/*
* Hibernate OGM, Domain model persistence for NoSQL datastores
*
* 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.ogm.massindex.batchindexing;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import org.hibernate.CacheMode;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.ogm.dialect.GridDialect;
import org.hibernate.ogm.util.impl.Log;
import org.hibernate.ogm.util.impl.LoggerFactory;
import org.hibernate.search.backend.PurgeAllLuceneWork;
import org.hibernate.search.backend.impl.batch.BatchBackend;
import org.hibernate.search.batchindexing.MassIndexerProgressMonitor;
import org.hibernate.search.engine.spi.SearchFactoryImplementor;
import org.hibernate.search.exception.ErrorHandler;
/**
* Makes sure that several different BatchIndexingWorkspace(s)
* can be started concurrently, sharing the same batch-backend
* and IndexWriters.
*
* @author Sanne Grinovero
* @author Davide D'Alto <davide@hibernate.org>
*/
public class BatchCoordinator implements Runnable {
private static final Log log = LoggerFactory.make();
private final Class<?>[] rootEntities; // entity types to reindex excluding all subtypes of each-other
private final SearchFactoryImplementor searchFactoryImplementor;
private final SessionFactoryImplementor sessionFactory;
private final int typesToIndexInParallel;
private final CacheMode cacheMode;
private final boolean optimizeAtEnd;
private final boolean purgeAtStart;
private final boolean optimizeAfterPurge;
private final CountDownLatch endAllSignal;
private final MassIndexerProgressMonitor monitor;
private final ErrorHandler errorHandler;
private final GridDialect gridDialect;
public BatchCoordinator(GridDialect gridDialect, Set<Class<?>> rootEntities, SearchFactoryImplementor searchFactoryImplementor,
SessionFactoryImplementor sessionFactory, int typesToIndexInParallel, CacheMode cacheMode, boolean optimizeAtEnd, boolean purgeAtStart,
boolean optimizeAfterPurge, MassIndexerProgressMonitor monitor) {
this.gridDialect = gridDialect;
this.rootEntities = rootEntities.toArray( new Class<?>[rootEntities.size()] );
this.searchFactoryImplementor = searchFactoryImplementor;
this.sessionFactory = sessionFactory;
this.typesToIndexInParallel = typesToIndexInParallel;
this.cacheMode = cacheMode;
this.optimizeAtEnd = optimizeAtEnd;
this.purgeAtStart = purgeAtStart;
this.optimizeAfterPurge = optimizeAfterPurge;
this.monitor = monitor;
this.endAllSignal = new CountDownLatch( rootEntities.size() );
this.errorHandler = searchFactoryImplementor.getErrorHandler();
}
@Override
public void run() {
try {
final BatchBackend backend = searchFactoryImplementor.makeBatchBackend( monitor );
try {
beforeBatch( backend ); // purgeAll and pre-optimize activities
doBatchWork( backend );
afterBatch( backend );
}
catch ( InterruptedException e ) {
log.interruptedBatchIndexing();
Thread.currentThread().interrupt();
}
finally {
monitor.indexingCompleted();
}
}
catch ( RuntimeException re ) {
// each batch processing stage is already supposed to properly handle any kind
// of exception, still since this is possibly an async operation we need a safety
// for the unexpected exceptions
errorHandler.handleException( "ERROR", re );
}
}
/**
* Will spawn a thread for each type in rootEntities, they will all re-join
* on endAllSignal when finished.
*
* @param backend
*
* @throws InterruptedException
* if interrupted while waiting for endAllSignal.
*/
private void doBatchWork(BatchBackend backend) throws InterruptedException {
ExecutorService executor = Executors.newFixedThreadPool( typesToIndexInParallel, "BatchIndexingWorkspace" );
for ( Class<?> type : rootEntities ) {
executor.execute( new BatchIndexingWorkspace( gridDialect, searchFactoryImplementor, sessionFactory, type,
cacheMode, endAllSignal, monitor, backend ) );
}
executor.shutdown();
endAllSignal.await(); // waits for the executor to finish
}
/**
* Operations to do after all subthreads finished their work on index
*
* @param backend
*/
private void afterBatch(BatchBackend backend) {
Set<Class<?>> targetedClasses = searchFactoryImplementor.getIndexedTypesPolymorphic( rootEntities );
if ( this.optimizeAtEnd ) {
backend.optimize( targetedClasses );
}
backend.flush( targetedClasses );
}
/**
* Optional operations to do before the multiple-threads start indexing
*
* @param backend
*/
private void beforeBatch(BatchBackend backend) {
if ( this.purgeAtStart ) {
// purgeAll for affected entities
Set<Class<?>> targetedClasses = searchFactoryImplementor.getIndexedTypesPolymorphic( rootEntities );
for ( Class<?> clazz : targetedClasses ) {
// needs do be in-sync work to make sure we wait for the end of it.
backend.doWorkInSync( new PurgeAllLuceneWork( clazz ) );
}
if ( this.optimizeAfterPurge ) {
backend.optimize( targetedClasses );
}
}
}
}