CICS Transaction Gateway V5 The WebSphere ... - IBM Redbooks

242 CICS Transaction Gateway V5
CTGTesterECI
The CTGTesterECI enterprise application is a servlet-based Web application that
calls the specified COMMAREA-based CICS program and displays the result of
the returned COMMAREA (see Figure 10-3).
Web browser
HTML
JSP
WebSphere
Application Server
Web container
servlet
CTGTesterECIServlet
CICS TG
CICS TG
Java
classes
z/OS
Figure 10-3 Application architecture of CTGTesterECI, local mode
CICS TS V2.2
EC01
(COBOL
program)
The flow of control through the enterprise application is as follows:
► The JavaServer Page (JSP) index.jsp contains a form that starts the servlet
CTGTesterECIServlet. Several parameters are sent to the servlet: the name
of the CICS program to call, the encoding to use, and details of the Gateway
daemon, among others.
► The servlet makes the call to CICS using the ECIRequest class from the CICS
TG base classes. Once the call has completed, the servlet forwards the
results to one of three JSPs, depending on whether the request was
successful, an error occurred, or an exception occurred.
► The JSP formats and displays the results of the request.
This sample enterprise application is supplied in the file CTGTesterECI.ear. To
obtain this file, see Appendix C, “Additional material” on page 389.
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