Data Transformation Engine Intelligent Business Integration Reference Guide

Chapter 3 - Methods of Execution Event-Driven Execution Model

Intelligent Business Integration Reference Guide

4 The map triggered by the HTTP request generates its output, which is passed

onto another map whose output may be passed onto another map, and so

forth. In all cases, the session ID assigned by the Event Agent is passed along

to each subsequent map in the form of a wildcard parameter. Once the

required output has been generated, Map N sends an HTTP request (including

the session ID originally assigned by the Event Agent) to the HTTP adapter and

passes, in that request, its output data to be returned in response to the

original HTTP request in step 2. The HTTP adapter forwards the HTTP request

to the Event Agent.

5 The Event Agent sends the data sent in the HTTP request in step 4 to the client

that made the original HTTP request in step 2. During the time the Event

Server has been executing the maps, the Event Agent has maintained state on

the original HTTP request.

6 The response returned by the output data for the original HTTP request sent in

step 5, is passed back as a response to the Event Server map that made the

HTTP request to the Event Agent in step 4. This in turn can be mapped and

updated as an additional output to a transaction-logging database.

When to use the Event Agent

♦ When the HTTP request requires a complex system of maps to generate the

response.

♦ If the integration is required to use asynchronous messaging.

♦ If a light-footprint solution is required to process internal and external HTTP

requests.

Business Advantages

♦ Single architecture for A2A, B2C, and B2B integration

! Greater re-usability and portability of skills

! No procedural programming

! Ease of ongoing maintenance

! Quicker implementation times

♦ Major platform support

! Leverage existing IT investments—technology & skills

! Reduced cost—no new skill sets needed

♦ Firewall integrity is maintained—no requirement to “punch a hole” into the

firewall from outside in the DMZ

! Threats to business security are minimized