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IndexReference.java
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IndexReference.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.index.impl.lucene.legacy;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.IndexSearcher;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
abstract class IndexReference
{
private final IndexIdentifier identifier;
private final IndexSearcher searcher;
private final AtomicInteger refCount = new AtomicInteger( 0 );
private boolean searcherIsClosed;
/**
* We need this because we only want to close the reader/searcher if
* it has been detached... i.e. the {@link LuceneDataSource} no longer
* has any reference to it, only an iterator out in the client has a ref.
* And when that client calls close() it should be closed.
*/
private volatile boolean detached;
public IndexReference( IndexIdentifier identifier, IndexSearcher searcher )
{
this.identifier = identifier;
this.searcher = searcher;
}
abstract IndexWriter getWriter();
abstract void dispose() throws IOException;
abstract boolean checkAndClearStale();
abstract void setStale();
public IndexSearcher getSearcher()
{
return searcher;
}
public IndexIdentifier getIdentifier()
{
return identifier;
}
void incRef()
{
this.refCount.incrementAndGet();
}
void disposeSearcher() throws IOException
{
if ( !searcherIsClosed )
{
searcher.getIndexReader().close();
searcherIsClosed = true;
}
}
void detachOrClose() throws IOException
{
if ( this.refCount.get() == 0 )
{
disposeSearcher();
}
else
{
this.detached = true;
}
}
public synchronized boolean close()
{
try
{
if ( this.searcherIsClosed || this.refCount.get() == 0 )
{
return true;
}
boolean reallyClosed = false;
if ( this.refCount.decrementAndGet() <= 0 && this.detached )
{
disposeSearcher();
reallyClosed = true;
}
return reallyClosed;
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
public boolean isClosed()
{
return searcherIsClosed;
}
boolean isDetached()
{
return detached;
}
}