Examples of org.neo4j.kernel.impl.transaction.LockManager

Package org.neo4j.kernel.impl.transaction

Examples of org.neo4j.kernel.impl.transaction.LockManager

org.neo4j.kernel.impl.transaction.LockManager
The LockManager can lock resources for reading or writing. By doing this one may achieve different transaction isolation levels. A resource can for now be any object (but null).
When acquiring a lock you have to release it. Failure to do so will result in the resource being blocked to all other transactions. Put all locks in a try - finally block.
Multiple locks on the same resource held by the same transaction requires the transaction to invoke the release lock method multiple times. If a tx has invoked getReadLock on the same resource x times in a row it must invoke releaseReadLock x times to release all the locks.
LockManager just maps locks to resources and they do all the hard work together with a resource allocation graph.

            TxIdGeneratorFactory txIdFactory, TxFinishHook finishHook,
            LastCommittedTxIdSetter lastCommittedTxIdSetter, FileSystemAbstraction fileSystem )
    {
        this.storeDir = storeDir;
        TxModule txModule = newTxModule( inputParams, finishHook );
        LockManager lockManager = lockManagerFactory.create( txModule );
        LockReleaser lockReleaser = new LockReleaser( lockManager, txModule.getTxManager() );
        final Config config = new Config( graphDbService, storeDir, storeId, inputParams,
                kernelPanicEventGenerator, txModule, lockManager, lockReleaser, idGeneratorFactory,
                new SyncHookFactory(), relTypeCreator, txIdFactory.create( txModule.getTxManager() ),
                lastCommittedTxIdSetter, fileSystem );

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        @Override
        protected Void executeInTransaction( GraphDatabaseService db, Transaction tx )
        {
            Config config = getConfig( db );
            LockManager lockManager = config.getLockManager();
            LockReleaser lockReleaser = config.getLockReleaser();
            for ( int i = 0; i < amount; i++ )
            {
                Object resource = new LockableNode( i );
                lockManager.getWriteLock( resource );
                lockReleaser.addLockToTransaction( resource, LockType.WRITE );
            }
            return null;
        }

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    private void initializeStores() throws IOException
    {
        try
        {
            LockManager lockManager = getEmbeddedGraphDb().getConfig()
                .getLockManager();
            LockReleaser lockReleaser = getEmbeddedGraphDb().getConfig()
                .getLockReleaser();
            
            ds = new NeoStoreXaDataSource( MapUtil.genericMap(

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    {
        return new LockManagerFactory()
        {
            public LockManager create( TxModule txModule )
            {
                return new LockManager( txModule.getTxManager() );
            }
        };
    }

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            LockGrabber lockGrabber, T... entities )
    {
        Transaction otherTx = suspendOtherAndResumeThis( context );
        try
        {
            LockManager lockManager = graphDbConfig.getLockManager();
            LockReleaser lockReleaser = graphDbConfig.getLockReleaser();
            for ( T entity : entities )
            {
                lockGrabber.grab( lockManager, lockReleaser, entity );
            }

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Related Classes of org.neo4j.kernel.impl.transaction.LockManager

org.neo4j.kernel.CommonFactories

org.neo4j.kernel.EmbeddedGraphDbImpl

org.neo4j.kernel.ha.MasterImpl

org.neo4j.kernel.impl.nioneo.store.TestNeoStore

slavetest.CommonJobs$PerformanceAcquireWriteLocksJob

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