renderers/vpp/src/main/java/org/opendaylight/groupbasedpolicy/renderer/vpp/listener/VppNodeListener.java

   1 /*
   2  * Copyright (c) 2016 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
   9 package org.opendaylight.groupbasedpolicy.renderer.vpp.listener;
  10
  11 import java.util.Collection;
  12
  13 import javax.annotation.Nonnull;
  14
  15 import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;
  16 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  17 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  18 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  19 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  20 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  21 import org.opendaylight.groupbasedpolicy.renderer.vpp.event.NodeOperEvent;
  22 import org.opendaylight.groupbasedpolicy.renderer.vpp.manager.VppNodeManager;
  23 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  24 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
  25 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  26 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  27 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  28 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  29 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 import com.google.common.base.Preconditions;
  34 import com.google.common.eventbus.EventBus;
  35
  36 public class VppNodeListener implements ClusteredDataTreeChangeListener<Node>, AutoCloseable {
  37
  38     private static final Logger LOG = LoggerFactory.getLogger(VppNodeListener.class);
  39     private static final TopologyId TOPOLOGY_NETCONF = new TopologyId("topology-netconf");
  40
  41     private final ListenerRegistration<VppNodeListener> listenerRegistration;
  42     private final VppNodeManager nodeManager;
  43     private final EventBus eventBus;
  44
  45     public VppNodeListener(DataBroker dataBroker, VppNodeManager nodeManager, EventBus eventBus) {
  46         this.nodeManager = Preconditions.checkNotNull(nodeManager);
  47         this.eventBus = Preconditions.checkNotNull(eventBus);
  48         // Register listener
  49         final DataTreeIdentifier<Node> networkTopologyPath = new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
  50                 InstanceIdentifier.builder(NetworkTopology.class)
  51                     .child(Topology.class, new TopologyKey(TOPOLOGY_NETCONF))
  52                     .child(Node.class)
  53                     .build());
  54         listenerRegistration =
  55                 Preconditions.checkNotNull(dataBroker.registerDataTreeChangeListener(networkTopologyPath, this));
  56         LOG.info("Network-Topology VppNodeListener registered");
  57     }
  58
  59     @Override
  60     public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<Node>> changes) {
  61         for (DataTreeModification<Node> modification : changes) {
  62             InstanceIdentifier<Node> iid = modification.getRootPath().getRootIdentifier();
  63             LOG.debug("Change detected for network topology node {}.", iid.firstKeyOf(Node.class));
  64             DataObjectModification<Node> rootNode = modification.getRootNode();
  65             Node dataAfter = rootNode.getDataAfter();
  66             Node dataBefore = rootNode.getDataBefore();
  67             NodeOperEvent event = new NodeOperEvent(iid, dataBefore, dataAfter);
  68             eventBus.post(event);
  69             nodeManager.syncNodes(dataAfter, dataBefore);
  70         }
  71     }
  72
  73     public ListenerRegistration<VppNodeListener> getRegistrationObject() {
  74         return listenerRegistration;
  75     }
  76
  77     @Override
  78     public void close() throws Exception {
  79         listenerRegistration.close();
  80     }
  81 }