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Thursday, 23 May 2013 03:36

Pattern TP3: Time Lags between Arbitrary Events

This pattern allows defining time lags between two activities; i.e., to express a minimum or maximum temporal distance between them.

Also known as

Problem

A time lag between two discrete events needs to be obeyed. Respective events occur, for example, when instantiating or completing a process instance, when reaching a milestone in a process instance, or when triggering specific events inside an activity.

Design Choices

D There are three kinds of restrictions
a Minimum value
b Maximum value
c Time interval [min … max]

TimeLagsEventsSolution

A time constraint is introduced between two events.

Again timers can be used to realize this pattern at run-time (cf. TP1). Additionally, an observer, monitoring external events and notifying the time management component, is required.

Context

The mechanism evaluating the constraint (i.e., starting the timer) needs to be able to access the value of the time lag prior to its activation (i.e., the occurrence of the start event) in order to start the respective timer.

Examples

  • The time lag between the delivery of all parts (milestone) and the assembly of the car’s chassis (milestone) should be no more than 2 hours (e.g. just-in-time production) (Design Choices D[b]).
  • The time lag between two heavy maintenance visits of an aircraft is 4-5 years (Design Choice D[c])

Related Patterns

Animation

Product Evaluation

We differentiate between supported, partially supported, not supported and not specified.
If an evaluation object provides support for the particular pattern the supported design choices are listed. If the pattern is only partially supported (e.g., by a work-around) this is indicated by the additional label "*" and if support is not specified this is indicated by the label "?". Missing support is labeled with "-".

Product/Language Version Score Motivation
Microsoft Outlook 2010 No events supported
Sunbird 1.0 No events supported
Google Calendar 12.2011 No events supported
Microsoft Project 2010 not supported
BPMN 2.0 D[a,b*,c*] mainly supported (through work-around)
IBM Websphere Integration Developer 6.1 not supported
MQ Workflow 3.4? No support of Events
WebSphere Lombardi Edition 7.1 D[a*] partially supported
AristaFlow 1.0.1 No event concept
Intalio 6.0.3 D[a] not supported
TIBCO Business Studio 3.4.2 D[a,b*,c*] mainly supported (through work-arounds)
Bettini et al. D[a,b,c] fully supported
Combi et al. D[a*,b*,c*] Time Lags are only supported between events an the events of an activity not between arbitrary events.
Eder et al. not supported
Marjanovic et al. Events are not supported
Zhuge et al. events are not supported
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Involved Partners

andreaslanz 50

 

Andreas Lanz
University of Ulm, Institute of Databases and Information Systems

 

 

manfredreichert 50

Manfred Reichert
University of Ulm, Institute of Databases and Information Systems

 

 

barbaraweber 50

Barbara Weber
University of Innsbruck, Department of Computer Science

 

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Important Publications

Lanz, A. and Weber, B. and Reichert, M. (2012) Time patterns for process-aware information systems.Requirements Engineering.

 

Lanz, A. and Weber, B. and Reichert, M. (2010) Workflow Time Patterns for Process-aware Information Systems. In: BPMDS'10.