| /** |
| * 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.servicemix.specs.activator; |
| |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.net.URL; |
| import java.util.Enumeration; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| import org.apache.servicemix.specs.locator.OsgiLocator; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleActivator; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.BundleEvent; |
| import org.osgi.framework.SynchronousBundleListener; |
| |
| public class Activator implements BundleActivator, SynchronousBundleListener { |
| |
| private static boolean debug = false; |
| |
| private ConcurrentMap<Long, Map<String, Callable<Class>>> factories = new ConcurrentHashMap<Long, Map<String, Callable<Class>>>(); |
| |
| private BundleContext bundleContext; |
| |
| static { |
| try { |
| String prop = System.getProperty("org.apache.servicemix.specs.debug"); |
| debug = prop != null && !"false".equals(prop); |
| } catch (Throwable t) { } |
| } |
| |
| /** |
| * <p>Output debugging messages.</p> |
| * |
| * @param msg <code>String</code> to print to <code>stderr</code>. |
| */ |
| protected void debugPrintln(String msg) { |
| if (debug) { |
| System.err.println("Spec(" + bundleContext.getBundle().getBundleId() + "): " + msg); |
| } |
| } |
| |
| public synchronized void start(BundleContext bundleContext) throws Exception { |
| this.bundleContext = bundleContext; |
| debugPrintln("activating"); |
| debugPrintln("adding bundle listener"); |
| bundleContext.addBundleListener(this); |
| debugPrintln("checking existing bundles"); |
| for (Bundle bundle : bundleContext.getBundles()) { |
| if (bundle.getState() == Bundle.RESOLVED || bundle.getState() == Bundle.STARTING || |
| bundle.getState() == Bundle.ACTIVE || bundle.getState() == Bundle.STOPPING) { |
| register(bundle); |
| } |
| } |
| debugPrintln("activated"); |
| } |
| |
| public synchronized void stop(BundleContext bundleContext) throws Exception { |
| debugPrintln("deactivating"); |
| bundleContext.removeBundleListener(this); |
| while (!factories.isEmpty()) { |
| unregister(factories.keySet().iterator().next()); |
| } |
| debugPrintln("deactivated"); |
| this.bundleContext = null; |
| } |
| |
| public void bundleChanged(BundleEvent event) { |
| if (event.getType() == BundleEvent.RESOLVED) { |
| register(event.getBundle()); |
| } else if (event.getType() == BundleEvent.UNRESOLVED || event.getType() == BundleEvent.UNINSTALLED) { |
| unregister(event.getBundle().getBundleId()); |
| } |
| } |
| |
| protected void register(final Bundle bundle) { |
| debugPrintln("checking bundle " + bundle.getBundleId()); |
| Map<String, Callable<Class>> map = factories.get(bundle.getBundleId()); |
| Enumeration e = bundle.findEntries("META-INF/services/", "*", false); |
| if (e != null) { |
| while (e.hasMoreElements()) { |
| final URL u = (URL) e.nextElement(); |
| final String url = u.toString(); |
| if (url.endsWith("/")) { |
| continue; |
| } |
| final String factoryId = url.substring(url.lastIndexOf("/") + 1); |
| if (map == null) { |
| map = new HashMap<String, Callable<Class>>(); |
| factories.put(bundle.getBundleId(), map); |
| } |
| map.put(factoryId, new BundleFactoryLoader(factoryId, u, bundle)); |
| } |
| } |
| if (map != null) { |
| for (Map.Entry<String, Callable<Class>> entry : map.entrySet()) { |
| debugPrintln("registering service for key " + entry.getKey() + " with value " + entry.getValue()); |
| OsgiLocator.register(entry.getKey(), entry.getValue()); |
| } |
| } |
| } |
| |
| protected void unregister(long bundleId) { |
| Map<String, Callable<Class>> map = factories.remove(bundleId); |
| if (map != null) { |
| for (Map.Entry<String, Callable<Class>> entry : map.entrySet()) { |
| debugPrintln("unregistering service for key " + entry.getKey() + " with value " + entry.getValue()); |
| OsgiLocator.unregister(entry.getKey(), entry.getValue()); |
| } |
| } |
| } |
| |
| private class BundleFactoryLoader implements Callable<Class> { |
| private final String factoryId; |
| private final URL u; |
| private final Bundle bundle; |
| private volatile Class<?> clazz; |
| |
| public BundleFactoryLoader(String factoryId, URL u, Bundle bundle) { |
| this.factoryId = factoryId; |
| this.u = u; |
| this.bundle = bundle; |
| } |
| |
| public Class call() throws Exception { |
| try { |
| debugPrintln("loading factory for key: " + factoryId); |
| |
| if (clazz == null){ |
| synchronized (this) { |
| if (clazz == null){ |
| debugPrintln("creating factory for key: " + factoryId); |
| BufferedReader br = new BufferedReader(new InputStreamReader(u.openStream(), "UTF-8")); |
| String factoryClassName = br.readLine(); |
| br.close(); |
| debugPrintln("factory implementation: " + factoryClassName); |
| clazz = bundle.loadClass(factoryClassName); |
| } |
| } |
| } |
| return clazz; |
| } catch (Exception e) { |
| debugPrintln("exception caught while creating factory: " + e); |
| throw e; |
| } catch (Error e) { |
| debugPrintln("error caught while creating factory: " + e); |
| throw e; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return u.toString(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return u.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof BundleFactoryLoader) { |
| return u.equals(((BundleFactoryLoader) obj).u); |
| } else { |
| return false; |
| } |
| } |
| } |
| } |