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

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9.1 Some Terminology 9.2 Services 134 CICS for AIX as the Transaction Server You have to understand a number of Internet and Web browser terms before we can discuss the CICS Internet Gateway for AIX in any level of detail. URL A uniform resource locator (URL) is an addressing scheme. URLs are used to locate pages on the Web. HTML The Hypertext Markup Language (HTML) defines the format and contents of documents sent from the Web server to a Web browser for formatting and display. HTML uses tags to specify formatting and document structure and identify hypertext links. HTTP The Hypertext Transfer Protocol (HTTP) is the protocol that a Web browser uses to communicate with a Web server. Forms Initially, the information flow was essentially one-way (from Web server to Web browser) on the Internet. A forms function has been added to HTML that allows you to specify input fields that enable Web browsers to send data to the server. It allows the Web browsers to access many different types of applications, such as OLTP applications. CGI The common gateway interface (CGI) is a means of allowing a Web server to execute a program that you provide, rather than retrieving a file. For some applications, for example, displaying information from a databasee, you must do more than simply retrieve an HTML document from a disk. So the Web server has to call a program to generate the HTML to be displayed. The CICS Internet Gateway for AIX (see Figure 40 on page 135 and Figure 41 on page 136) makes it possible to access and run many existing and new CICS 3270 applications using standard Web browsers. Typically, no changes are needed in the CICS applications, and application code is not required for the gateway itself. The gateway can also be used to provide an alternative user interface for CICS applications within an enterprise as well as across the Internet. The CICS Internet Gateway for AIX provides an interface between a Web server and a CICS application, allowing conversion of 3270 data streams into the HTML format used by the Web. The CICS application can then be accessed by any Web browser.
Figure 40. CICS Internet Gateway The CICS Internet Gateway for AIX is a CGI script that takes HTML input from the Web browser, maps it to the 3270 data stream, and uses the CICS EPI to send it to a CICS server. The CICS Internet Gateway for AIX then intercepts the 3270 data stream returned by the CICS application and formats it for the Web browser. Web browsers (running on an end user′s terminal ) can directly access many Internet information services, but some complex data formats and commercial applications often need some help. The CICS Internet Gateway for AIX enhances the functions of the Web server by exploiting the CGI. The CICS Internet Gateway for AIX dynamically builds Web pages containing the CICS data and transmits them to the Web browser. The CICS Internet Gateway for AIX provides automatic translation between CICS 3270 data streams and HTML, using the CICS EPI, which is part of the CICS Client. Chapter 9. Accessing CICS from the Web 135
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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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2 CICS for AIX as the Transaction S
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1.2 Complex OLTP Business Environme
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Figure 2. OLTP Complex for XYZ Insu
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By using common application program
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1.5 OLTP Market 10 CICS for AIX as
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Figure 5. OLTP Market Segmentation
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14 CICS for AIX as the Transaction
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2.1 IBM Software Servers 2.1.1 Lotu
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2.2.1 CICS Clients V1.1.0 A Transac
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2.2.4 CICS Internet Gateway for AIX
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3.1 Services CICS for AIX is a very
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3.1.2 CICS API 24 CICS for AIX as t
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3.1.3.1 Terminal Users and CICS Reg
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3.2 Implementation 3.2.1 Components
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3.2.2 Processes 3.2.1.3 Application
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3.3.1 DCE RPC 3.3.2 TCP/IP 32 CICS
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Figure 9. Interconnection Using Enc
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connect to a PPC Gateway server mac
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Figure 12. Interconnection Using TC
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3.4.3 Configuration 3.4.4 Managing
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3.4.6 Intersystem Communication CIC
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3.4.8 Data Location 44 CICS for AIX
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3.4.11 Operations plan to cope with
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3.5 Summary 48 CICS for AIX as the
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Figure 13. Application Server Model
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4.2.1 CICS External Call Interface
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By means of mapping files, you can
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4.3 Versions 56 CICS for AIX as the
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4.4 Sample Network Configurations 4
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4.5.1 CICS Client for OS/2 60 CICS
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4.5.2 CICS Client for DOS 62 CICS f
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4.5.5 CICS Client for AIX CICS Clie
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4.6 Summary 68 CICS for AIX as the
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5.1.1 DCE Threads 5.1.2 Remote Proc
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The GDS is based on the CCITT X.500
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egion or server it is looking for.
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6.1.2 Encina Toolkit Server Core 6.
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is also necessary to use native AIX
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designing efficient applications 15
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