/**
 * Copyright (c) 2002-2012 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package org.neo4j.cluster.protocol.atomicbroadcast.multipaxos;

import java.util.HashMap;
import java.util.Map;

/**
 * In memory version of an acceptor instance store.
 */
public class InMemoryAcceptorInstanceStore
        implements AcceptorInstanceStore
{
    // TODO Add mechanism to purge these
    Map<InstanceId, AcceptorInstance> instances = new HashMap<InstanceId, AcceptorInstance>();

    @Override
    public AcceptorInstance getAcceptorInstance( InstanceId instanceId )
    {
        AcceptorInstance instance = instances.get( instanceId );
        if ( instance == null )
        {
            instance = new AcceptorInstance();
            instances.put( instanceId, instance );
        }

        return instance;
    }

    @Override
    public void promise( AcceptorInstance instance, long ballot )
    {
        instance.promise( ballot );
    }

    @Override
    public void accept( AcceptorInstance instance, Object value )
    {
        instance.accept( value );
    }

    @Override
    public void clear()
    {
        instances.clear();
    }
}