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