Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm

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Figure 13. Application Server Model 4.2 Architecture of CICS Clients 50 CICS for AIX as the Transaction Server Let us relate this model to the CICS environment. The client computer runs a CICS Client, and the business application runs in a CICS for AIX region on a server computer on the LAN and is therefore not present in the client computer. This approach ensures that the business application is in a trusted environment, well away from the client computer. Resources used by the business application are accessed through the CICS for AIX region. Thus the various application services that CICS provides are available across the entire application, encompassing all of the various resources being used. If the business application, for example, changes a database and a flat file in the same business step, CICS for AIX can ensure that the changes are kept in synchronization, and integrity is thus maintained across these different resource types. As the load increases, the application server model enables multiple application servers to be set up on the LAN, and those servers can also provide gateways to other connected systems. The application server model offers the maximum flexibility and the best level of ″future proofing″ while providing an environment with excellent integrity and performance characteristics. The same architecture is used across all CICS Clients (see Figure 14 on page 51). Understanding the architecture should help you to visualize how the clients operate, so you can select the most appropriate client and design your interfaces accordingly.
Figure 14. CICS Client Architecture The components of the architecture are: Application Your user application using the ECI or the EPI CICS 3270 Support for your CICS 3270 terminal and printer emulators (see 4.2.3, “CICS 3270 Terminal Emulator” on page 53 for more information) Internal API CICS Client internal API for controlling client functions Scheduler Scheduling of client tasks APPC, TCP/IP, NetBIOS Communication protocol code Connect, Disconnect. Connection and disconnection of clients and client terminals Send, Receive... Sending and receiving of data to and from the server There are a number of different implementations of the architecture. Each is designed to achieve a different function. The implementations available are: • CICS ECI • CICS EPI • CICS 3270 emulator − cicsterm − cicsteld The ECI and EPI provide a programmable interface that enables CICS client processing to be accommodated in a non-CICS application program or a more tailored user interface than the CICS 3270 emulator can supply. The CICS 3270 emulator versions provide a means of displaying a 3270 data stream. Using a CICS 3270 emulator, a user can interact with CICS for AIX applications. The format of the display is restricted to 3270 display characters, however. Let us now examine each of these implementations in more detail. Chapter 4. Using CICS Clients 51
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Addressing OLTP Solutions with CICS
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Take Note! Before using this inform
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iv CICS for AIX as the Transaction
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9.4 Security Issues on the Internet
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viii CICS for AIX as the Transactio
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x CICS for AIX as the Transaction S
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xii CICS for AIX as the Transaction
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The Team That Wrote This Redbook xi
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Figure 30. CICS Access to Remote DB
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emote DRDA database. Information ab
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As the COMMAREA has an allowable ma
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7.5 Summary 108 CICS for AIX as the
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8.2 Workload Management 112 CICS fo
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8.4.2 System Management Application
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Figure 36. The CICS SM GUI 8.4.6 Di
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Figure 37. CICS SM Component Distri
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Figure 38. Combining Resources 122
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8.5.2 The Reference System 124 CICS
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8.6 Planning Considerations for CIC
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9.1 Some Terminology 9.2 Services 1
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Figure 41. CICS Internet Gateway fo
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9.3.3 Data Integrity The Web was or
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9.3.5 High Availability The drawbac
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or employee records, eavesdropping
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• Type, size, and quantity of rec
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10.3.3 Writing ECI and EPI Applicat
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The ANIMATOR debugging tool enables
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10.8 Summary 154 CICS for AIX as th
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11.1 The Big Picture 158 CICS for A
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11.2 User Access 160 CICS for AIX a
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Figure 44. Access to Various DB2 Da
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takes place over TCP/IP or SNA comm
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provide greater protection in the u
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How Customers Can Get ITSO Redbooks
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design. The process of composing a
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A year later ISC gave SQL formal in
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designing efficient applications 15
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