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1、OSGiandEquinoxCreatingHighlyModularJavaSystemsPartI:IntroductionThisfirstpartofthebookintroducesOSGiandEquinox,Eclipse’simplementationoftheOSGistandard.Chapter1outlinesthehistoryandcontextofOSGi.Itsusefulnessandapplicabilityareillustratedwithreal-worldexam
2、plesofOSGiandEquinoxinaction.Chapter2givesanoverviewofOSGiconcepts,terminology,andarchitecturetoensurethatallreadershaveacommonunderstanding.Chapter1.OSGi,Equinox,andEclipseAsthisbookgoestopress,bothOSGiandEclipsearecelebratingtheirtenthbirthdaysasJavatech
3、nologies.Thoughtheyweredevelopedindependentlyincompletelydifferentdomains,theirlineagecanbetracedbacktoteamsinthesameorganizationwithasimilarneedtoprovidecomponentizedJavasolutions.InthecaseofOSGiitwashomegatewaysandset-topboxes.ForEclipse,thatneedwasinthe
4、toolingspace.Both,however,hadverysimilarneedsformodularityandextensibility.InthisfirstchapterofabookdedicatedtoOSGiandEquinox,welookatsomeofthehistorybehindthesetechnologies,howtheyareused,whattheyaregoodfor,andwhattheycandoforyou.1.1.ABitofHistoryForthefi
5、rstfewyears,OSGiandEclipsetechnologiesgrewupinparallelwithonlyafewpassingencounters.TheOSGiorganizationwasalooseconsortiumofembeddedandhomegatewayvendors.Itsmodularruntimespecificationsevolvedquicklywithseveralmajorrevisions,newservices,andexpertgroupsindi
6、fferentdomains,particularlyvehiclesoftware.Adoptionrampedup,andmoreandmoreframeworkimplementationsappeared.TheOSGicommunitymaintaineditsfocusontheembeddedmarket,andthoseneedscontinuedtobereflectedinconciseandhonedAPIsanddesign.Atthesametime,Eclipsewasaloos
7、econsortiumofsoftwaretoolvendorslookingtocreateacomprehensivetoolingplatform.Itstechnologywasmaturingandquicklydominatingthetoolingmarket.Eclipse-basedofferingswiththousandsofcomponentswereshippingasflagshipproductsfrommajorsoftwarecompanies.Modularityandt
8、heopencommunity,twokeyingredients,wereworkingasapowerfulpairtodrivearevolutioninthetoolingworld.Eclipsealsobegantoreachbeyondtoolsandintorichclientapplications.Thisshiftdrovetheneedforamorerobustmodularitymec
