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 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 }