When using message you use queues in WSO2 Message Broker, messages are will be removed from the message store when once the message consumers acknowledge that the messages were are received. There There are several acknowledgement models defined in in JMS specification 1.1.
To configure the time within which consumers can acknowledge that messages were received, you can set the AndesAckWaitTimeOut
entry in the JMS client as follows:
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System.setProperty("AndesAckWaitTimeOut", "30000"); |
If the acknowledgement fails within this the above time, the client informs the MB sever server that this the message was is rejected from the client. The message is then scheduled to be redelivered later by the server. If you want to limit the number of times the message broker attempts to deliver redeliver the message, you can set the maximumNumberOfMessageDeliveryAttempts
entry the maximumRedeliveryAttempts
element in the andes-configbroker.xml
file file as follows:
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<!--Broker will drop the message after the configured number of delivery attempts for each message.--> <maximumNumberOfMessageDeliveryAttempts>10<<maximumRedeliveryAttempts>10</maximumNumberOfMessageDeliveryAttempts>maximumRedeliveryAttempts> |
Note that this is the above configuration specifies the total number of delivery attempts, not re-delivery attemptsattempts to redeliver the message after the original delivery attempt. For example, when the first attempt to send the message fails, there will be another 10 attempts to redeliver the message. After the maximum number of re-delivery attempts attempts to redeliver the message are breached, the message is sent to the Dead Letter Channel. This is useful when the client application does not acknowledge the message because an operation on the message failed.
If the message is successfully delivered on a redelivery attempt, the the JMSRedelivered field field is set to 'true' in the message header, allowing the client to determine whether the message was delivered on its by the original attempt or on a redelivery later attempt.