package org.neo4j.index.lucene;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.lucene.search.IndexSearcher;
class IndexSearcherRef
{
private final String key;
private final IndexSearcher searcher;
private final AtomicInteger refCount = new AtomicInteger( 0 );
private boolean isClosed;
/**
* 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 boolean detached;
public IndexSearcherRef( String key, IndexSearcher searcher )
{
this.key = key;
this.searcher = searcher;
}
IndexSearcher getSearcher()
{
return this.searcher;
}
String getKey()
{
return this.key;
}
void incRef()
{
this.refCount.incrementAndGet();
}
void dispose() throws IOException
{
if ( !this.isClosed )
{
this.searcher.close();
this.searcher.getIndexReader().close();
this.isClosed = true;
}
}
void detachOrClose() throws IOException
{
if ( this.refCount.get() == 0 )
{
dispose();
}
else
{
this.detached = true;
}
}
boolean close() throws IOException
{
if ( this.isClosed || this.refCount.get() == 0 )
{
return true;
}
boolean reallyClosed = false;
if ( this.refCount.decrementAndGet() <= 0 && this.detached )
{
dispose();
reallyClosed = true;
}
return reallyClosed;
}
boolean closeStrict()
{
try
{
return close();
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
}