org.openeos.hibernate.internal.observers.DialectPublisherObserver.java Source code

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Here is the source code for org.openeos.hibernate.internal.observers.DialectPublisherObserver.java

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/**
 * Copyright 2014 Fernando Rincon Martin <frm.rincon@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.openeos.hibernate.internal.observers;

import java.util.Hashtable;

import org.hibernate.SessionFactory;
import org.hibernate.SessionFactoryObserver;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.exception.spi.ConversionContext;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DialectPublisherObserver implements SessionFactoryObserver {

    private static final Logger LOG = LoggerFactory.getLogger(DialectPublisherObserver.class);

    private static final long serialVersionUID = 1L;

    public static final String DIALECT_PID = "unoDialect";

    private BundleContext bundleContext;

    private ServiceRegistration<?> dialectService;

    public DialectPublisherObserver(BundleContext bundleContext) {
        this.bundleContext = bundleContext;
    }

    public void destroy() {
        if (dialectService != null) {
            dialectService.unregister();
            dialectService = null;
        }
    }

    @Override
    public void sessionFactoryCreated(SessionFactory factory) {
        LOG.debug("Session factory created, registering its dialect as a service");
        if (dialectService != null) {
            LOG.debug("Unregistering old dialect");
            dialectService.unregister();
            dialectService = null;
        }
        Hashtable<String, Object> properties = new Hashtable<String, Object>();
        properties.put(Constants.SERVICE_PID, DIALECT_PID);
        dialectService = bundleContext.registerService(
                new String[] { Dialect.class.getName(), ConversionContext.class.getName() },
                ((SessionFactoryImplementor) factory).getDialect(), properties);

        LOG.debug("Dialect registered as a service with service.pid='{}'", DIALECT_PID);
    }

    @Override
    public void sessionFactoryClosed(SessionFactory factory) {
        LOG.debug("Session factory Closed, unregistering dialect service");
        dialectService.unregister();
        dialectService = null;
    }

}