2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.config.manager.impl.osgi;
10 import static java.lang.String.format;
11 import com.google.common.annotations.VisibleForTesting;
12 import com.google.common.base.Charsets;
13 import com.google.common.io.Resources;
14 import java.io.IOException;
16 import org.opendaylight.controller.config.spi.ModuleFactory;
17 import org.osgi.framework.Bundle;
18 import org.osgi.framework.BundleEvent;
19 import org.osgi.framework.ServiceRegistration;
20 import org.osgi.util.tracker.BundleTrackerCustomizer;
21 import org.slf4j.Logger;
22 import org.slf4j.LoggerFactory;
25 * OSGi extender that listens for bundle activation events. Reads file
26 * META-INF/services/org.opendaylight.controller.config.spi.ModuleFactory, each
27 * line should contain an implementation of ModuleFactory interface. Creates new
28 * instance with default constructor and registers it into OSGi service
29 * registry. There is no need for listening for implementing removedBundle as
30 * the services are unregistered automatically.
31 * Code based on http://www.toedter.com/blog/?p=236
33 public class ModuleFactoryBundleTracker implements BundleTrackerCustomizer<Object> {
34 private final BlankTransactionServiceTracker blankTransactionServiceTracker;
35 private static final Logger LOG = LoggerFactory.getLogger(ModuleFactoryBundleTracker.class);
37 public ModuleFactoryBundleTracker(BlankTransactionServiceTracker blankTransactionServiceTracker) {
38 this.blankTransactionServiceTracker = blankTransactionServiceTracker;
42 public Object addingBundle(Bundle bundle, BundleEvent event) {
43 URL resource = bundle.getEntry("META-INF/services/" + ModuleFactory.class.getName());
44 LOG.trace("Got addingBundle event of bundle {}, resource {}, event {}",
45 bundle, resource, event);
46 if (resource != null) {
48 for (String factoryClassName : Resources.readLines(resource, Charsets.UTF_8)) {
49 registerFactory(factoryClassName, bundle);
51 } catch (IOException e) {
52 LOG.error("Error while reading {}", resource, e);
53 throw new RuntimeException(e);
60 public void modifiedBundle(Bundle bundle, BundleEvent event, Object object) {
65 public void removedBundle(Bundle bundle, BundleEvent event, Object object) {
66 // workaround for service tracker not getting removed service event
67 blankTransactionServiceTracker.blankTransaction();
71 protected static ServiceRegistration<?> registerFactory(String factoryClassName, Bundle bundle) {
75 Class<?> clazz = bundle.loadClass(factoryClassName);
76 if (ModuleFactory.class.isAssignableFrom(clazz)) {
78 LOG.debug("Registering {} in bundle {}",
79 clazz.getName(), bundle);
80 return bundle.getBundleContext().registerService(
81 ModuleFactory.class.getName(), clazz.newInstance(),
83 } catch (InstantiationException e) {
84 errorMessage = logMessage(
85 "Could not instantiate {} in bundle {}, reason {}",
86 factoryClassName, bundle, e);
88 } catch (IllegalAccessException e) {
89 errorMessage = logMessage(
90 "Illegal access during instantiation of class {} in bundle {}, reason {}",
91 factoryClassName, bundle, e);
95 errorMessage = logMessage(
96 "Class {} does not implement {} in bundle {}", clazz,
97 ModuleFactory.class, bundle);
99 } catch (ClassNotFoundException e) {
100 errorMessage = logMessage(
101 "Could not find class {} in bundle {}, reason {}",
102 factoryClassName, bundle, e);
106 throw ex == null ? new IllegalStateException(errorMessage) : new IllegalStateException(errorMessage, ex);
109 public static String logMessage(String slfMessage, Object... params) {
110 LOG.info(slfMessage, params);
111 String formatMessage = slfMessage.replaceAll("\\{\\}", "%s");
112 return format(formatMessage, params);