The IMS bridge
The WebSphere MQ-IMS bridge is the component of WebSphere MQ for z/OS that allows direct access from WebSphere MQ applications to applications on your IMS system (the bridge enables implicit MQI support). This means that we can re-engineer legacy applications that were controlled by 3270-connected terminals to be controlled by WebSphere MQ messages, without having to rewrite, recompile, or re-link them. The bridge is an IMS Open Transaction Manager Access (OTMA) client.
In bridge applications there are no WebSphere MQ calls within the IMS application. The application gets its input using a GET UNIQUE (GU) to the IOPCB and sends its output using an ISRT to the IOPCB. WebSphere MQ applications use the IMS header (the MQIIH structure) in the message data to ensure that the applications can execute as they did when driven by nonprogrammable terminals. If you are using an IMS application that processes multi-segment messages, note that all segments should be contained within one WebSphere MQ message.
The IMS bridge is illustrated in Figure 18.
A queue manager can connect to one or more IMS systems, and more than one queue manager can connect to one IMS system. The only restriction is that they must all belong to the same XCF group and must all be in the same sysplex.
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