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The core business in an enterprise are still the transactions that run day by day to make the businesses happen. The evolution of the last years showed once more the necessity of standard and modern interfaces, for the integration of transactions to distributed transactions across different platforms. Today's most standard interface is the web browser technology. For the core applications running on VSE, technology was developed to allow existing programs to interact via browser.
Based on the reliability, feasibility and security of the transactions running with CICS Transaction Server (CICS TS) in VSE, IBM developed new functions to enable the integration of existing core transactions into web processes using internet standards and web technologies.
To have access to VSE transactions via browser technologies, a 2-tier solution is available as function within the CICS Transaction Server and 3-tier solutions are available using middleware products.
2-tier solutions:
The CICS Web Support (CWS) allows to access your CICS applications directly with a browser, without a middle tier. CICS Web Support (CWS) is a feature of CICS Transaction Server . It allows to access your CICS applications directly with a browser, without a middle tier. The 3270 to HTML transformation is done on the VSE system by CWS based templates.
3-tier solutions:
Products like IBM Host Access Transformation Services (HATS) and IBM Host On-Demand (HOD) allows to access your VSE system using Telnet 3270 (TN3270) and web applications. IBM Host Access Transformation Services (HATS) and IBM Host On-Demand (HOD) are servers, that run on a middle tier system. They are responsible for transforming the 3270 screens into HTML pages that can be displayed by a web browser. Access to the VSE system is done via Telnet 3270 (TN3270). All you need on VSE is either a Telnet Daemon on VSE or on VM. The HATS Studio is delivered with HATS and allows development of web based applications which interact in the background with existing VSE applications without changes to these applications.
With browser technology - the most standard interface today, existing core VSE transactions can
Portal based solutions and distributed processes can be integrated with VSE CICS transactions.
The following software requirements must be meet in order to implement this solution:
To enable CICS transactions to be accessed from a browser via CWS,
following Steps have to be done:
- The DFHSITxx has to be changed to allow Inter System Communication (ISC=YES) and TCP/IP Communication (TCP/IP=YES)
- A conversion table must be established (skeleton DFHCNV is available in ICCF Lib59)
- The CICS startup job has to have PRD2.DFHDOC in the LIBDEF statement
- Define a TCP/IP service to be used by CWS (see Redbook SG24-5997)
- Default transactions (i.e CEDA, CEMT can now be used from a browser in the format:
http://ip-addr:port/cics/cwba/dfhwbtta/tran
- User transactions need an additional Step:
- Optional: Using the BMS maps compile job with option SYSPARM='TEMPLATE' templates can be generated and stored into a library (default is PRD2.DFHDOC). You may adapt the templates to make the screens looking nicer.
To get started with IBM Host Access Transformation Services (HATS) and IBM Host On-Demand (HOD), no changes to VSE programs are required.
Additional information for this solution scenario can be found:
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