JTATransactionManager.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services 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 library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
package org.granite.tide.data;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.NotSupportedException;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;

import org.granite.tide.TideTransactionManager;

/**
 * Responsible for attaching a entity with the entity mangager
 * @author cingram
 *
 */
public class JTATransactionManager implements TideTransactionManager {
	
	public static final String USER_TRANSACTION_JNDI = "java:comp/UserTransaction";

	
	public Object begin(TideTransactionPersistenceManager pm) {
        try {
            InitialContext ic = new InitialContext();
            UserTransaction ut = (UserTransaction)ic.lookup(USER_TRANSACTION_JNDI);
            ut.begin();
            return ut;
        }
        catch (NamingException f) {
            throw new RuntimeException("Could not initiate JTA transaction for lazy initialization", f);
        }
        catch (SystemException f) {
            throw new RuntimeException("Could not initiate JTA transaction for lazy initialization", f);
        }
        catch (NotSupportedException f) {
            throw new RuntimeException("Could not initiate JTA transaction for lazy initialization", f);
        }
	}
	
	public void commit(Object tx) throws Exception {
        if (tx instanceof UserTransaction)
            ((UserTransaction)tx).commit();
	}
	
	public void rollback(Object tx) {
	    try {
            if (tx instanceof UserTransaction)
                ((UserTransaction)tx).rollback();
        }
        catch (Exception e) {
            throw new RuntimeException("Unable to rollback attach entity and init collection", e);
        }
	}
}