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Cayenne Object Persistence Framework
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/* ====================================================================
 * 
 * The ObjectStyle Group Software License, version 1.1
 * ObjectStyle Group - http://objectstyle.org/
 * 
 * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
 * of the software. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if any,
 *    must include the following acknowlegement:
 *    "This product includes software developed by independent contributors
 *    and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
 *    or promote products derived from this software without prior written
 *    permission. For written permission, email
 *    "andrus at objectstyle dot org".
 * 
 * 5. Products derived from this software may not be called "ObjectStyle"
 *    or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
 *    names without prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals and hosted on ObjectStyle Group web site.  For more
 * information on the ObjectStyle Group, please see
 * .
 */
package org.objectstyle.cayenne.access;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Iterator;

import org.objectstyle.cayenne.CayenneException;

/**
 * Represents a Cayenne-managed local Transaction.
 * 
 * @since 1.2 moved to a top-level class.
 * @author Andrus Adamchik
 */
class InternalTransaction extends ExternalTransaction {

    InternalTransaction(TransactionDelegate delegate) {
        super(delegate);
    }

    public void begin() {
        super.begin();
        QueryLogger.logBeginTransaction("transaction started.");
    }

    void fixConnectionState(Connection connection) throws SQLException {
        if (connection.getAutoCommit()) {
            // some DBs are very particular about that, (e.g. Informix SE 7.0 per
            // CAY-179), so do a try-catch and ignore exception

            // TODO: maybe allow adapter to provide transaction instance?
            try {
                connection.setAutoCommit(false);
            }
            catch (SQLException cay179Ex) {
                // Can't set autocommit, ignoring...
            }
        }
    }

    void processCommit() throws SQLException, CayenneException {
        status = Transaction.STATUS_COMMITTING;

        if (connections != null && connections.size() > 0) {
            Throwable deferredException = null;
            Iterator it = connections.values().iterator();
            while (it.hasNext()) {
                Connection connection = (Connection) it.next();
                try {

                    if (deferredException == null) {
                        connection.commit();
                    }
                    else {
                        // we must do a partial rollback if only to cleanup
                        // uncommitted
                        // connections.
                        connection.rollback();
                    }

                }
                catch (Throwable th) {
                    // there is no such thing as "partial" rollback in real
                    // transactions, so we can't set any meaningful status.
                    // status = ?;
                    setRollbackOnly();

                    // stores last exception
                    // TODO: chain exceptions...
                    deferredException = th;
                }
            }

            if (deferredException != null) {
                QueryLogger.logRollbackTransaction("transaction rolledback.");
                if (deferredException instanceof SQLException) {
                    throw (SQLException) deferredException;
                }
                else {
                    throw new CayenneException(deferredException);
                }
            }
            else {
                QueryLogger.logCommitTransaction("transaction committed.");
            }
        }
    }

    void processRollback() throws SQLException, CayenneException {
        status = Transaction.STATUS_ROLLING_BACK;

        if (connections != null && connections.size() > 0) {
            Throwable deferredException = null;

            Iterator it = connections.values().iterator();
            while (it.hasNext()) {
                Connection connection = (Connection) it.next();

                try {
                    // continue with rollback even if an exception was thrown before
                    connection.rollback();
                }
                catch (Throwable th) {
                    // stores last exception
                    // TODO: chain exceptions...
                    deferredException = th;
                }
            }

            if (deferredException != null) {
                if (deferredException instanceof SQLException) {
                    throw (SQLException) deferredException;
                }
                else {
                    throw new CayenneException(deferredException);
                }
            }
        }
    }
}