org.springframework.r2dbc.connection

Class R2dbcTransactionManager

java.lang.Object

org.springframework.transaction.reactive.AbstractReactiveTransactionManager

org.springframework.r2dbc.connection.R2dbcTransactionManager

All Implemented Interfaces:

Serializable, InitializingBean, ReactiveTransactionManager, TransactionManager

public class R2dbcTransactionManager
extends AbstractReactiveTransactionManager
implements InitializingBean

ReactiveTransactionManager implementation for a single R2DBC ConnectionFactory. This class is capable of working in any environment with any R2DBC driver, as long as the setup uses a ConnectionFactory as its Connection factory mechanism. Binds a R2DBC Connection from the specified ConnectionFactory to the current subscriber context, potentially allowing for one context-bound Connection per ConnectionFactory.

Note: The ConnectionFactory that this transaction manager operates on needs to return independent Connections. The Connections may come from a pool (the typical case), but the ConnectionFactory must not return scoped scoped Connections or the like. This transaction manager will associate Connection with context-bound transactions itself, according to the specified propagation behavior. It assumes that a separate, independent Connection can be obtained even during an ongoing transaction.

Application code is required to retrieve the R2DBC Connection via ConnectionFactoryUtils.getConnection(ConnectionFactory) instead of a standard R2DBC-style ConnectionFactory.create() call. Spring classes such as DatabaseClient use this strategy implicitly. If not used in combination with this transaction manager, the ConnectionFactoryUtils lookup strategy behaves exactly like the native ConnectionFactory lookup; it can thus be used in a portable fashion.

Alternatively, you can allow application code to work with the standard R2DBC lookup pattern ConnectionFactory.create(), for example for code that is not aware of Spring at all. In that case, define a TransactionAwareConnectionFactoryProxy for your target ConnectionFactory, and pass that proxy ConnectionFactory to your DAOs, which will automatically participate in Spring-managed transactions when accessing it.

This transaction manager triggers flush callbacks on registered transaction synchronizations (if synchronization is generally active), assuming resources operating on the underlying R2DBC Connection.

Since:

5.3

Author:

Mark Paluch

See Also:

ConnectionFactoryUtils.getConnection(ConnectionFactory), ConnectionFactoryUtils.releaseConnection(io.r2dbc.spi.Connection, io.r2dbc.spi.ConnectionFactory), TransactionAwareConnectionFactoryProxy, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.transaction.reactive.AbstractReactiveTransactionManager

AbstractReactiveTransactionManager.SuspendedResourcesHolder

Field Summary

Fields inherited from class org.springframework.transaction.reactive.AbstractReactiveTransactionManager

logger

Constructor Summary

Constructors

Constructor and Description
R2dbcTransactionManager() Create a new R2dbcTransactionManager instance.
R2dbcTransactionManager(ConnectionFactory connectionFactory) Create a new R2dbcTransactionManager instance.

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Invoked by the containing BeanFactory after it has set all bean properties and satisfied BeanFactoryAware, ApplicationContextAware etc.
protected Duration	determineTimeout(TransactionDefinition definition) Determine the actual timeout to use for the given definition.
protected reactor.core.publisher.Mono<Void>	doBegin(TransactionSynchronizationManager synchronizationManager, Object transaction, TransactionDefinition definition) Begin a new transaction with semantics according to the given transaction definition.
protected reactor.core.publisher.Mono<Void>	doCleanupAfterCompletion(TransactionSynchronizationManager synchronizationManager, Object transaction) Cleanup resources after transaction completion.
protected reactor.core.publisher.Mono<Void>	doCommit(TransactionSynchronizationManager TransactionSynchronizationManager, GenericReactiveTransaction status) Perform an actual commit of the given transaction.
protected Object	doGetTransaction(TransactionSynchronizationManager synchronizationManager) Return a transaction object for the current transaction state.
protected reactor.core.publisher.Mono<Void>	doResume(TransactionSynchronizationManager synchronizationManager, Object transaction, Object suspendedResources) Resume the resources of the current transaction.
protected reactor.core.publisher.Mono<Void>	doRollback(TransactionSynchronizationManager TransactionSynchronizationManager, GenericReactiveTransaction status) Perform an actual rollback of the given transaction.
protected reactor.core.publisher.Mono<Void>	doSetRollbackOnly(TransactionSynchronizationManager synchronizationManager, GenericReactiveTransaction status) Set the given transaction rollback-only.
protected reactor.core.publisher.Mono<Object>	doSuspend(TransactionSynchronizationManager synchronizationManager, Object transaction) Suspend the resources of the current transaction.
ConnectionFactory	getConnectionFactory() Return the R2DBC ConnectionFactory that this instance manages transactions for.
boolean	isEnforceReadOnly() Return whether to enforce the read-only nature of a transaction through an explicit statement on the transactional connection.
protected boolean	isExistingTransaction(Object transaction) Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).
protected ConnectionFactory	obtainConnectionFactory() Obtain the ConnectionFactory for actual use.
protected reactor.core.publisher.Mono<Void>	prepareTransactionalConnection(Connection con, TransactionDefinition definition, Object transaction) Prepare the transactional Connection right after transaction begin.
protected IsolationLevel	resolveIsolationLevel(int isolationLevel) Resolve the isolation level constant to a R2DBC IsolationLevel.
void	setConnectionFactory(ConnectionFactory connectionFactory) Set the R2DBC ConnectionFactory that this instance should manage transactions for.
void	setEnforceReadOnly(boolean enforceReadOnly) Specify whether to enforce the read-only nature of a transaction (as indicated by TransactionDefinition.isReadOnly() through an explicit statement on the transactional connection: "SET TRANSACTION READ ONLY" as understood by Oracle, MySQL and Postgres.
protected RuntimeException	translateException(String task, R2dbcException ex) Translate the given R2DBC commit/rollback exception to a common Spring exception to propagate from the AbstractReactiveTransactionManager.commit(org.springframework.transaction.ReactiveTransaction)/AbstractReactiveTransactionManager.rollback(org.springframework.transaction.ReactiveTransaction) call.

Methods inherited from class org.springframework.transaction.reactive.AbstractReactiveTransactionManager

commit, getReactiveTransaction, prepareForCommit, registerAfterCompletionWithExistingTransaction, rollback

Methods inherited from class java.lang.Object

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

Constructor Detail

R2dbcTransactionManager

public R2dbcTransactionManager()

Create a new R2dbcTransactionManager instance. A ConnectionFactory has to be set to be able to use it.

See Also:

setConnectionFactory(io.r2dbc.spi.ConnectionFactory)

R2dbcTransactionManager

public R2dbcTransactionManager(ConnectionFactory connectionFactory)

Create a new R2dbcTransactionManager instance.

Parameters:

connectionFactory - the R2DBC ConnectionFactory to manage transactions for

Method Detail

setConnectionFactory

public void setConnectionFactory(@Nullable
                                 ConnectionFactory connectionFactory)

Set the R2DBC ConnectionFactory that this instance should manage transactions for.

This will typically be a locally defined ConnectionFactory, for example an connection pool.

The ConnectionFactory passed in here needs to return independent Connections. The Connections may come from a pool (the typical case), but the ConnectionFactory must not return scoped Connections or the like.

See Also:

TransactionAwareConnectionFactoryProxy

getConnectionFactory

@Nullable
public ConnectionFactory getConnectionFactory()

Return the R2DBC ConnectionFactory that this instance manages transactions for.

obtainConnectionFactory

protected ConnectionFactory obtainConnectionFactory()

Obtain the ConnectionFactory for actual use.

Returns:

the ConnectionFactory (never null)

Throws:

IllegalStateException - in case of no ConnectionFactory set

setEnforceReadOnly

public void setEnforceReadOnly(boolean enforceReadOnly)

Specify whether to enforce the read-only nature of a transaction (as indicated by TransactionDefinition.isReadOnly() through an explicit statement on the transactional connection: "SET TRANSACTION READ ONLY" as understood by Oracle, MySQL and Postgres.

The exact treatment, including any SQL statement executed on the connection, can be customized through through prepareTransactionalConnection(io.r2dbc.spi.Connection, org.springframework.transaction.TransactionDefinition, java.lang.Object).

See Also:

prepareTransactionalConnection(io.r2dbc.spi.Connection, org.springframework.transaction.TransactionDefinition, java.lang.Object)

isEnforceReadOnly

public boolean isEnforceReadOnly()

Return whether to enforce the read-only nature of a transaction through an explicit statement on the transactional connection.

See Also:

setEnforceReadOnly(boolean)

afterPropertiesSet

public void afterPropertiesSet()

Description copied from interface: InitializingBean

Invoked by the containing BeanFactory after it has set all bean properties and satisfied BeanFactoryAware, ApplicationContextAware etc.

This method allows the bean instance to perform validation of its overall configuration and final initialization when all bean properties have been set.

Specified by:

afterPropertiesSet in interface InitializingBean

doGetTransaction

protected Object doGetTransaction(TransactionSynchronizationManager synchronizationManager)
                           throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Return a transaction object for the current transaction state.

The returned object will usually be specific to the concrete transaction manager implementation, carrying corresponding transaction state in a modifiable fashion. This object will be passed into the other template methods (e.g. doBegin and doCommit), either directly or as part of a DefaultReactiveTransactionStatus instance.

The returned object should contain information about any existing transaction, that is, a transaction that has already started before the current getTransaction call on the transaction manager. Consequently, a doGetTransaction implementation will usually look for an existing transaction and store corresponding state in the returned transaction object.

Specified by:

doGetTransaction in class AbstractReactiveTransactionManager

Parameters:

synchronizationManager - the synchronization manager bound to the current transaction

Returns:

the current transaction object

Throws:

CannotCreateTransactionException - if transaction support is not available

TransactionException - in case of lookup or system errors

See Also:

AbstractReactiveTransactionManager.doBegin(org.springframework.transaction.reactive.TransactionSynchronizationManager, java.lang.Object, org.springframework.transaction.TransactionDefinition), AbstractReactiveTransactionManager.doCommit(org.springframework.transaction.reactive.TransactionSynchronizationManager, org.springframework.transaction.reactive.GenericReactiveTransaction), AbstractReactiveTransactionManager.doRollback(org.springframework.transaction.reactive.TransactionSynchronizationManager, org.springframework.transaction.reactive.GenericReactiveTransaction), GenericReactiveTransaction.getTransaction()

isExistingTransaction

protected boolean isExistingTransaction(Object transaction)

Description copied from class: AbstractReactiveTransactionManager

Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).

The result will be evaluated according to the specified propagation behavior for the new transaction. An existing transaction might get suspended (in case of PROPAGATION_REQUIRES_NEW), or the new transaction might participate in the existing one (in case of PROPAGATION_REQUIRED).

The default implementation returns false, assuming that participating in existing transactions is generally not supported. Subclasses are of course encouraged to provide such support.

Overrides:

isExistingTransaction in class AbstractReactiveTransactionManager

Parameters:

transaction - the transaction object returned by doGetTransaction

Returns:

if there is an existing transaction

See Also:

AbstractReactiveTransactionManager.doGetTransaction(org.springframework.transaction.reactive.TransactionSynchronizationManager)

doBegin

protected reactor.core.publisher.Mono<Void> doBegin(TransactionSynchronizationManager synchronizationManager,
                                                    Object transaction,
                                                    TransactionDefinition definition)
                                             throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Begin a new transaction with semantics according to the given transaction definition. Does not have to care about applying the propagation behavior, as this has already been handled by this abstract manager.

This method gets called when the transaction manager has decided to actually start a new transaction. Either there wasn't any transaction before, or the previous transaction has been suspended.

A special scenario is a nested transaction: This method will be called to start a nested transaction when necessary. In such a context, there will be an active transaction: The implementation of this method has to detect this and start an appropriate nested transaction.

Specified by:

doBegin in class AbstractReactiveTransactionManager

Parameters:

synchronizationManager - the synchronization manager bound to the new transaction

transaction - the transaction object returned by doGetTransaction

definition - a TransactionDefinition instance, describing propagation behavior, isolation level, read-only flag, timeout, and transaction name

Throws:

TransactionException - in case of creation or system errors

NestedTransactionNotSupportedException - if the underlying transaction does not support nesting (e.g. through savepoints)

determineTimeout

protected Duration determineTimeout(TransactionDefinition definition)

Determine the actual timeout to use for the given definition. Will fall back to this manager's default timeout if the transaction definition doesn't specify a non-default value.

Parameters:

definition - the transaction definition

Returns:

the actual timeout to use

See Also:

TransactionDefinition.getTimeout()

doSuspend

protected reactor.core.publisher.Mono<Object> doSuspend(TransactionSynchronizationManager synchronizationManager,
                                                        Object transaction)
                                                 throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Suspend the resources of the current transaction. Transaction synchronization will already have been suspended.

The default implementation throws a TransactionSuspensionNotSupportedException, assuming that transaction suspension is generally not supported.

Overrides:

doSuspend in class AbstractReactiveTransactionManager

Parameters:

synchronizationManager - the synchronization manager bound to the current transaction

transaction - the transaction object returned by doGetTransaction

Returns:

an object that holds suspended resources (will be kept unexamined for passing it into doResume)

Throws:

TransactionSuspensionNotSupportedException - if suspending is not supported by the transaction manager implementation

TransactionException - in case of system errors

See Also:

AbstractReactiveTransactionManager.doResume(org.springframework.transaction.reactive.TransactionSynchronizationManager, java.lang.Object, java.lang.Object)

doResume

protected reactor.core.publisher.Mono<Void> doResume(TransactionSynchronizationManager synchronizationManager,
                                                     @Nullable
                                                     Object transaction,
                                                     Object suspendedResources)
                                              throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Resume the resources of the current transaction. Transaction synchronization will be resumed afterwards.

The default implementation throws a TransactionSuspensionNotSupportedException, assuming that transaction suspension is generally not supported.

Overrides:

doResume in class AbstractReactiveTransactionManager

Parameters:

synchronizationManager - the synchronization manager bound to the current transaction

transaction - the transaction object returned by doGetTransaction

suspendedResources - the object that holds suspended resources, as returned by doSuspend

Throws:

TransactionSuspensionNotSupportedException - if suspending is not supported by the transaction manager implementation

TransactionException - in case of system errors

See Also:

AbstractReactiveTransactionManager.doSuspend(org.springframework.transaction.reactive.TransactionSynchronizationManager, java.lang.Object)

doCommit

protected reactor.core.publisher.Mono<Void> doCommit(TransactionSynchronizationManager TransactionSynchronizationManager,
                                                     GenericReactiveTransaction status)
                                              throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Perform an actual commit of the given transaction.

An implementation does not need to check the "new transaction" flag or the rollback-only flag; this will already have been handled before. Usually, a straight commit will be performed on the transaction object contained in the passed-in status.

Specified by:

doCommit in class AbstractReactiveTransactionManager

Parameters:

TransactionSynchronizationManager - the synchronization manager bound to the current transaction

status - the status representation of the transaction

Throws:

TransactionException - in case of commit or system errors

See Also:

GenericReactiveTransaction.getTransaction()

doRollback

protected reactor.core.publisher.Mono<Void> doRollback(TransactionSynchronizationManager TransactionSynchronizationManager,
                                                       GenericReactiveTransaction status)
                                                throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Perform an actual rollback of the given transaction.

An implementation does not need to check the "new transaction" flag; this will already have been handled before. Usually, a straight rollback will be performed on the transaction object contained in the passed-in status.

Specified by:

doRollback in class AbstractReactiveTransactionManager

Parameters:

TransactionSynchronizationManager - the synchronization manager bound to the current transaction

status - the status representation of the transaction

Throws:

TransactionException - in case of system errors

See Also:

GenericReactiveTransaction.getTransaction()

doSetRollbackOnly

protected reactor.core.publisher.Mono<Void> doSetRollbackOnly(TransactionSynchronizationManager synchronizationManager,
                                                              GenericReactiveTransaction status)
                                                       throws TransactionException

Description copied from class: AbstractReactiveTransactionManager

Set the given transaction rollback-only. Only called on rollback if the current transaction participates in an existing one.

The default implementation throws an IllegalTransactionStateException, assuming that participating in existing transactions is generally not supported. Subclasses are of course encouraged to provide such support.

Overrides:

doSetRollbackOnly in class AbstractReactiveTransactionManager

Parameters:

synchronizationManager - the synchronization manager bound to the current transaction

status - the status representation of the transaction

Throws:

TransactionException - in case of system errors

doCleanupAfterCompletion

protected reactor.core.publisher.Mono<Void> doCleanupAfterCompletion(TransactionSynchronizationManager synchronizationManager,
                                                                     Object transaction)

Description copied from class: AbstractReactiveTransactionManager

Cleanup resources after transaction completion.

Called after doCommit and doRollback execution, on any outcome. The default implementation does nothing.

Should not throw any exceptions but just issue warnings on errors.

Overrides:

doCleanupAfterCompletion in class AbstractReactiveTransactionManager

Parameters:

synchronizationManager - the synchronization manager bound to the current transaction

transaction - the transaction object returned by doGetTransaction

prepareTransactionalConnection

protected reactor.core.publisher.Mono<Void> prepareTransactionalConnection(Connection con,
                                                                           TransactionDefinition definition,
                                                                           Object transaction)

Prepare the transactional Connection right after transaction begin.

The default implementation executes a "SET TRANSACTION READ ONLY" statement if the "enforceReadOnly" flag is set to true and the transaction definition indicates a read-only transaction.

The "SET TRANSACTION READ ONLY" is understood by Oracle, MySQL and Postgres and may work with other databases as well. If you'd like to adapt this treatment, override this method accordingly.

Parameters:

con - the transactional R2DBC Connection

definition - the current transaction definition

transaction - the transaction object

See Also:

setEnforceReadOnly(boolean)

resolveIsolationLevel

@Nullable
protected IsolationLevel resolveIsolationLevel(int isolationLevel)

Resolve the isolation level constant to a R2DBC IsolationLevel. If you'd like to extend isolation level translation for vendor-specific IsolationLevels, override this method accordingly.

Parameters:

isolationLevel - the isolation level to translate.

Returns:

the resolved isolation level. Can be null if not resolvable or the isolation level should remain default.

See Also:

TransactionDefinition.getIsolationLevel()

translateException

protected RuntimeException translateException(String task,
                                              R2dbcException ex)

Translate the given R2DBC commit/rollback exception to a common Spring exception to propagate from the AbstractReactiveTransactionManager.commit(org.springframework.transaction.ReactiveTransaction)/AbstractReactiveTransactionManager.rollback(org.springframework.transaction.ReactiveTransaction) call.

Parameters:

task - the task description (commit or rollback).

ex - the SQLException thrown from commit/rollback.

Returns:

the translated exception to emit