/*
* 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;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.locks.Lock;
import org.apache.lucene.index.IndexWriter;
import org.hibernate.search.backend.IndexingMonitor;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.util.logging.impl.LoggerFactory;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.exception.impl.ErrorContextBuilder;
/**
* Apply the operations to Lucene directories.
*
* @author Emmanuel Bernard
* @author Hardy Ferentschik
* @author John Griffin
* @author Sanne Grinovero
*/
final class LuceneBackendQueueTask implements Runnable {
private static final Log log = LoggerFactory.make();
private final Lock modificationLock;
private final LuceneBackendResources resources;
private final List<LuceneWork> queue;
private final IndexingMonitor monitor;
LuceneBackendQueueTask(List<LuceneWork> queue, LuceneBackendResources resources, IndexingMonitor monitor) {
this.queue = queue;
this.resources = resources;
this.monitor = monitor;
this.modificationLock = resources.getParallelModificationLock();
}
public void run() {
modificationLock.lock();
try {
applyUpdates();
} catch ( InterruptedException e ) {
Thread.currentThread().interrupt();
log.interruptedWhileWaitingForIndexActivity();
handleException( e );
} catch ( Exception e ) {
log.backendError( e );
handleException( e );
}
finally {
modificationLock.unlock();
}
}
private void handleException(Exception e) {
ErrorContextBuilder builder = new ErrorContextBuilder();
builder.allWorkToBeDone( queue );
builder.errorThatOccurred( e );
resources.getErrorHandler().handle( builder.createErrorContext() );
}
/**
* Applies all modifications to the index in parallel using the workers executor
* @throws ExecutionException
* @throws InterruptedException
*/
private void applyUpdates() throws InterruptedException, ExecutionException {
AbstractWorkspaceImpl workspace = resources.getWorkspace();
ErrorContextBuilder errorContextBuilder = new ErrorContextBuilder();
errorContextBuilder.allWorkToBeDone( queue );
IndexWriter indexWriter = workspace.getIndexWriter( errorContextBuilder );
if ( indexWriter == null ) {
log.cannotOpenIndexWriterCausePreviousError();
return;
}
LinkedList<LuceneWork> failedUpdates = null;
try {
ExecutorService executor = resources.getWorkersExecutor();
int queueSize = queue.size();
Future[] submittedTasks = new Future[ queueSize ];
for ( int i = 0; i < queueSize; i++ ) {
SingleTaskRunnable task = new SingleTaskRunnable( queue.get( i ), resources, indexWriter, monitor );
submittedTasks[i] = executor.submit( task );
}
// now wait for all tasks being completed before releasing our lock
// (this thread waits even in async backend mode)
for ( int i = 0; i < queueSize; i++ ) {
Future task = submittedTasks[i];
try {
task.get();
errorContextBuilder.workCompleted( queue.get( i ) );
}
catch (ExecutionException e) {
if ( failedUpdates == null ) {
failedUpdates = new LinkedList<LuceneWork>();
}
failedUpdates.add( queue.get( i ) );
errorContextBuilder.errorThatOccurred( e.getCause() );
}
}
if ( failedUpdates != null ) {
errorContextBuilder.addAllWorkThatFailed( failedUpdates );
resources.getErrorHandler().handle( errorContextBuilder.createErrorContext() );
}
else {
workspace.optimizerPhase();
}
}
finally {
workspace.afterTransactionApplied( failedUpdates != null, false );
}
}
}