org.springframework.kafka.transaction

Class KafkaTransactionManager<K,V>

java.lang.Object

org.springframework.transaction.support.AbstractPlatformTransactionManager

org.springframework.kafka.transaction.KafkaTransactionManager<K,V>

Type Parameters:

K - the key type.

V - the value type.

All Implemented Interfaces:

java.io.Serializable, KafkaAwareTransactionManager<K,V>, org.springframework.transaction.PlatformTransactionManager, org.springframework.transaction.support.ResourceTransactionManager

public class KafkaTransactionManager<K,V>
extends org.springframework.transaction.support.AbstractPlatformTransactionManager
implements KafkaAwareTransactionManager<K,V>

PlatformTransactionManager implementation for a single Kafka ProducerFactory. Binds a Kafka producer from the specified ProducerFactory to the thread, potentially allowing for one thread-bound producer per ProducerFactory.

This local strategy is an alternative to executing Kafka operations within, and synchronized with, external transactions. This strategy is not able to provide XA transactions, for example in order to share transactions between messaging and database access.

Application code is required to retrieve the transactional Kafka resources via ProducerFactoryUtils.getTransactionalResourceHolder(ProducerFactory). Spring's KafkaTemplate will auto detect a thread-bound Producer and automatically participate in it.

The use of DefaultKafkaProducerFactory as a target for this transaction manager is strongly recommended. Because it caches producers for reuse.

Transaction synchronization is turned off by default, as this manager might be used alongside a datastore-based Spring transaction manager such as the JDBC org.springframework.jdbc.datasource.DataSourceTransactionManager, which has stronger needs for synchronization.

Author:

Gary Russell

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager

org.springframework.transaction.support.AbstractPlatformTransactionManager.SuspendedResourcesHolder

Field Summary

Fields inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager

logger, SYNCHRONIZATION_ALWAYS, SYNCHRONIZATION_NEVER, SYNCHRONIZATION_ON_ACTUAL_TRANSACTION

Constructor Summary

Constructors

Constructor and Description
KafkaTransactionManager(ProducerFactory<K,V> producerFactory) Create a new KafkaTransactionManager, given a ProducerFactory.

Method Summary

Modifier and Type	Method and Description
protected void	doBegin(java.lang.Object transaction, org.springframework.transaction.TransactionDefinition definition)
protected void	doCleanupAfterCompletion(java.lang.Object transaction)
protected void	doCommit(org.springframework.transaction.support.DefaultTransactionStatus status)
protected java.lang.Object	doGetTransaction()
protected void	doResume(java.lang.Object transaction, java.lang.Object suspendedResources)
protected void	doRollback(org.springframework.transaction.support.DefaultTransactionStatus status)
protected void	doSetRollbackOnly(org.springframework.transaction.support.DefaultTransactionStatus status)
protected java.lang.Object	doSuspend(java.lang.Object transaction)
ProducerFactory<K,V>	getProducerFactory() Get the producer factory.
java.lang.Object	getResourceFactory() Deprecated. - in a future release KafkaAwareTransactionManager will not be a sub interface of ResourceTransactionManager. TODO: Remove in 3.0
protected boolean	isExistingTransaction(java.lang.Object transaction)

Methods inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager

commit, determineTimeout, getDefaultTimeout, getTransaction, getTransactionSynchronization, invokeAfterCompletion, isFailEarlyOnGlobalRollbackOnly, isGlobalRollbackOnParticipationFailure, isNestedTransactionAllowed, isRollbackOnCommitFailure, isValidateExistingTransaction, newTransactionStatus, prepareForCommit, prepareSynchronization, prepareTransactionStatus, registerAfterCompletionWithExistingTransaction, resume, rollback, setDefaultTimeout, setFailEarlyOnGlobalRollbackOnly, setGlobalRollbackOnParticipationFailure, setNestedTransactionAllowed, setRollbackOnCommitFailure, setTransactionSynchronization, setTransactionSynchronizationName, setValidateExistingTransaction, shouldCommitOnGlobalRollbackOnly, suspend, triggerBeforeCommit, triggerBeforeCompletion, useSavepointForNestedTransaction

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.transaction.PlatformTransactionManager

commit, getTransaction, rollback

Constructor Detail

KafkaTransactionManager

public KafkaTransactionManager(ProducerFactory<K,V> producerFactory)

Create a new KafkaTransactionManager, given a ProducerFactory. Transaction synchronization is turned off by default, as this manager might be used alongside a datastore-based Spring transaction manager like DataSourceTransactionManager, which has stronger needs for synchronization. Only one manager is allowed to drive synchronization at any point of time.

Parameters:

producerFactory - the ProducerFactory to use

Method Detail

getProducerFactory

public ProducerFactory<K,V> getProducerFactory()

Get the producer factory.

Specified by:

getProducerFactory in interface KafkaAwareTransactionManager<K,V>

Returns:

the producerFactory

getResourceFactory

@Deprecated
public java.lang.Object getResourceFactory()

Deprecated. - in a future release KafkaAwareTransactionManager will not be a sub interface of ResourceTransactionManager. TODO: Remove in 3.0

Return the producer factory.

Specified by:

getResourceFactory in interface org.springframework.transaction.support.ResourceTransactionManager

Returns:

the producer factory.

doGetTransaction

protected java.lang.Object doGetTransaction()

Specified by:

doGetTransaction in class org.springframework.transaction.support.AbstractPlatformTransactionManager

isExistingTransaction

protected boolean isExistingTransaction(java.lang.Object transaction)

Overrides:

isExistingTransaction in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doBegin

protected void doBegin(java.lang.Object transaction,
                       org.springframework.transaction.TransactionDefinition definition)

Specified by:

doBegin in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doSuspend

protected java.lang.Object doSuspend(java.lang.Object transaction)

Overrides:

doSuspend in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doResume

protected void doResume(java.lang.Object transaction,
                        java.lang.Object suspendedResources)

Overrides:

doResume in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doCommit

protected void doCommit(org.springframework.transaction.support.DefaultTransactionStatus status)

Specified by:

doCommit in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doRollback

protected void doRollback(org.springframework.transaction.support.DefaultTransactionStatus status)

Specified by:

doRollback in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doSetRollbackOnly

protected void doSetRollbackOnly(org.springframework.transaction.support.DefaultTransactionStatus status)

Overrides:

doSetRollbackOnly in class org.springframework.transaction.support.AbstractPlatformTransactionManager

doCleanupAfterCompletion

protected void doCleanupAfterCompletion(java.lang.Object transaction)

Overrides:

doCleanupAfterCompletion in class org.springframework.transaction.support.AbstractPlatformTransactionManager