org.neo4j.kernel.ha.transaction

Class TransactionPropagator

java.lang.Object

org.neo4j.kernel.ha.transaction.TransactionPropagator

All Implemented Interfaces:

org.neo4j.kernel.lifecycle.Lifecycle

public class TransactionPropagator
extends Object
implements org.neo4j.kernel.lifecycle.Lifecycle

Pushes transactions committed on master to one or more slaves. Number of slaves receiving each transactions is controlled by HaSettings.tx_push_factor. Which slaves receives transactions is controlled by HaSettings.tx_push_strategy. An attempt is made to push each transaction to the wanted number of slaves, but if it isn't possible and a timeout is hit, propagation will still be considered as successful and occurrence will be logged.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	TransactionPropagator.Configuration

Nested classes/interfaces inherited from interface org.neo4j.kernel.lifecycle.Lifecycle

org.neo4j.kernel.lifecycle.Lifecycle.Delegate

Constructor Summary

Constructors

Constructor and Description
TransactionPropagator(TransactionPropagator.Configuration config, org.neo4j.logging.Log log, Slaves slaves, CommitPusher pusher)

Method Summary

Modifier and Type	Method and Description
int	committed(long txId, int authorId)
static TransactionPropagator.Configuration	from(org.neo4j.kernel.configuration.Config config)
static TransactionPropagator.Configuration	from(org.neo4j.kernel.configuration.Config config, SlavePriority slavePriority)
void	init()
void	shutdown()
void	start()
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionPropagator

public TransactionPropagator(TransactionPropagator.Configuration config,
                             org.neo4j.logging.Log log,
                             Slaves slaves,
                             CommitPusher pusher)

Method Detail

from

public static TransactionPropagator.Configuration from(org.neo4j.kernel.configuration.Config config)

from

public static TransactionPropagator.Configuration from(org.neo4j.kernel.configuration.Config config,
                                                       SlavePriority slavePriority)

init

public void init()

Specified by:

init in interface org.neo4j.kernel.lifecycle.Lifecycle

start

public void start()

Specified by:

start in interface org.neo4j.kernel.lifecycle.Lifecycle

stop

public void stop()

Specified by:

stop in interface org.neo4j.kernel.lifecycle.Lifecycle

shutdown

public void shutdown()

Specified by:

shutdown in interface org.neo4j.kernel.lifecycle.Lifecycle

committed

public int committed(long txId,
                     int authorId)

Parameters:

txId - transaction id to replicate

authorId - author id for such transaction id

Returns:

the number of missed replicas (e.g., desired replication factor - number of successful replications)