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 public class CandidateListChangeListener implements DOMDataTreeChangeListener {
48 private static final Logger LOG = LoggerFactory.getLogger(CandidateListChangeListener.class);
50 private final ActorRef shard;
51 private final Map<YangInstanceIdentifier, Collection<String>> currentCandidates = new HashMap<>();
53 public CandidateListChangeListener(ActorRef shard, ShardDataTree shardDataTree) {
54 this.shard = Preconditions.checkNotNull(shard, "shard should not be null");
56 shardDataTree.registerTreeChangeListener(YangInstanceIdentifier.builder(ENTITY_OWNERS_PATH).
57 node(EntityType.QNAME).node(EntityType.QNAME).node(ENTITY_QNAME).node(ENTITY_QNAME).
58 node(Candidate.QNAME).node(Candidate.QNAME).build(), this);
62 public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
63 for(DataTreeCandidate change: changes) {
64 DataTreeCandidateNode changeRoot = change.getRootNode();
66 LOG.debug("Candidate node changed: {}, {}", changeRoot.getModificationType(), change.getRootPath());
68 NodeIdentifierWithPredicates candidateKey =
69 (NodeIdentifierWithPredicates) change.getRootPath().getLastPathArgument();
70 String candidate = candidateKey.getKeyValues().get(CANDIDATE_NAME_QNAME).toString();
72 YangInstanceIdentifier entityId = extractEntityPath(change.getRootPath());
74 if(changeRoot.getModificationType() == ModificationType.WRITE) {
75 LOG.debug("Candidate {} was added for entity {}", candidate, entityId);
77 Collection<String> currentCandidates = addToCurrentCandidates(entityId, candidate);
78 shard.tell(new CandidateAdded(entityId, candidate, new ArrayList<>(currentCandidates)), shard);
79 } else if(changeRoot.getModificationType() == ModificationType.DELETE) {
80 LOG.debug("Candidate {} was removed for entity {}", candidate, entityId);
82 Collection<String> currentCandidates = removeFromCurrentCandidates(entityId, candidate);
83 shard.tell(new CandidateRemoved(entityId, candidate, new ArrayList<>(currentCandidates)), shard);
88 private Collection<String> addToCurrentCandidates(YangInstanceIdentifier entityId, String newCandidate) {
89 Collection<String> candidates = currentCandidates.get(entityId);
90 if(candidates == null) {
91 candidates = new LinkedHashSet<>();
92 currentCandidates.put(entityId, candidates);
95 candidates.add(newCandidate);
99 private Collection<String> removeFromCurrentCandidates(YangInstanceIdentifier entityId, String candidateToRemove) {
100 Collection<String> candidates = currentCandidates.get(entityId);
101 if(candidates != null) {
102 candidates.remove(candidateToRemove);
107 return Collections.emptyList();
110 private YangInstanceIdentifier extractEntityPath(YangInstanceIdentifier candidatePath) {
111 List<PathArgument> newPathArgs = new ArrayList<>();
112 for(PathArgument pathArg: candidatePath.getPathArguments()) {
113 newPathArgs.add(pathArg);
114 if(pathArg instanceof NodeIdentifierWithPredicates) {
115 NodeIdentifierWithPredicates nodeKey = (NodeIdentifierWithPredicates) pathArg;
116 Entry<QName, Object> key = nodeKey.getKeyValues().entrySet().iterator().next();
117 if(ENTITY_ID_QNAME.equals(key.getKey())) {
123 return YangInstanceIdentifier.create(newPathArgs);