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);
}
/**
* Flood the subscribers with the message to notify. MessageID is optional and should only used
* for QoS 1 and 2
*/
void route2Subscribers(IMessagesStore.StoredMessage pubMsg) {
final String topic = pubMsg.getTopic();
final AbstractMessage.QOSType publishingQos = pubMsg.getQos();
final ByteBuffer origMessage = pubMsg.getMessage();
LOG.debug(
"route2Subscribers republishing to existing subscribers that matches the topic {}", topic);
if (LOG.isTraceEnabled()) {
LOG.trace("content <{}>", DebugUtils.payload2Str(origMessage));
LOG.trace("subscription tree {}", subscriptions.dumpTree());
}
// if QoS 1 or 2 store the message
String guid = null;
if (publishingQos == QOSType.EXACTLY_ONCE || publishingQos == QOSType.LEAST_ONE) {
guid = m_messagesStore.storePublishForFuture(pubMsg);
}
for (final Subscription sub : subscriptions.matches(topic)) {
AbstractMessage.QOSType qos = publishingQos;
if (qos.byteValue() > sub.getRequestedQos().byteValue()) {
qos = sub.getRequestedQos();
}
ClientSession targetSession = m_sessionsStore.sessionForClient(sub.getClientId());
verifyToActivate(sub.getClientId(), targetSession);
LOG.debug(
"Broker republishing to client <{}> topic <{}> qos <{}>, active {}",
sub.getClientId(),
sub.getTopicFilter(),
qos,
targetSession.isActive());
ByteBuffer message = origMessage.duplicate();
if (qos == AbstractMessage.QOSType.MOST_ONE && targetSession.isActive()) {
// QoS 0
directSend(targetSession, topic, qos, message, false, null);
} else {
// QoS 1 or 2
// if the target subscription is not clean session and is not connected => store it
if (!targetSession.isCleanSession() && !targetSession.isActive()) {
// store the message in targetSession queue to deliver
targetSession.enqueueToDeliver(guid);
} else {
// publish
if (targetSession.isActive()) {
int messageId = targetSession.nextPacketId();
targetSession.inFlightAckWaiting(guid, messageId);
directSend(targetSession, topic, qos, message, false, messageId);
}
}
}
}
}
