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/*
* Copyright 2002-2006 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.orm.hibernate;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import net.sf.hibernate.FlushMode;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.JDBCException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.engine.SessionImplementor;
import org.springframework.core.Ordered;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.jdbc.support.SQLExceptionTranslator;
import org.springframework.transaction.support.TransactionSynchronizationAdapter;
import org.springframework.transaction.support.TransactionSynchronizationManager;
/**
* Callback for resource cleanup at the end of a Spring-managed JTA transaction,
* that is, when participating in a JtaTransactionManager transaction.
*
* @author Juergen Hoeller
* @see SessionFactoryUtils
* @see org.springframework.transaction.jta.JtaTransactionManager
*/
class SpringSessionSynchronization extends TransactionSynchronizationAdapter implements Ordered {
private final SessionHolder sessionHolder;
private final SessionFactory sessionFactory;
private final SQLExceptionTranslator jdbcExceptionTranslator;
private final boolean newSession;
/**
* Whether Hibernate has a looked-up JTA TransactionManager that it will
* automatically register CacheSynchronizations with on Session connect.
*/
private boolean hibernateTransactionCompletion = false;
private Transaction jtaTransaction;
private boolean holderActive = true;
public SpringSessionSynchronization(
SessionHolder sessionHolder, SessionFactory sessionFactory,
SQLExceptionTranslator jdbcExceptionTranslator, boolean newSession) {
this.sessionHolder = sessionHolder;
this.sessionFactory = sessionFactory;
this.jdbcExceptionTranslator = jdbcExceptionTranslator;
this.newSession = newSession;
// Check whether the SessionFactory has a JTA TransactionManager.
TransactionManager jtaTm =
SessionFactoryUtils.getJtaTransactionManager(sessionFactory, sessionHolder.getAnySession());
if (jtaTm != null) {
this.hibernateTransactionCompletion = true;
// Fetch current JTA Transaction object
// (just necessary for JTA transaction suspension, with an individual
// Hibernate Session per currently active/suspended transaction).
try {
this.jtaTransaction = jtaTm.getTransaction();
}
catch (SystemException ex) {
throw new DataAccessResourceFailureException("Could not access JTA transaction", ex);
}
}
}
public int getOrder() {
return SessionFactoryUtils.SESSION_SYNCHRONIZATION_ORDER;
}
public void suspend() {
if (this.holderActive) {
TransactionSynchronizationManager.unbindResource(this.sessionFactory);
}
}
public void resume() {
if (this.holderActive) {
TransactionSynchronizationManager.bindResource(this.sessionFactory, this.sessionHolder);
}
}
public void beforeCommit(boolean readOnly) throws DataAccessException {
if (!readOnly) {
// read-write transaction -> flush the Hibernate Session
SessionFactoryUtils.logger.debug("Flushing Hibernate Session on transaction synchronization");
Session session = null;
// Check whether there is a Hibernate Session for the current JTA
// transaction. Else, fall back to the default thread-bound Session.
if (this.jtaTransaction != null) {
session = this.sessionHolder.getSession(this.jtaTransaction);
}
if (session == null) {
session = this.sessionHolder.getSession();
}
// Further check: only flush when not FlushMode.NEVER
if (!session.getFlushMode().equals(FlushMode.NEVER)) {
try {
session.flush();
}
catch (JDBCException ex) {
if (this.jdbcExceptionTranslator != null) {
throw this.jdbcExceptionTranslator.translate(
"Hibernate transaction synchronization: " + ex.getMessage(), null, ex.getSQLException());
}
else {
throw new HibernateJdbcException(ex);
}
}
catch (HibernateException ex) {
throw SessionFactoryUtils.convertHibernateAccessException(ex);
}
}
}
}
public void beforeCompletion() {
if (this.jtaTransaction != null) {
// Typically in case of a suspended JTA transaction:
// Remove the Session for the current JTA transaction, but keep the holder.
Session session = this.sessionHolder.removeSession(this.jtaTransaction);
if (session != null) {
if (this.sessionHolder.isEmpty()) {
// No Sessions for JTA transactions bound anymore -> could remove it.
if (TransactionSynchronizationManager.hasResource(this.sessionFactory)) {
// Explicit check necessary because of remote transaction propagation:
// The synchronization callbacks will execute in a different thread
// in such a scenario, as they're triggered by a remote server.
// The best we can do is to leave the SessionHolder bound to the
// thread that originally performed the data access. It will be
// reused when a new data access operation starts on that thread.
TransactionSynchronizationManager.unbindResource(this.sessionFactory);
}
this.holderActive = false;
}
// Do not close a pre-bound Session. In that case, we'll find the
// transaction-specific Session the same as the default Session.
if (session != this.sessionHolder.getSession()) {
SessionFactoryUtils.closeSessionOrRegisterDeferredClose(session, this.sessionFactory);
}
else if (this.sessionHolder.getPreviousFlushMode() != null) {
// In case of pre-bound Session, restore previous flush mode.
session.setFlushMode(this.sessionHolder.getPreviousFlushMode());
}
return;
}
}
// We'll only get here if there was no specific JTA transaction to handle.
if (this.newSession) {
// Default behavior: unbind and close the thread-bound Hibernate Session.
TransactionSynchronizationManager.unbindResource(this.sessionFactory);
this.holderActive = false;
if (this.hibernateTransactionCompletion) {
// Close the Hibernate Session here in case of a Hibernate TransactionManagerLookup:
// Hibernate will automatically defer the actual closing until JTA transaction completion.
// Else, the Session will be closed in the afterCompletion method, to provide the
// correct transaction status for releasing the Session's cache locks.
SessionFactoryUtils.closeSessionOrRegisterDeferredClose(this.sessionHolder.getSession(), this.sessionFactory);
}
}
else if (this.sessionHolder.getPreviousFlushMode() != null) {
// In case of pre-bound Session, restore previous flush mode.
this.sessionHolder.getSession().setFlushMode(this.sessionHolder.getPreviousFlushMode());
}
}
public void afterCompletion(int status) {
if (!this.hibernateTransactionCompletion || !this.newSession) {
// No Hibernate TransactionManagerLookup: apply afterTransactionCompletion callback.
// Always perform explicit afterTransactionCompletion callback for pre-bound Session,
// even with Hibernate TransactionManagerLookup (which only applies to new Sessions).
Session session = this.sessionHolder.getSession();
// Provide correct transaction status for releasing the Session's cache locks,
// if possible. Else, closing will release all cache locks assuming a rollback.
if (session instanceof SessionImplementor) {
((SessionImplementor) session).afterTransactionCompletion(status == STATUS_COMMITTED);
}
// Close the Hibernate Session here if necessary
// (closed in beforeCompletion in case of TransactionManagerLookup).
if (this.newSession) {
SessionFactoryUtils.closeSessionOrRegisterDeferredClose(session, this.sessionFactory);
}
}
if (!this.newSession && status != STATUS_COMMITTED) {
// Clear all pending inserts/updates/deletes in the Session.
// Necessary for pre-bound Sessions, to avoid inconsistent state.
this.sessionHolder.getSession().clear();
}
if (this.sessionHolder.doesNotHoldNonDefaultSession()) {
this.sessionHolder.setSynchronizedWithTransaction(false);
}
}
}
