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LuceneLabelScanStoreExtension.java
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LuceneLabelScanStoreExtension.java
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/*
* Copyright (c) 2002-2017 "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 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 Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api.impl.labelscan;
import java.util.function.Supplier;
import org.neo4j.helpers.Service;
import org.neo4j.kernel.NeoStoreDataSource;
import org.neo4j.kernel.api.impl.index.storage.DirectoryFactory;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.extension.KernelExtensionFactory;
import org.neo4j.kernel.impl.api.index.IndexStoreView;
import org.neo4j.kernel.impl.api.scan.FullLabelStream;
import org.neo4j.kernel.impl.api.scan.LabelScanStoreProvider;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.kernel.impl.spi.KernelContext;
import org.neo4j.kernel.lifecycle.Lifecycle;
import static org.neo4j.kernel.api.impl.index.LuceneKernelExtensions.directoryFactory;
import static org.neo4j.kernel.api.labelscan.LabelScanStore.Monitor;
@Service.Implementation(KernelExtensionFactory.class)
public class LuceneLabelScanStoreExtension extends KernelExtensionFactory<LuceneLabelScanStoreExtension.Dependencies>
{
private final int priority;
private final Monitor monitor;
public interface Dependencies
{
Config getConfig();
/**
* @return a {@link Supplier} of {@link IndexStoreView}, sort of like a delayed dependency lookup.
* This is because we need the {@link IndexStoreView} dependency, although at the stage where we
* grab dependencies, in {@link Lifecycle#init() init} that is, the {@link NeoStoreDataSource} hasn't been
* {@link Lifecycle#start() started} yet and so haven't provided it.
*/
Supplier<IndexStoreView> indexStoreView();
LogService getLogService();
}
public LuceneLabelScanStoreExtension()
{
this( 10, null );
}
LuceneLabelScanStoreExtension( int priority, Monitor monitor )
{
super( "lucene-scan-store");
this.priority = priority;
this.monitor = (monitor == null) ? Monitor.EMPTY : monitor;
}
@Override
public LabelScanStoreProvider newInstance( KernelContext context, Dependencies dependencies ) throws Throwable
{
boolean ephemeral = dependencies.getConfig().get( GraphDatabaseFacadeFactory.Configuration.ephemeral );
DirectoryFactory directoryFactory = directoryFactory( ephemeral, context.fileSystem() );
LabelScanIndex index = getLuceneIndex( context, directoryFactory );
LuceneLabelScanStore scanStore = new LuceneLabelScanStore( index,
new FullLabelStream( dependencies.indexStoreView() ),
dependencies.getLogService().getInternalLogProvider(), monitor );
return new LabelScanStoreProvider( scanStore, priority );
}
private LabelScanIndex getLuceneIndex( KernelContext context, DirectoryFactory directoryFactory )
{
return LuceneLabelScanIndexBuilder.create()
.withDirectoryFactory( directoryFactory )
.withFileSystem( context.fileSystem() )
.withIndexRootFolder( LabelScanStoreProvider.getStoreDirectory( context.storeDir() ) )
.build();
}
}