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Integrating Mainframe Applications
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A Java client can connect to a remote Gateway daemon using the TCP or SSL protocol. The Client daemon has the transport driver to connect to the CICS server as shown in the Figure 9.8. The most common Java client resides in a J2EE application server. The application server and CICS TG can be deployed in three different topologies. We describe only the most common topology, where the J2EE application server is deployed on a distributed platform while the CICS TG is deployed on z/OS, which also hosts the CICS application. A schematic but more detailed drawing in which the CICS application is exposed indirectly is shown in Figure 9.9. We will use this figure to explain how indirectly exposing CICS applications works.
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Client Application Resource Adapter TCP/ IP SSL
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z/OS, OS/390 TXSeries, VSE
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Option for integrating a CICS application using a CICS Transaction
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SOAP HTTP(s), JMS
SOAP Processor A ESB B
Application Server ECI Resource Adapter CICS TG
Application CICS TS
Detailed view of integrating a CICS application using CICS TG
Nine
In this approach, you start by using a tool to read the COBOL copybook and create application-specific classes (which are displayed as A and B in Figure 9.9). An example of this type of tool is the CICS/IMS Data Binding Wizard in IBM Rational Developer for System z. The classes, such as A and B, understand the CICS functions and data, and they handle talking to CICS using JCA. The particular resource adapter that is used is CICS ECI, which is deployed in the J2EE application server runtime. Next, you write a WSDL service contract, which is then used in tooling to generate a class skeleton, along with a SOAP processing class that handles incoming SOAP requests. The processing is done in Java code, which is easy to write. The handling code maps the incoming method calls to the access classes, aggregate functions, and transform data as required. One advantage of this approach is that you do not need to know much about the resource adapter or even anything about COBOL, except to use the copybook with the wizard in the tool. You simply invoke Java classes to perform your work. Here is a brief discussion of the various aspects of this approach of integrating mainframe applications to help you decide whether this option is suitable for your situation.
Work Required This option requires the use of the IMS/CICS Binding Wizard in the IBM Rational Developer for System z to generate application-specific classes from the copybook. A WSDL service contract must also be created, which is then used to generate skeleton classes along with a SOAP processing class. Code must be written to handle the incoming method calls, aggregate functions, and transform data as required. Technology Constraints
Requires z/OS. This approach can be used with any in-service version of CICS. in real time using synchronous messaging.
Real-Time Access and Synchronous/Asynchronous Messaging Access is
Guaranteed Delivery Delivery can be ensured if you use WebSphere MQ as the transport mechanism. Operating System Requirements
mainframe. hardware.
This option requires z/OS on the
Additional Hardware Requirements This approach requires no additional
Security SSL is supported; it provides the necessary security during
the data transport.
Integrating Mainframe Applications
Summary of Point-to-Point Integration In this section we summarize some of the results of the point-to-point integration approaches for the two types of mainframe applications. We start with the integration schemes for IMS applications. As pointed out previously, there is no one best solution for all situations. Whereas the integration schemes based on MQ are best when high transaction volumes are expected, the approach that relies on IMS TM Resource Adapter might be the best if loose coupling between the mainframe and the Web Services being exposed is desired. Table 9.1 provides a summary comparison of the various approaches for integrating IMS applications. Similar considerations apply to the CICS applications integration approaches. No single approach is best for all situations. Once again, the MQ-based approaches provide the best solution if very high transaction volumes are desired. However, if the work needed is minimal and CICS TS V3.1 is available, then directly exposing the CICS applications might be a good choice. Table 9.2 provides a comparison of the various aspects of the different integration approaches available. ESB-Based Integration Options The point-to-point integration schemes described in the previous sections are suitable when the mainframe applications need to be integrated with one or two other applications. However, if you need to integrate
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