Rollback.java

/**
 * C-JDBC: Clustered JDBC.
 * Copyright (C) 2002-2005 French National Institute For Research In Computer
 * Science And Control (INRIA).
 * Contact: c-jdbc@objectweb.org
 * 
 * This library 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 any later
 * version.
 * 
 * This library 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * Initial developer(s): Emmanuel Cecchet.
 * Contributor(s): ______________________.
 */

package org.objectweb.cjdbc.controller.virtualdatabase.protocol;

import java.io.Serializable;
import java.sql.SQLException;

import org.objectweb.cjdbc.common.i18n.Translate;
import org.objectweb.cjdbc.common.sql.AbstractRequest;
import org.objectweb.cjdbc.common.sql.UnknownRequest;
import org.objectweb.cjdbc.controller.loadbalancer.AllBackendsFailedException;
import org.objectweb.cjdbc.controller.requestmanager.TransactionMarkerMetaData;
import org.objectweb.cjdbc.controller.requestmanager.distributed.DistributedRequestManager;

/**
 * Execute a distributed rollback.
 * 
 * @author <a href="mailto:Emmanuel.Cecchet@inria.fr">Emmanuel Cecchet </a>
 * @version 1.0
 */
public class Rollback implements Serializable
{

  private long transactionId;

  /**
   * Creates a new <code>Rollback</code> message.
   * 
   * @param transactionId id of the transaction to rollback
   */
  public Rollback(long transactionId)
  {
    this.transactionId = transactionId;
  }

  /**
   * Execution of a distributed rollback command on the specified
   * <code>DistributedRequestManager</code>
   * 
   * @param drm the DistributedRequestManager that will execute the rollback
   * @return Boolean.TRUE if everything went fine or a SQLException if an error
   *         occured
   * @throws SQLException if an error occurs
   */
  public Object rollback(DistributedRequestManager drm) throws SQLException
  {
    try
    {
      Long tid = new Long(transactionId);
      TransactionMarkerMetaData tm = drm.getTransactionMarker(tid);

      // Wait for the scheduler to give us the authorization to execute
      drm.getScheduler().rollback(tm);

      if (drm.getLogger().isDebugEnabled())
        drm.getLogger().debug(Translate.get("transaction.rollback", "" + tid));

      try
      {
        // Send to load balancer
        drm.getLoadBalancer().rollback(tm);

        // Notify the cache
        if (drm.getResultCache() != null)
          drm.getResultCache().rollback(tm.getTransactionId());

        // Notify the recovery log manager
        if (drm.getRecoveryLog() != null)
          drm.getRecoveryLog().rollback(tm);
      }
      catch (SQLException e)
      {
        return e;
      }
      catch (AllBackendsFailedException e)
      {
        AbstractRequest request = new UnknownRequest("rollback", false, 0, "\n");
        request.setTransactionId(transactionId);
        drm.addFailedOnAllBackends(request);
        if (drm.getLogger().isDebugEnabled())
          drm
              .getLogger()
              .debug(
                  Translate
                      .get(
                          "virtualdatabase.distributed.commit.all.backends.locally.failed",
                          transactionId));
        return e;
      }
      finally
      {
        // Notify scheduler for completion
        drm.getScheduler().rollbackCompleted(transactionId);
        drm.completeTransaction(tid);
      }
      return Boolean.TRUE;
    }
    catch (SQLException e)
    {
      drm.getLogger()
          .warn(
              Translate
                  .get("virtualdatabase.distributed.rollback.sqlexception"), e);
      throw e;
    }
    catch (RuntimeException re)
    {
      drm.getLogger().warn(
          Translate.get("virtualdatabase.distributed.rollback.exception"), re);
      throw new SQLException(re.getMessage());
    }
  }

}

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