io.micronaut.transaction.support

Interface TransactionSynchronization

All Superinterfaces:

java.io.Flushable

All Known Implementing Classes:

FlushSynchronization, SessionSynchronization, TransactionSynchronizationAdapter

public interface TransactionSynchronization
extends java.io.Flushable

Interface for transaction synchronization callbacks. Supported by AbstractPlatformTransactionManager.

TransactionSynchronization implementations can implement the Ordered interface to influence their execution order. A synchronization that does not implement the Ordered interface is appended to the end of the synchronization chain.

System synchronizations performed by Spring itself use specific order values, allowing for fine-grained interaction with their execution order (if necessary).

Since:

02.06.2003

Author:

Juergen Hoeller

See Also:

TransactionSynchronizationManager, AbstractSynchronousTransactionManager, DataSourceUtils.CONNECTION_SYNCHRONIZATION_ORDER

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	TransactionSynchronization.Status Transaction synchronization status.

Method Summary

Modifier and Type	Method and Description
default void	afterCommit() Invoked after transaction commit.
default void	afterCompletion(TransactionSynchronization.Status status) Invoked after transaction commit/rollback.
default void	beforeCommit(boolean readOnly) Invoked before transaction commit (before "beforeCompletion").
default void	beforeCompletion() Invoked before transaction commit/rollback.
default void	flush() Flush the underlying session to the datastore, if applicable: for example, a Hibernate/JPA session.
default void	resume() Resume this synchronization.
default void	suspend() Suspend this synchronization.

Method Detail

suspend

default void suspend()

Suspend this synchronization. Supposed to unbind resources from TransactionSynchronizationManager if managing any.

See Also:

TransactionSynchronizationManager.unbindResource(java.lang.Object)

resume

default void resume()

Resume this synchronization. Supposed to rebind resources to TransactionSynchronizationManager if managing any.

See Also:

TransactionSynchronizationManager.bindResource(java.lang.Object, java.lang.Object)

flush

default void flush()

Flush the underlying session to the datastore, if applicable: for example, a Hibernate/JPA session.

Specified by:

flush in interface java.io.Flushable

See Also:

TransactionStatus.flush()

beforeCommit

default void beforeCommit(boolean readOnly)

Invoked before transaction commit (before "beforeCompletion"). Can e.g. flush transactional O/R Mapping sessions to the database.

This callback does not mean that the transaction will actually be committed. A rollback decision can still occur after this method has been called. This callback is rather meant to perform work that's only relevant if a commit still has a chance to happen, such as flushing SQL statements to the database.

Note that exceptions will get propagated to the commit caller and cause a rollback of the transaction.

Parameters:

readOnly - whether the transaction is defined as read-only transaction

Throws:

java.lang.RuntimeException - in case of errors; will be propagated to the caller (note: do not throw TransactionException subclasses here!)

See Also:

beforeCompletion()

beforeCompletion

default void beforeCompletion()

Invoked before transaction commit/rollback. Can perform resource cleanup before transaction completion.

This method will be invoked after beforeCommit, even when beforeCommit threw an exception. This callback allows for closing resources before transaction completion, for any outcome.

Throws:

java.lang.RuntimeException - in case of errors; will be logged but not propagated (note: do not throw TransactionException subclasses here!)

See Also:

beforeCommit(boolean), afterCompletion(io.micronaut.transaction.support.TransactionSynchronization.Status)

afterCommit

default void afterCommit()

Invoked after transaction commit. Can perform further operations right after the main transaction has successfully committed.

Can e.g. commit further operations that are supposed to follow on a successful commit of the main transaction, like confirmation messages or emails.

NOTE: The transaction will have been committed already, but the transactional resources might still be active and accessible. As a consequence, any data access code triggered at this point will still "participate" in the original transaction, allowing to perform some cleanup (with no commit following anymore!), unless it explicitly declares that it needs to run in a separate transaction. Hence: Use PROPAGATION_REQUIRES_NEW for any transactional operation that is called from here.

Throws:

java.lang.RuntimeException - in case of errors; will be propagated to the caller (note: do not throw TransactionException subclasses here!)

afterCompletion

default void afterCompletion(@NonNull
                             TransactionSynchronization.Status status)

Invoked after transaction commit/rollback. Can perform resource cleanup after transaction completion.

NOTE: The transaction will have been committed or rolled back already, but the transactional resources might still be active and accessible. As a consequence, any data access code triggered at this point will still "participate" in the original transaction, allowing to perform some cleanup (with no commit following anymore!), unless it explicitly declares that it needs to run in a separate transaction. Hence: Use PROPAGATION_REQUIRES_NEW for any transactional operation that is called from here.

Parameters:

status - completion status according to the STATUS_* constants

Throws:

java.lang.RuntimeException - in case of errors; will be logged but not propagated (note: do not throw TransactionException subclasses here!)

See Also:

TransactionSynchronization.Status.COMMITTED, TransactionSynchronization.Status.ROLLED_BACK, TransactionSynchronization.Status.UNKNOWN, beforeCompletion()