Book Image

Mastering jBPM6

By : Simone Fiorini, Arun V Gopalakrishnan
Book Image

Mastering jBPM6

By: Simone Fiorini, Arun V Gopalakrishnan

Overview of this book

Table of Contents (18 chapters)
Mastering jBPM6
About the Authors
About the Reviewers

Custom process nodes

In Chapter 5, BPMN Constructs, we introduced the jBPM feature that lets you bind specific Java class implementations to the execution of a specific process task node type: send/receive tasks, service tasks, and ad hoc tasks.

These kinds of extensible task nodes are often called custom workitems, and the implementing classes that perform the horse work behind the process curtains are called workitem handlers. This architecture makes jBPM more flexible when it comes to adapting the engine to a particular domain, both in terms of features and tools UI. Let's start by reviewing the basics of the jBPM workitem and handlers.

Workitem and handlers

jBPM defines a work item as a unit of work that is defined inside the scope of a process but can be executed outside the engine; in particular:

  • It accepts a set of parameters

  • It performs some action

  • It optionally returns a result

The workitem is just an abstract definition of a work unit and has several concrete, practical implementations...