io.micronaut.transaction

Interface ReactiveTransactionManager

All Superinterfaces:

TransactionManager

public interface ReactiveTransactionManager
extends TransactionManager

This is the central interface for reactive transaction infrastructure. Applications can use this directly, but it is not primarily meant as API: Typically, applications will work with either transactional operators or declarative transaction demarcation through AOP.

Since:

5.2

Author:

Mark Paluch, Juergen Hoeller, graemerocher

Method Summary

Modifier and Type	Method and Description
org.reactivestreams.Publisher<java.lang.Void>	commit(ReactiveTransaction transaction) Commit the given transaction, with regard to its status.
org.reactivestreams.Publisher<ReactiveTransaction>	getReactiveTransaction(TransactionDefinition definition) Emit a currently active reactive transaction or create a new one, according to the specified propagation behavior.
org.reactivestreams.Publisher<java.lang.Void>	rollback(ReactiveTransaction transaction) Perform a rollback of the given transaction.

Method Detail

getReactiveTransaction

org.reactivestreams.Publisher<ReactiveTransaction> getReactiveTransaction(@Nullable
                                                                          TransactionDefinition definition)
                                                                   throws TransactionException

Emit a currently active reactive transaction or create a new one, according to the specified propagation behavior.

Note that parameters like isolation level or timeout will only be applied to new transactions, and thus be ignored when participating in active ones.

Furthermore, not all transaction definition settings will be supported by every transaction manager: A proper transaction manager implementation should throw an exception when unsupported settings are encountered.

An exception to the above rule is the read-only flag, which should be ignored if no explicit read-only mode is supported. Essentially, the read-only flag is just a hint for potential optimization.

Parameters:

definition - the TransactionDefinition instance, describing propagation behavior, isolation level, timeout etc.

Returns:

transaction status object representing the new or current transaction

Throws:

TransactionException - in case of lookup, creation, or system errors

IllegalTransactionStateException - if the given transaction definition cannot be executed (for example, if a currently active transaction is in conflict with the specified propagation behavior)

See Also:

TransactionDefinition.getPropagationBehavior(), TransactionDefinition.getIsolationLevel(), TransactionDefinition.getTimeout(), TransactionDefinition.isReadOnly()

commit

org.reactivestreams.Publisher<java.lang.Void> commit(ReactiveTransaction transaction)
                                              throws TransactionException

Commit the given transaction, with regard to its status. If the transaction has been marked rollback-only programmatically, perform a rollback.

If the transaction wasn't a new one, omit the commit for proper participation in the surrounding transaction. If a previous transaction has been suspended to be able to create a new one, resume the previous transaction after committing the new one.

Note that when the commit call completes, no matter if normally or throwing an exception, the transaction must be fully completed and cleaned up. No rollback call should be expected in such a case.

If this method throws an exception other than a TransactionException, then some before-commit error caused the commit attempt to fail. For example, an O/R Mapping tool might have tried to flush changes to the database right before commit, with the resulting DataAccessException causing the transaction to fail. The original exception will be propagated to the caller of this commit method in such a case.

Parameters:

transaction - object returned by the getTransaction method

Returns:

A publisher that just completes

Throws:

UnexpectedRollbackException - in case of an unexpected rollback that the transaction coordinator initiated

HeuristicCompletionException - in case of a transaction failure caused by a heuristic decision on the side of the transaction coordinator

TransactionSystemException - in case of commit or system errors (typically caused by fundamental resource failures)

IllegalTransactionStateException - if the given transaction is already completed (that is, committed or rolled back)

TransactionException - if an exception occurs commiting the transaction

See Also:

TransactionExecution.setRollbackOnly()

rollback

org.reactivestreams.Publisher<java.lang.Void> rollback(ReactiveTransaction transaction)
                                                throws TransactionException

Perform a rollback of the given transaction.

If the transaction wasn't a new one, just set it rollback-only for proper participation in the surrounding transaction. If a previous transaction has been suspended to be able to create a new one, resume the previous transaction after rolling back the new one.

Do not call rollback on a transaction if commit threw an exception. The transaction will already have been completed and cleaned up when commit returns, even in case of a commit exception. Consequently, a rollback call after commit failure will lead to an IllegalTransactionStateException.

Parameters:

transaction - object returned by the getTransaction method

Returns:

A publisher that just completes

Throws:

TransactionSystemException - in case of rollback or system errors (typically caused by fundamental resource failures)

IllegalTransactionStateException - if the given transaction is already completed (that is, committed or rolled back)

TransactionException - if an exception occurs commiting the transaction