2 * Copyright (c) 2015 Brocade Communications 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
8 package org.opendaylight.controller.cluster.datastore.entityownership;
10 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_ID_QNAME;
11 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNERS_PATH;
12 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNER_NODE_ID;
13 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_QNAME;
14 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_TYPE_QNAME;
15 import com.google.common.base.Objects;
16 import com.google.common.base.Optional;
17 import java.util.Collection;
18 import java.util.Map.Entry;
19 import org.opendaylight.controller.cluster.datastore.ShardDataTree;
20 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
21 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.EntityType;
23 import org.opendaylight.yangtools.yang.common.QName;
24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
27 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
28 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
30 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
31 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
32 import org.slf4j.Logger;
33 import org.slf4j.LoggerFactory;
36 * Listens for entity owner changes and notifies the EntityOwnershipListenerSupport appropriately.
38 * @author Thomas Pantelis
40 class EntityOwnerChangeListener implements DOMDataTreeChangeListener {
41 private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
43 private final String localMemberName;
44 private final EntityOwnershipListenerSupport listenerSupport;
46 EntityOwnerChangeListener(String localMemberName, EntityOwnershipListenerSupport listenerSupport) {
47 this.localMemberName = localMemberName;
48 this.listenerSupport = listenerSupport;
51 void init(ShardDataTree shardDataTree) {
52 shardDataTree.registerTreeChangeListener(YangInstanceIdentifier.builder(ENTITY_OWNERS_PATH).
53 node(EntityType.QNAME).node(EntityType.QNAME).node(ENTITY_QNAME).node(ENTITY_QNAME).build(), this);
57 public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
58 for(DataTreeCandidate change: changes) {
59 DataTreeCandidateNode changeRoot = change.getRootNode();
60 MapEntryNode entityNode = (MapEntryNode) changeRoot.getDataAfter().get();
62 LOG.debug("Entity node changed: {}, {}", changeRoot.getModificationType(), change.getRootPath());
64 String newOwner = extractOwner(entityNode);
66 String origOwner = null;
67 Optional<NormalizedNode<?, ?>> dataBefore = changeRoot.getDataBefore();
68 if(dataBefore.isPresent()) {
69 MapEntryNode origEntityNode = (MapEntryNode) changeRoot.getDataBefore().get();
70 origOwner = extractOwner(origEntityNode);
73 LOG.debug("New owner: {}, Original owner: {}", newOwner, origOwner);
75 if(!Objects.equal(origOwner, newOwner)) {
76 boolean isOwner = Objects.equal(localMemberName, newOwner);
77 boolean wasOwner = Objects.equal(localMemberName, origOwner);
78 if(isOwner || wasOwner) {
79 Entity entity = createEntity(change.getRootPath());
81 LOG.debug("Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}",
82 entity, wasOwner, isOwner);
84 listenerSupport.notifyEntityOwnershipListeners(entity, wasOwner, isOwner);
90 private Entity createEntity(YangInstanceIdentifier entityPath) {
91 String entityType = null;
92 YangInstanceIdentifier entityId = null;
93 for(PathArgument pathArg: entityPath.getPathArguments()) {
94 if(pathArg instanceof NodeIdentifierWithPredicates) {
95 NodeIdentifierWithPredicates nodeKey = (NodeIdentifierWithPredicates) pathArg;
96 Entry<QName, Object> key = nodeKey.getKeyValues().entrySet().iterator().next();
97 if(ENTITY_TYPE_QNAME.equals(key.getKey())) {
98 entityType = key.getValue().toString();
99 } else if(ENTITY_ID_QNAME.equals(key.getKey())) {
100 entityId = (YangInstanceIdentifier) key.getValue();
105 return new Entity(entityType, entityId);
108 private String extractOwner(MapEntryNode entityNode) {
109 Optional<DataContainerChild<? extends PathArgument, ?>> ownerNode = entityNode.getChild(ENTITY_OWNER_NODE_ID);
110 return ownerNode.isPresent() ? (String) ownerNode.get().getValue() : null;