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
9 package org.opendaylight.controller.config.manager.impl.util;
11 import static com.google.common.base.Preconditions.checkNotNull;
12 import java.util.ArrayList;
13 import java.util.List;
14 import java.util.ListIterator;
15 import org.osgi.framework.BundleContext;
16 import org.osgi.framework.ServiceRegistration;
17 import org.osgi.util.tracker.BundleTracker;
18 import org.osgi.util.tracker.ServiceTracker;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
22 public class OsgiRegistrationUtil {
23 private static final Logger LOGGER = LoggerFactory.getLogger(OsgiRegistrationUtil.class);
25 private OsgiRegistrationUtil() {
29 public static <T> AutoCloseable registerService(final BundleContext bundleContext, final T service, final Class<? super T> ... interfaces) {
30 checkNotNull(service);
31 checkNotNull(interfaces);
32 List<AutoCloseable> autoCloseableList = new ArrayList<>();
33 for (Class<? super T> ifc : interfaces) {
34 ServiceRegistration<? super T> serviceRegistration = bundleContext.registerService(ifc, service, null);
35 autoCloseableList.add(wrap(serviceRegistration));
37 return aggregate(autoCloseableList);
40 public static AutoCloseable wrap(final ServiceRegistration<?> reg) {
42 return new AutoCloseable() {
44 public void close() throws Exception {
50 public static AutoCloseable wrap(final BundleTracker<?> bundleTracker) {
51 checkNotNull(bundleTracker);
52 return new AutoCloseable() {
54 public void close() throws Exception {
55 bundleTracker.close();
60 public static AutoCloseable wrap(final ServiceTracker<?, ?> serviceTracker) {
61 checkNotNull(serviceTracker);
62 return new AutoCloseable() {
64 public void close() throws Exception {
65 serviceTracker.close();
71 * Close list of auto closeables in reverse order
73 public static AutoCloseable aggregate(final List<? extends AutoCloseable> list) {
76 return new AutoCloseable() {
78 public void close() throws Exception {
79 Exception firstException = null;
80 for (ListIterator<? extends AutoCloseable> it = list.listIterator(list.size()); it.hasPrevious();) {
81 AutoCloseable ac = it.previous();
84 } catch (Exception e) {
85 LOGGER.warn("Exception while closing {}", ac, e);
86 if (firstException == null) {
89 firstException.addSuppressed(e);
93 if (firstException != null) {