Hibernate example source code file (JdbcIsolationDelegate.java)

This example Hibernate source code file (JdbcIsolationDelegate.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

connection, exception, exception, hibernateexception, hibernateexception, isolationdelegate, jdbc, jdbcisolationdelegate, sql, sqlexception, sqlexception, sqlexceptionhelper, t, t, transactioncoordinator, workexecutor

The Hibernate JdbcIsolationDelegate.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.jdbc;

import java.sql.Connection;
import java.sql.SQLException;
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;

/**
 * The isolation delegate for JDBC {@link Connection} based transactions
 *
 * @author Steve Ebersole
 */
public class JdbcIsolationDelegate implements IsolationDelegate {

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

	private final TransactionCoordinator transactionCoordinator;

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

	protected ConnectionProvider connectionProvider() {
		return transactionCoordinator.getJdbcCoordinator().getLogicalConnection().getJdbcServices().getConnectionProvider();
	}

	protected SqlExceptionHelper sqlExceptionHelper() {
		return transactionCoordinator.getJdbcCoordinator().getLogicalConnection().getJdbcServices().getSqlExceptionHelper();
	}

	@Override
	public <T> T delegateWork(WorkExecutorVisitable work, boolean transacted) throws HibernateException {
		boolean wasAutoCommit = false;
		try {
			// todo : should we use a connection proxy here?
			Connection connection = connectionProvider().getConnection();
			try {
				if ( transacted ) {
					if ( connection.getAutoCommit() ) {
						wasAutoCommit = true;
						connection.setAutoCommit( false );
					}
				}

				T result = work.accept( new WorkExecutor<T>(), connection );

				if ( transacted ) {
					connection.commit();
				}

				return result;
			}
			catch ( Exception e ) {
				try {
					if ( transacted && !connection.isClosed() ) {
						connection.rollback();
					}
				}
				catch ( Exception ignore ) {
                    LOG.unableToRollbackConnection(ignore);
				}

				if ( e instanceof HibernateException ) {
					throw (HibernateException) e;
				}
				else if ( e instanceof SQLException ) {
					throw sqlExceptionHelper().convert( (SQLException) e, "error performing isolated work" );
				}
				else {
					throw new HibernateException( "error performing isolated work", e );
				}
			}
			finally {
				if ( transacted && wasAutoCommit ) {
					try {
						connection.setAutoCommit( true );
					}
					catch ( Exception ignore ) {
                        LOG.trace("was unable to reset connection back to auto-commit");
					}
				}
				try {
					connectionProvider().closeConnection( connection );
				}
				catch ( Exception ignore ) {
                    LOG.unableToReleaseIsolatedConnection(ignore);
				}
			}
		}
		catch ( SQLException sqle ) {
			throw sqlExceptionHelper().convert( sqle, "unable to obtain isolated JDBC connection" );
		}
	}
}