Atomic Store Programming Topics.pdf

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1、AtomicStoreProgrammingTopicsContentsIntroductiontoAtomicStoreProgrammingTopics3OrganizationofThisDocument3AtomicStoreFundamentals4Introduction4AtomicStoreClasses4ImplementationRequirements5AtomicStoreLife-cycle7Registration7InitializationandLoadingData7InitializingtheStore7Lo

2、adingaFile8Zero-LengthFiles8ProcessingandSavingChanges9NewReferenceObjects9RemovalandDeallocation10RegisteringaCustomStoreType11InitializingaStoreandLoadingData12InitializingaStore12LoadingaFile12ReferenceData13ManagedObjectID13Cachenode13Example14DocumentRevisionHistory16201

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4、Copyright©2011AppleInc.AllRightsReserved.2IntroductiontoAtomicStoreProgrammingTopicsThisdocumentdescribeshowtousetheatomicstoreAPItocreatecustompersistentstoresforCoreDataapplications.YoushouldreadthisdocumentifyouwanttocreateaCoreDatapersistentstoreforwhichyoumanaget

5、hefileformat.Thisisnotanentry-levelsubject.YoumustbefamiliarwiththeCoreDataarchitecturedescribedin“CoreDataBasics”and“PersistentStoreFeatures”,andwiththedesignandimplementationofObjective-Cclasses.Youmustalsounderstandyourownfileformat,andhowtoread,parse,andwritethefilesyouwa

6、nttosupport.OrganizationofThisDocumentThisdocumentcontainsthefollowingarticles:●“AtomicStoreFundamentals”(page4)describesthefundamentalconceptsthatunderlytheatomicstore.●“AtomicStoreLife-cycle”(page7)describesthelife-cycleofanatomicstore.Youshouldreadthisarticletolearnwhatmet

7、hodsareinvokedonastorewhen,andwhatthestoreisexpectedtodoasaresult.Thiswillhelpyoutounderstandhowtoimplementacustomstore.●“RegisteringaCustomStoreType”(page11)describeshowtoregisteracustomatomicstoretype.●“InitializingaStoreandLoadingData”(page12)describeshowinitializeandloadd

8、ataintoacustomatomicstore.2011-10-12

9、Copyright©2011AppleInc.AllRightsReserved.3AtomicStoreFundamentalsThisarticledescribesthefundamentalconceptsthatunderlytheatomicstore.IntroductionCoreDataprovidesfournativetypesofpersistentstore:●SQLite●Binary●XML●In-MemoryThesestoretypesea

10、chofferdifferentbenefitsandtradeoffs,andaredescribedin“PersistentSto