Fix checkstyle reported by odlparent-3.0.0
[controller.git] / opendaylight / config / config-manager / src / main / java / org / opendaylight / controller / config / manager / impl / util / OsgiRegistrationUtil.java
1 /*
2  * Copyright (c) 2013, 2017 Cisco Systems, Inc. and others.  All rights reserved.
3  *
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
7  */
8
9 package org.opendaylight.controller.config.manager.impl.util;
10
11 import static com.google.common.base.Preconditions.checkNotNull;
12
13 import java.util.ArrayList;
14 import java.util.List;
15 import java.util.ListIterator;
16 import org.osgi.framework.BundleContext;
17 import org.osgi.framework.ServiceRegistration;
18 import org.osgi.util.tracker.BundleTracker;
19 import org.osgi.util.tracker.ServiceTracker;
20 import org.slf4j.Logger;
21 import org.slf4j.LoggerFactory;
22
23 public final class OsgiRegistrationUtil {
24     private static final Logger LOG = LoggerFactory.getLogger(OsgiRegistrationUtil.class);
25
26     private OsgiRegistrationUtil() {
27     }
28
29     @SafeVarargs
30     public static <T> AutoCloseable registerService(final BundleContext bundleContext, final T service,
31             final Class<? super T>... interfaces) {
32         checkNotNull(service);
33         checkNotNull(interfaces);
34         List<AutoCloseable> autoCloseableList = new ArrayList<>();
35         for (Class<? super T> ifc : interfaces) {
36             ServiceRegistration<? super T> serviceRegistration = bundleContext.registerService(ifc, service, null);
37             autoCloseableList.add(wrap(serviceRegistration));
38         }
39         return aggregate(autoCloseableList);
40     }
41
42     public static AutoCloseable wrap(final ServiceRegistration<?> reg) {
43         checkNotNull(reg);
44         return reg::unregister;
45     }
46
47     public static AutoCloseable wrap(final BundleTracker<?> bundleTracker) {
48         checkNotNull(bundleTracker);
49         return bundleTracker::close;
50     }
51
52     public static AutoCloseable wrap(final ServiceTracker<?, ?> serviceTracker) {
53         checkNotNull(serviceTracker);
54         return serviceTracker::close;
55     }
56
57     @SuppressWarnings("IllegalCatch")
58     public static AutoCloseable aggregate(final List<? extends AutoCloseable> list) {
59         checkNotNull(list);
60
61         return () -> {
62             Exception firstException = null;
63             for (ListIterator<? extends AutoCloseable> it = list.listIterator(list.size()); it.hasPrevious();) {
64                 AutoCloseable ac = it.previous();
65                 try {
66                     ac.close();
67                 } catch (final Exception e) {
68                     LOG.warn("Exception while closing {}", ac, e);
69                     if (firstException == null) {
70                         firstException = e;
71                     } else {
72                         firstException.addSuppressed(e);
73                     }
74                 }
75             }
76             if (firstException != null) {
77                 throw firstException;
78             }
79         };
80     }
81 }

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