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