Example usage for org.springframework.transaction.support TransactionSynchronizationManager registerSynchronization

List of usage examples for org.springframework.transaction.support TransactionSynchronizationManager registerSynchronization

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Introduction

In this page you can find the example usage for org.springframework.transaction.support TransactionSynchronizationManager registerSynchronization.

Prototype

public static void registerSynchronization(TransactionSynchronization synchronization)
        throws IllegalStateException

Source Link

Document

Register a new transaction synchronization for the current thread.

Usage

From source file:org.springframework.datastore.mapping.core.DatastoreUtils.java

/**
 * Get a Datastore Session for the given Datastore. Is aware of and will
 * return any existing corresponding Session bound to the current thread, for
 * example when using {@link org.springframework.datastore.mapping.transactions.DatastoreTransactionManager}. Will create a new
 * Session otherwise, if "allowCreate" is <code>true</code>.
 *
 * @param datastore Datastore to create the session with
 * Session on transaction synchronization (may be <code>null</code>)
 * @param allowCreate whether a non-transactional Session should be created
 * when no transactional Session can be found for the current thread
 * @return the Datastore Session/* ww w . j  a va  2s  . c o  m*/
 * @throws IllegalStateException if no thread-bound Session found and
 * "allowCreate" is <code>false</code>
 */
private static Session doGetSession(Datastore datastore, boolean allowCreate) {

    Assert.notNull(datastore, "No Datastore specified");

    SessionHolder sessionHolder = (SessionHolder) TransactionSynchronizationManager.getResource(datastore);

    if (sessionHolder != null && !sessionHolder.isEmpty()) {
        // pre-bound Datastore Session
        Session session;
        if (TransactionSynchronizationManager.isSynchronizationActive()
                && sessionHolder.doesNotHoldNonDefaultSession()) {
            // Spring transaction management is active ->
            // register pre-bound Session with it for transactional flushing.
            session = sessionHolder.getSession();
            if (session != null && !sessionHolder.isSynchronizedWithTransaction()) {
                logger.debug("Registering Spring transaction synchronization for existing Datastore Session");
                TransactionSynchronizationManager.registerSynchronization(
                        new SpringSessionSynchronization(sessionHolder, datastore, false));
                sessionHolder.setSynchronizedWithTransaction(true);

            }
            if (session != null) {
                return session;
            }
        }
    }

    logger.debug("Opening Datastore Session");
    Session session = datastore.connect();

    // Use same Session for further Datastore actions within the transaction.
    // Thread object will get removed by synchronization at transaction completion.
    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        // We're within a Spring-managed transaction, possibly from JtaTransactionManager.
        logger.debug("Registering Spring transaction synchronization for new Datastore Session");
        SessionHolder holderToUse = sessionHolder;
        if (holderToUse == null) {
            holderToUse = new SessionHolder(session);
        } else {
            holderToUse.addSession(session);
        }
        TransactionSynchronizationManager
                .registerSynchronization(new SpringSessionSynchronization(holderToUse, datastore, true));
        holderToUse.setSynchronizedWithTransaction(true);
        if (holderToUse != sessionHolder) {
            TransactionSynchronizationManager.bindResource(datastore, holderToUse);
        }
    }

    // Check whether we are allowed to return the Session.
    if (!allowCreate && !isSessionTransactional(session, datastore)) {
        closeSession(session);
        throw new IllegalStateException("No Datastore Session bound to thread, "
                + "and configuration does not allow creation of non-transactional one here");
    }

    return session;
}

From source file:org.springframework.integration.sqs.SQSInboundGateway.java

private void postReceive(final String queueName, final com.amazonaws.queue.doc._2009_02_01.Message message) {
    if (!transaction) {
        template.commitReceive(queueName, message);
    } else {/*from  www. j  a va2  s .  c om*/
        final String receiptHandle = message.getReceiptHandle();
        // add commit/delete message to transaction callback
        TransactionSynchronization value = new TransactionSynchronizationAdapter() {
            @Override
            public void beforeCommit(final boolean readOnly) {
                if (readOnly) {
                    log.warn("Skipping commit receive in read only transaction.");
                } else {
                    template.commitReceive(getQueueName(), receiptHandle);
                }
            }
        };
        TransactionSynchronizationManager.registerSynchronization(value);
    }
}

From source file:org.springframework.jca.cci.connection.ConnectionFactoryUtils.java

/**
 * Actually obtain a CCI Connection from the given ConnectionFactory.
 * Same as {@link #getConnection}, but throwing the original ResourceException.
 * <p>Is aware of a corresponding Connection bound to the current thread, for example
 * when using {@link CciLocalTransactionManager}. Will bind a Connection to the thread
 * if transaction synchronization is active (e.g. if in a JTA transaction).
 * <p>Directly accessed by {@link TransactionAwareConnectionFactoryProxy}.
 * @param cf the ConnectionFactory to obtain Connection from
 * @return a CCI Connection from the given ConnectionFactory
 * @throws ResourceException if thrown by CCI API methods
 * @see #doReleaseConnection//w w  w . ja v  a2 s .  co m
 */
public static Connection doGetConnection(ConnectionFactory cf) throws ResourceException {
    Assert.notNull(cf, "No ConnectionFactory specified");

    ConnectionHolder conHolder = (ConnectionHolder) TransactionSynchronizationManager.getResource(cf);
    if (conHolder != null) {
        return conHolder.getConnection();
    }

    logger.debug("Opening CCI Connection");
    Connection con = cf.getConnection();

    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        logger.debug("Registering transaction synchronization for CCI Connection");
        conHolder = new ConnectionHolder(con);
        conHolder.setSynchronizedWithTransaction(true);
        TransactionSynchronizationManager.registerSynchronization(new ConnectionSynchronization(conHolder, cf));
        TransactionSynchronizationManager.bindResource(cf, conHolder);
    }

    return con;
}

From source file:org.springframework.jdbc.datasource.DataSourceUtils.java

/**
 * Actually obtain a JDBC Connection from the given DataSource.
 * Same as {@link #getConnection}, but throwing the original SQLException.
 * <p>Is aware of a corresponding Connection bound to the current thread, for example
 * when using {@link DataSourceTransactionManager}. Will bind a Connection to the thread
 * if transaction synchronization is active (e.g. if in a JTA transaction).
 * <p>Directly accessed by {@link TransactionAwareDataSourceProxy}.
 * @param dataSource the DataSource to obtain Connections from
 * @return a JDBC Connection from the given DataSource
 * @throws SQLException if thrown by JDBC methods
 * @see #doReleaseConnection//from   w ww.j  av a 2 s . co m
 */
public static Connection doGetConnection(DataSource dataSource) throws SQLException {
    Assert.notNull(dataSource, "No DataSource specified");

    ConnectionHolder conHolder = (ConnectionHolder) TransactionSynchronizationManager.getResource(dataSource);
    if (conHolder != null && (conHolder.hasConnection() || conHolder.isSynchronizedWithTransaction())) {
        conHolder.requested();
        if (!conHolder.hasConnection()) {
            logger.debug("Fetching resumed JDBC Connection from DataSource");
            conHolder.setConnection(fetchConnection(dataSource));
        }
        return conHolder.getConnection();
    }
    // Else we either got no holder or an empty thread-bound holder here.

    logger.debug("Fetching JDBC Connection from DataSource");
    Connection con = fetchConnection(dataSource);

    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        logger.debug("Registering transaction synchronization for JDBC Connection");
        // Use same Connection for further JDBC actions within the transaction.
        // Thread-bound object will get removed by synchronization at transaction completion.
        ConnectionHolder holderToUse = conHolder;
        if (holderToUse == null) {
            holderToUse = new ConnectionHolder(con);
        } else {
            holderToUse.setConnection(con);
        }
        holderToUse.requested();
        TransactionSynchronizationManager
                .registerSynchronization(new ConnectionSynchronization(holderToUse, dataSource));
        holderToUse.setSynchronizedWithTransaction(true);
        if (holderToUse != conHolder) {
            TransactionSynchronizationManager.bindResource(dataSource, holderToUse);
        }
    }

    return con;
}

From source file:org.springframework.jdbc.support.lob.LobCreatorUtils.java

/**
 * Register a transaction synchronization for closing the given LobCreator,
 * preferring Spring transaction synchronization and falling back to
 * plain JTA transaction synchronization.
 * @param lobCreator the LobCreator to close after transaction completion
 * @param jtaTransactionManager the JTA TransactionManager to fall back to
 * when no Spring transaction synchronization is active (may be {@code null})
 * @throws IllegalStateException if there is neither active Spring transaction
 * synchronization nor active JTA transaction synchronization
 *//*ww  w.j av  a 2 s . co m*/
public static void registerTransactionSynchronization(LobCreator lobCreator,
        TransactionManager jtaTransactionManager) throws IllegalStateException {

    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        logger.debug("Registering Spring transaction synchronization for LobCreator");
        TransactionSynchronizationManager
                .registerSynchronization(new SpringLobCreatorSynchronization(lobCreator));
    } else {
        if (jtaTransactionManager != null) {
            try {
                int jtaStatus = jtaTransactionManager.getStatus();
                if (jtaStatus == Status.STATUS_ACTIVE || jtaStatus == Status.STATUS_MARKED_ROLLBACK) {
                    logger.debug("Registering JTA transaction synchronization for LobCreator");
                    jtaTransactionManager.getTransaction()
                            .registerSynchronization(new JtaLobCreatorSynchronization(lobCreator));
                    return;
                }
            } catch (Throwable ex) {
                throw new TransactionSystemException(
                        "Could not register synchronization with JTA TransactionManager", ex);
            }
        }
        throw new IllegalStateException("Active Spring transaction synchronization or active "
                + "JTA transaction with specified [javax.transaction.TransactionManager] required");
    }
}

From source file:org.springframework.jms.connection.ConnectionFactoryUtils.java

/**
 * Obtain a JMS Session that is synchronized with the current transaction, if any.
 * @param connectionFactory the JMS ConnectionFactory to bind for
 * (used as TransactionSynchronizationManager key)
 * @param resourceFactory the ResourceFactory to use for extracting or creating
 * JMS resources/*from   www .j  a v a 2 s . c om*/
 * @param startConnection whether the underlying JMS Connection approach should be
 * started in order to allow for receiving messages. Note that a reused Connection
 * may already have been started before, even if this flag is {@code false}.
 * @return the transactional Session, or {@code null} if none found
 * @throws JMSException in case of JMS failure
 */
@Nullable
public static Session doGetTransactionalSession(ConnectionFactory connectionFactory,
        ResourceFactory resourceFactory, boolean startConnection) throws JMSException {

    Assert.notNull(connectionFactory, "ConnectionFactory must not be null");
    Assert.notNull(resourceFactory, "ResourceFactory must not be null");

    JmsResourceHolder resourceHolder = (JmsResourceHolder) TransactionSynchronizationManager
            .getResource(connectionFactory);
    if (resourceHolder != null) {
        Session session = resourceFactory.getSession(resourceHolder);
        if (session != null) {
            if (startConnection) {
                Connection con = resourceFactory.getConnection(resourceHolder);
                if (con != null) {
                    con.start();
                }
            }
            return session;
        }
        if (resourceHolder.isFrozen()) {
            return null;
        }
    }
    if (!TransactionSynchronizationManager.isSynchronizationActive()) {
        return null;
    }
    JmsResourceHolder resourceHolderToUse = resourceHolder;
    if (resourceHolderToUse == null) {
        resourceHolderToUse = new JmsResourceHolder(connectionFactory);
    }
    Connection con = resourceFactory.getConnection(resourceHolderToUse);
    Session session = null;
    try {
        boolean isExistingCon = (con != null);
        if (!isExistingCon) {
            con = resourceFactory.createConnection();
            resourceHolderToUse.addConnection(con);
        }
        session = resourceFactory.createSession(con);
        resourceHolderToUse.addSession(session, con);
        if (startConnection) {
            con.start();
        }
    } catch (JMSException ex) {
        if (session != null) {
            try {
                session.close();
            } catch (Throwable ex2) {
                // ignore
            }
        }
        if (con != null) {
            try {
                con.close();
            } catch (Throwable ex2) {
                // ignore
            }
        }
        throw ex;
    }
    if (resourceHolderToUse != resourceHolder) {
        TransactionSynchronizationManager.registerSynchronization(new JmsResourceSynchronization(
                resourceHolderToUse, connectionFactory, resourceFactory.isSynchedLocalTransactionAllowed()));
        resourceHolderToUse.setSynchronizedWithTransaction(true);
        TransactionSynchronizationManager.bindResource(connectionFactory, resourceHolderToUse);
    }
    return session;
}

From source file:org.springframework.orm.hibernate.SessionFactoryUtils.java

/**
 * Get a Hibernate Session for the given SessionFactory. Is aware of and will
 * return any existing corresponding Session bound to the current thread, for
 * example when using {@link HibernateTransactionManager}. Will create a new
 * Session otherwise, if "allowCreate" is <code>true</code>.
 * @param sessionFactory Hibernate SessionFactory to create the session with
 * @param entityInterceptor Hibernate entity interceptor, or <code>null</code> if none
 * @param jdbcExceptionTranslator SQLExceptionTranslator to use for flushing the
 * Session on transaction synchronization (may be <code>null</code>)
 * @param allowCreate whether a non-transactional Session should be created
 * when no transactional Session can be found for the current thread
 * @return the Hibernate Session/*from  w  w w  . ja va2 s  .co m*/
 * @throws DataAccessResourceFailureException if the Session couldn't be created
 * @throws IllegalStateException if no thread-bound Session found and
 * "allowCreate" is <code>false</code>
 */
private static Session getSession(SessionFactory sessionFactory, Interceptor entityInterceptor,
        SQLExceptionTranslator jdbcExceptionTranslator, boolean allowCreate)
        throws DataAccessResourceFailureException, IllegalStateException {

    Assert.notNull(sessionFactory, "No SessionFactory specified");

    SessionHolder sessionHolder = (SessionHolder) TransactionSynchronizationManager.getResource(sessionFactory);
    if (sessionHolder != null && !sessionHolder.isEmpty()) {
        // pre-bound Hibernate Session
        Session session = null;
        if (TransactionSynchronizationManager.isSynchronizationActive()
                && sessionHolder.doesNotHoldNonDefaultSession()) {
            // Spring transaction management is active ->
            // register pre-bound Session with it for transactional flushing.
            session = sessionHolder.getValidatedSession();
            if (!sessionHolder.isSynchronizedWithTransaction()) {
                logger.debug("Registering Spring transaction synchronization for existing Hibernate Session");
                TransactionSynchronizationManager.registerSynchronization(new SpringSessionSynchronization(
                        sessionHolder, sessionFactory, jdbcExceptionTranslator, false));
                sessionHolder.setSynchronizedWithTransaction(true);
                // Switch to FlushMode.AUTO if we're not within a read-only transaction.
                FlushMode flushMode = session.getFlushMode();
                if (FlushMode.NEVER.equals(flushMode)
                        && !TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
                    session.setFlushMode(FlushMode.AUTO);
                    sessionHolder.setPreviousFlushMode(flushMode);
                }
            }
        } else {
            // No Spring transaction management active -> try JTA transaction synchronization.
            session = getJtaSynchronizedSession(sessionHolder, sessionFactory, jdbcExceptionTranslator);
        }
        if (session != null) {
            return session;
        }
    }

    try {
        logger.debug("Opening Hibernate Session");
        Session session = (entityInterceptor != null ? sessionFactory.openSession(entityInterceptor)
                : sessionFactory.openSession());

        // Set Session to FlushMode.NEVER if we're within a read-only transaction.
        // Use same Session for further Hibernate actions within the transaction.
        // Thread object will get removed by synchronization at transaction completion.
        if (TransactionSynchronizationManager.isSynchronizationActive()) {
            // We're within a Spring-managed transaction, possibly from JtaTransactionManager.
            logger.debug("Registering Spring transaction synchronization for new Hibernate Session");
            SessionHolder holderToUse = sessionHolder;
            if (holderToUse == null) {
                holderToUse = new SessionHolder(session);
            } else {
                holderToUse.addSession(session);
            }
            if (TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
                session.setFlushMode(FlushMode.NEVER);
            }
            TransactionSynchronizationManager.registerSynchronization(new SpringSessionSynchronization(
                    holderToUse, sessionFactory, jdbcExceptionTranslator, true));
            holderToUse.setSynchronizedWithTransaction(true);
            if (holderToUse != sessionHolder) {
                TransactionSynchronizationManager.bindResource(sessionFactory, holderToUse);
            }
        } else {
            // No Spring transaction management active -> try JTA transaction synchronization.
            registerJtaSynchronization(session, sessionFactory, jdbcExceptionTranslator, sessionHolder);
        }

        // Check whether we are allowed to return the Session.
        if (!allowCreate && !isSessionTransactional(session, sessionFactory)) {
            doClose(session);
            throw new IllegalStateException("No Hibernate Session bound to thread, "
                    + "and configuration does not allow creation of non-transactional one here");
        }

        return session;
    } catch (HibernateException ex) {
        throw new DataAccessResourceFailureException("Could not open Hibernate Session", ex);
    }
}

From source file:org.springframework.orm.hibernate.support.AbstractLobType.java

/**
 * This implementation delegates to nullSafeSetInternal,
 * passing in a transaction-synchronized LobCreator for the
 * LobHandler of this type.//from   ww  w.j a va 2  s.c o m
 * @see #nullSafeSetInternal
 */
public final void nullSafeSet(PreparedStatement st, Object value, int index)
        throws HibernateException, SQLException {

    if (this.lobHandler == null) {
        throw new IllegalStateException("No LobHandler found for configuration - "
                + "lobHandler property must be set on LocalSessionFactoryBean");
    }

    LobCreator lobCreator = this.lobHandler.getLobCreator();
    try {
        nullSafeSetInternal(st, index, value, lobCreator);
    } catch (IOException ex) {
        throw new HibernateException("I/O errors during LOB access", ex);
    }
    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        logger.debug("Registering Spring transaction synchronization for Hibernate LOB type");
        TransactionSynchronizationManager
                .registerSynchronization(new SpringLobCreatorSynchronization(lobCreator));
    } else {
        if (this.jtaTransactionManager != null) {
            try {
                int jtaStatus = this.jtaTransactionManager.getStatus();
                if (jtaStatus == Status.STATUS_ACTIVE || jtaStatus == Status.STATUS_MARKED_ROLLBACK) {
                    logger.debug("Registering JTA transaction synchronization for Hibernate LOB type");
                    this.jtaTransactionManager.getTransaction()
                            .registerSynchronization(new JtaLobCreatorSynchronization(lobCreator));
                    return;
                }
            } catch (Exception ex) {
                throw new DataAccessResourceFailureException(
                        "Could not register synchronization with JTA TransactionManager", ex);
            }
        }
        throw new IllegalStateException("Active Spring transaction synchronization or active "
                + "JTA transaction with 'jtaTransactionManager' on LocalSessionFactoryBean required");
    }
}

From source file:org.springframework.orm.hibernate3.SessionFactoryUtils.java

/**
 * Get a Hibernate Session for the given SessionFactory. Is aware of and will
 * return any existing corresponding Session bound to the current thread, for
 * example when using {@link HibernateTransactionManager}. Will create a new
 * Session otherwise, if "allowCreate" is {@code true}.
 * <p>Same as {@link #getSession}, but throwing the original HibernateException.
 * @param sessionFactory Hibernate SessionFactory to create the session with
 * @param entityInterceptor Hibernate entity interceptor, or {@code null} if none
 * @param jdbcExceptionTranslator SQLExcepionTranslator to use for flushing the
 * Session on transaction synchronization (may be {@code null})
 * @param allowCreate whether a non-transactional Session should be created
 * when no transactional Session can be found for the current thread
 * @return the Hibernate Session// w  w w.  j  av a 2s.  com
 * @throws HibernateException if the Session couldn't be created
 * @throws IllegalStateException if no thread-bound Session found and
 * "allowCreate" is {@code false}
 */
private static Session doGetSession(SessionFactory sessionFactory, Interceptor entityInterceptor,
        SQLExceptionTranslator jdbcExceptionTranslator, boolean allowCreate)
        throws HibernateException, IllegalStateException {

    Assert.notNull(sessionFactory, "No SessionFactory specified");

    Object resource = TransactionSynchronizationManager.getResource(sessionFactory);
    if (resource instanceof Session) {
        return (Session) resource;
    }
    SessionHolder sessionHolder = (SessionHolder) resource;
    if (sessionHolder != null && !sessionHolder.isEmpty()) {
        // pre-bound Hibernate Session
        Session session = null;
        if (TransactionSynchronizationManager.isSynchronizationActive()
                && sessionHolder.doesNotHoldNonDefaultSession()) {
            // Spring transaction management is active ->
            // register pre-bound Session with it for transactional flushing.
            session = sessionHolder.getValidatedSession();
            if (session != null && !sessionHolder.isSynchronizedWithTransaction()) {
                logger.debug("Registering Spring transaction synchronization for existing Hibernate Session");
                TransactionSynchronizationManager.registerSynchronization(new SpringSessionSynchronization(
                        sessionHolder, sessionFactory, jdbcExceptionTranslator, false));
                sessionHolder.setSynchronizedWithTransaction(true);
                // Switch to FlushMode.AUTO, as we have to assume a thread-bound Session
                // with FlushMode.MANUAL, which needs to allow flushing within the transaction.
                FlushMode flushMode = session.getFlushMode();
                if (flushMode.lessThan(FlushMode.COMMIT)
                        && !TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
                    session.setFlushMode(FlushMode.AUTO);
                    sessionHolder.setPreviousFlushMode(flushMode);
                }
            }
        } else {
            // No Spring transaction management active -> try JTA transaction synchronization.
            session = getJtaSynchronizedSession(sessionHolder, sessionFactory, jdbcExceptionTranslator);
        }
        if (session != null) {
            return session;
        }
    }

    logger.debug("Opening Hibernate Session");
    Session session = (entityInterceptor != null ? sessionFactory.openSession(entityInterceptor)
            : sessionFactory.openSession());

    // Use same Session for further Hibernate actions within the transaction.
    // Thread object will get removed by synchronization at transaction completion.
    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        // We're within a Spring-managed transaction, possibly from JtaTransactionManager.
        logger.debug("Registering Spring transaction synchronization for new Hibernate Session");
        SessionHolder holderToUse = sessionHolder;
        if (holderToUse == null) {
            holderToUse = new SessionHolder(session);
        } else {
            holderToUse.addSession(session);
        }
        if (TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
            session.setFlushMode(FlushMode.MANUAL);
        }
        TransactionSynchronizationManager.registerSynchronization(
                new SpringSessionSynchronization(holderToUse, sessionFactory, jdbcExceptionTranslator, true));
        holderToUse.setSynchronizedWithTransaction(true);
        if (holderToUse != sessionHolder) {
            TransactionSynchronizationManager.bindResource(sessionFactory, holderToUse);
        }
    } else {
        // No Spring transaction management active -> try JTA transaction synchronization.
        registerJtaSynchronization(session, sessionFactory, jdbcExceptionTranslator, sessionHolder);
    }

    // Check whether we are allowed to return the Session.
    if (!allowCreate && !isSessionTransactional(session, sessionFactory)) {
        closeSession(session);
        throw new IllegalStateException("No Hibernate Session bound to thread, "
                + "and configuration does not allow creation of non-transactional one here");
    }

    return session;
}

From source file:org.springframework.orm.hibernate4.SpringSessionContext.java

/**
 * Retrieve the Spring-managed Session for the current thread, if any.
 *//*from   ww  w  . ja  va 2  s.co  m*/
@Override
public Session currentSession() throws HibernateException {
    Object value = TransactionSynchronizationManager.getResource(this.sessionFactory);
    if (value instanceof Session) {
        return (Session) value;
    } else if (value instanceof SessionHolder) {
        SessionHolder sessionHolder = (SessionHolder) value;
        Session session = sessionHolder.getSession();
        if (!sessionHolder.isSynchronizedWithTransaction()
                && TransactionSynchronizationManager.isSynchronizationActive()) {
            TransactionSynchronizationManager.registerSynchronization(
                    new SpringSessionSynchronization(sessionHolder, this.sessionFactory, false));
            sessionHolder.setSynchronizedWithTransaction(true);
            // Switch to FlushMode.AUTO, as we have to assume a thread-bound Session
            // with FlushMode.MANUAL, which needs to allow flushing within the transaction.
            FlushMode flushMode = session.getFlushMode();
            if (flushMode.equals(FlushMode.MANUAL)
                    && !TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
                session.setFlushMode(FlushMode.AUTO);
                sessionHolder.setPreviousFlushMode(flushMode);
            }
        }
        return session;
    }

    if (this.transactionManager != null) {
        try {
            if (this.transactionManager.getStatus() == Status.STATUS_ACTIVE) {
                Session session = this.jtaSessionContext.currentSession();
                if (TransactionSynchronizationManager.isSynchronizationActive()) {
                    TransactionSynchronizationManager
                            .registerSynchronization(new SpringFlushSynchronization(session));
                }
                return session;
            }
        } catch (SystemException ex) {
            throw new HibernateException("JTA TransactionManager found but status check failed", ex);
        }
    }

    if (TransactionSynchronizationManager.isSynchronizationActive()) {
        Session session = this.sessionFactory.openSession();
        if (TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
            session.setFlushMode(FlushMode.MANUAL);
        }
        SessionHolder sessionHolder = new SessionHolder(session);
        TransactionSynchronizationManager.registerSynchronization(
                new SpringSessionSynchronization(sessionHolder, this.sessionFactory, true));
        TransactionSynchronizationManager.bindResource(this.sessionFactory, sessionHolder);
        sessionHolder.setSynchronizedWithTransaction(true);
        return session;
    } else {
        throw new HibernateException("Could not obtain transaction-synchronized Session for current thread");
    }
}