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.controller.cluster.datastore.entityownership;
11 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.CANDIDATE_NAME_QNAME;
12 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_ID_QNAME;
13 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNERS_PATH;
14 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_QNAME;
15 import akka.actor.ActorRef;
16 import com.google.common.base.Preconditions;
17 import java.util.ArrayList;
18 import java.util.Collection;
19 import java.util.Collections;
20 import java.util.HashMap;
21 import java.util.LinkedHashSet;
22 import java.util.List;
24 import java.util.Map.Entry;
25 import org.opendaylight.controller.cluster.datastore.ShardDataTree;
26 import org.opendaylight.controller.cluster.datastore.entityownership.messages.CandidateAdded;
27 import org.opendaylight.controller.cluster.datastore.entityownership.messages.CandidateRemoved;
28 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.EntityType;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.entity.type.entity.Candidate;
31 import org.opendaylight.yangtools.yang.common.QName;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
35 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
36 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
42 * Listens for candidate entries added/removed and notifies the EntityOwnershipShard appropriately.
45 * @author Thomas Pantelis
47 class CandidateListChangeListener implements DOMDataTreeChangeListener {
48 private static final Logger LOG = LoggerFactory.getLogger(CandidateListChangeListener.class);
50 private final String logId;
51 private final ActorRef shard;
52 private final Map<YangInstanceIdentifier, Collection<String>> currentCandidates = new HashMap<>();
54 CandidateListChangeListener(ActorRef shard, String logId) {
55 this.shard = Preconditions.checkNotNull(shard, "shard should not be null");
59 void init(ShardDataTree shardDataTree) {
60 shardDataTree.registerTreeChangeListener(YangInstanceIdentifier.builder(ENTITY_OWNERS_PATH).
61 node(EntityType.QNAME).node(EntityType.QNAME).node(ENTITY_QNAME).node(ENTITY_QNAME).
62 node(Candidate.QNAME).node(Candidate.QNAME).build(), this);
66 public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
67 for(DataTreeCandidate change: changes) {
68 DataTreeCandidateNode changeRoot = change.getRootNode();
69 ModificationType type = changeRoot.getModificationType();
71 LOG.debug("{}: Candidate node changed: {}, {}", logId, type, change.getRootPath());
73 NodeIdentifierWithPredicates candidateKey =
74 (NodeIdentifierWithPredicates) change.getRootPath().getLastPathArgument();
75 String candidate = candidateKey.getKeyValues().get(CANDIDATE_NAME_QNAME).toString();
77 YangInstanceIdentifier entityId = extractEntityPath(change.getRootPath());
79 if(type == ModificationType.WRITE || type == ModificationType.APPEARED) {
80 LOG.debug("{}: Candidate {} was added for entity {}", logId, candidate, entityId);
82 Collection<String> currentCandidates = addToCurrentCandidates(entityId, candidate);
83 shard.tell(new CandidateAdded(entityId, candidate, new ArrayList<>(currentCandidates)), shard);
84 } else if(type == ModificationType.DELETE || type == ModificationType.DISAPPEARED) {
85 LOG.debug("{}: Candidate {} was removed for entity {}", logId, candidate, entityId);
87 Collection<String> currentCandidates = removeFromCurrentCandidates(entityId, candidate);
88 shard.tell(new CandidateRemoved(entityId, candidate, new ArrayList<>(currentCandidates)), shard);
93 private Collection<String> addToCurrentCandidates(YangInstanceIdentifier entityId, String newCandidate) {
94 Collection<String> candidates = currentCandidates.get(entityId);
95 if(candidates == null) {
96 candidates = new LinkedHashSet<>();
97 currentCandidates.put(entityId, candidates);
100 candidates.add(newCandidate);
104 private Collection<String> removeFromCurrentCandidates(YangInstanceIdentifier entityId, String candidateToRemove) {
105 Collection<String> candidates = currentCandidates.get(entityId);
106 if(candidates != null) {
107 candidates.remove(candidateToRemove);
112 return Collections.emptyList();
115 private YangInstanceIdentifier extractEntityPath(YangInstanceIdentifier candidatePath) {
116 List<PathArgument> newPathArgs = new ArrayList<>();
117 for(PathArgument pathArg: candidatePath.getPathArguments()) {
118 newPathArgs.add(pathArg);
119 if(pathArg instanceof NodeIdentifierWithPredicates) {
120 NodeIdentifierWithPredicates nodeKey = (NodeIdentifierWithPredicates) pathArg;
121 Entry<QName, Object> key = nodeKey.getKeyValues().entrySet().iterator().next();
122 if(ENTITY_ID_QNAME.equals(key.getKey())) {
128 return YangInstanceIdentifier.create(newPathArgs);