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LuceneIndexAccessor.java
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LuceneIndexAccessor.java
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/*
* Copyright (c) 2002-2016 "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.index;
import java.io.File;
import java.io.IOException;
import org.neo4j.collection.primitive.PrimitiveLongSet;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.helpers.collection.BoundedIterable;
import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;
import org.neo4j.kernel.api.index.IndexAccessor;
import org.neo4j.kernel.api.index.IndexUpdater;
import org.neo4j.kernel.api.index.NodePropertyUpdate;
import org.neo4j.kernel.impl.api.index.IndexUpdateMode;
import org.neo4j.storageengine.api.schema.IndexReader;
public class LuceneIndexAccessor implements IndexAccessor
{
private final LuceneIndexWriter writer;
private LuceneSchemaIndex luceneIndex;
LuceneIndexAccessor( LuceneSchemaIndex luceneIndex ) throws IOException
{
this.luceneIndex = luceneIndex;
this.writer = luceneIndex.getIndexWriter();
}
@Override
public IndexUpdater newUpdater( IndexUpdateMode mode )
{
switch ( mode )
{
case ONLINE:
return new LuceneIndexUpdater( writer, false );
case RECOVERY:
return new LuceneIndexUpdater( writer, true );
default:
throw new IllegalArgumentException( "Unsupported update mode: " + mode );
}
}
@Override
public void drop() throws IOException
{
luceneIndex.drop();
}
@Override
public void force() throws IOException
{
luceneIndex.markAsOnline();
luceneIndex.maybeRefreshBlocking();
}
@Override
public void flush() throws IOException
{
luceneIndex.maybeRefreshBlocking();
}
@Override
public void close() throws IOException
{
luceneIndex.close();
}
@Override
public IndexReader newReader()
{
try
{
return luceneIndex.getIndexReader();
}
catch ( IOException e )
{
throw new LuceneIndexAcquisitionException("Can't acquire index reader");
}
}
@Override
public BoundedIterable<Long> newAllEntriesReader()
{
return new LuceneAllEntriesIndexAccessorReader( luceneIndex.allDocumentsReader() );
}
@Override
public ResourceIterator<File> snapshotFiles() throws IOException
{
return luceneIndex.snapshot();
}
private class LuceneIndexUpdater implements IndexUpdater
{
private final boolean isRecovery;
private final LuceneIndexWriter writer;
private LuceneIndexUpdater( LuceneIndexWriter indexWriter, boolean isRecovery )
{
this.isRecovery = isRecovery;
this.writer = indexWriter;
}
@Override
public void process( NodePropertyUpdate update ) throws IOException
{
switch ( update.getUpdateMode() )
{
case ADDED:
if ( isRecovery )
{
addRecovered( update.getNodeId(), update.getValueAfter() );
}
else
{
add( update.getNodeId(), update.getValueAfter() );
}
break;
case CHANGED:
change( update.getNodeId(), update.getValueAfter() );
break;
case REMOVED:
remove( update.getNodeId() );
break;
default:
throw new UnsupportedOperationException();
}
}
@Override
public void close() throws IOException, IndexEntryConflictException
{
luceneIndex.maybeRefreshBlocking();
}
@Override
public void remove( PrimitiveLongSet nodeIds ) throws IOException
{
nodeIds.visitKeys( nodeId -> {
remove( nodeId );
return false;
} );
}
private void addRecovered( long nodeId, Object value ) throws IOException
{
writer.updateDocument( LuceneDocumentStructure.newTermForChangeOrRemove( nodeId ),
LuceneDocumentStructure.documentRepresentingProperty( nodeId, value ) );
}
private void add( long nodeId, Object value ) throws IOException
{
writer.addDocument( LuceneDocumentStructure.documentRepresentingProperty( nodeId, value ) );
}
private void change( long nodeId, Object value ) throws IOException
{
writer.updateDocument( LuceneDocumentStructure.newTermForChangeOrRemove( nodeId ),
LuceneDocumentStructure.documentRepresentingProperty( nodeId, value ) );
}
protected void remove( long nodeId ) throws IOException
{
writer.deleteDocuments( LuceneDocumentStructure.newTermForChangeOrRemove( nodeId ) );
}
}
}