The Worklet Service

Abstract

This chapter discusses the implementation and use of the Worklet Service (a conceptual overview of the service can be found in Chaps. 4 and 5). The Worklet Service has been implemented as a YAWL Custom Service (cf. Chap. 7). In the discussion that follows, a reference to the “Worklet Service” applies to the entire Custom Service, while a reference to the “Selection Service” or the “Exception Service” applies to that particular subcomponent of the service. All of the worklet processmodels in this chapter are expressed using YAWL notation – the language is used to model static YAWL processes, and the worklets used both for selection and exception compensations – thus, all worklet specifications are examples of standard, complete YAWL process models. The Worklet Service comprises two discrete but complementary subservices: a Selection Service, which enables dynamic flexibility for process instances, and an Exception Service, which provides facilities to handle both expected and unexpected process exceptions (i.e., events and occurrences that may happen during the life of a parent process instance that are not explicitly modeled) at runtime.