/*
* 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.jgroups;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import org.jgroups.Address;
import org.jgroups.Message;
import org.jgroups.Receiver;
import org.jgroups.View;
import org.hibernate.search.SearchException;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.indexes.spi.IndexManager;
import org.hibernate.search.spi.BuildContext;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* Listen for messages from slave nodes and apply them into <code>LuceneBackendQueueProcessor</code>
*
* @author Lukasz Moren
* @author Sanne Grinovero <sanne@hibernate.org> (C) 2011 Red Hat Inc.
* @author Ales Justin
* @see org.hibernate.search.backend.impl.lucene.LuceneBackendQueueProcessor
* @see org.hibernate.search.backend.impl.lucene.LuceneBackendQueueTask
* @see org.jgroups.Receiver
*/
public class JGroupsMasterMessageListener implements Receiver {
private static final Log log = LoggerFactory.make();
private final BuildContext context;
private final NodeSelectorStrategyHolder selector;
public JGroupsMasterMessageListener(BuildContext context, NodeSelectorStrategyHolder masterNodeSelector) {
this.context = context;
this.selector = masterNodeSelector;
}
@Override
public void receive(Message message) {
final byte[] rawBuffer = message.getRawBuffer();
final String indexName = MessageSerializationHelper.extractIndexName( rawBuffer );
final NodeSelectorStrategy nodeSelector = selector.getMasterNodeSelector( indexName );
try {
//nodeSelector can be null if we receive the message during shutdown
if ( nodeSelector != null && nodeSelector.isIndexOwnerLocal() ) {
byte[] serializedQueue = MessageSerializationHelper.extractSerializedQueue( rawBuffer );
final IndexManager indexManager = context.getAllIndexesManager().getIndexManager( indexName );
if ( indexManager != null ) {
final List<LuceneWork> queue = indexManager.getSerializer().toLuceneWorks( serializedQueue );
applyLuceneWorkLocally( queue, indexManager, message );
}
else {
log.messageReceivedForUndefinedIndex( indexName );
}
}
else {
//TODO forward to new owner or log error
}
}
catch (ClassCastException e) {
log.illegalObjectRetrievedFromMessage( e );
}
catch (SearchException e) {
log.illegalObjectRetrievedFromMessage( e );
}
}
private void applyLuceneWorkLocally(List<LuceneWork> queue, IndexManager indexManager, Message message) {
if ( queue != null && !queue.isEmpty() ) {
if ( log.isDebugEnabled() ) {
log.debugf(
"There are %d Lucene docs received from slave node %s to be processed by master",
queue.size(),
message.getSrc()
);
}
indexManager.performOperations( queue, null );
}
else {
log.receivedEmptyLuceneWorksInMessage();
}
}
// ------------------------------------------------------------------------------------------------------------------
// Implementations of JGroups interfaces
// ------------------------------------------------------------------------------------------------------------------
@Override
public void viewAccepted(View view) {
log.jGroupsReceivedNewClusterView( view );
selector.viewAccepted( view );
}
@Override
public void suspect(Address suspected_mbr) {
//no-op
}
@Override
public void block() {
//no-op
}
@Override
public void getState(OutputStream arg0) throws Exception {
}
@Override
public void setState(InputStream arg0) throws Exception {
}
@Override
public void unblock() {
}
}