| /* |
| // * 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 WARRANTIESOR 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.aries.jpa.eclipselink.adapter; |
| |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleActivator; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.BundleEvent; |
| import org.osgi.framework.BundleListener; |
| import org.osgi.framework.Constants; |
| import org.osgi.framework.ServiceFactory; |
| import org.osgi.framework.ServiceRegistration; |
| import org.osgi.framework.wiring.BundleRevision; |
| import org.osgi.framework.wiring.BundleWire; |
| import org.osgi.framework.wiring.BundleWiring; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Dictionary; |
| import java.util.HashSet; |
| import java.util.Hashtable; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| import javax.persistence.EntityManagerFactory; |
| import javax.persistence.spi.PersistenceProvider; |
| |
| /** |
| * Eclipselink adapter main class. |
| * |
| * The purpose of this class is to: |
| * <ul> |
| * <li>publish an OSGi-compatible Eclipselink {@link PersistenceProvider} service in the service registry</li> |
| * <li>intercept {@link EntityManagerFactory} creation to ensure that the Eclipselink target server (if not specified otherwise) |
| * is OSGi compatible</li> |
| * </ul> |
| */ |
| public class Activator implements BundleActivator, BundleListener { |
| public static final String ECLIPSELINK_JPA_PROVIDER_BUNDLE_SYMBOLIC_NAME = "org.eclipse.persistence.jpa"; |
| public static final String ECLIPSELINK_JPA_PROVIDER_CLASS_NAME = "org.eclipse.persistence.jpa.PersistenceProvider"; |
| private final ConcurrentMap<Bundle, ServiceRegistration<?>> registeredProviders = new ConcurrentHashMap<Bundle, ServiceRegistration<?>>(); |
| |
| private static final Logger logger = LoggerFactory.getLogger(Activator.class); |
| |
| private BundleContext context; |
| |
| public void start(BundleContext ctx) { |
| logger.debug("Starting EclipseLink adapter"); |
| |
| context = ctx; |
| |
| ctx.addBundleListener(this); |
| |
| for (Bundle b : ctx.getBundles()) { |
| if ((b.getState() & (Bundle.ACTIVE | Bundle.STARTING | Bundle.RESOLVED | Bundle.STOPPING)) != 0) |
| handlePotentialEclipseLink(b); |
| } |
| } |
| |
| public void stop(BundleContext ctx) { |
| logger.debug("Stopping EclipseLink adapter"); |
| |
| for (ServiceRegistration<?> reg : registeredProviders.values()) { |
| reg.unregister(); |
| } |
| } |
| |
| public void bundleChanged(BundleEvent event) { |
| if ((event.getType() & (BundleEvent.RESOLVED)) != 0) { |
| handlePotentialEclipseLink(event.getBundle()); |
| } else if (event.getType() == BundleEvent.UNRESOLVED | event.getType() == BundleEvent.UNINSTALLED) { |
| ServiceRegistration<?> reg = registeredProviders.remove(event.getBundle()); |
| if (reg != null) { |
| reg.unregister(); |
| } |
| } |
| } |
| |
| private void handlePotentialEclipseLink(Bundle b) { |
| if (b.getSymbolicName().equals(ECLIPSELINK_JPA_PROVIDER_BUNDLE_SYMBOLIC_NAME)) { |
| logger.debug("Found EclipseLink bundle {}", b); |
| |
| // make sure we can actually find the JPA provider we expect to find |
| try { |
| b.loadClass(ECLIPSELINK_JPA_PROVIDER_CLASS_NAME); |
| } catch (ClassNotFoundException cnfe) { |
| logger.debug("Did not find provider class, exiting"); |
| // not one we can handle |
| return; |
| } |
| |
| if (!!!registeredProviders.containsKey(b)) { |
| logger.debug("Adding new EclipseLink provider for bundle {}", b); |
| |
| ServiceFactory<PersistenceProvider> factory = new EclipseLinkProviderService(b); |
| |
| Dictionary<String, Object> props = new Hashtable<String, Object>(); |
| props.put("org.apache.aries.jpa.container.weaving.packages", getJPAPackages(b)); |
| props.put("javax.persistence.provider", ECLIPSELINK_JPA_PROVIDER_CLASS_NAME); |
| |
| ServiceRegistration<?> reg = context.registerService( |
| PersistenceProvider.class.getName(), factory, props); |
| |
| ServiceRegistration<?> old = registeredProviders.putIfAbsent(b, reg); |
| if (old != null) { |
| reg.unregister(); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Get all the relevant packages that the EclipseLink JPA provider exports or persistence packages it uses itself. These are needed |
| * so that the woven proxy (for runtime enhancement) can be used later on :) |
| * |
| * Note that differently to OpenJPA the relevant classes are actually in more than just one bundle (org.eclipse.persistence.jpa and org.eclipse.persistence.core |
| * at the time of this writing). Hence, we have to take more than just the packages of the JPA provider bundle into account ... |
| * |
| * @param jpaBundle |
| * @return |
| */ |
| private String[] getJPAPackages(Bundle jpaBundle) { |
| Set<String> result = new HashSet<String>(); |
| |
| for (Bundle b : context.getBundles()) { |
| BundleWiring bw = b.adapt(BundleWiring.class); |
| if(bw != null) { |
| List<BundleWire> wires = bw.getProvidedWires(BundleRevision.PACKAGE_NAMESPACE); |
| |
| for (BundleWire w : wires) { |
| String pkgName = (String) w.getCapability().getAttributes().get(BundleRevision.PACKAGE_NAMESPACE); |
| |
| boolean add = false; |
| if (b.equals(jpaBundle)) { |
| add = true; |
| } else if (pkgName.startsWith("org.eclipse.persistence")) { |
| add = true; |
| } |
| |
| if (add) { |
| String suffix = ";" + Constants.BUNDLE_SYMBOLICNAME_ATTRIBUTE + "=" + b.getSymbolicName() + ";" + Constants.BUNDLE_VERSION_ATTRIBUTE + "=" + b.getVersion(); |
| result.add(pkgName + suffix); |
| } |
| } |
| } |
| } |
| |
| result.add("org.apache.aries.jpa.eclipselink.adapter.platform;" + |
| Constants.BUNDLE_SYMBOLICNAME_ATTRIBUTE + "=" + context.getBundle().getSymbolicName() + ";" + |
| Constants.BUNDLE_VERSION_ATTRIBUTE + "=" + context.getBundle().getVersion()); |
| |
| logger.debug("Found JPA packages {}", result); |
| |
| return result.toArray(new String[0]); |
| } |
| } |