/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* 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,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package org.hibernate.search.indexes.impl;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.lucene.search.Similarity;
import org.hibernate.annotations.common.reflection.ReflectionManager;
import org.hibernate.annotations.common.reflection.XClass;
import org.hibernate.annotations.common.reflection.java.JavaReflectionManager;
import org.hibernate.annotations.common.util.StringHelper;
import org.hibernate.search.Environment;
import org.hibernate.search.SearchException;
import org.hibernate.search.annotations.Indexed;
import org.hibernate.search.cfg.spi.SearchConfiguration;
import org.hibernate.search.engine.impl.MutableEntityIndexBinding;
import org.hibernate.search.indexes.spi.IndexManager;
import org.hibernate.search.indexes.interceptor.DefaultEntityInterceptor;
import org.hibernate.search.indexes.interceptor.EntityIndexingInterceptor;
import org.hibernate.search.spi.WorkerBuildContext;
import org.hibernate.search.spi.internals.SearchFactoryImplementorWithShareableState;
import org.hibernate.search.store.IndexShardingStrategy;
import org.hibernate.search.store.impl.DirectoryProviderFactory;
import org.hibernate.search.store.impl.IdHashShardingStrategy;
import org.hibernate.search.store.impl.NotShardedStrategy;
import org.hibernate.search.util.configuration.impl.ConfigurationParseHelper;
import org.hibernate.search.util.configuration.impl.MaskedProperty;
import org.hibernate.search.util.impl.ClassLoaderHelper;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* Stores references to IndexManager instances, and starts/stops them.
* Starting IndexManagers happens by creating new EntityIndexBinder instances, while creating the binders
* if we hit the need for a new IndexManager, or several according to a sharding strategy, the new
* IndexManagers are started incrementally.
* Stopping IndexManager can not currently happen decrementally: to stop the IndexManagers all of them
* are stopped.
*
* @author Emmanuel Bernard
* @author Sylvain Vieujot
* @author Hardy Ferentschik
* @author Sanne Grinovero
*/
public class IndexManagerHolder {
private static final Log log = LoggerFactory.make();
private static final String SHARDING_STRATEGY = "sharding_strategy";
private static final String NBR_OF_SHARDS = SHARDING_STRATEGY + ".nbr_of_shards";
private final Map<String, IndexManager> indexManagersRegistry= new ConcurrentHashMap<String, IndexManager>();
//I currently think it's easier to not hide sharding implementations in a custom
//IndexManager to make it easier to explicitly a)detect duplicates b)start-stop
//additional Managers as needed from a dynamic sharding implementation, without having
//to embed the sharding logic in a manager itself.
//so now we have a real 1:1 relation between Managers and indexes, and the signature for
//#getReader() will always return a single "naive" IndexReader.
//So we get better caching too, as the changed indexes change cache keys on a fine-grained basis
//(for both fieldCaches and cached filters)
public synchronized MutableEntityIndexBinding buildEntityIndexBinding(
XClass entity,
Class mappedClass,
SearchConfiguration cfg,
WorkerBuildContext context
) {
// read the properties
String directoryProviderName = getDirectoryProviderName( entity, cfg );
Properties[] indexProps = getDirectoryProperties( cfg, directoryProviderName );
//set up the IndexManagers
int nbrOfProviders = indexProps.length;
IndexManager[] providers = new IndexManager[nbrOfProviders];
for ( int index = 0; index < nbrOfProviders; index++ ) {
String providerName = nbrOfProviders > 1 ?
directoryProviderName + "." + index :
directoryProviderName;
IndexManager indexManager = indexManagersRegistry.get( providerName );
if ( indexManager == null ) {
indexManager = createIndexManager( providerName, indexProps[index], context, cfg );
indexManagersRegistry.put( providerName, indexManager );
}
indexManager.addContainedEntity( mappedClass );
providers[index] = indexManager;
}
//define sharding strategy for this entity:
IndexShardingStrategy shardingStrategy;
//any indexProperty will do, the indexProps[0] surely exists.
String shardingStrategyName = indexProps[0].getProperty( SHARDING_STRATEGY );
if ( shardingStrategyName == null ) {
if ( indexProps.length == 1 ) {
shardingStrategy = new NotShardedStrategy();
}
else {
shardingStrategy = new IdHashShardingStrategy();
}
}
else {
shardingStrategy = ClassLoaderHelper.instanceFromName(
IndexShardingStrategy.class,
shardingStrategyName, DirectoryProviderFactory.class, "IndexShardingStrategy"
);
}
shardingStrategy.initialize(
new MaskedProperty( indexProps[0], SHARDING_STRATEGY ), providers
);
//define the Similarity implementation:
// warning: it can also be set by an annotation at class level
final String similarityClassName = indexProps[0].getProperty( Environment.SIMILARITY_CLASS_PER_INDEX );
Similarity similarityInstance = null;
if ( similarityClassName != null ) {
similarityInstance = ClassLoaderHelper.instanceFromName(
Similarity.class,
similarityClassName,
DirectoryProviderFactory.class,
"Similarity class for index " + directoryProviderName
);
for ( IndexManager manager : providers ) {
setSimilarity( similarityInstance, manager );
}
}
Indexed indexedAnnotation = entity.getAnnotation( Indexed.class );
EntityIndexingInterceptor<?> interceptor = null;
if (indexedAnnotation != null) {
Class<? extends EntityIndexingInterceptor> interceptorClass = getInterceptorClassFromHierarchy(
entity,
indexedAnnotation
);
if (interceptorClass == DefaultEntityInterceptor.class) {
interceptor = null;
}
else {
interceptor = ClassLoaderHelper.instanceFromClass(
EntityIndexingInterceptor.class,
interceptorClass,
"IndexingActionInterceptor for " + entity.getName()
);
}
}
return buildTypesafeMutableEntityBinder(
entity.getClass(),
providers,
shardingStrategy,
similarityInstance,
interceptor
);
}
private Class<? extends EntityIndexingInterceptor> getInterceptorClassFromHierarchy(XClass entity, Indexed indexedAnnotation) {
Class<? extends EntityIndexingInterceptor> result = indexedAnnotation.interceptor();
XClass superEntity = entity;
while ( result == DefaultEntityInterceptor.class ) {
superEntity = superEntity.getSuperclass();
//Object.class
if (superEntity == null) {
return result;
}
Indexed indexAnnForSuperclass = superEntity.getAnnotation( Indexed.class );
result = indexAnnForSuperclass != null ?
indexAnnForSuperclass.interceptor() :
result;
}
return result;
}
@SuppressWarnings( "unchecked" )
private <T,U> MutableEntityIndexBinding<T> buildTypesafeMutableEntityBinder(Class<T> type, IndexManager[] providers,
IndexShardingStrategy shardingStrategy,
Similarity similarityInstance,
EntityIndexingInterceptor<U> interceptor) {
EntityIndexingInterceptor<? super T> safeInterceptor = (EntityIndexingInterceptor<? super T> ) interceptor;
return new MutableEntityIndexBinding<T>( shardingStrategy, similarityInstance, providers, safeInterceptor );
}
/**
* Specifies a custom similarity on an index
* @param newSimilarity
* @param manager
*/
private void setSimilarity(Similarity newSimilarity, IndexManager manager) {
Similarity similarity = manager.getSimilarity();
if ( similarity != null && ! similarity.getClass().equals( newSimilarity.getClass() ) ) {
throw new SearchException(
"Multiple entities are sharing the same index but are declaring an " +
"inconsistent Similarity. When overriding default Similarity make sure that all types sharing a same index " +
"declare the same Similarity implementation."
);
}
manager.setSimilarity( newSimilarity );
}
private IndexManager createIndexManager(String indexName, Properties indexProps, WorkerBuildContext context, SearchConfiguration cfg) {
String indexManagerImplementationName = indexProps.getProperty( Environment.INDEX_MANAGER_IMPL_NAME );
final IndexManager manager;
if ( StringHelper.isEmpty( indexManagerImplementationName ) ) {
manager = cfg.getIndexManagerFactory().createDefaultIndexManager();
}
else {
manager = cfg.getIndexManagerFactory().createIndexManagerByName( indexManagerImplementationName );
}
try {
manager.initialize( indexName, indexProps, context );
return manager;
} catch (Exception e) {
throw log.unableToInitializeIndexManager( indexName, e );
}
}
/**
* Extracts the index name used for the entity from it's annotations
* @return the index name
*/
private static String getDirectoryProviderName(XClass clazz, SearchConfiguration cfg) {
ReflectionManager reflectionManager = cfg.getReflectionManager();
if ( reflectionManager == null ) {
reflectionManager = new JavaReflectionManager();
}
//get the most specialized (ie subclass > superclass) non default index name
//if none extract the name from the most generic (superclass > subclass) @Indexed class in the hierarchy
//FIXME I'm inclined to get rid of the default value
Class<?> aClass = cfg.getClassMapping( clazz.getName() );
XClass rootIndex = null;
do {
XClass currentClazz = reflectionManager.toXClass( aClass );
Indexed indexAnn = currentClazz.getAnnotation( Indexed.class );
if ( indexAnn != null ) {
if ( indexAnn.index().length() != 0 ) {
return indexAnn.index();
}
else {
rootIndex = currentClazz;
}
}
aClass = aClass.getSuperclass();
}
while ( aClass != null );
//there is nobody out there with a non default @Indexed.index
if ( rootIndex != null ) {
return rootIndex.getName();
}
else {
throw new SearchException(
"Trying to extract the index name from a non @Indexed class: " + clazz.getName()
);
}
}
/**
* Returns an array of directory properties
* Properties are defaulted. For a given property name,
* hibernate.search.indexname.n has priority over hibernate.search.indexname which has priority over hibernate.search.default
* If the Index is not sharded, a single Properties is returned
* If the index is sharded, the Properties index matches the shard index
*/
private static Properties[] getDirectoryProperties(SearchConfiguration cfg, String directoryProviderName) {
Properties rootCfg = new MaskedProperty( cfg.getProperties(), "hibernate.search" );
Properties globalProperties = new MaskedProperty( rootCfg, "default" );
Properties directoryLocalProperties = new MaskedProperty( rootCfg, directoryProviderName, globalProperties );
final String shardsCountValue = directoryLocalProperties.getProperty( NBR_OF_SHARDS );
if ( shardsCountValue == null ) {
// no shards: finished.
return new Properties[] { directoryLocalProperties };
}
else {
// count shards
int shardsCount = ConfigurationParseHelper.parseInt(
shardsCountValue, shardsCountValue + " is not a number"
);
// create shard-specific Props
Properties[] shardLocalProperties = new Properties[shardsCount];
for ( int i = 0; i < shardsCount; i++ ) {
shardLocalProperties[i] = new MaskedProperty(
directoryLocalProperties, Integer.toString( i ), directoryLocalProperties
);
}
return shardLocalProperties;
}
}
/**
* @return all IndexManager instances
*/
public Collection<IndexManager> getIndexManagers() {
return indexManagersRegistry.values();
}
/**
* Useful for MutableSearchFactory, this haves all managed IndexManagers
* switch over to the new SearchFactory.
* @param factory the new SearchFactory to set on each IndexManager.
*/
public void setActiveSearchFactory(SearchFactoryImplementorWithShareableState factory) {
for ( IndexManager indexManager : getIndexManagers() ) {
indexManager.setSearchFactory( factory );
}
}
/**
* Stops all IndexManager instances
*/
public synchronized void stop() {
for ( IndexManager indexManager : getIndexManagers() ) {
indexManager.destroy();
}
indexManagersRegistry.clear();
}
/**
* @param targetIndexName the name of the IndexManager to look up
* @return the IndexManager, or null if it doesn't exist
*/
public IndexManager getIndexManager(String targetIndexName) {
if(targetIndexName == null) {
throw log.nullIsInvalidIndexName();
}
return indexManagersRegistry.get( targetIndexName );
}
}