Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2016-present Open Networking Foundation |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.store.cluster.impl; |
| 17 | |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 18 | import java.util.Dictionary; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 19 | import java.util.Map; |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 20 | import java.util.Objects; |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 21 | import java.util.concurrent.ExecutorService; |
| 22 | import java.util.concurrent.Executors; |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 23 | import java.util.function.Consumer; |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 24 | import java.util.stream.Collectors; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 25 | |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 26 | import com.google.common.collect.Maps; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 27 | import org.apache.felix.scr.annotations.Activate; |
| 28 | import org.apache.felix.scr.annotations.Component; |
| 29 | import org.apache.felix.scr.annotations.Deactivate; |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 30 | import org.apache.felix.scr.annotations.Modified; |
| 31 | import org.apache.felix.scr.annotations.Property; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 32 | import org.apache.felix.scr.annotations.Reference; |
| 33 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 34 | import org.apache.felix.scr.annotations.Service; |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 35 | import org.onosproject.cfg.ComponentConfigService; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 36 | import org.onosproject.cluster.ClusterService; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 37 | import org.onosproject.cluster.Leadership; |
| 38 | import org.onosproject.cluster.LeadershipEvent; |
| 39 | import org.onosproject.cluster.LeadershipStore; |
| 40 | import org.onosproject.cluster.LeadershipStoreDelegate; |
| 41 | import org.onosproject.cluster.NodeId; |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 42 | import org.onosproject.core.Version; |
| 43 | import org.onosproject.core.VersionService; |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 44 | import org.onosproject.event.Change; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 45 | import org.onosproject.store.AbstractStore; |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 46 | import org.onosproject.store.service.DistributedPrimitive.Status; |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 47 | import org.onosproject.store.service.CoordinationService; |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 48 | import org.onosproject.store.service.LeaderElector; |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 49 | import org.onosproject.upgrade.UpgradeEvent; |
| 50 | import org.onosproject.upgrade.UpgradeEventListener; |
| 51 | import org.onosproject.upgrade.UpgradeService; |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 52 | import org.osgi.service.component.ComponentContext; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 53 | import org.slf4j.Logger; |
| 54 | |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 55 | import static com.google.common.base.Strings.isNullOrEmpty; |
| 56 | import static org.apache.felix.scr.annotations.ReferenceCardinality.MANDATORY_UNARY; |
| 57 | import static org.onlab.util.Tools.get; |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 58 | import static org.onlab.util.Tools.groupedThreads; |
| 59 | import static org.slf4j.LoggerFactory.getLogger; |
| 60 | |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 61 | /** |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 62 | * Implementation of {@code LeadershipStore} that makes use of a {@link LeaderElector} |
| 63 | * primitive. |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 64 | */ |
| 65 | @Service |
Sho SHIMIZU | 5c396e3 | 2016-08-12 15:19:12 -0700 | [diff] [blame] | 66 | @Component(immediate = true) |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 67 | public class DistributedLeadershipStore |
| 68 | extends AbstractStore<LeadershipEvent, LeadershipStoreDelegate> |
| 69 | implements LeadershipStore { |
| 70 | |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 71 | private static final char VERSION_SEP = '|'; |
| 72 | |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 73 | private final Logger log = getLogger(getClass()); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 74 | |
| 75 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 76 | protected ClusterService clusterService; |
| 77 | |
| 78 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 79 | protected CoordinationService storageService; |
| 80 | |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 81 | @Reference(cardinality = MANDATORY_UNARY) |
| 82 | protected ComponentConfigService configService; |
| 83 | |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 84 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 85 | protected VersionService versionService; |
| 86 | |
| 87 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 88 | protected UpgradeService upgradeService; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 89 | |
Jordan Halterman | 19486e3 | 2017-11-02 15:00:06 -0700 | [diff] [blame] | 90 | private static final long DEFAULT_ELECTION_TIMEOUT_MILLIS = 250; |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 91 | @Property(name = "electionTimeoutMillis", longValue = DEFAULT_ELECTION_TIMEOUT_MILLIS, |
| 92 | label = "the leader election timeout in milliseconds") |
| 93 | private long electionTimeoutMillis = DEFAULT_ELECTION_TIMEOUT_MILLIS; |
| 94 | |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 95 | private ExecutorService statusChangeHandler; |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 96 | private NodeId localNodeId; |
| 97 | private LeaderElector leaderElector; |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 98 | private final Map<String, Leadership> localLeaderCache = Maps.newConcurrentMap(); |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 99 | private final UpgradeEventListener upgradeListener = new InternalUpgradeEventListener(); |
Madan Jampani | 72282af | 2016-02-23 14:23:52 -0800 | [diff] [blame] | 100 | |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 101 | private final Consumer<Change<Leadership>> leadershipChangeListener = |
| 102 | change -> { |
| 103 | Leadership oldValue = change.oldValue(); |
| 104 | Leadership newValue = change.newValue(); |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 105 | |
| 106 | // If the topic is not relevant to this version, skip the event. |
| 107 | if (!isLocalTopic(newValue.topic())) { |
| 108 | return; |
| 109 | } |
| 110 | |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 111 | boolean leaderChanged = !Objects.equals(oldValue.leader(), newValue.leader()); |
| 112 | boolean candidatesChanged = !Objects.equals(oldValue.candidates(), newValue.candidates()); |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 113 | |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 114 | LeadershipEvent.Type eventType = null; |
| 115 | if (leaderChanged && candidatesChanged) { |
| 116 | eventType = LeadershipEvent.Type.LEADER_AND_CANDIDATES_CHANGED; |
| 117 | } |
| 118 | if (leaderChanged && !candidatesChanged) { |
| 119 | eventType = LeadershipEvent.Type.LEADER_CHANGED; |
| 120 | } |
| 121 | if (!leaderChanged && candidatesChanged) { |
| 122 | eventType = LeadershipEvent.Type.CANDIDATES_CHANGED; |
| 123 | } |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 124 | notifyDelegate(new LeadershipEvent(eventType, new Leadership( |
| 125 | parseTopic(change.newValue().topic()), |
| 126 | change.newValue().leader(), |
| 127 | change.newValue().candidates()))); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 128 | // Update local cache of currently held leaderships |
| 129 | if (Objects.equals(newValue.leaderNodeId(), localNodeId)) { |
| 130 | localLeaderCache.put(newValue.topic(), newValue); |
| 131 | } else { |
| 132 | localLeaderCache.remove(newValue.topic()); |
| 133 | } |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 134 | }; |
| 135 | |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 136 | private final Consumer<Status> clientStatusListener = status -> |
| 137 | statusChangeHandler.execute(() -> handleStatusChange(status)); |
| 138 | |
| 139 | private void handleStatusChange(Status status) { |
| 140 | // Notify mastership Service of disconnect and reconnect |
| 141 | if (status == Status.ACTIVE) { |
| 142 | // Service Restored |
| 143 | localLeaderCache.forEach((topic, leadership) -> leaderElector.run(topic, localNodeId)); |
| 144 | leaderElector.getLeaderships().forEach((topic, leadership) -> |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 145 | notifyDelegate(new LeadershipEvent( |
| 146 | LeadershipEvent.Type.SERVICE_RESTORED, |
| 147 | new Leadership( |
| 148 | parseTopic(leadership.topic()), |
| 149 | leadership.leader(), |
| 150 | leadership.candidates())))); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 151 | } else if (status == Status.SUSPENDED) { |
| 152 | // Service Suspended |
| 153 | localLeaderCache.forEach((topic, leadership) -> |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 154 | notifyDelegate(new LeadershipEvent( |
| 155 | LeadershipEvent.Type.SERVICE_DISRUPTED, |
| 156 | new Leadership( |
| 157 | parseTopic(leadership.topic()), |
| 158 | leadership.leader(), |
| 159 | leadership.candidates())))); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 160 | } else { |
| 161 | // Should be only inactive state |
| 162 | return; |
| 163 | } |
| 164 | } |
| 165 | |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 166 | @Activate |
| 167 | public void activate() { |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 168 | configService.registerProperties(getClass()); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 169 | statusChangeHandler = Executors.newSingleThreadExecutor( |
| 170 | groupedThreads("onos/store/dist/cluster/leadership", "status-change-handler", log)); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 171 | localNodeId = clusterService.getLocalNode().id(); |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 172 | leaderElector = storageService.leaderElectorBuilder() |
Jordan Halterman | 46c5eaa | 2018-01-24 16:46:55 -0800 | [diff] [blame] | 173 | .withName("onos-leadership-elections") |
| 174 | .withElectionTimeout(electionTimeoutMillis) |
| 175 | .withRelaxedReadConsistency() |
| 176 | .build() |
| 177 | .asLeaderElector(); |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 178 | leaderElector.addChangeListener(leadershipChangeListener); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 179 | leaderElector.addStatusChangeListener(clientStatusListener); |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 180 | upgradeService.addListener(upgradeListener); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 181 | log.info("Started"); |
| 182 | } |
| 183 | |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 184 | @Modified |
| 185 | public void modified(ComponentContext context) { |
| 186 | if (context == null) { |
| 187 | return; |
| 188 | } |
| 189 | |
| 190 | Dictionary<?, ?> properties = context.getProperties(); |
| 191 | long newElectionTimeoutMillis; |
| 192 | try { |
| 193 | String s = get(properties, "electionTimeoutMillis"); |
| 194 | newElectionTimeoutMillis = isNullOrEmpty(s) ? electionTimeoutMillis : Long.parseLong(s.trim()); |
| 195 | } catch (NumberFormatException | ClassCastException e) { |
| 196 | log.warn("Malformed configuration detected; using defaults", e); |
| 197 | newElectionTimeoutMillis = DEFAULT_ELECTION_TIMEOUT_MILLIS; |
| 198 | } |
| 199 | |
| 200 | if (newElectionTimeoutMillis != electionTimeoutMillis) { |
| 201 | electionTimeoutMillis = newElectionTimeoutMillis; |
| 202 | leaderElector = storageService.leaderElectorBuilder() |
| 203 | .withName("onos-leadership-elections") |
| 204 | .withElectionTimeout(electionTimeoutMillis) |
Jordan Halterman | e74e629 | 2018-05-15 00:52:31 -0700 | [diff] [blame^] | 205 | .withRelaxedReadConsistency() |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 206 | .build() |
| 207 | .asLeaderElector(); |
| 208 | } |
| 209 | } |
| 210 | |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 211 | @Deactivate |
| 212 | public void deactivate() { |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 213 | leaderElector.removeChangeListener(leadershipChangeListener); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 214 | leaderElector.removeStatusChangeListener(clientStatusListener); |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 215 | upgradeService.removeListener(upgradeListener); |
Jon Hall | 7a8bfc6 | 2016-05-26 17:59:04 -0700 | [diff] [blame] | 216 | statusChangeHandler.shutdown(); |
Jordan Halterman | 1f2e804 | 2017-10-18 16:38:03 -0700 | [diff] [blame] | 217 | configService.unregisterProperties(getClass(), false); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 218 | log.info("Stopped"); |
| 219 | } |
| 220 | |
| 221 | @Override |
| 222 | public Leadership addRegistration(String topic) { |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 223 | leaderElector.run(getLocalTopic(topic), localNodeId); |
| 224 | return getLeadership(topic); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | @Override |
| 228 | public void removeRegistration(String topic) { |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 229 | leaderElector.withdraw(getLocalTopic(topic)); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | @Override |
| 233 | public void removeRegistration(NodeId nodeId) { |
Madan Jampani | 78be249 | 2016-06-03 23:27:07 -0700 | [diff] [blame] | 234 | leaderElector.evict(nodeId); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | @Override |
| 238 | public boolean moveLeadership(String topic, NodeId toNodeId) { |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 239 | return leaderElector.anoint(getTopicFor(topic, toNodeId), toNodeId); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | @Override |
| 243 | public boolean makeTopCandidate(String topic, NodeId nodeId) { |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 244 | return leaderElector.promote(getTopicFor(topic, nodeId), nodeId); |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | @Override |
| 248 | public Leadership getLeadership(String topic) { |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 249 | Leadership leadership = leaderElector.getLeadership(getActiveTopic(topic)); |
| 250 | return leadership != null ? new Leadership( |
| 251 | parseTopic(leadership.topic()), |
| 252 | leadership.leader(), |
| 253 | leadership.candidates()) : null; |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | @Override |
| 257 | public Map<String, Leadership> getLeaderships() { |
Jordan Halterman | 980a8c1 | 2017-09-22 18:01:19 -0700 | [diff] [blame] | 258 | Map<String, Leadership> leaderships = leaderElector.getLeaderships(); |
| 259 | return leaderships.entrySet().stream() |
| 260 | .filter(e -> isActiveTopic(e.getKey())) |
| 261 | .collect(Collectors.toMap(e -> parseTopic(e.getKey()), |
| 262 | e -> new Leadership(parseTopic(e.getKey()), e.getValue().leader(), e.getValue().candidates()))); |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | * Returns a leader elector topic namespaced with the local node's version. |
| 267 | * |
| 268 | * @param topic the base topic |
| 269 | * @return a topic string namespaced with the local node's version |
| 270 | */ |
| 271 | private String getLocalTopic(String topic) { |
| 272 | return topic + VERSION_SEP + versionService.version(); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Returns a leader elector topic namespaced with the current cluster version. |
| 277 | * |
| 278 | * @param topic the base topic |
| 279 | * @return a topic string namespaced with the current cluster version |
| 280 | */ |
| 281 | private String getActiveTopic(String topic) { |
| 282 | return topic + VERSION_SEP + upgradeService.getVersion(); |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * Returns whether the given topic is a topic for the local version. |
| 287 | * |
| 288 | * @param topic the topic to check |
| 289 | * @return whether the given topic is relevant to the local version |
| 290 | */ |
| 291 | private boolean isLocalTopic(String topic) { |
| 292 | return topic.endsWith(versionService.version().toString()); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Returns whether the given topic is a topic for the current cluster version. |
| 297 | * |
| 298 | * @param topic the topic to check |
| 299 | * @return whether the given topic is relevant to the current cluster version |
| 300 | */ |
| 301 | private boolean isActiveTopic(String topic) { |
| 302 | return topic.endsWith(VERSION_SEP + upgradeService.getVersion().toString()); |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Parses a topic string, returning the base topic. |
| 307 | * |
| 308 | * @param topic the topic string to parse |
| 309 | * @return the base topic string |
| 310 | */ |
| 311 | private String parseTopic(String topic) { |
| 312 | return topic.substring(0, topic.lastIndexOf(VERSION_SEP)); |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Returns the versioned topic for the given node. |
| 317 | * |
| 318 | * @param topic the topic for the given node |
| 319 | * @param nodeId the node for which to return the namespaced topic |
| 320 | * @return the versioned topic for the given node |
| 321 | */ |
| 322 | private String getTopicFor(String topic, NodeId nodeId) { |
| 323 | Version nodeVersion = clusterService.getVersion(nodeId); |
| 324 | return nodeVersion != null ? topic + VERSION_SEP + nodeVersion : topic + VERSION_SEP + versionService.version(); |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * Internal upgrade event listener. |
| 329 | */ |
| 330 | private class InternalUpgradeEventListener implements UpgradeEventListener { |
| 331 | @Override |
| 332 | public void event(UpgradeEvent event) { |
| 333 | if (event.type() == UpgradeEvent.Type.UPGRADED || event.type() == UpgradeEvent.Type.ROLLED_BACK) { |
| 334 | // Iterate through all current leaderships for the new version and trigger events. |
| 335 | for (Leadership leadership : getLeaderships().values()) { |
| 336 | notifyDelegate(new LeadershipEvent( |
| 337 | LeadershipEvent.Type.LEADER_AND_CANDIDATES_CHANGED, |
| 338 | leadership)); |
| 339 | } |
| 340 | } |
| 341 | } |
Madan Jampani | 620f70d | 2016-01-30 22:22:47 -0800 | [diff] [blame] | 342 | } |
| 343 | } |