload().hasRemaining()) {
          m_messagesStore.cleanRetained(topic);
        } else {
          if (guid == null) {
            // before wasn't stored
            guid = m_messagesStore.storePublishForFuture(toStoreMsg);
          }
          m_messagesStore.storeRetained(topic, guid);
        }
      }
    }
    m_interceptor.notifyTopicPublished(msg, clientID);
  }