/*
* 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.blackhole;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.hibernate.search.spi.WorkerBuildContext;
import org.hibernate.search.backend.IndexingMonitor;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.backend.spi.BackendQueueProcessor;
import org.hibernate.search.indexes.impl.DirectoryBasedIndexManager;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* This backend does not do anything: the Documents are not
* sent to any index but are discarded.
* Useful to identify the bottleneck in indexing performance problems,
* fully disabling the backend system but still building the Documents
* needed to update an index (loading data from DB).
*
* @author Sanne Grinovero
*/
public class BlackHoleBackendQueueProcessor implements BackendQueueProcessor {
private static final Log log = LoggerFactory.make();
private final ReentrantLock backendLock = new ReentrantLock();
@Override
public void initialize(Properties props, WorkerBuildContext context, DirectoryBasedIndexManager indexManager) {
// no-op
log.initializedBlackholeBackend();
}
@Override
public void close() {
// no-op
log.closedBlackholeBackend();
}
@Override
public void applyWork(List<LuceneWork> workList, IndexingMonitor monitor) {
// no-op
log.debug( "Discarding a list of LuceneWork" );
}
@Override
public void applyStreamWork(LuceneWork singleOperation, IndexingMonitor monitor) {
// no-op
log.debug( "Discarding a single LuceneWork" );
}
@Override
public Lock getExclusiveWriteLock() {
return backendLock;
}
@Override
public void indexMappingChanged() {
// no-op
log.debug( "BlackHoleBackend reconfigured" );
}
}