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IndexTypeCache.java
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IndexTypeCache.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.index.lucene.legacy;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.neo4j.helpers.Pair;
import org.neo4j.kernel.impl.index.IndexConfigStore;
class IndexTypeCache
{
private final Map<IndexIdentifier, Pair<Integer, IndexType>> cache = Collections.synchronizedMap(
new HashMap<IndexIdentifier, Pair<Integer, IndexType>>() );
private final IndexConfigStore indexStore;
IndexTypeCache( IndexConfigStore indexStore )
{
this.indexStore = indexStore;
}
IndexType getIndexType( IndexIdentifier identifier, boolean recovery )
{
Pair<Integer, IndexType> type = cache.get( identifier );
Map<String, String> config = indexStore.get( identifier.entityType.entityClass(), identifier.indexName );
if ( type != null && config.hashCode() == type.first() )
{
return type.other();
}
if ( config == null )
{
if ( recovery )
{
return null;
}
throw new IllegalStateException( "Unknown index " + identifier );
}
type = Pair.of( config.hashCode(), IndexType.getIndexType( config ) );
cache.put( identifier, type );
return type.other();
}
void invalidate( IndexIdentifier identifier )
{
cache.remove( identifier );
}
}