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SchemaIndexExtensionLoader.java
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SchemaIndexExtensionLoader.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.consistency.internal;
import java.io.File;
import org.neo4j.helpers.Service;
import org.neo4j.index.internal.gbptree.CleanupJob;
import org.neo4j.index.internal.gbptree.RecoveryCleanupWorkCollector;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.api.index.SchemaIndexProvider;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.extension.KernelExtensionFactory;
import org.neo4j.kernel.extension.KernelExtensions;
import org.neo4j.kernel.extension.UnsatisfiedDependencyStrategies;
import org.neo4j.kernel.extension.dependency.AllByPrioritySelectionStrategy;
import org.neo4j.kernel.impl.api.index.SchemaIndexProviderMap;
import org.neo4j.kernel.impl.factory.DatabaseInfo;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.kernel.impl.spi.KernelContext;
import org.neo4j.kernel.impl.spi.SimpleKernelContext;
import org.neo4j.kernel.impl.transaction.state.DefaultSchemaIndexProviderMap;
import org.neo4j.kernel.impl.util.Dependencies;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
/**
* Utility for loading {@link SchemaIndexProvider} instances from {@link KernelExtensions}.
*/
public class SchemaIndexExtensionLoader
{
/**
* Used in scenarios where recovery isn't allowed.
*/
public static final RecoveryCleanupWorkCollector RECOVERY_PREVENTING_COLLECTOR = new RecoveryPreventingCollector();
public static SchemaIndexProviderMap loadSchemaIndexProviders( KernelExtensions extensions )
{
AllByPrioritySelectionStrategy<SchemaIndexProvider> indexProviderSelection = new AllByPrioritySelectionStrategy<>();
SchemaIndexProvider defaultIndexProvider =
extensions.resolveDependency( SchemaIndexProvider.class, indexProviderSelection );
return new DefaultSchemaIndexProviderMap( defaultIndexProvider,
indexProviderSelection.lowerPrioritizedCandidates() );
}
@SuppressWarnings( "unchecked" )
public static KernelExtensions instantiateKernelExtensions( File storeDir, FileSystemAbstraction fileSystem,
Config config, LogService logService, PageCache pageCache,
RecoveryCleanupWorkCollector recoveryCollector, DatabaseInfo databaseInfo )
{
Dependencies deps = new Dependencies();
deps.satisfyDependencies( fileSystem, config, logService, pageCache, recoveryCollector );
@SuppressWarnings( "rawtypes" )
Iterable kernelExtensions = Service.load( KernelExtensionFactory.class );
KernelContext kernelContext = new SimpleKernelContext( storeDir, databaseInfo, deps );
return new KernelExtensions( kernelContext, kernelExtensions, deps, UnsatisfiedDependencyStrategies.ignore() );
}
private static class RecoveryPreventingCollector extends LifecycleAdapter implements RecoveryCleanupWorkCollector
{
@Override
public void add( CleanupJob job )
{
if ( job.needed() )
{
throw new IllegalStateException( "Consistency checker should not do recovery" );
}
}
}
}