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LabelScanStoreProvider.java
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LabelScanStoreProvider.java
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/*
* Copyright (c) 2002-2015 "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.impl.api.scan;
import java.io.File;
import java.util.Iterator;
import org.neo4j.helpers.collection.PrefetchingIterator;
import org.neo4j.kernel.api.labelscan.LabelScanStore;
import org.neo4j.kernel.api.labelscan.NodeLabelUpdate;
import org.neo4j.kernel.extension.KernelExtensionFactory;
import org.neo4j.kernel.extension.KernelExtensions;
import org.neo4j.kernel.impl.store.NodeLabelsField;
import org.neo4j.kernel.impl.store.NodeStore;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import org.neo4j.kernel.impl.transaction.state.NeoStoresSupplier;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.lifecycle.Lifecycle;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import static org.neo4j.collection.primitive.PrimitiveLongCollections.EMPTY_LONG_ARRAY;
/**
* Used by a {@link KernelExtensions} to provide access a {@link LabelScanStore} and prioritize against other.
*
* (Kernel extension loading mechanism)-[:FINDS]->(KernelExtensionFactory)-[:THAT_PRODUCES]->(LabelScanStoreProvider)-
* -[:THAT_PROVIDES_ACCESS_TO_AND_PRIORITIZES]->(LabelScanStore)
*
* Explicitly don't forward {@link Lifecycle} calls to the {@link LabelScanStore} itself since this provider
* participates in KernelExtensions' life cycle, but there are assumptions in and around LabelScanStores that
* require its life cycle to be managed by a data source, which has its own little sub-life cycle. I.e. it will
* get the {@link LabelScanStore} from this provider, stick it in an e.g. {@link LifeSupport} of its own.
* {@link LabelScanStoreProvider} implements {@link Lifecycle} to adhere to {@link KernelExtensionFactory} contract.
*/
public class LabelScanStoreProvider extends LifecycleAdapter implements Comparable<LabelScanStoreProvider>
{
private static final String KEY = "lucene";
private final LabelScanStore labelScanStore;
private final int priority;
public LabelScanStoreProvider( LabelScanStore labelScanStore, int priority )
{
this.labelScanStore = labelScanStore;
this.priority = priority;
}
public static File getStoreDirectory( File storeRootDir )
{
return new File( new File( new File( storeRootDir, "schema" ), "label" ), KEY );
}
public LabelScanStore getLabelScanStore()
{
return labelScanStore;
}
@Override
public int compareTo( LabelScanStoreProvider o )
{
return priority - o.priority;
}
@Override
public String toString()
{
return getClass().getSimpleName() + "[" + labelScanStore + ", prio:" + priority + "]";
}
public interface FullStoreChangeStream extends Iterable<NodeLabelUpdate>
{
long highestNodeId();
}
public static FullStoreChangeStream fullStoreLabelUpdateStream( final NeoStoresSupplier neoStoresSupplier )
{
return new FullStoreChangeStream()
{
@Override
public Iterator<NodeLabelUpdate> iterator()
{
return new PrefetchingIterator<NodeLabelUpdate>()
{
private final NodeStore nodeStore = neoStoresSupplier.get().getNodeStore();
private final long highId = nodeStore.getHighestPossibleIdInUse();
private long current;
@Override
protected NodeLabelUpdate fetchNextOrNull()
{
while ( current <= highId )
{
NodeRecord node = nodeStore.forceGetRecord( current++ );
if ( node.inUse() )
{
long[] labels = NodeLabelsField.parseLabelsField( node ).get( nodeStore );
if ( labels.length > 0 )
{
return NodeLabelUpdate.labelChanges( node.getId(), EMPTY_LONG_ARRAY, labels );
}
}
}
return null;
}
};
}
@Override
public long highestNodeId()
{
return neoStoresSupplier.get().getNodeStore().getHighestPossibleIdInUse();
}
};
}
}