Hibernate example source code file (JtaIsolationDelegate.java)

This example Hibernate source code file (JtaIsolationDelegate.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

exception, hibernateexception, hibernateexception, jdbc, jta, jta, jtaisolationdelegate, sql, surrounding, systemexception, t, t, throwable, transaction, transactionmanager, unable, unable

The Hibernate JtaIsolationDelegate.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.engine.transaction.internal.jta;

import java.sql.Connection;
import java.sql.SQLException;
import javax.transaction.NotSupportedException;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import org.hibernate.HibernateException;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.engine.jdbc.spi.SqlExceptionHelper;
import org.hibernate.engine.transaction.spi.IsolationDelegate;
import org.hibernate.engine.transaction.spi.TransactionCoordinator;
import org.hibernate.jdbc.WorkExecutorVisitable;
import org.hibernate.jdbc.WorkExecutor;
import org.hibernate.service.jdbc.connections.spi.ConnectionProvider;

import org.jboss.logging.Logger;

/**
 * An isolation delegate for JTA environments.
 *
 * @author Steve Ebersole
 */
public class JtaIsolationDelegate implements IsolationDelegate {

    private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, JtaIsolationDelegate.class.getName());

	private final TransactionCoordinator transactionCoordinator;

	public JtaIsolationDelegate(TransactionCoordinator transactionCoordinator) {
		this.transactionCoordinator = transactionCoordinator;
	}

	protected TransactionManager transactionManager() {
		return transactionCoordinator.getTransactionContext()
				.getTransactionEnvironment()
				.getJtaPlatform()
				.retrieveTransactionManager();
	}

	protected ConnectionProvider connectionProvider() {
		return transactionCoordinator.getTransactionContext()
				.getTransactionEnvironment()
				.getJdbcServices()
				.getConnectionProvider();
	}

	protected SqlExceptionHelper sqlExceptionHelper() {
		return transactionCoordinator.getTransactionContext()
				.getTransactionEnvironment()
				.getJdbcServices()
				.getSqlExceptionHelper();
	}

	@Override
	public <T> T delegateWork(WorkExecutorVisitable work, boolean transacted) throws HibernateException {
		TransactionManager transactionManager = transactionManager();

		try {
			// First we suspend any current JTA transaction
			Transaction surroundingTransaction = transactionManager.suspend();
            LOG.debugf("Surrounding JTA transaction suspended [%s]", surroundingTransaction);

			boolean hadProblems = false;
			try {
				// then perform the requested work
				if ( transacted ) {
					return doTheWorkInNewTransaction( work, transactionManager );
				}
				else {
					return doTheWorkInNoTransaction( work );
				}
			}
			catch ( HibernateException e ) {
				hadProblems = true;
				throw e;
			}
			finally {
				try {
					transactionManager.resume( surroundingTransaction );
                    LOG.debugf( "Surrounding JTA transaction resumed [%s]", surroundingTransaction );
				}
				catch( Throwable t ) {
					// if the actually work had an error use that, otherwise error based on t
					if ( !hadProblems ) {
						//noinspection ThrowFromFinallyBlock
						throw new HibernateException( "Unable to resume previously suspended transaction", t );
					}
				}
			}
		}
		catch ( SystemException e ) {
			throw new HibernateException( "Unable to suspend current JTA transaction", e );
		}
	}

	private <T> T doTheWorkInNewTransaction(WorkExecutorVisitable work, TransactionManager transactionManager) {
		T result = null;
		try {
			// start the new isolated transaction
			transactionManager.begin();

			try {
				result = doTheWork( work );
				// if everything went ok, commit the isolated transaction
				transactionManager.commit();
			}
			catch ( Exception e ) {
				try {
					transactionManager.rollback();
				}
				catch ( Exception ignore ) {
                    LOG.unableToRollbackIsolatedTransaction(e, ignore);
				}
			}
		}
		catch ( SystemException e ) {
			throw new HibernateException( "Unable to start isolated transaction", e );
		}
		catch ( NotSupportedException e ) {
			throw new HibernateException( "Unable to start isolated transaction", e );
		}
		return result;
	}

	private <T> T doTheWorkInNoTransaction(WorkExecutorVisitable work) {
		return doTheWork( work );
	}

	private <T> T doTheWork(WorkExecutorVisitable work) {
		try {
			// obtain our isolated connection
			Connection connection = connectionProvider().getConnection();
			try {
				// do the actual work
				return work.accept( new WorkExecutor<T>(), connection );
			}
			catch ( HibernateException e ) {
				throw e;
			}
			catch ( Exception e ) {
				throw new HibernateException( "Unable to perform isolated work", e );
			}
			finally {
				try {
					// no matter what, release the connection (handle)
					connectionProvider().closeConnection( connection );
				}
				catch ( Throwable ignore ) {
                    LOG.unableToReleaseIsolatedConnection(ignore);
				}
			}
		}
		catch ( SQLException e ) {
			throw sqlExceptionHelper().convert( e, "unable to obtain isolated JDBC connection" );
		}
	}
}