Patterns: Implementing Self-Service in an SOA Environment

Chapter 7. Application and system design guidelines 195

򐂰 ResourceException extends java.lang.Exception. It consists of a string

describing the error, a specific error code, and a reference to another

exception.

򐂰 ResourceWarning provides information about the warnings related to the

interactions with the EIS system.

7.4.6 CICS resource adapters

The CICS Transaction Gateway (CICS TG) is a set of client and server software

components that allows a Java application to invoke services in a CICS region.

The Java application can be a servlet, an enterprise bean, or any other Java

application.

The CICS Transaction Gateway (Figure 7-24) consists of the following

components:

򐂰 The gateway daemon is a long-running process that acts as a server for

network-attached Java applications.

򐂰 The client daemon provides client-server connectivity.

򐂰 The configuration tool provides a graphical interface for configuring the client

and the gateway daemon.

򐂰 The terminal servlet that allows you to use a Web browser as an emulator for

a 3270 CICS application.

򐂰 A Java class library containing the three basic interfaces: ECI, EPI, ESI.

Figure 7-24 CICS Transaction Gateway

ctgcfg

Java Client

Application

HTTP

or

TCP

CICS Transaction

Gateway

JNI

ECI EPI ESI

Client

Daemon

Transport Drivers

Network

Configuration

Tool

CICS

Server

Gateway

Daemon

CTG.INI