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Invoking a service from a task API event handler in WebSphere Process Server V7

Samir Nasser (snasser@us.ibm.com), Senior Managing Consultant, Certified IT Specialist, IBM

Samir Nasser is a Senior Managing Consultant and Certified IT Specialist with the IBM Software Services for WebSphere team in Durham, North Carolina. He is currently architecting and developing SOA solutions based on the WebSphere family of products.

Summary: WebSphere® Process Server supports different types of human tasks. Each task type has a lifecycle with well-defined states, which emit events to signal the occurrence of such states. This tutorial shows how to create a task API event handler and how to invoke a service from the handler.

Date: 28 Sep 2011
Level: Intermediate
PDF: A4 and Letter (292 KB | 10 pages)Get Adobe® Reader®

Activity: 12381 views
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About this tutorial

Many long-running processes with human tasks must execute one or more service for each human task. One way to do this is to model the service invocation activities in parallel with human task activities in a process model. However, this approach has two drawbacks:

The process model can easily become cluttered.
It only implements one business requirement scenario where service invocation occurs in parallel with a human task creation.

WebSphere Process Server provides the task API event handler mechanism that enables you to execute any kind of logic, including a service invocation at the various task states (not just when the task is created). This tutorial demonstrates this capability of WebSphere Process Server.

Objectives

You will learn to create a task API event handler and to invoke certain services from the handler.

Prerequisites

You need to be familiar with WebSphere Integration Developer V7.0.0.3.

System requirements

You need a machine with at least 2 GB of physical memory.

Duration

This tutorial takes about 1 hour to complete.

Download file

There is one project interchange file listed in the Download section of the tutorial: PI_Final.zip.

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