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1、COORDINATINGCOMPONENTSINTHEMULTIMEDIASYSTEMSERVICESARCHITECTURE†TheophilosA.Limniotes,GeorgeA.PapadopoulosDepartmentofComputerScienceUniversityofCyprus75KallipoleosSt,Nicosia,POB20537,CY-1678,CYPRUSTel:+357-2-892242,Fax:+357-2-339062{theo,george}@cs.ucy.ac.cyABSTRACTThepurposeo
2、fthisworkistoexamineandexploitthepotentialofthecoordinationparadigmtoactasthemaincommunicationandsynchronizationmechanismbetweencomponentsformingadistributedmultimediaenvironmentandexhibitingreal-timeproperties.Towardsthispurpose,wehavedevelopedamechanismforcoordinatingthedistr
3、ibutedexecutionofcomponents,asthesearedefinedbytheMultimediaSystemServicesArchitecture(MSSA).Ourcoordinationenvironmentusesthecontrol-drivenapproachtocoordination,namelythemodelIWIMandtheassociatedlanguageManifold.IntheprocessweshowhowManifoldcanbeusedtorealizeobjectcommunicati
4、onandsynchronizationofMSSAcomponentsandwepresentamethodologyofcombiningasoftwarearchitecturesuchasMSSAwithacoordinationlanguagesuchasManifold.Weillustrateourapproachbymeansofasuitableexample.Keywords:CoordinationParadigm;DistributedMultimediaSystems;Component-BasedSystems;Real-
5、TimeSystems.1.INTRODUCTIONOneofthemostimportantdevelopmentsincontemporarySoftwareEngineeringforDistributedSystemsisthatofcomponent-basedsystems.Towardsthatend,wehaveseenaproliferationofmodelssupportingthedevelopmentofcomponent-basedsoftware,suchasmiddlewareplatforms,softwarearc
6、hitectures,coordinationmodelsandlanguages,etc.Thepurposeofthisworkistoexploreandexploitthepotentialofthecoordinationparadigmtoactasthecommunicationandsynchronizationmechanismbetweencomponentsformingadistributedmultimediaenvironmentandexhibitingreal-timeproperties.Weareparticula
7、rlyinterestedintwospecificenvironments:theMultimediaSystemServicesArchitecture(HewlettPackard,1994),asoftwarearchitectureframeworkforDistributedMultimediaenvironmentsproposedbysomemajorcompaniesinthefield;andthecoordinationlanguageManifold(Arbab,1996;Arbabetal.,1998)whichbelong
8、stothecontrol-orevent-drivencategoryofcoordinationmode
