applications/topology-lldp-discovery/src/main/java/org/opendaylight/openflowplugin/applications/topology/lldp/LLDPDiscoveryListener.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.openflowplugin.applications.topology.lldp;
   9
  10 import javax.inject.Inject;
  11 import javax.inject.Singleton;
  12 import org.apache.aries.blueprint.annotation.service.Reference;
  13 import org.opendaylight.mdsal.binding.api.NotificationPublishService;
  14 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipService;
  15 import org.opendaylight.openflowplugin.applications.topology.lldp.utils.LLDPDiscoveryUtils;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.topology.discovery.rev130819.LinkDiscovered;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.topology.discovery.rev130819.LinkDiscoveredBuilder;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorRef;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingListener;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketReceived;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 @Singleton
  27 public class LLDPDiscoveryListener implements PacketProcessingListener {
  28     private static final Logger LOG = LoggerFactory.getLogger(LLDPDiscoveryListener.class);
  29
  30     private final LLDPLinkAger lldpLinkAger;
  31     private final NotificationPublishService notificationService;
  32     private final EntityOwnershipService eos;
  33
  34     @Inject
  35     public LLDPDiscoveryListener(@Reference final NotificationPublishService notificationService,
  36             final LLDPLinkAger lldpLinkAger, @Reference final EntityOwnershipService entityOwnershipService) {
  37         this.notificationService = notificationService;
  38         this.lldpLinkAger = lldpLinkAger;
  39         this.eos = entityOwnershipService;
  40     }
  41
  42     @Override
  43     public void onPacketReceived(final PacketReceived lldp) {
  44         NodeConnectorRef src = LLDPDiscoveryUtils.lldpToNodeConnectorRef(lldp.getPayload(), true);
  45         if (src != null) {
  46             final NodeKey nodeKey = lldp.getIngress().getValue().firstKeyOf(Node.class);
  47             LOG.debug("LLDP packet received for destination node {}", nodeKey);
  48             if (nodeKey != null) {
  49                 final LinkDiscoveredBuilder ldb = new LinkDiscoveredBuilder();
  50                 ldb.setDestination(lldp.getIngress());
  51                 ldb.setSource(new NodeConnectorRef(src));
  52                 final LinkDiscovered ld = ldb.build();
  53                 final boolean linkWasPresent = lldpLinkAger.isLinkPresent(ld);
  54                 lldpLinkAger.put(ld);
  55                 if (LLDPDiscoveryUtils.isEntityOwned(this.eos, nodeKey.getId().getValue())) {
  56                     if (linkWasPresent) {
  57                         LOG.trace("Link {} already present in the cache, skip publishing the notification.", ld);
  58                     } else {
  59                         LOG.debug("Publish add event for link {}", ld);
  60                         try {
  61                             notificationService.putNotification(ld);
  62                         } catch (InterruptedException e) {
  63                             LOG.warn("Interrupted while publishing notification {}", ld, e);
  64                         }
  65                     }
  66                 } else {
  67                     LOG.trace("Skip publishing the add event for link because controller is non-owner of the "
  68                             + "node {}. Link : {}", nodeKey.getId().getValue(), ld);
  69                 }
  70             } else {
  71                 LOG.debug("LLDP packet ignored. Unable to extract node-key from packet-in ingress.");
  72             }
  73         }
  74     }
  75 }