opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/sal/dom/broker/osgi/AbstractBrokerServiceProxy.java

   1 /*
   2  * Copyright (c) 2014 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 package org.opendaylight.controller.sal.dom.broker.osgi;
   9
  10 import static com.google.common.base.Preconditions.checkNotNull;
  11 import static com.google.common.base.Preconditions.checkState;
  12
  13 import java.util.Collections;
  14 import java.util.HashSet;
  15 import java.util.Set;
  16
  17 import javax.annotation.Nullable;
  18
  19 import org.opendaylight.controller.sal.core.api.BrokerService;
  20 import org.opendaylight.yangtools.concepts.Registration;
  21 import org.osgi.framework.ServiceReference;
  22
  23 public abstract class AbstractBrokerServiceProxy<T extends BrokerService> implements AutoCloseable, BrokerService {
  24
  25     private T delegate;
  26     private final ServiceReference<T> reference;
  27
  28     public AbstractBrokerServiceProxy(final @Nullable ServiceReference<T> ref, final T delegate) {
  29         this.delegate = checkNotNull(delegate, "Delegate should not be null.");
  30         this.reference = ref;
  31     }
  32
  33     protected final T getDelegate() {
  34         checkState(delegate != null, "Proxy was closed and unregistered.");
  35         return delegate;
  36     }
  37
  38     protected final ServiceReference<T> getReference() {
  39         return reference;
  40     }
  41
  42     private final Set<Registration> registrations = Collections.synchronizedSet(new HashSet<Registration>());
  43
  44     protected <R extends Registration> R addRegistration(final R registration) {
  45         if (registration != null) {
  46             registrations.add(registration);
  47         }
  48         return registration;
  49     }
  50
  51     protected void closeBeforeUnregistrations() {
  52         // NOOP
  53     }
  54
  55     protected void closeAfterUnregistrations() {
  56         // NOOP
  57     }
  58
  59     @Override
  60     @SuppressWarnings("checkstyle:IllegalCatch")
  61     public void close() {
  62         if (delegate != null) {
  63             delegate = null;
  64             RuntimeException potentialException = new RuntimeException(
  65                     "Uncaught exceptions occured during unregistration");
  66             boolean hasSuppressed = false;
  67             for (Registration registration : registrations) {
  68                 try {
  69                     registration.close();
  70                 } catch (Exception e) {
  71                     potentialException.addSuppressed(e);
  72                     hasSuppressed = true;
  73                 }
  74             }
  75             if (hasSuppressed) {
  76                 throw potentialException;
  77             }
  78         }
  79     }
  80 }