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Chapter XII. Temporalities for Workflow ... > TEMPORALITIES IN EXPECTED EXCEPTIONS

TEMPORALITIES IN EXPECTED EXCEPTIONS

During the normal execution of processes, several exceptions may occur (Eder & Liebhart, 1995) such as hardware, software, network, or power failures, to mention few of them. Some of these exceptions are not strictly related to the process we consider and enacted by the WfMS, even if the effects of the occurrence of such exceptions are relevant over the considered process. On the other hand, other exceptions are strictly related to the considered process, and they can be modeled within the process itself: we refer to these exceptions by the term of "expected exception" (Eder et al., 1999). The semantics of these exceptions is not negligible, for a correct execution of the process.

Expected exceptions are classified according to the respective triggering event (Casati et al., 1999); after an event has been detected, a related condition can be checked and, in case, the specified action can be executed, typically to manage the exception or to inform an agent about its occurrence. Exceptions can be described by triggers (also known as rules) according to the ECA paradigm: whenever an E xception occurs (i.e. the trigger is fired), a C ondition is checked and, possibly, the A ction is executed. Triggering events can be: data event (e.g., a change in a workflow variable); workflow event (e.g., the start or completion of a task instance or of a case); external event (e.g., the customer calling to cancel his/her reservation); temporal event (e.g., on February 19th, 2008 at 4:56 p.m.). We focus here on temporal events.


  

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