Package org.apache.activemq.artemis.core.protocol.mqtt

Class MQTTPublishManager

java.lang.Object

org.apache.activemq.artemis.core.protocol.mqtt.MQTTPublishManager

public class MQTTPublishManager
extends Object

Handles MQTT Exactly Once (QoS level 2) Protocol.

Constructor Summary

Constructors

Constructor	Description
MQTTPublishManager(MQTTSession session, boolean closeMqttConnectionOnPublishAuthorizationFailure)

Method Summary

Modifier and Type	Method	Description
protected void	sendMessage(ICoreMessage message, ServerConsumer consumer, int deliveryCount)	Since MQTT Subscriptions can overlap, a client may receive the same message twice.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MQTTPublishManager

public MQTTPublishManager(MQTTSession session,
                          boolean closeMqttConnectionOnPublishAuthorizationFailure)

Method Detail

sendMessage

protected void sendMessage(ICoreMessage message,
                           ServerConsumer consumer,
                           int deliveryCount)
                    throws Exception

Since MQTT Subscriptions can overlap, a client may receive the same message twice. When this happens the client returns a PubRec or PubAck with ID. But we need to know which consumer to ack, since we only have the ID to go on we are not able to decide which consumer to ack. Instead we send MQTT messages with different IDs and store a reference to original ID and consumer in the Session state. This way we can look up the consumer Id and the message Id from the PubAck or PubRec message id.

Throws:

Exception