/*
* Hibernate Search, full-text search for your domain model
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.search.backend.impl.lucene.overrides;
import java.io.IOException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.MergePolicy;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.ThreadInterruptedException;
import org.hibernate.search.exception.ErrorHandler;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* We customize Lucene's ConcurrentMergeScheduler to route eventual exceptions to our configurable error handler.
*
* @see ErrorHandler
* @since 3.3
* @author Sanne Grinovero
*/
//TODO think about using an Executor instead of starting Threads directly
public class ConcurrentMergeScheduler extends org.apache.lucene.index.ConcurrentMergeScheduler {
private static final Log log = LoggerFactory.make();
private final ErrorHandler errorHandler;
private final String indexName;
public ConcurrentMergeScheduler(ErrorHandler errorHandler, String indexName) {
this.errorHandler = errorHandler;
this.indexName = indexName;
}
@Override
protected void handleMergeException(Directory dir, Throwable t) {
try {
super.handleMergeException( dir, t );
}
catch (ThreadInterruptedException ie) {
Thread.currentThread().interrupt();
}
catch (Exception ex) {
errorHandler.handleException( log.exceptionDuringIndexMergeOperation() , ex );
}
}
/*
* Overrides method to customize the thread Name
* @see org.apache.lucene.index.ConcurrentMergeScheduler#getMergeThread(org.apache.lucene.index.IndexWriter, org.apache.lucene.index.MergePolicy.OneMerge)
*/
@Override
protected synchronized MergeThread getMergeThread(IndexWriter writer, MergePolicy.OneMerge merge) throws IOException {
final MergeThread thread = new MergeThread( writer, merge );
thread.setDaemon( true );
thread.setName( "Lucene Merge Thread #" + mergeThreadCount++ + " for index " + indexName );
return thread;
}
}