EmbeddedDatabaseService.java

/*
 * Copyright (c) 2011, Rickard Öberg. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package org.qi4j.library.neo4j;

import java.io.File;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import org.qi4j.api.activation.ActivatorAdapter;
import org.qi4j.api.activation.Activators;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.injection.scope.Uses;
import org.qi4j.api.mixin.Mixins;
import org.qi4j.api.service.ServiceComposite;
import org.qi4j.api.service.ServiceDescriptor;
import org.qi4j.api.service.ServiceReference;
import org.qi4j.library.fileconfig.FileConfiguration;

/**
 * TODO
 */
@Mixins(EmbeddedDatabaseService.Mixin.class)
@Activators( EmbeddedDatabaseService.Activator.class )
public interface EmbeddedDatabaseService
    extends ServiceComposite
{
    void startDatabase()
            throws Exception;
    
    void stopDatabase()
            throws Exception;
    
    GraphDatabaseService database();
    
    class Activator
            extends ActivatorAdapter<ServiceReference<EmbeddedDatabaseService>>
    {

        @Override
        public void afterActivation( ServiceReference<EmbeddedDatabaseService> activated )
                throws Exception
        {
            activated.get().startDatabase();
        }

        @Override
        public void beforePassivation( ServiceReference<EmbeddedDatabaseService> passivating )
                throws Exception
        {
            passivating.get().stopDatabase();
        }
        
    }

    abstract class Mixin
        implements EmbeddedDatabaseService
    {
        @Service
        FileConfiguration config;

        @Uses
        ServiceDescriptor descriptor;

        EmbeddedGraphDatabase db;

        @Override
        public void startDatabase()
            throws Exception
        {
            String path = new File( config.dataDirectory(), identity().get() ).getAbsolutePath();
            db = new EmbeddedGraphDatabase( path );
        }

        @Override
        public void stopDatabase()
            throws Exception
        {
            db.shutdown();
        }
        
        @Override
        public GraphDatabaseService database()
        {
            return db;
        }

    }
}