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Correlating Messages Using Request-Reply

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There are two ways to correlate messages in BizTalk orchestrations for IBM WebSphere MQ, server component for Windows platforms request-reply scenarios. The first is to supply the correlation identifier by setting both the MessageID (MQMD_MSGID) and the CorrelationID (MQMD_CorrelId) to the same value. The second is to use the BizTalk_CorrelationId context property.

Setting MQMD_MsgId and MQMD_CorrelId to the Same value

When sending the message to an IBM WebSphere MQ Queue Manager, you can set the message identifier (MQMD_MSGID) and the correlation identifier (MQMD_CorrelId) to the same value in the outgoing message. The IBM WebSphere MQ Queue Manager copies the MessageID to the CorrelationID for the reply message. The following figure shows the process.

Simple Correlation

You can initialize the correlation sets for the outgoing message and follow the correlation sets for the incoming message using the value of MQMD_CorrelId.

Using the MQSeries.BizTalk_CorrelationId Context Property

Instead of setting the MessageID and CorrelationID to the same value in the outgoing message, you can use the BizTalk_CorrelationID context property with a solicit-response send port of the MQSeries adapter. The following figure shows this process.

Using Solicit-Response to generate CorrelationID

To use identifiers provided by IBM WebSphere MQ Server for correlations in your BizTalk orchestration, BizTalk Server must first obtain the identifier. Your application does this through a solicit-response request. BizTalk Server sends a solicit-response request to the IBM WebSphere MQ Server by using the MQSeries adapter. In return, it receives a response with the message identifier (MQMD_MSGId) and the correlation identifier (MQMD_CorrelId).

For the outgoing message in a solicit-response send port, the adapter copies the MQMD_MSGID generated by IBM WebSphere MQ Server to the MQSeries.BizTalk_CorrelationId context property.

When receiving messages, the adapter copies the MQMD_CorrelId to the MQSeries.BizTalk_CorrelationId. In this case, using correlation sets, you can initialize the correlation sets for the outgoing message and follow the correlation sets for the incoming message using the MQSeries.BizTalk_CorrelationId.

See Also

MQSCorrelationSetOrchestrationWithSolicitResponse (BizTalk Server Sample)