2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
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
9 package org.opendaylight.netconf.topology.util;
11 import java.util.Collection;
12 import javax.annotation.Nonnull;
13 import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;
14 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
15 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
16 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
17 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
18 import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
19 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
20 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
21 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipChange;
22 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
23 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListenerRegistration;
24 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
25 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
26 import org.opendaylight.netconf.topology.NodeListener;
27 import org.opendaylight.netconf.topology.RoleChangeStrategy;
28 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
29 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
30 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
31 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
32 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
33 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
34 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
35 import org.opendaylight.yangtools.concepts.ListenerRegistration;
36 import org.opendaylight.yangtools.yang.binding.Identifier;
37 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
38 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
39 import org.slf4j.Logger;
40 import org.slf4j.LoggerFactory;
42 public class TopologyRoleChangeStrategy implements RoleChangeStrategy, ClusteredDataTreeChangeListener<Node>, EntityOwnershipListener {
44 private static final Logger LOG = LoggerFactory.getLogger(TopologyRoleChangeStrategy.class);
46 private final DataBroker dataBroker;
48 private final EntityOwnershipService entityOwnershipService;
49 private NodeListener ownershipCandidate;
50 private final String entityType;
51 // use topologyId as entityName
52 private final String entityName;
54 private EntityOwnershipCandidateRegistration candidateRegistration = null;
55 private EntityOwnershipListenerRegistration ownershipListenerRegistration = null;
57 private ListenerRegistration<TopologyRoleChangeStrategy> datastoreListenerRegistration;
59 public TopologyRoleChangeStrategy(final DataBroker dataBroker,
60 final EntityOwnershipService entityOwnershipService,
61 final String entityType,
62 final String entityName) {
63 this.dataBroker = dataBroker;
64 this.entityOwnershipService = entityOwnershipService;
65 this.entityType = entityType;
66 this.entityName = entityName;
68 datastoreListenerRegistration = null;
72 public void registerRoleCandidate(NodeListener electionCandidate) {
73 LOG.warn("Registering candidate");
74 ownershipCandidate = electionCandidate;
76 if (candidateRegistration != null) {
77 unregisterRoleCandidate();
79 candidateRegistration = entityOwnershipService.registerCandidate(new Entity(entityType, entityName));
80 ownershipListenerRegistration = entityOwnershipService.registerListener(entityType, this);
81 } catch (CandidateAlreadyRegisteredException e) {
82 LOG.error("Candidate already registered for election", e);
83 throw new IllegalStateException("Candidate already registered for election", e);
88 public void unregisterRoleCandidate() {
89 candidateRegistration.close();
90 candidateRegistration = null;
91 ownershipListenerRegistration.close();
92 ownershipListenerRegistration = null;
96 public void onRoleChanged(RoleChangeDTO roleChangeDTO) {
97 if (roleChangeDTO.isOwner()) {
98 LOG.warn("Gained ownership of entity, registering datastore listener");
100 if (datastoreListenerRegistration == null) {
101 LOG.debug("Listener on path {}", createTopologyId(entityType).child(Node.class).getPathArguments());
102 datastoreListenerRegistration = dataBroker.registerDataTreeChangeListener(
103 new DataTreeIdentifier<>(LogicalDatastoreType.CONFIGURATION, createTopologyId(entityType).child(Node.class)), this);
105 } else if (datastoreListenerRegistration != null) {
106 LOG.warn("No longer owner of entity, unregistering datastore listener");
107 datastoreListenerRegistration.close();
108 datastoreListenerRegistration = null;
110 ownershipCandidate.onRoleChanged(roleChangeDTO);
114 public void ownershipChanged(final EntityOwnershipChange ownershipChange) {
115 onRoleChanged(new RoleChangeDTO(ownershipChange.wasOwner(), ownershipChange.isOwner(), ownershipChange.hasOwner()));
119 public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<Node>> changes) {
120 for (DataTreeModification<Node> change : changes) {
121 final DataObjectModification<Node> rootNode = change.getRootNode();
122 switch (rootNode.getModificationType()) {
124 LOG.debug("Data was Created {}, {}", rootNode.getIdentifier(), rootNode.getDataAfter());
125 ownershipCandidate.onNodeCreated(getNodeId(rootNode.getIdentifier()), rootNode.getDataAfter());
127 case SUBTREE_MODIFIED:
128 LOG.debug("Data was Updated {}, {}", rootNode.getIdentifier(), rootNode.getDataAfter());
129 ownershipCandidate.onNodeUpdated(getNodeId(rootNode.getIdentifier()), rootNode.getDataAfter());
132 LOG.debug("Data was Deleted {}", rootNode.getIdentifier());
133 ownershipCandidate.onNodeDeleted(getNodeId(rootNode.getIdentifier()));
139 * Determines the Netconf Node Node ID, given the node's instance
142 * @param pathArgument Node's path arument
143 * @return NodeId for the node
145 private NodeId getNodeId(final PathArgument pathArgument) {
146 if (pathArgument instanceof InstanceIdentifier.IdentifiableItem<?, ?>) {
148 final Identifier key = ((InstanceIdentifier.IdentifiableItem) pathArgument).getKey();
149 if(key instanceof NodeKey) {
150 return ((NodeKey) key).getNodeId();
153 throw new IllegalStateException("Unable to create NodeId from: " + pathArgument);
156 private static InstanceIdentifier<Topology> createTopologyId(final String topologyId) {
157 final InstanceIdentifier<NetworkTopology> networkTopology = InstanceIdentifier.create(NetworkTopology.class);
158 return networkTopology.child(Topology.class, new TopologyKey(new TopologyId(topologyId)));