CLIC a Component Model Symbiotic with Smalltalk N. Bouraqadi and - - PowerPoint PPT Presentation
CLIC! + CLIC a Component Model Symbiotic with Smalltalk N. Bouraqadi and L. Fabresse Ecole des Mines de Douai http://vst.ensm-douai.fr/Clic 2 Software Engineering Virtuous Circle Programming Language N. Bouraqadi & L. Fabresse -
Ecole des Mines de Douai http://vst.ensm-douai.fr/Clic
+ CLIC!
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Programming Language Good Practices
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– Design drawings – Comments
– Inversion of control – Use of design patterns such as Observer
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– Code change not reflected in documentation
– Dependencies hidden inside methods
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– Documentation – Loose Coupling
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– Part of the software
– Implemented or picked out of some library
– According to the architecture
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a piece of software
– Standalone or not
self-documented
– Requirements / Dependencies – Provided services – Parameters – Architecture
easy to deploy
– Explicit connections to the rest of the software
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– Objects = building blocks for components
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language
– No objects – Ex: SCL
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U n i f y d e s i g n a n d c
e P e r f
m a n c e R e u s e O O c
e E a s y t
m p l e m e n t Object-based Pure components
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U n i f y d e s i g n a n d c
e P e r f
m a n c e R e u s e O O c
e E a s y t
m p l e m e n t
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– Can be used by objects
– Can be connected to components – Possibly with implicit / tight dependencies
– Same performances
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Single Provided Port
… + + + …
C3 C4 C5
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C1 C2
Simple Required Ports Collection Required Ports
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Attributes Assembly
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– 1 attribute => 1 collection required port
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count count: anInt increment decrement
+ 12 countObservers port count attribute
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CLComponent subclass: #Counter localPrivateAttributeNames: #(count) privateAttributesInitDict: { #count -> 0} sharedAttributeNames: #() sharedAttributesInitDict: {} localRequiredPortsDict: {} category: #'ClicExamples-Clock'
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CLComponent subclass: #Counter localPrivateAttributeNames: #(count) privateAttributesInitDict: { #count -> 0} sharedAttributeNames: #() sharedAttributesInitDict: {} localRequiredPortsDict: {} category: #'ClicExamples-Clock'
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CLComponent subclass: #Counter localPrivateAttributeNames: #(count) privateAttributesInitDict: { #count -> 0} sharedAttributeNames: #() sharedAttributesInitDict: {} localRequiredPortsDict: {} category: #'ClicExamples-Clock'
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CLComponent subclass: #Counter localPrivateAttributeNames: #(count) privateAttributesInitDict: { #count -> 0} sharedAttributeNames: #() sharedAttributesInitDict: {} localRequiredPortsDict: {} category: #'ClicExamples-Clock'
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Counter >> increment self count: self count + 1 Counter >> decrement self count: self count - 1
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|myCounter| myCounter := Counter new. myCounter increment. Transcript cr; show: myCounter count
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counter ticker reset start stop seconds
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counter ticker count: 0 reset receiveEvent: method lookup & evaluation
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counter ticker increment start receiveEvent: start
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counter ticker seconds count
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CLComponent subclass: #StopWatch localPrivateAttributeNames: #(counter ticker) privateAttributesInitDict: { #counter -> Counter @ #new. #ticker -> GenericTicker @ #new} …
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… sharedAttributeNames: #(Scheduler) sharedAttributesInitDict: { #Scheduler -> Processor} …
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… architectureFrom: { (#ticker @ #notifiedComponents) => #counter}; …
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…
#counter @ #(count) -> #(seconds). #ticker @ #(start stop)}; …
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… exportedRequiredPortsDictFrom: { #counter @ #(countObservers)
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StopWatch>>reset self counter count: 0 StopWatch>>initialize super initialize. self ticker tickSelector: #increment; stepDelayDuration: 1000; processPriority: self Scheduler timingPriority.
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good practices
– Documentation
– Loose coupling
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symbiosis
– Easy implementation
– Components as first class entities – Same run-time => Same performance – Ability to use objects ("dirty" components)
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Ecole des Mines de Douai http://vst.ensm-douai.fr/Clic
+ CLIC!