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Hibernate example source code file (EventListenerRegistryImpl.java)

This example Hibernate source code file (EventListenerRegistryImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

class, defaultevicteventlistener, eventlistenergroupimpl, eventlistenergroupimpl, hashmap, load, map, map, override, override, reflection, suppresswarnings, t, t, unable, util

The Hibernate EventListenerRegistryImpl.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, Red Hat Inc. 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.event.service.internal;

import java.lang.reflect.Array;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.hibernate.HibernateException;
import org.hibernate.event.spi.EventType;
import org.hibernate.event.internal.DefaultAutoFlushEventListener;
import org.hibernate.event.internal.DefaultDeleteEventListener;
import org.hibernate.event.internal.DefaultDirtyCheckEventListener;
import org.hibernate.event.internal.DefaultEvictEventListener;
import org.hibernate.event.internal.DefaultFlushEntityEventListener;
import org.hibernate.event.internal.DefaultFlushEventListener;
import org.hibernate.event.internal.DefaultInitializeCollectionEventListener;
import org.hibernate.event.internal.DefaultLoadEventListener;
import org.hibernate.event.internal.DefaultLockEventListener;
import org.hibernate.event.internal.DefaultMergeEventListener;
import org.hibernate.event.internal.DefaultPersistEventListener;
import org.hibernate.event.internal.DefaultPersistOnFlushEventListener;
import org.hibernate.event.internal.DefaultPostLoadEventListener;
import org.hibernate.event.internal.DefaultPreLoadEventListener;
import org.hibernate.event.internal.DefaultRefreshEventListener;
import org.hibernate.event.internal.DefaultReplicateEventListener;
import org.hibernate.event.internal.DefaultSaveEventListener;
import org.hibernate.event.internal.DefaultSaveOrUpdateEventListener;
import org.hibernate.event.internal.DefaultUpdateEventListener;
import org.hibernate.event.service.spi.DuplicationStrategy;
import org.hibernate.event.service.spi.EventListenerRegistrationException;
import org.hibernate.event.service.spi.EventListenerRegistry;

import static org.hibernate.event.spi.EventType.AUTO_FLUSH;
import static org.hibernate.event.spi.EventType.DELETE;
import static org.hibernate.event.spi.EventType.DIRTY_CHECK;
import static org.hibernate.event.spi.EventType.EVICT;
import static org.hibernate.event.spi.EventType.FLUSH;
import static org.hibernate.event.spi.EventType.FLUSH_ENTITY;
import static org.hibernate.event.spi.EventType.INIT_COLLECTION;
import static org.hibernate.event.spi.EventType.LOAD;
import static org.hibernate.event.spi.EventType.LOCK;
import static org.hibernate.event.spi.EventType.MERGE;
import static org.hibernate.event.spi.EventType.PERSIST;
import static org.hibernate.event.spi.EventType.PERSIST_ONFLUSH;
import static org.hibernate.event.spi.EventType.POST_COLLECTION_RECREATE;
import static org.hibernate.event.spi.EventType.POST_COLLECTION_REMOVE;
import static org.hibernate.event.spi.EventType.POST_COLLECTION_UPDATE;
import static org.hibernate.event.spi.EventType.POST_COMMIT_DELETE;
import static org.hibernate.event.spi.EventType.POST_COMMIT_INSERT;
import static org.hibernate.event.spi.EventType.POST_COMMIT_UPDATE;
import static org.hibernate.event.spi.EventType.POST_DELETE;
import static org.hibernate.event.spi.EventType.POST_INSERT;
import static org.hibernate.event.spi.EventType.POST_LOAD;
import static org.hibernate.event.spi.EventType.POST_UPDATE;
import static org.hibernate.event.spi.EventType.PRE_COLLECTION_RECREATE;
import static org.hibernate.event.spi.EventType.PRE_COLLECTION_REMOVE;
import static org.hibernate.event.spi.EventType.PRE_COLLECTION_UPDATE;
import static org.hibernate.event.spi.EventType.PRE_DELETE;
import static org.hibernate.event.spi.EventType.PRE_INSERT;
import static org.hibernate.event.spi.EventType.PRE_LOAD;
import static org.hibernate.event.spi.EventType.PRE_UPDATE;
import static org.hibernate.event.spi.EventType.REFRESH;
import static org.hibernate.event.spi.EventType.REPLICATE;
import static org.hibernate.event.spi.EventType.SAVE;
import static org.hibernate.event.spi.EventType.SAVE_UPDATE;
import static org.hibernate.event.spi.EventType.UPDATE;

/**
 * @author Steve Ebersole
 */
public class EventListenerRegistryImpl implements EventListenerRegistry {
	private Map<Class,Object> listenerClassToInstanceMap = new HashMap();

	private Map<EventType,EventListenerGroupImpl> registeredEventListenersMap = prepareListenerMap();

	@SuppressWarnings({ "unchecked" })
	public <T> EventListenerGroupImpl getEventListenerGroup(EventType eventType) {
		EventListenerGroupImpl<T> listeners = registeredEventListenersMap.get( eventType );
		if ( listeners == null ) {
			throw new HibernateException( "Unable to find listeners for type [" + eventType.eventName() + "]" );
		}
		return listeners;
	}

	@Override
	public void addDuplicationStrategy(DuplicationStrategy strategy) {
		for ( EventListenerGroupImpl group : registeredEventListenersMap.values() ) {
			group.addDuplicationStrategy( strategy );
		}
	}

	@Override
	public <T> void setListeners(EventType type, Class... listenerClasses) {
		setListeners( type, resolveListenerInstances( type, listenerClasses ) );
	}

	@SuppressWarnings( {"unchecked"})
	private <T> T[] resolveListenerInstances(EventType type, Class... listenerClasses) {
		T[] listeners = (T[]) Array.newInstance( type.baseListenerInterface(), listenerClasses.length );
		for ( int i = 0; i < listenerClasses.length; i++ ) {
			listeners[i] = resolveListenerInstance( listenerClasses[i] );
		}
		return listeners;
	}

	@SuppressWarnings( {"unchecked"})
	private <T> T resolveListenerInstance(Class listenerClass) {
		T listenerInstance = (T) listenerClassToInstanceMap.get( listenerClass );
		if ( listenerInstance == null ) {
			listenerInstance = instantiateListener( listenerClass );
			listenerClassToInstanceMap.put( listenerClass, listenerInstance );
		}
		return listenerInstance;
	}

	private <T> T instantiateListener(Class listenerClass) {
		try {
			return listenerClass.newInstance();
		}
		catch ( Exception e ) {
			throw new EventListenerRegistrationException(
					"Unable to instantiate specified event listener class: " + listenerClass.getName(),
					e
			);
		}
	}

	@Override
	public <T> void setListeners(EventType type, T... listeners) {
		EventListenerGroupImpl<T> registeredListeners = getEventListenerGroup( type );
		registeredListeners.clear();
		if ( listeners != null ) {
			for ( int i = 0, max = listeners.length; i < max; i++ ) {
				registeredListeners.appendListener( listeners[i] );
			}
		}
	}

	@Override
	public <T> void appendListeners(EventType type, Class... listenerClasses) {
		appendListeners( type, resolveListenerInstances( type, listenerClasses ) );
	}

	@Override
	public <T> void appendListeners(EventType type, T... listeners) {
		getEventListenerGroup( type ).appendListeners( listeners );
	}

	@Override
	public <T> void prependListeners(EventType type, Class... listenerClasses) {
		prependListeners( type, resolveListenerInstances( type, listenerClasses ) );
	}

	@Override
	public <T> void prependListeners(EventType type, T... listeners) {
		getEventListenerGroup( type ).prependListeners( listeners );
	}

	private static Map<EventType,EventListenerGroupImpl> prepareListenerMap() {
		final Map<EventType,EventListenerGroupImpl> workMap = new HashMap();

		// auto-flush listeners
		prepareListeners(
				AUTO_FLUSH,
				new DefaultAutoFlushEventListener(),
				workMap
		);

		// create listeners
		prepareListeners(
				PERSIST,
				new DefaultPersistEventListener(),
				workMap
		);

		// create-onflush listeners
		prepareListeners(
				PERSIST_ONFLUSH,
				new DefaultPersistOnFlushEventListener(),
				workMap
		);

		// delete listeners
		prepareListeners(
				DELETE,
				new DefaultDeleteEventListener(),
				workMap
		);

		// dirty-check listeners
		prepareListeners(
				DIRTY_CHECK,
				new DefaultDirtyCheckEventListener(),
				workMap
		);

		// evict listeners
		prepareListeners(
				EVICT,
				new DefaultEvictEventListener(),
				workMap
		);

		// flush listeners
		prepareListeners(
				FLUSH,
				new DefaultFlushEventListener(),
				workMap
		);

		// flush-entity listeners
		prepareListeners(
				FLUSH_ENTITY,
				new DefaultFlushEntityEventListener(),
				workMap
		);

		// load listeners
		prepareListeners(
				LOAD,
				new DefaultLoadEventListener(),
				workMap
		);

		// load-collection listeners
		prepareListeners(
				INIT_COLLECTION,
				new DefaultInitializeCollectionEventListener(),
				workMap
		);

		// lock listeners
		prepareListeners(
				LOCK,
				new DefaultLockEventListener(),
				workMap
		);

		// merge listeners
		prepareListeners(
				MERGE,
				new DefaultMergeEventListener(),
				workMap
		);

		// pre-collection-recreate listeners
		prepareListeners(
				PRE_COLLECTION_RECREATE,
				workMap
		);

		// pre-collection-remove listeners
		prepareListeners(
				PRE_COLLECTION_REMOVE,
				workMap
		);

		// pre-collection-update listeners
		prepareListeners(
				PRE_COLLECTION_UPDATE,
				workMap
		);

		// pre-delete listeners
		prepareListeners(
				PRE_DELETE,
				workMap
		);

		// pre-insert listeners
		prepareListeners(
				PRE_INSERT,
				workMap
		);

		// pre-load listeners
		prepareListeners(
				PRE_LOAD,
				new DefaultPreLoadEventListener(),
				workMap
		);

		// pre-update listeners
		prepareListeners(
				PRE_UPDATE,
				workMap
		);

		// post-collection-recreate listeners
		prepareListeners(
				POST_COLLECTION_RECREATE,
				workMap
		);

		// post-collection-remove listeners
		prepareListeners(
				POST_COLLECTION_REMOVE,
				workMap
		);

		// post-collection-update listeners
		prepareListeners(
				POST_COLLECTION_UPDATE,
				workMap
		);

		// post-commit-delete listeners
		prepareListeners(
				POST_COMMIT_DELETE,
				workMap
		);

		// post-commit-insert listeners
		prepareListeners(
				POST_COMMIT_INSERT,
				workMap
		);

		// post-commit-update listeners
		prepareListeners(
				POST_COMMIT_UPDATE,
				workMap
		);

		// post-delete listeners
		prepareListeners(
				POST_DELETE,
				workMap
		);

		// post-insert listeners
		prepareListeners(
				POST_INSERT,
				workMap
		);

		// post-load listeners
		prepareListeners(
				POST_LOAD,
				new DefaultPostLoadEventListener(),
				workMap
		);

		// post-update listeners
		prepareListeners(
				POST_UPDATE,
				workMap
		);

		// update listeners
		prepareListeners(
				UPDATE,
				new DefaultUpdateEventListener(),
				workMap
		);

		// refresh listeners
		prepareListeners(
				REFRESH,
				new DefaultRefreshEventListener(),
				workMap
		);

		// replicate listeners
		prepareListeners(
				REPLICATE,
				new DefaultReplicateEventListener(),
				workMap
		);

		// save listeners
		prepareListeners(
				SAVE,
				new DefaultSaveEventListener(),
				workMap
		);

		// save-update listeners
		prepareListeners(
				SAVE_UPDATE,
				new DefaultSaveOrUpdateEventListener(),
				workMap
		);

		return Collections.unmodifiableMap( workMap );
	}

	private static <T> void prepareListeners(EventType type, Map map) {
		prepareListeners( type, null, map );
	}

	private static <T> void prepareListeners(EventType type, T defaultListener, Map map) {
		final EventListenerGroupImpl<T> listeners = new EventListenerGroupImpl( type );
		if ( defaultListener != null ) {
			listeners.appendListener( defaultListener );
		}
		map.put( type, listeners  );
	}

}

Other Hibernate examples (source code examples)

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