/*
 * 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.cache.ehcache;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;

import net.sf.ehcache.CacheManager;
import net.sf.ehcache.config.Configuration;
import net.sf.ehcache.config.ConfigurationFactory;
import org.jboss.logging.Logger;

import org.hibernate.cache.CacheException;
import org.hibernate.cache.ehcache.internal.util.HibernateUtil;
import org.hibernate.cfg.Settings;

/**
 * A non-singleton EhCacheRegionFactory implementation.
 *
 * @author Chris Dennis
 * @author Greg Luck
 * @author Emmanuel Bernard
 * @author Abhishek Sanoujam
 * @author Alex Snaps
 */
public class EhCacheRegionFactory extends AbstractEhcacheRegionFactory {

    private static final EhCacheMessageLogger LOG = Logger.getMessageLogger(
            EhCacheMessageLogger.class,
            EhCacheRegionFactory.class.getName()
    );


    public EhCacheRegionFactory() {
    }

    /**
     * Creates a non-singleton EhCacheRegionFactory
     */
    public EhCacheRegionFactory(Properties prop) {
        super();
    }

    /**
     * {@inheritDoc}
     */
    public void start(Settings settings, Properties properties) throws CacheException {
        this.settings = settings;
        if ( manager != null ) {
            LOG.attemptToRestartAlreadyStartedEhCacheProvider();
            return;
        }

        try {
            String configurationResourceName = null;
            if ( properties != null ) {
                configurationResourceName = (String) properties.get( NET_SF_EHCACHE_CONFIGURATION_RESOURCE_NAME );
            }
            if ( configurationResourceName == null || configurationResourceName.length() == 0 ) {
                Configuration configuration = ConfigurationFactory.parseConfiguration();
                manager = new CacheManager( configuration );
            }
            else {
                URL url;
                try {
                    url = new URL( configurationResourceName );
                }
                catch ( MalformedURLException e ) {
                    url = loadResource( configurationResourceName );
                }
                Configuration configuration = HibernateUtil.loadAndCorrectConfiguration( url );
                manager = new CacheManager( configuration );
            }
            mbeanRegistrationHelper.registerMBean( manager, properties );
        }
        catch ( net.sf.ehcache.CacheException e ) {
            if ( e.getMessage().startsWith(
                    "Cannot parseConfiguration CacheManager. Attempt to create a new instance of " +
                            "CacheManager using the diskStorePath"
            ) ) {
                throw new CacheException(
                        "Attempt to restart an already started EhCacheRegionFactory. " +
                                "Use sessionFactory.close() between repeated calls to buildSessionFactory. " +
                                "Consider using SingletonEhCacheRegionFactory. Error from ehcache was: " + e.getMessage()
                );
            }
            else {
                throw new CacheException( e );
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    public void stop() {
        try {
            if ( manager != null ) {
                mbeanRegistrationHelper.unregisterMBean();
                manager.shutdown();
                manager = null;
            }
        }
        catch ( net.sf.ehcache.CacheException e ) {
            throw new CacheException( e );
        }
    }

}