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Store Git on any DHT jgit.storage.dht is a storage provider implementation for JGit that permits storing the Git repository in a distributed hashtable, NoSQL system, or other database. The actual underlying storage system is undefined, and can be plugged in by implementing 7 small interfaces: * Database * RepositoryIndexTable * RepositoryTable * RefTable * ChunkTable * ObjectIndexTable * WriteBuffer The storage provider interface tries to assume very little about the underlying storage system, and requires only three key features: * key -> value lookup (a hashtable is suitable) * atomic updates on single rows * asynchronous operations (Java's ExecutorService is easy to use) Most NoSQL database products offer all 3 of these features in their clients, and so does any decent network based cache system like the open source memcache product. Relying only on key equality for data retrevial makes it simple for the storage engine to distribute across multiple machines. Traditional SQL systems could also be used with a JDBC based spi implementation. Before submitting this change I have implemented six storage systems for the spi layer: * Apache HBase[1] * Apache Cassandra[2] * Google Bigtable[3] * an in-memory implementation for unit testing * a JDBC implementation for SQL * a generic cache provider that can ride on top of memcache All six systems came in with an spi layer around 1000 lines of code to implement the above 7 interfaces. This is a huge reduction in size compared to prior attempts to implement a new JGit storage layer. As this package shows, a complete JGit storage implementation is more than 17,000 lines of fairly complex code. A simple cache is provided in storage.dht.spi.cache. Implementers can use CacheDatabase to wrap any other type of Database and perform fast reads against a network based cache service, such as the open source memcached[4]. An implementation of CacheService must be provided to glue this spi onto the network cache. [1] https://github.com/spearce/jgit_hbase [2] https://github.com/spearce/jgit_cassandra [3] http://labs.google.com/papers/bigtable.html [4] http://memcached.org/ Change-Id: I0aa4072781f5ccc019ca421c036adff2c40c4295 Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2011-03-03 01:23:30 +02:00
#FindBugs User Preferences
#Mon May 04 16:24:13 PDT 2009
detectorAppendingToAnObjectOutputStream=AppendingToAnObjectOutputStream|true
detectorBadAppletConstructor=BadAppletConstructor|false
detectorBadResultSetAccess=BadResultSetAccess|true
detectorBadSyntaxForRegularExpression=BadSyntaxForRegularExpression|true
detectorBadUseOfReturnValue=BadUseOfReturnValue|true
detectorBadlyOverriddenAdapter=BadlyOverriddenAdapter|true
detectorBooleanReturnNull=BooleanReturnNull|true
detectorCallToUnsupportedMethod=CallToUnsupportedMethod|true
detectorCheckImmutableAnnotation=CheckImmutableAnnotation|true
detectorCheckTypeQualifiers=CheckTypeQualifiers|true
detectorCloneIdiom=CloneIdiom|false
detectorComparatorIdiom=ComparatorIdiom|true
detectorConfusedInheritance=ConfusedInheritance|true
detectorConfusionBetweenInheritedAndOuterMethod=ConfusionBetweenInheritedAndOuterMethod|true
detectorCrossSiteScripting=CrossSiteScripting|true
detectorDoInsideDoPrivileged=DoInsideDoPrivileged|true
detectorDontCatchIllegalMonitorStateException=DontCatchIllegalMonitorStateException|true
detectorDontUseEnum=DontUseEnum|true
detectorDroppedException=DroppedException|true
detectorDumbMethodInvocations=DumbMethodInvocations|true
detectorDumbMethods=DumbMethods|true
detectorDuplicateBranches=DuplicateBranches|true
detectorEmptyZipFileEntry=EmptyZipFileEntry|true
detectorEqualsOperandShouldHaveClassCompatibleWithThis=EqualsOperandShouldHaveClassCompatibleWithThis|true
detectorFinalizerNullsFields=FinalizerNullsFields|true
detectorFindBadCast2=FindBadCast2|true
detectorFindBadForLoop=FindBadForLoop|true
detectorFindCircularDependencies=FindCircularDependencies|false
detectorFindDeadLocalStores=FindDeadLocalStores|true
detectorFindDoubleCheck=FindDoubleCheck|true
detectorFindEmptySynchronizedBlock=FindEmptySynchronizedBlock|true
detectorFindFieldSelfAssignment=FindFieldSelfAssignment|true
detectorFindFinalizeInvocations=FindFinalizeInvocations|true
detectorFindFloatEquality=FindFloatEquality|true
detectorFindHEmismatch=FindHEmismatch|true
detectorFindInconsistentSync2=FindInconsistentSync2|true
detectorFindJSR166LockMonitorenter=FindJSR166LockMonitorenter|true
detectorFindLocalSelfAssignment2=FindLocalSelfAssignment2|true
detectorFindMaskedFields=FindMaskedFields|true
detectorFindMismatchedWaitOrNotify=FindMismatchedWaitOrNotify|true
detectorFindNakedNotify=FindNakedNotify|true
detectorFindNonSerializableStoreIntoSession=FindNonSerializableStoreIntoSession|true
detectorFindNonSerializableValuePassedToWriteObject=FindNonSerializableValuePassedToWriteObject|true
detectorFindNonShortCircuit=FindNonShortCircuit|true
detectorFindNullDeref=FindNullDeref|true
detectorFindNullDerefsInvolvingNonShortCircuitEvaluation=FindNullDerefsInvolvingNonShortCircuitEvaluation|true
detectorFindOpenStream=FindOpenStream|true
detectorFindPuzzlers=FindPuzzlers|true
detectorFindRefComparison=FindRefComparison|true
detectorFindReturnRef=FindReturnRef|true
detectorFindRunInvocations=FindRunInvocations|true
detectorFindSelfComparison=FindSelfComparison|true
detectorFindSelfComparison2=FindSelfComparison2|true
detectorFindSleepWithLockHeld=FindSleepWithLockHeld|true
detectorFindSpinLoop=FindSpinLoop|true
detectorFindSqlInjection=FindSqlInjection|true
detectorFindTwoLockWait=FindTwoLockWait|true
detectorFindUncalledPrivateMethods=FindUncalledPrivateMethods|true
detectorFindUnconditionalWait=FindUnconditionalWait|true
detectorFindUninitializedGet=FindUninitializedGet|true
detectorFindUnrelatedTypesInGenericContainer=FindUnrelatedTypesInGenericContainer|true
detectorFindUnreleasedLock=FindUnreleasedLock|true
detectorFindUnsatisfiedObligation=FindUnsatisfiedObligation|true
detectorFindUnsyncGet=FindUnsyncGet|true
detectorFindUselessControlFlow=FindUselessControlFlow|true
detectorFormatStringChecker=FormatStringChecker|true
detectorHugeSharedStringConstants=HugeSharedStringConstants|true
detectorIDivResultCastToDouble=IDivResultCastToDouble|true
detectorIncompatMask=IncompatMask|true
detectorInconsistentAnnotations=InconsistentAnnotations|true
detectorInefficientMemberAccess=InefficientMemberAccess|false
detectorInefficientToArray=InefficientToArray|true
detectorInfiniteLoop=InfiniteLoop|true
detectorInfiniteRecursiveLoop=InfiniteRecursiveLoop|true
detectorInfiniteRecursiveLoop2=InfiniteRecursiveLoop2|false
detectorInheritanceUnsafeGetResource=InheritanceUnsafeGetResource|true
detectorInitializationChain=InitializationChain|true
detectorInstantiateStaticClass=InstantiateStaticClass|true
detectorInvalidJUnitTest=InvalidJUnitTest|true
detectorIteratorIdioms=IteratorIdioms|true
detectorLazyInit=LazyInit|true
detectorLoadOfKnownNullValue=LoadOfKnownNullValue|true
detectorMethodReturnCheck=MethodReturnCheck|true
detectorMultithreadedInstanceAccess=MultithreadedInstanceAccess|true
detectorMutableLock=MutableLock|true
detectorMutableStaticFields=MutableStaticFields|true
detectorNaming=Naming|true
detectorNumberConstructor=NumberConstructor|true
detectorOverridingEqualsNotSymmetrical=OverridingEqualsNotSymmetrical|true
detectorPreferZeroLengthArrays=PreferZeroLengthArrays|true
detectorPublicSemaphores=PublicSemaphores|false
detectorQuestionableBooleanAssignment=QuestionableBooleanAssignment|true
detectorReadReturnShouldBeChecked=ReadReturnShouldBeChecked|true
detectorRedundantInterfaces=RedundantInterfaces|true
detectorRepeatedConditionals=RepeatedConditionals|true
detectorRuntimeExceptionCapture=RuntimeExceptionCapture|true
detectorSerializableIdiom=SerializableIdiom|true
detectorStartInConstructor=StartInConstructor|true
detectorStaticCalendarDetector=StaticCalendarDetector|true
detectorStringConcatenation=StringConcatenation|true
detectorSuperfluousInstanceOf=SuperfluousInstanceOf|true
detectorSuspiciousThreadInterrupted=SuspiciousThreadInterrupted|true
detectorSwitchFallthrough=SwitchFallthrough|true
detectorSynchronizeAndNullCheckField=SynchronizeAndNullCheckField|true
detectorSynchronizeOnClassLiteralNotGetClass=SynchronizeOnClassLiteralNotGetClass|true
detectorSynchronizingOnContentsOfFieldToProtectField=SynchronizingOnContentsOfFieldToProtectField|true
detectorURLProblems=URLProblems|true
detectorUncallableMethodOfAnonymousClass=UncallableMethodOfAnonymousClass|true
detectorUnnecessaryMath=UnnecessaryMath|true
detectorUnreadFields=UnreadFields|true
detectorUseObjectEquals=UseObjectEquals|false
detectorUselessSubclassMethod=UselessSubclassMethod|false
detectorVarArgsProblems=VarArgsProblems|true
detectorVolatileUsage=VolatileUsage|true
detectorWaitInLoop=WaitInLoop|true
detectorWrongMapIterator=WrongMapIterator|true
detectorXMLFactoryBypass=XMLFactoryBypass|true
detector_threshold=2
effort=default
excludefilter0=findBugs/FindBugsExcludeFilter.xml
filter_settings=Medium|BAD_PRACTICE,CORRECTNESS,MT_CORRECTNESS,PERFORMANCE,STYLE|false
filter_settings_neg=MALICIOUS_CODE,NOISE,I18N,SECURITY,EXPERIMENTAL|
run_at_full_build=true