001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.logging.log4j.core.osgi; 019 020 import java.util.concurrent.atomic.AtomicReference; 021 022 import org.apache.logging.log4j.Logger; 023 import org.apache.logging.log4j.core.config.plugins.util.PluginManager; 024 import org.apache.logging.log4j.core.util.BundleResourceLoader; 025 import org.apache.logging.log4j.status.StatusLogger; 026 import org.osgi.framework.Bundle; 027 import org.osgi.framework.BundleActivator; 028 import org.osgi.framework.BundleContext; 029 import org.osgi.framework.BundleEvent; 030 import org.osgi.framework.SynchronousBundleListener; 031 032 /** 033 * OSGi BundleActivator. 034 */ 035 public final class Activator implements BundleActivator, SynchronousBundleListener { 036 037 private static final Logger LOGGER = StatusLogger.getLogger(); 038 039 private final AtomicReference<BundleContext> context = new AtomicReference<BundleContext>(); 040 041 @Override 042 public void start(final BundleContext context) throws Exception { 043 if (this.context.compareAndSet(null, context)) { 044 context.addBundleListener(this); 045 // done after the BundleListener as to not miss any new bundle installs in the interim 046 scanInstalledBundlesForPlugins(context); 047 } 048 } 049 050 private static void scanInstalledBundlesForPlugins(final BundleContext context) { 051 final Bundle[] bundles = context.getBundles(); 052 for (final Bundle bundle : bundles) { 053 if (bundle.getState() == Bundle.ACTIVE) { 054 // TODO: bundle state can change during this 055 scanBundleForPlugins(bundle); 056 } 057 } 058 } 059 060 private static void scanBundleForPlugins(final Bundle bundle) { 061 LOGGER.trace("Scanning bundle [{}] for plugins.", bundle.getSymbolicName()); 062 PluginManager.loadPlugins(new BundleResourceLoader(bundle)); 063 } 064 065 @Override 066 public void stop(final BundleContext context) throws Exception { 067 // not much can be done that isn't already automated by the framework 068 this.context.compareAndSet(context, null); 069 } 070 071 @Override 072 public void bundleChanged(BundleEvent event) { 073 switch (event.getType()) { 074 case BundleEvent.STARTED: 075 scanBundleForPlugins(event.getBundle()); 076 break; 077 078 default: 079 break; 080 } 081 } 082 }