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In some of the integration options discussed in this chapter, you ll see references to two IMS components: IMS Connect and Open Transaction Management Access (OTMA). IBM IMS Connect improves IMS TCP/IP access and enables easier access to IMS applications and data from the Internet. OTMA is a transaction-based, connectionless client/server protocol that provides an access path and an interface specification for sending and receiving transactions and data from IMS. There is no one best solution for every situation; therefore, the description of each option covers the same set of aspects so that you can compare them and then decide on a particular option for your specific environment. Here s a list of the aspects discussed:
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Work required (on the mainframe) Technology constraints Guaranteed delivery Security Cost Time to production Real-time access and synchronous/asynchronous messaging Operating system requirements Additional hardware requirements Reuse Scalability Extendibility Performance Preferred data type and protocol Data enrichment Agility
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Next we start describing various options that are available for mainframe integrations, starting with MQ-based approaches.
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MQ Enablement
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To use MQ with enablement, you need to significantly modify the CICS or IMS application using the MQ application programming interface called MQI, so that the application can receive and send MQ messages. You also need to do a substantial amount of work on the COBOL/mainframe side; however, this enablement results in a very scalable integration solution.
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There are two ways to perform this type of integration:
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You can install MQ Servers on both sides of the connection; then, you can absolutely guarantee delivery because messages are persisted on both sides. You can replace one of the two MQ Servers (either on the mainframe side or the client application side) with an MQ Client. In this case, messages are not persisted on the MQ Client; therefore, to guarantee delivery, you must design the application on the side where MQ Client is installed with much more care. However, this second option reduces costs substantially.
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Use the first method when message delivery must be 100-percent guaranteed, with no exception; you can use the second method when lower cost is a major consideration. As an example, consider the business case where a credit-card transaction must be reported to accounting by an asynchronous message so as not to block the sending application. For legal or contractual reasons, this message to accounting must be absolutely guaranteed, with no exceptions. In this case, you would use the first option. However, if the contractual or legal requirements are not so strict and lower cost is an important consideration, then the second option with MQ Client on one side of the connection should be employed. This option requires the use of MQ CICS or MQ IMS adapters. These adapters are sets of CICS/IMS programs and resource definitions that enable a CICS/IMS system to run programs that call MQI. The remaining work involves employing a pattern in the implementation to avoid flooding the CICS/IMS transaction application. MQ CICS and MQ IMS adapters are well tested and therefore add reliability to your integration solution. Figure 9.1 shows a schematic view of this option. Here is a brief discussion of the various aspects involved in this approach to integrating mainframe applications to help you decide whether this option is suitable for your situation.
Work Required MQ enablement, in principle, requires a substantial amount of work using the MQI API to add code to a COBOL application to send and receive MQ messages. This applies to both CICS and IMS transaction applications. The API work is in addition to the work required to configure queues and queue managers. You can use the CICS adapter or IMS adapter supplied with MQ to significantly reduce the amount of work. Technology Constraints
There are no technology constraints related to the operating system on the mainframe; you can use any operating system on which CICS or IMS applications run, including z/OS, MVS, and OS/390 (but, of course, not Windows or UNIX).
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