com.db4o.drs.test.hibernate.RoundRobinWithManyProviders.java Source code

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Here is the source code for com.db4o.drs.test.hibernate.RoundRobinWithManyProviders.java

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/* Copyright (C) 2004 - 2008  Versant Inc.  http://www.db4o.com
    
This file is part of the db4o open source object database.
    
db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.
    
db4o 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 Public License
for more details.
    
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
package com.db4o.drs.test.hibernate;

import org.hibernate.cfg.Configuration;

import com.db4o.ObjectSet;
import com.db4o.drs.Replication;
import com.db4o.drs.ReplicationEvent;
import com.db4o.drs.ReplicationEventListener;
import com.db4o.drs.ReplicationSession;
import com.db4o.drs.hibernate.impl.HibernateReplicationProvider;
import com.db4o.drs.test.DrsTestCase;
import com.db4o.drs.test.data.*;

public class RoundRobinWithManyProviders extends DrsTestCase {

    HibernateReplicationProvider providerC;

    public void test() {
        initProviderC();

        replicateAB();
        replicateBC();
        replicateCA();
    }

    private void initProviderC() {
        Configuration configC = HibernateUtil.createNewDbConfig();
        configC.addClass(Pilot.class);
        providerC = new HibernateReplicationProvider(configC);
    }

    private void replicateAB() {
        Pilot pilot1 = new Pilot("Scott Felton", 200);
        a().provider().storeNew(pilot1);
        a().provider().commit();

        replicateAll(a().provider(), b().provider());
    }

    private void replicateBC() {
        ReplicationSession sess = Replication.begin(b().provider(), providerC);

        ObjectSet changed = sess.providerA().objectsChangedSinceLastReplication();
        while (changed.hasNext())
            sess.replicate(changed.next());

        sess.commit();
    }

    private void replicateCA() {
        ReplicationEventListener resolver = new ReplicationEventListener() {
            public void onReplicate(ReplicationEvent e) {
                if (e.isConflict()) {
                    // System.out.println("Conflict because C and A are never
                    // replicated.So they don't have a replication record. This
                    // makes both providers think the Pilot object was modified.
                    // ");
                    e.overrideWith(e.stateInProviderA());
                }
            }

        };
        ReplicationSession sess = Replication.begin(providerC, a().provider(), resolver);

        ObjectSet changed2 = sess.providerA().objectsChangedSinceLastReplication();
        while (changed2.hasNext())
            sess.replicate(changed2.next());

        sess.commit();
    }
}