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ExternallyManagedPageCache.java
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ExternallyManagedPageCache.java
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/*
* Copyright (c) 2002-2018 "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.com.storecopy;
import java.io.File;
import java.io.IOException;
import java.nio.file.OpenOption;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.FileHandle;
import org.neo4j.io.pagecache.IOLimiter;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.io.pagecache.PagedFile;
import org.neo4j.io.pagecache.tracing.cursor.context.VersionContextSupplier;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.extension.KernelExtensionFactory;
import org.neo4j.kernel.impl.enterprise.EnterpriseEditionModule;
import org.neo4j.kernel.impl.factory.DatabaseInfo;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacade;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory;
import org.neo4j.kernel.impl.factory.PlatformModule;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.kernel.monitoring.tracing.Tracers;
/**
* A PageCache implementation that delegates to another page cache, whose life cycle is managed elsewhere.
*
* This page cache implementation DOES NOT delegate close() method calls, so it can be used to safely share a page
* cache with a component that might try to close the page cache it gets.
*/
public class ExternallyManagedPageCache implements PageCache
{
private final PageCache delegate;
private ExternallyManagedPageCache( PageCache delegate )
{
this.delegate = delegate;
}
@Override
public void close()
{
// Don't close the delegate, because we are not in charge of its life cycle.
}
@Override
public PagedFile map( File file, int pageSize, OpenOption... openOptions ) throws IOException
{
return delegate.map( file, pageSize, openOptions );
}
@Override
public Optional<PagedFile> getExistingMapping( File file ) throws IOException
{
return delegate.getExistingMapping( file );
}
@Override
public List<PagedFile> listExistingMappings() throws IOException
{
return delegate.listExistingMappings();
}
@Override
public void flushAndForce() throws IOException
{
delegate.flushAndForce();
}
@Override
public void flushAndForce( IOLimiter limiter ) throws IOException
{
delegate.flushAndForce( limiter );
}
@Override
public int pageSize()
{
return delegate.pageSize();
}
@Override
public int maxCachedPages()
{
return delegate.maxCachedPages();
}
@Override
public Stream<FileHandle> streamFilesRecursive( File directory ) throws IOException
{
return delegate.streamFilesRecursive( directory );
}
/**
* Create a GraphDatabaseFactory that will build EmbeddedGraphDatabase instances that all use the given page cache.
*/
public static GraphDatabaseFactoryWithPageCacheFactory graphDatabaseFactoryWithPageCache( final PageCache delegatePageCache )
{
return new GraphDatabaseFactoryWithPageCacheFactory( delegatePageCache);
}
public static class GraphDatabaseFactoryWithPageCacheFactory extends GraphDatabaseFactory
{
private final PageCache delegatePageCache;
GraphDatabaseFactoryWithPageCacheFactory( PageCache delegatePageCache )
{
this.delegatePageCache = delegatePageCache;
}
@Override
protected GraphDatabaseService newDatabase( File storeDir, Config config,
GraphDatabaseFacadeFactory.Dependencies dependencies )
{
return new GraphDatabaseFacadeFactory( DatabaseInfo.ENTERPRISE, EnterpriseEditionModule::new )
{
@Override
protected PlatformModule createPlatform( File storeDir, Config config, Dependencies dependencies,
GraphDatabaseFacade graphDatabaseFacade )
{
return new PlatformModule( storeDir, config, databaseInfo, dependencies, graphDatabaseFacade )
{
@Override
protected PageCache createPageCache( FileSystemAbstraction fileSystem, Config config, LogService logging,
Tracers tracers, VersionContextSupplier versionContextSupplier )
{
return new ExternallyManagedPageCache( delegatePageCache );
}
};
}
}.newFacade( storeDir, config, dependencies );
}
public GraphDatabaseFactoryWithPageCacheFactory setKernelExtensions( Iterable<KernelExtensionFactory<?>> newKernelExtensions )
{
getCurrentState().setKernelExtensions( newKernelExtensions );
return this;
}
}
}