bgp/rib-mock/src/main/java/org/opendaylight/protocol/bgp/rib/mock/EventBusRegistration.java

   1 /*
   2  * Copyright (c) 2013 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.protocol.bgp.rib.mock;
   9
  10 import java.util.List;
  11 import java.util.Set;
  12
  13 import org.opendaylight.protocol.bgp.parser.BGPSession;
  14 import org.opendaylight.protocol.bgp.parser.BGPSessionListener;
  15 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
  16 import org.opendaylight.protocol.concepts.ListenerRegistration;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Keepalive;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.BgpParameters;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.CMultiprotocol;
  22 import org.opendaylight.yangtools.yang.binding.Notification;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 import com.google.common.collect.Sets;
  27 import com.google.common.eventbus.EventBus;
  28 import com.google.common.eventbus.Subscribe;
  29
  30 /**
  31  * This class has @Subscribe annotated methods which receive events from {@link EventBus} . Events are produced by
  32  * {@link BGPMock}, and each instance notifies exactly one {@link BGPSessionListener}.
  33  */
  34 final class EventBusRegistration extends ListenerRegistration<BGPSessionListener> {
  35
  36         private static final Logger LOG = LoggerFactory.getLogger(EventBusRegistration.class);
  37
  38         private final EventBus eventBus;
  39
  40         public static EventBusRegistration createAndRegister(final EventBus eventBus, final BGPSessionListener listener,
  41                         final List<Notification> allPreviousMessages) {
  42                 final EventBusRegistration instance = new EventBusRegistration(eventBus, listener, allPreviousMessages);
  43                 eventBus.register(instance);
  44                 return instance;
  45         }
  46
  47         private EventBusRegistration(final EventBus eventBus, final BGPSessionListener listener, final List<Notification> allPreviousMessages) {
  48                 super(listener);
  49                 this.eventBus = eventBus;
  50                 for (final Notification message : allPreviousMessages) {
  51                         sendMessage(listener, message);
  52                 }
  53         }
  54
  55         @Subscribe
  56         public void onMessage(final Notification message) {
  57                 sendMessage(this.listener, message);
  58         }
  59
  60         @Override
  61         public synchronized void removeRegistration() {
  62                 this.eventBus.unregister(this);
  63         }
  64
  65         private static void sendMessage(final BGPSessionListener listener, final Notification message) {
  66                 if (BGPMock.CONNECTION_LOST_MAGIC_MSG.equals(message)) {
  67                         listener.onSessionTerminated(null, null);
  68                 } else if (message instanceof Open) {
  69                         final Set<BgpTableType> tts = Sets.newHashSet();
  70                         for (final BgpParameters param : ((Open) message).getBgpParameters()) {
  71                                 if (param.getCParameters() instanceof CMultiprotocol) {
  72                                         final CMultiprotocol p = (CMultiprotocol) param.getCParameters();
  73                                         LOG.debug("Adding open parameter {}", p);
  74                                         final BgpTableType type = new BgpTableTypeImpl(p.getMultiprotocolCapability().getAfi(), p.getMultiprotocolCapability().getSafi());
  75                                         tts.add(type);
  76                                 }
  77                         }
  78
  79                         listener.onSessionUp(new BGPSession() {
  80
  81                                 @Override
  82                                 public void close() {
  83                                         LOG.debug("Session {} closed", this);
  84                                 }
  85
  86                                 @Override
  87                                 public Set<BgpTableType> getAdvertisedTableTypes() {
  88                                         return tts;
  89                                 }
  90                         });
  91                 } else if (!(message instanceof Keepalive)) {
  92                         listener.onMessage(null, message);
  93                 }
  94         }
  95 }