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Hibernate based replication service
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/*
 * #%L
 * ToPIA :: Service Replication
 * 
 * $Id: Duplicate.java 2301 2011-06-21 07:35:52Z tchemit $
 * $HeadURL: http://svn.nuiton.org/svn/topia/tags/topia-2.6.6/topia-service-replication/src/main/java/org/nuiton/topia/replication/operation/Duplicate.java $
 * %%
 * Copyright (C) 2004 - 2010 CodeLutin
 * %%
 * This program 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 3 of the 
 * License, or (at your option) any later version.
 * 
 * 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * .
 * #L%
 */

package org.nuiton.topia.replication.operation;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.nuiton.topia.TopiaException;
import org.nuiton.topia.framework.TopiaContextImplementor;
import org.nuiton.topia.persistence.TopiaDAO;
import org.nuiton.topia.persistence.TopiaEntity;
import org.nuiton.topia.replication.TopiaReplicationContext;
import org.nuiton.topia.replication.TopiaReplicationOperationUndoable;
import org.nuiton.topia.replication.model.ReplicationModel;
import org.nuiton.topia.replication.model.ReplicationNode;
import org.nuiton.topia.replication.model.ReplicationOperationDef;
import org.nuiton.topia.replication.model.ReplicationOperationPhase;

import java.util.List;

/**
 * L'operation de duplication d'un noeud de replication.
 * 
 * Note : cette operation est interne, et n'est pas creable par
 * l'utilisateur via la methode
 * {@link #register(ReplicationModel, ReplicationNode, ReplicationOperationPhase, Object...)}.
 *
 * @author tchemit 
 * @since 2.2.0
 */
public class Duplicate implements TopiaReplicationOperationUndoable {


    /**
     * Logger
     */
    private static final Log log =
            LogFactory.getLog(Duplicate.class);

    @Override
    public void register(ReplicationModel model,
                         ReplicationNode ownerNode,
                         ReplicationOperationPhase phase,
                         Object... parameters) throws UnsupportedOperationException {
//        throw new UnsupportedOperationException(
//                _("topia.replication.error.operation.uncreatable", getClass()));
    }

    @Override
    public void run(TopiaReplicationContext replicationContext,
                    ReplicationOperationDef operationDef,
                    TopiaContextImplementor srcCtxt,
                    TopiaContextImplementor dstCtxt,
                    List entities) throws TopiaException {

        // fix http://nuiton.org/issues/1547
        //FIXME tchemit-2011-06-03 : while using hibernate 3.5.6, while duplicating entities we can have some associations in double sessions
        //FIXME This hack works but it should be better to resolve the bug :( perharps this is not possible
        //FIXME since we can not have a fresh empty hibernate session...
        srcCtxt.getHibernate().clear();
        
        // replication des donnees vers la destination
        srcCtxt.replicateEntities(dstCtxt, entities);

        // sauvegarde de la destination
        dstCtxt.commitTransaction();
    }


    @Override
    public void rollback(ReplicationOperationDef operationDef,
                         TopiaReplicationContext replicationContext,
                         TopiaContextImplementor dstCtxt) throws Exception {

        List ids =
                replicationContext.getEntityIds(operationDef.getNode());

        if (CollectionUtils.isEmpty(ids)) {

            // rien a supprimer
            return;
        }

        Class entityClass = operationDef.getEntityType();
        TopiaDAO dao =
                (TopiaDAO) dstCtxt.getDAO(entityClass);

        List allIds = dao.findAllIds();
        try {
            for (String id : ids) {
                if (allIds.contains(id)) {

                    // on peut supprimer cette entité
                    log.info("Will delete " + id);
                    TopiaEntity entity = dao.findByTopiaId(id);
                    dao.delete(entity);
                }
            }
        } finally {
            allIds.clear();

            // commit des suppressions
            dstCtxt.commitTransaction();
        }
    }
}