org.neo4j.kernel.ha.lock

Class SlaveStatementLocks

java.lang.Object

org.neo4j.kernel.ha.lock.SlaveStatementLocks

All Implemented Interfaces:

AutoCloseable, org.neo4j.kernel.impl.locking.StatementLocks

public class SlaveStatementLocks
extends Object
implements org.neo4j.kernel.impl.locking.StatementLocks

Slave specific statement locks that in addition to standard functionality provided by configured delegate will grab selected shared locks on master during prepareForCommit phase.

In order to prevent various indexes collisions on master during transaction commit that originate on one of the slaves we need to grab same locks on ResourceTypes.LABEL and ResourceTypes.RELATIONSHIP_TYPE that where obtained on origin. To be able to do that and also prevent shared locks to be propagates to master in cases of read only transactions we will postpone obtaining them till we know that we participating in a transaction that performs modifications. That's why we will obtain them only as part of prepareForCommit(LockTracer) call.

Method Summary

Modifier and Type	Method and Description
long	activeLockCount()
Stream<? extends org.neo4j.kernel.impl.locking.ActiveLock>	activeLocks()
void	close()
org.neo4j.kernel.impl.locking.Locks.Client	optimistic()
org.neo4j.kernel.impl.locking.Locks.Client	pessimistic()
void	prepareForCommit(org.neo4j.kernel.impl.locking.LockTracer lockTracer)
void	stop()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

pessimistic

public org.neo4j.kernel.impl.locking.Locks.Client pessimistic()

Specified by:

pessimistic in interface org.neo4j.kernel.impl.locking.StatementLocks

optimistic

public org.neo4j.kernel.impl.locking.Locks.Client optimistic()

Specified by:

optimistic in interface org.neo4j.kernel.impl.locking.StatementLocks

prepareForCommit

public void prepareForCommit(org.neo4j.kernel.impl.locking.LockTracer lockTracer)

Specified by:

prepareForCommit in interface org.neo4j.kernel.impl.locking.StatementLocks

stop

public void stop()

Specified by:

stop in interface org.neo4j.kernel.impl.locking.StatementLocks

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface org.neo4j.kernel.impl.locking.StatementLocks

activeLocks

public Stream<? extends org.neo4j.kernel.impl.locking.ActiveLock> activeLocks()

Specified by:

activeLocks in interface org.neo4j.kernel.impl.locking.StatementLocks

activeLockCount

public long activeLockCount()

Specified by:

activeLockCount in interface org.neo4j.kernel.impl.locking.StatementLocks