/*
* Copyright 2002-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.transaction.support;
/**
* Interface for transaction synchronization callbacks.
* Supported by AbstractPlatformTransactionManager.
*
* <p>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.
*
* <p>System synchronizations performed by Spring itself use specific order values,
* allowing for fine-grained interaction with their execution order (if necessary).
*
* @author Juergen Hoeller
* @since 02.06.2003
* @see TransactionSynchronizationManager
* @see AbstractPlatformTransactionManager
* @see org.springframework.jdbc.datasource.DataSourceUtils#CONNECTION_SYNCHRONIZATION_ORDER
* @see org.springframework.orm.hibernate3.SessionFactoryUtils#SESSION_SYNCHRONIZATION_ORDER
*/
public interface TransactionSynchronization {
/** Completion status in case of proper commit */
int STATUS_COMMITTED = 0;
/** Completion status in case of proper rollback */
int STATUS_ROLLED_BACK = 1;
/** Completion status in case of heuristic mixed completion or system errors */
int STATUS_UNKNOWN = 2;
/**
* Suspend this synchronization.
* Supposed to unbind resources from TransactionSynchronizationManager if managing any.
* @see TransactionSynchronizationManager#unbindResource
*/
void suspend();
/**
* Resume this synchronization.
* Supposed to rebind resources to TransactionSynchronizationManager if managing any.
* @see TransactionSynchronizationManager#bindResource
*/
void resume();
/**
* Flush the underlying session to the datastore, if applicable:
* for example, a Hibernate/JPA session.
* @see org.springframework.transaction.TransactionStatus#flush()
*/
void flush();
/**
* Invoked before transaction commit (before "beforeCompletion").
* Can e.g. flush transactional O/R Mapping sessions to the database.
* <p>This callback does <i>not</i> 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.
* <p>Note that exceptions will get propagated to the commit caller and cause a
* rollback of the transaction.
* @param readOnly whether the transaction is defined as read-only transaction
* @throws RuntimeException in case of errors; will be <b>propagated to the caller</b>
* (note: do not throw TransactionException subclasses here!)
* @see #beforeCompletion
*/
void beforeCommit(boolean readOnly);
/**
* Invoked before transaction commit/rollback.
* Can perform resource cleanup <i>before</i> transaction completion.
* <p>This method will be invoked after <code>beforeCommit</code>, even when
* <code>beforeCommit</code> threw an exception. This callback allows for
* closing resources before transaction completion, for any outcome.
* @throws RuntimeException in case of errors; will be <b>logged but not propagated</b>
* (note: do not throw TransactionException subclasses here!)
* @see #beforeCommit
* @see #afterCompletion
*/
void beforeCompletion();
/**
* Invoked after transaction commit. Can perform further operations right
* <i>after</i> the main transaction has <i>successfully</i> committed.
* <p>Can e.g. commit further operations that are supposed to follow on a successful
* commit of the main transaction, like confirmation messages or emails.
* <p><b>NOTE:</b> 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: <b>Use <code>PROPAGATION_REQUIRES_NEW</code> for any
* transactional operation that is called from here.</b>
* @throws RuntimeException in case of errors; will be <b>propagated to the caller</b>
* (note: do not throw TransactionException subclasses here!)
*/
void afterCommit();
/**
* Invoked after transaction commit/rollback.
* Can perform resource cleanup <i>after</i> transaction completion.
* <p><b>NOTE:</b> 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: <b>Use <code>PROPAGATION_REQUIRES_NEW</code>
* for any transactional operation that is called from here.</b>
* @param status completion status according to the <code>STATUS_*</code> constants
* @throws RuntimeException in case of errors; will be <b>logged but not propagated</b>
* (note: do not throw TransactionException subclasses here!)
* @see #STATUS_COMMITTED
* @see #STATUS_ROLLED_BACK
* @see #STATUS_UNKNOWN
* @see #beforeCompletion
*/
void afterCompletion(int status);
}
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