Csse3002 Tuesday 2 For process modelling, Jeff the ninja - - PowerPoint PPT Presentation

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Csse3002 Tuesday 2 For process modelling, Jeff the ninja - - PowerPoint PPT Presentation

Dec 22, 2023 269 likes •808 views

Csse3002 Tuesday 2 For process modelling, Jeff the ninja recommends... Little-JIL Overview What is Little-JIL? Jared Why use Little-JIL? Douglas Interrupt if you have a question What is Little-JIL? Research at UMass

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Csse3002 Tuesday 2

For process modelling, Jeff the ninja recommends...

Little-JIL

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Overview

 What is Little-JIL?

 Jared

 Why use Little-JIL?

 Douglas

 Interrupt if you have a question

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What is Little-JIL?

 Research at UMass  Process modelling language  Co-ordination of agents  Formal semantics  Graphical representation

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Process modelling language

 Some formal languages are object-based

 UML, B  create abstract data types & methods  “what is an X, and what can you do with it?”

 Little-JIL is process-based

 break complex algorithms into pieces  “how do you do X, and who is involved?”

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Co-ordination of agents

 Co-ordination of agents

 scheduling of tasks  communication between agents

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Little-JIL process model

 Composed of steps  Steps are executed by agents  Steps have badges which labels are attached to

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Example

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Example

Pass Csse3002 agent:Jared

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Example

Pass Csse3002 agent:Jared Agent executing the step Step name

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Example

Pass Csse3002 agent:Jared

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Example

Pass Csse3002 Do assignment 3 Do essay agent:Jared

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Example

Pass Csse3002 Do assignment 3 Do essay Steps executed in parallel agent:Jared

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Example

Pass Csse3002 Do assignment 3 Do essay agent:Jared

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Example

Do assignment 3

Pass Csse3002 Do essay agent:Jared

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Example

Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Pass Csse3002 Do essay agent:Jared

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Example

Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence Sequential execution (left to right) Steps assigned to different agents

Pass Csse3002 Do essay agent:Jared

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Example

Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Pass Csse3002 Do essay agent:Jared

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Example

Do essay

Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

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Example

Do essay

Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Cheat Do it properly

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Example

Do essay

Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Cheat Do it properly Choose

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Example

Do essay

Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Cheat Do it properly

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Example

Do essay Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Cheat

Do it properly

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Example

Do essay Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Cheat

Do it properly

Copy from friend Bribe David Carrington

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Example

Do essay Pass Csse3002 agent:Jared Do assignment 3 Choose topic Write content agent:Douglas agent:Lawrence

Cheat

Do it properly

Copy from friend Bribe David Carrington T ry (execute sequentially until one succeeds)

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Example

Do essay Pass Csse3002 Choose topic Write content Do assignment 3 Copy from friend Bribe David Carrington Cheat Do it properly agent:Jared agent:Douglas agent:Lawrence

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Example

Do essay Pass Csse3002 Choose topic Write content Do assignment 3 Copy from friend Bribe David Carrington Cheat Do it properly

Value passed between steps

chosenT

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agent:Jared agent:Douglas agent:Lawrence

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Example

Do essay Pass Csse3002 Choose topic Write content Do assignment 3 Copy from friend Bribe David Carrington Cheat Do it properly chosenT

  • pic

agent:Jared agent:Douglas agent:Lawrence

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Example

Do essay Pass Csse3002 Choose topic Write content Do assignment 3 Copy from friend Bribe David Carrington Cheat x CantT akeItAnymore Do it properly

Exception declared

chosenT

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agent:Jared agent:Douglas agent:Lawrence

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Example

Do essay Pass Csse3002 Choose topic Write content Do assignment 3 Copy from friend Bribe David Carrington Cheat x CantT akeItAnymore Do it properly

Exception rethrown

↑CantT akeItAnymore chosenT

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agent:Jared agent:Douglas agent:Lawrence

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Example

Do essay Pass Csse3002 Choose topic Write content Do assignment 3 Copy from friend Bribe David Carrington Cheat x CantT akeItAnymore Do it properly

Exception handled

↑CantT akeItAnymore StudyArtsAtGriffith chosenT

  • pic

agent:Jared agent:Douglas agent:Lawrence

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Little-JIL features

 Co-ordination of agents

 scheduling of tasks  communication between agents

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Little-JIL features

 Co-ordination of agents  Already covered

 Step sequencing

 parallel  sequential  choose  try

 Parameter passing  Exception handling

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Little-JIL features

 Co-ordination of agents  Not yet covered

 step repetition  conditional execution  deadlines  pre-conditions & post-conditions  resource acquisition  communication between groups of agents

 multi-way  synchronous & asynchronous

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Little-JIL features

 Co-ordination of agents  Is this useful?

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Why?

 Why use Little-JIL?  Why use a process modelling language?

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Design goals

 Simplicity  Expressiveness  Precision  Flexibility

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Simplicity

 Graphical  No data types, data definition, calculation...

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Expressiveness

 ‘A picture is worth a thousand words’

  • Ole Canadian Proverb*

*Not actually Canadian

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Expressiveness

 ‘A picture is worth a thousand words’

Get drink agent:ThirstyPerson Get coke Get milk IsCold NotCold

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Precision

 Strict syntax & semantics

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Flexibility

 Any process can be described

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Little-JIL’s limitations

 Assumes agent knowledge

 Is this valid?

 Doesn’t get requirements  Doesn’t run testing  Doesn’t write code  So what’s the use??

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Possible uses

 Modelling The Software ProcessTM  Specification for system-wide process flows

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Modelling the software process

 Gantt chart & PERT chart & Little-JIL

 Concurrency  Dependencies  Time

 Little-JIL

 Better sequencing (choice & try)  Exceptions  Communication

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Software specification

 Combines good aspects of

 UML activity/collaboration/sequence diagrams

 Multi-agent  Communication

 Flowcharts

 Sequencing of steps  Decisions

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Software specification (cont)

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Software specification (cont)

Add action item agent:User Clear form Enter information x MaxItemsExceeded x InvalidName ✓ MaxItemsExceeded ↲ InvalidName

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Software specification (cont)

 Problems

 No data  No calculation

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Conclusion

 Can Little JIL help?

 Yes

 Good replacement for UML sequence, activity and

collaboration diagrams

 Good for explaining processes within software engineering

 But

 Relies on human interpretation  No data types  Relies on agent ability

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References

 Sutton, Lerner, & Osterweil “Experience using

the JIL process programming language to specify design processes” (1997)

 Sutton & Osterweil “The design of a next-

generation process language” (1997)

 Cass, Lerner, et al “Little-JIL/Juliette: a process

definition language and interpreter” (2000)

 LASER process working group “Little-JIL 1.5

language report” (2006)

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End of presentation