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.DataBroker;
  16 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  17 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
  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.network.topology.Topology;
  25 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  26 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  27 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 import com.google.common.base.Preconditions;
  32 import com.google.common.eventbus.EventBus;
  33
  34 public class VppNodeListener implements DataTreeChangeListener<Node>, AutoCloseable {
  35
  36     private static final Logger LOG = LoggerFactory.getLogger(VppNodeListener.class);
  37
  38     private final ListenerRegistration<VppNodeListener> listenerRegistration;
  39     private final VppNodeManager nodeManager;
  40     private final EventBus eventBus;
  41
  42     public VppNodeListener(DataBroker dataBroker, VppNodeManager nodeManager, EventBus eventBus) {
  43         this.nodeManager = Preconditions.checkNotNull(nodeManager);
  44         this.eventBus = Preconditions.checkNotNull(eventBus);
  45         // Register listener
  46         final DataTreeIdentifier<Node> networkTopologyPath = new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
  47                 InstanceIdentifier.builder(NetworkTopology.class).child(Topology.class).child(Node.class).build());
  48         listenerRegistration =
  49                 Preconditions.checkNotNull(dataBroker.registerDataTreeChangeListener(networkTopologyPath, this));
  50         LOG.info("Network-Topology VppNodelistener registered");
  51     }
  52
  53     @Override
  54     public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<Node>> changes) {
  55         LOG.debug("Topology Node changed. Changes {}", changes);
  56
  57         for (DataTreeModification<Node> modification : changes) {
  58             DataObjectModification<Node> rootNode = modification.getRootNode();
  59             Node dataAfter = rootNode.getDataAfter();
  60             Node dataBefore = rootNode.getDataBefore();
  61             NodeOperEvent event =
  62                     new NodeOperEvent(modification.getRootPath().getRootIdentifier(), dataBefore, dataAfter);
  63             eventBus.post(event);
  64             nodeManager.syncNodes(dataAfter, dataBefore);
  65         }
  66     }
  67
  68     public ListenerRegistration<VppNodeListener> getRegistrationObject() {
  69         return listenerRegistration;
  70     }
  71
  72     @Override
  73     public void close() throws Exception {
  74         listenerRegistration.close();
  75     }
  76 }