AMQP is a wire-level messaging protocol used by WSO2 MB for message-queueing.
Enabling the transport
The <MB_HOME>/repository/conf/broker.xml file contains parameters relating to the configuration of the AMQP transport. The transport can be enabled as shown in the following extract of the broker.xml file.
<amqp enabled="true"> <!-- most of the amqp configurations reside in qpid-config.xml since we inherit the qpid messaging model during AMQP.--> <port>5672</port> <sslPort>8672</sslPort> <sendExpiredMessagesToDLC>false</sendExpiredMessagesToDLC> <maximumRedeliveryAttempts>10</maximumRedeliveryAttempts> <allowSharedTopicSubscriptions>false</allowSharedTopicSubscriptions> </amqp>
Related Parameters
| Parameter Name | Description | Default Value |
|---|---|---|
| enabled | If the value of this parameter is true, the AMQP transport is enabled and the AMQP protocol will be applied to messages sent to the specified listening port. | true |
| port | The listening port specified for the AMQP transport. The AMQP broker would be initialized with this port by default. | 5672 |
| sslPort | The listening SSL port for the specified AMQP transport. The AMQP security socket will be initialised with this port by default. | 8672 |
| sendExpiredMessagesToDLC | This parameter determines whether the expired messages should be sent to the DLC (Dead Letter Channel) for later revival. The default value should be changed to false if you want to avoid having the DLC piled up with too many messages. | true |
| maximumRedeliveryAttempts | The maximum number of times the WSO2 MB should attempt to redeliver a message which has not reached a subscriber. For example, when the value for this is 10, Nine more attempts will be made to deliver the message. The default value can be changed depending on your reliability requirements. | 10 |
| allowSharedTopicSubscriptions | If this parameter is true, a durable subscription to a topic can be shared among multiple subscribers. That is, multiple clients can subscribe to a topic in MB using the same client ID. Read more about durable subscriptions to topics. |
Refer the description of the broker.xml file for further details.