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FulltextProvider.java
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FulltextProvider.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 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.kernel.api.impl.fulltext;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.neo4j.graphdb.GraphDatabaseService;
public class FulltextProvider implements AutoCloseable
{
private static FulltextProvider instance;
private final GraphDatabaseService db;
private final FulltextTransactionEventUpdater fulltextTransactionEventUpdater;
private boolean closed;
private Set<String> nodeProperties;
private Set<String> relationshipProperties;
private Map<String,LuceneFulltext> nodeIndices;
private Map<String,LuceneFulltext> relationshipIndices;
private FulltextProvider( GraphDatabaseService db )
{
this.db = db;
closed = false;
fulltextTransactionEventUpdater = new FulltextTransactionEventUpdater( this );
db.registerTransactionEventHandler( fulltextTransactionEventUpdater );
nodeProperties = new HashSet<>();
relationshipProperties = new HashSet<>();
nodeIndices = new HashMap<>();
relationshipIndices = new HashMap<>();
}
public static synchronized FulltextProvider instance( GraphDatabaseService db )
{
if ( instance == null || instance.closed )
{
instance = new FulltextProvider( db );
}
return instance;
}
@Override
public synchronized void close()
{
if ( !closed )
{
closed = true;
db.unregisterTransactionEventHandler( fulltextTransactionEventUpdater );
nodeIndices.values().forEach( luceneFulltextHelper ->
{
try
{
luceneFulltextHelper.close();
}
catch ( IOException e )
{
e.printStackTrace();
}
} );
relationshipIndices.values().forEach( luceneFulltextHelper ->
{
try
{
luceneFulltextHelper.close();
}
catch ( IOException e )
{
e.printStackTrace();
}
} );
}
}
synchronized void register( LuceneFulltext fulltextHelper ) throws IOException
{
fulltextHelper.open();
if ( fulltextHelper.getType() == FULLTEXT_HELPER_TYPE.NODES )
{
nodeIndices.put( fulltextHelper.getIdentifier(), fulltextHelper );
nodeProperties.addAll( fulltextHelper.getProperties() );
}
else
{
relationshipIndices.put( fulltextHelper.getIdentifier(), fulltextHelper );
relationshipProperties.addAll( fulltextHelper.getProperties() );
}
}
String[] getNodeProperties()
{
return nodeProperties.toArray( new String[0] );
}
String[] getRelationshipProperties()
{
return relationshipProperties.toArray( new String[0] );
}
Set<WritableFulltext> writableNodeIndices()
{
return nodeIndices.values().stream().map( WritableFulltext::new ).collect( Collectors.toSet() );
}
Set<WritableFulltext> writableRelationshipIndices()
{
return relationshipIndices.values().stream().map( WritableFulltext::new ).collect( Collectors.toSet() );
}
public ReadOnlyFulltext getReader( String identifier, FULLTEXT_HELPER_TYPE type ) throws IOException
{
if ( type == FULLTEXT_HELPER_TYPE.NODES )
{
return nodeIndices.get( identifier ).getIndexReader();
}
else
{
return relationshipIndices.get( identifier ).getIndexReader();
}
}
public enum FULLTEXT_HELPER_TYPE
{
NODES
{
@Override
public String toString()
{
return "Nodes";
}
},
RELATIONSHIPS
{
@Override
public String toString()
{
return "Relationships";
}
}
}
}