Data Transformation Engine Intelligent Business Integration Reference Guide

Chapter 3 - Methods of Execution Servlet Execution Model

Intelligent Business Integration Reference Guide

This approach has been successfully employed in a number of implementations, in

particular, to provide the capability to Web-enable legacy applications. The

powerful transformation and connectivity capabilities of Mercator products provide

the application connectivity. Utilization of the automatically generated servlet

exposes the power of this application integration capability to the Web.

The servlet generated by the Servlet Integrator utilizes the Mercator Java API,

which in turn instantiates the maps via the native Mercator Platform API function

libraries. In essence, the mechanism that is used is the same as for providing the

runtime instructions for a map’s execution from the command prompt—overrides

are submitted to control the map’s execution. The difference is that these

overrides are supplied programmatically, in memory, rather than on the command

line. However, even under Command Server execution, the overrides specified on

the command line are passed by the Command Server, in memory, to the core

execution code, which is embodied in the Platform API. Note that whichever

execution model is employed, the same underlying Mercator technology prevails.

Servlet Integrator

The Servlet Integrator is a stand-alone, Java-based graphical wizard tool for

generating Java servlets that enable you to expose maps to the Web using a third-

party Web or application server that has a servlet engine available (such as

Internet Information Server (IIS) or IBM WebSphere).

The Servlet Integrator enables you to:

♦ Select one or more maps to expose to the Internet (HTTP)

♦ Configure map-related options for the selected map(s); for example, retry,

trace, and audit settings

♦ Generate a servlet to one or more target directories within the Web or

application server and servlet space

♦ Execute the servlet using standard HTTP

POST or GET syntax to invoke the

corresponding map

Note Refer to the Mercator Integration for Java Reference Guide for more information.

Using the Servlet Integrator

The Servlet Integrator guides the user through the following process of tailoring

and generating servlets to execute maps:

♦ Associating servlets with compiled map files

♦ Specifying details for compiling Java servlet class files