renderers/ios-xe/src/main/java/org/opendaylight/groupbasedpolicy/renderer/ios_xe_provider/impl/listener/IosXeCapableNodeListenerImpl.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.ios_xe_provider.impl.listener;
  10
  11 import com.google.common.base.Preconditions;
  12 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  13 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  14 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
  15 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  16 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  17 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  18 import org.opendaylight.groupbasedpolicy.renderer.ios_xe_provider.impl.manager.NodeManager;
  19 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  20 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  21 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 import javax.annotation.Nonnull;
  26 import java.util.Collection;
  27
  28 import static org.opendaylight.sfc.provider.SfcProviderDebug.printTraceStart;
  29
  30 public class IosXeCapableNodeListenerImpl implements DataTreeChangeListener<NetworkTopology>, AutoCloseable {
  31
  32     private static final Logger LOG = LoggerFactory.getLogger(IosXeCapableNodeListenerImpl.class);
  33     private final NodeManager nodeManager;
  34
  35     private final ListenerRegistration listenerRegistration;
  36
  37
  38     public IosXeCapableNodeListenerImpl(final DataBroker dataBroker, final NodeManager nodeManager) {
  39         this.nodeManager = Preconditions.checkNotNull(nodeManager);
  40         final DataTreeIdentifier<NetworkTopology> networkTopologyPath = new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
  41                 InstanceIdentifier.builder(NetworkTopology.class).build());
  42         listenerRegistration = Preconditions.checkNotNull(dataBroker
  43                 .registerDataTreeChangeListener(networkTopologyPath, this));
  44         LOG.info("network-topology listener registered");
  45     }
  46
  47     @Override
  48     public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<NetworkTopology>> changes) {
  49         printTraceStart(LOG);
  50         for (DataTreeModification<NetworkTopology> modification : changes) {
  51             DataObjectModification<NetworkTopology> rootNode = modification.getRootNode();
  52             NetworkTopology dataAfter = rootNode.getDataAfter();
  53             NetworkTopology dataBefore = rootNode.getDataBefore();
  54             if (dataAfter != null && dataBefore == null) {
  55                 nodeManager.syncNodes(dataAfter.getTopology(), null);
  56             }
  57             else if (dataAfter == null && dataBefore != null) {
  58                 nodeManager.syncNodes(null, dataBefore.getTopology());
  59             }
  60             else if (dataAfter != null) {
  61                 nodeManager.syncNodes(dataAfter.getTopology(), dataBefore.getTopology());
  62             }
  63         }
  64     }
  65
  66     @Override
  67     public void close() {
  68         listenerRegistration.close();
  69     }
  70 }