org.apache.openjpa.persistence.osgi.PersistenceActivator Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.openjpa.persistence.osgi;
import java.util.Hashtable;
import javax.persistence.spi.PersistenceProvider;
import org.apache.openjpa.ee.OSGiManagedRuntime;
import org.apache.openjpa.persistence.PersistenceProviderImpl;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
/**
* Used to discover/resolve JPA providers in an OSGi environment.
*
* @version $Rev$ $Date$
*/
public class PersistenceActivator implements BundleActivator {
// following is so Aries can find and extend us for OSGi RFC 143
public static final String PERSISTENCE_PROVIDER_ARIES = "javax.persistence.provider";
// following would be set by Aries to expose their OSGi enabled provider
public static final String PERSISTENCE_PROVIDER = PersistenceProvider.class.getName();
public static final String OSGI_PERSISTENCE_PROVIDER = PersistenceProviderImpl.class.getName();
private static BundleContext ctx = null;
private static ServiceRegistration svcReg = null;
/* (non-Javadoc)
* @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
*/
public void start(BundleContext ctx) throws Exception {
this.ctx = ctx;
PersistenceProvider provider = new PersistenceProviderImpl();
Hashtable props = new Hashtable();
// Aries queries for service providers by property "javax.persistence.provider"
props.put(PERSISTENCE_PROVIDER_ARIES, OSGI_PERSISTENCE_PROVIDER);
// The persistence service tracker in the geronimo spec api bundle examines
// the property named "javax.persistence.PersistenceProvider" rather than
// the the property provided for Aries. In order to properly track the OpenJPA
// provider, this property must be set upon service registration.
props.put(PERSISTENCE_PROVIDER, OSGI_PERSISTENCE_PROVIDER);
svcReg = ctx.registerService(PERSISTENCE_PROVIDER, provider, props);
OSGiManagedRuntime.registerServiceListener(ctx);
}
/* (non-Javadoc)
* @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
*/
public void stop(BundleContext ctx) throws Exception {
OSGiManagedRuntime.deregisterServiceListener(ctx);
if (svcReg != null) {
svcReg.unregister();
svcReg = null;
}
this.ctx = null;
}
/* (non-Javadoc)
* OPENJPA-1491 Allow us to use the OSGi Bundle's ClassLoader instead of the application one.
* This class and method are dynamically loaded by BundleUtils, so any method signature changes
* here need to also be reflected in BundleUtils.getBundleClassLoader()
*/
public static ClassLoader getBundleClassLoader() {
ClassLoader cl = null;
if (ctx != null) {
Bundle b = ctx.getBundle();
cl = new BundleDelegatingClassLoader(b);
}
return cl;
}
}