/*
    * Copyright (c) 2002-2014, Mairie de Paris
    * 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
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS 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 COPYRIGHT HOLDERS OR 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.
   *
   * License 1.0
   */
  package fr.paris.lutece.util.jpa.transaction;
  
  import fr.paris.lutece.util.jpa.JPAConstants;
  
  import org.apache.log4j.Logger;
  
  import org.springframework.transaction.PlatformTransactionManager;
  import org.springframework.transaction.TransactionDefinition;
  import org.springframework.transaction.TransactionException;
  import org.springframework.transaction.TransactionStatus;
  import org.springframework.transaction.support.TransactionSynchronizationManager;
  
  import java.util.Collections;
  import java.util.List;
  
  
  /**
   *
   * Manages multi transaction
   * @see {@link http://www.javaworld.com/javaworld/jw-01-2009/jw-01-spring-transactions.html?page=6}
   *
   */
  public class ChainedTransactionManager implements PlatformTransactionManager
  {
      private static final Logger _log = Logger.getLogger( JPAConstants.JPA_LOGGER );
      private List<PlatformTransactionManager> _transactionManagers;
  
      /**
       * Builds a new ChainedTransactionManager
       */
      public ChainedTransactionManager(  )
      {
      }
  
      /**
       * Begin a transaction for all transaction managers {@inheritDoc}
       */
      public TransactionStatus getTransaction( TransactionDefinition definition )
          throws TransactionException
      {
          if ( _transactionManagers.isEmpty(  ) )
          {
              return null;
          }
  
          MultiTransactionStatus mts = new MultiTransactionStatus( _transactionManagers.get( 0 ) );
  
          if ( !TransactionSynchronizationManager.isSynchronizationActive(  ) )
          {
              TransactionSynchronizationManager.initSynchronization(  );
              mts.setNewSynchonization(  );
  
              if ( _log.isDebugEnabled(  ) )
              {
                  _log.debug( "Begin transaction : " + mts.toString(  ) );
              }
          }
  
          for ( PlatformTransactionManager transactionManager : _transactionManagers )
          {
              mts.getTransactionStatuses(  ).put( transactionManager, transactionManager.getTransaction( definition ) );
          }
  
          return mts;
      }
  
     /**
      *
      * {@inheritDoc}
      */
     public void commit( TransactionStatus status ) throws TransactionException
     {
         for ( PlatformTransactionManager transactionManager : _transactionManagers )
         {
             TransactionStatus transactionStatus = null;
 
             try
             {
                 transactionStatus = ( (MultiTransactionStatus) status ).getTransactionStatus( transactionManager );
                 transactionManager.commit( transactionStatus );
             }
             catch ( Exception e )
             {
                 _log.error( e.getMessage(  ), e );
 
                 // transactionManager.rollback( transactionStatus );
             }
         }
 
         if ( _log.isDebugEnabled(  ) )
         {
             _log.debug( "Ending transaction : " + status.toString(  ) );
         }
 
         if ( ( (MultiTransactionStatus) status ).isNewSynchonization(  ) )
         {
             TransactionSynchronizationManager.clear(  );
         }
     }
 
     /**
      *
      * {@inheritDoc}
      */
     public void rollback( TransactionStatus status ) throws TransactionException
     {
         for ( PlatformTransactionManager dataSourceManager : _transactionManagers )
         {
             try
             {
                 dataSourceManager.rollback( ( ( (MultiTransactionStatus) status ).getTransactionStatus( 
                         dataSourceManager ) ) );
             }
             catch ( Exception ex )
             {
                 _log.error( ex.getMessage(  ), ex );
             }
         }
 
         if ( ( (MultiTransactionStatus) status ).isNewSynchonization(  ) )
         {
             TransactionSynchronizationManager.clear(  );
         }
     }
 
     /**
      * "Getter method" pour la variable {@link #_transactionManagers}
      * @return La variable {@link #_transactionManagers}
      */
     public List<PlatformTransactionManager> getTransactionManagers(  )
     {
         return _transactionManagers;
     }
 
     /**
      * "Setter method" pour la variable {@link #_transactionManagers}
      * @param managers La nouvelle valeur de la variable {@link #_transactionManagers}
      */
     public void setTransactionManagers( List<PlatformTransactionManager> managers )
     {
         if ( ( managers == null ) || managers.isEmpty(  ) )
         {
             _transactionManagers = Collections.emptyList(  );
         }
         else
         {
             _transactionManagers = managers;
 
             if ( _log.isDebugEnabled(  ) )
             {
                 _log.debug( "Transaction Managers : " + _transactionManagers.toString(  ) );
             }
         }
     }
 }