/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat, Inc. and/or its affiliates or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat, Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
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.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 errorhandler.
*
* @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(Throwable t) {
try {
super.handleMergeException( 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)
*/
protected synchronized MergeThread getMergeThread(IndexWriter writer, MergePolicy.OneMerge merge) throws IOException {
final MergeThread thread = new MergeThread( writer, merge );
thread.setThreadPriority( getMergeThreadPriority() );
thread.setDaemon( true );
thread.setName( "Lucene Merge Thread #" + mergeThreadCount++ + " for index " + indexName );
return thread;
}
}