Package org.hibernate.search.backend.impl.jms

Source Code of org.hibernate.search.backend.impl.jms.AbstractJMSHibernateSearchController

/* $Id: AbstractJMSHibernateSearchController.java 19002 2010-03-16 01:28:07Z hardy.ferentschik $
*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009, 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.jms;

import java.util.List;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;

import org.slf4j.Logger;

import org.hibernate.Session;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.engine.SearchFactoryImplementor;
import org.hibernate.search.util.ContextHelper;
import org.hibernate.search.util.LoggerFactory;

/**
* Implement the Hibernate Search controller responsible for processing the
* work send through JMS by the slave nodes.
*
* @author Emmanuel Bernard
*/
public abstract class AbstractJMSHibernateSearchController implements MessageListener {
  private static final Logger log = LoggerFactory.make();

  /**
   * Return the current or give a new session
   * This session is not used per se, but is the link to access the Search configuration.
   * <p>
   * A typical EJB 3.0 usecase would be to get the session from the container (injected)
   * eg in JBoss EJB 3.0
   * <p>
   * <code>
   * &#64;PersistenceContext private Session session;<br>
   * <br>
   * protected Session getSession() {<br>
   *  &nbsp; &nbsp;return session<br>
   * }<br>
   * </code>
   * <p>
   * eg in any container<br>
   * <code>
   * &#64;PersistenceContext private EntityManager entityManager;<br>
   * <br>
   * protected Session getSession() {<br>
   *  &nbsp; &nbsp;return (Session) entityManager.getdelegate();<br>
   * }<br>
   * </code>
   */
  protected abstract Session getSession();

  /**
   * Ensure to clean the resources after use.
   * If the session has been directly or indirectly injected, this method is empty
   */
  protected abstract void cleanSessionIfNeeded(Session session);

  /**
   * Process the Hibernate Search work queues received
   */
  public void onMessage(Message message) {
    if ( !( message instanceof ObjectMessage ) ) {
      log.error( "Incorrect message type: {}", message.getClass() );
      return;
    }
    ObjectMessage objectMessage = (ObjectMessage) message;
    List<LuceneWork> queue;
    try {
      queue = (List<LuceneWork>) objectMessage.getObject();
    }
    catch (JMSException e) {
      log.error( "Unable to retrieve object from message: " + message.getClass(), e );
      return;
    }
    catch (ClassCastException e) {
      log.error( "Illegal object retrieved from message", e );
      return;
    }
    Runnable worker = getWorker( queue );
    worker.run();
  }

  private Runnable getWorker(List<LuceneWork> queue) {
    //FIXME casting sucks because we do not control what get session from
    Session session = getSession();
    Runnable processor = null;

    try {
      SearchFactoryImplementor factory = ContextHelper.getSearchFactory( session );
      processor = factory.getBackendQueueProcessorFactory().getProcessor( queue );
    }
    finally {
      cleanSessionIfNeeded(session);
    }
    return processor;
  }

  @PostConstruct
  public void initialize() {
    //init the source copy process
    //TODO actually this is probably wrong since this is now part of the DP
  }

  @PreDestroy
  public void shutdown() {
    //stop the source copy process
    //TODO actually this is probably wrong since this is now part of the DP
  }
}
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