Model-Driven Evolution of Software Architectures - Software and ...
Model-Driven Evolution of Software Architectures - Software and ...
Model-Driven Evolution of Software Architectures - Software and ...
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6.5. Mappings<strong>and</strong><strong>Model</strong>Transformations 117<br />
PlayerControl<br />
DiskReader ArmControl<br />
DataSensor SpeedSensor TrackSensor TransMotor<br />
Play<br />
DiscReader<br />
DataSensor<br />
TrackSensor<br />
(a)Architecture<br />
PlayerControl<br />
ArmControl<br />
TransMotor<br />
(b)Implementation<br />
OutputControl<br />
NotePlayer<br />
Figure 6.7:ReconstructedMADLmodels<br />
casewealsoassumethatsuchclassesareinstantiatedonlyonce. Therefore,thefirsttransformationstepidentifiestheseclassesintheJavaML<br />
model. For each we create a Process component in the CPADL target<br />
model. Notethatbecauseinthiscasethereexistsaone-to-onemapping<br />
betweenanimplementationconstruct(Javathread)<strong>and</strong>thecomponentsin<br />
acommunicating-processesview,itisnotnecessarytorelyonannotations<br />
asforthemoduleview.<br />
Inaddition,wesearchinthefirsttransformationstepfortwotypes<br />
<strong>of</strong>interactions:messagepassing<strong>and</strong>shared-data. Thesetypes<strong>of</strong>connectorswereimplementedusingmethodinvocations<strong>and</strong>Javastreams,respectively.<br />
Foridentification<strong>of</strong>therelevantmethodinvocationswelargelyreuse<br />
theATLexpressionsforthepopulation<strong>of</strong>theMADLmodel. Onlynowwe<br />
justconsidermethodinvocationsbetweenidentifiedthreads.ForeachdistinctmethodinvocationbetweentwothreadswecreateaMessageconnector,<strong>and</strong>,ontheside<strong>of</strong>thesource<strong>of</strong>themessage,an<br />
OutputPortforthe<br />
involvedcomponent<strong>and</strong>aSinkRolefortheconnector;atthe‘targetside’we<br />
createan InputPort<strong>and</strong>aSourceRole.Finally,wecreate Attachmentsforthose<br />
ports<strong>and</strong>roles.
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