Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2015-present Open Networking Foundation |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [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 | */ |
Thomas Vachuska | c97aa61 | 2015-06-23 16:00:18 -0700 | [diff] [blame] | 16 | package org.onosproject.store.trivial; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 17 | |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 18 | import static org.onosproject.mastership.MastershipEvent.Type.BACKUPS_CHANGED; |
| 19 | import static org.onosproject.mastership.MastershipEvent.Type.MASTER_CHANGED; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 20 | import static org.slf4j.LoggerFactory.getLogger; |
| 21 | |
Yuta HIGUCHI | 0c47d53 | 2017-08-18 23:16:35 -0700 | [diff] [blame] | 22 | import java.time.Instant; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 23 | import java.util.ArrayList; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 24 | import java.util.Collections; |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 25 | import java.util.HashMap; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 26 | import java.util.HashSet; |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 27 | import java.util.List; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 28 | import java.util.Map; |
Thomas Vachuska | a68be81 | 2014-11-27 11:49:54 -0800 | [diff] [blame] | 29 | import java.util.Objects; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 30 | import java.util.Set; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 31 | import java.util.concurrent.CompletableFuture; |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 32 | import java.util.concurrent.atomic.AtomicInteger; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 33 | |
| 34 | import org.apache.felix.scr.annotations.Activate; |
| 35 | import org.apache.felix.scr.annotations.Component; |
| 36 | import org.apache.felix.scr.annotations.Deactivate; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 37 | import org.apache.felix.scr.annotations.Reference; |
| 38 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 39 | import org.apache.felix.scr.annotations.Service; |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 40 | import org.onlab.packet.IpAddress; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 41 | import org.onosproject.cluster.ClusterEventListener; |
| 42 | import org.onosproject.cluster.ClusterService; |
| 43 | import org.onosproject.cluster.ControllerNode; |
| 44 | import org.onosproject.cluster.ControllerNode.State; |
| 45 | import org.onosproject.cluster.DefaultControllerNode; |
| 46 | import org.onosproject.cluster.NodeId; |
| 47 | import org.onosproject.cluster.RoleInfo; |
Jordan Halterman | f70bf46 | 2017-07-29 13:12:00 -0700 | [diff] [blame] | 48 | import org.onosproject.core.Version; |
| 49 | import org.onosproject.core.VersionService; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 50 | import org.onosproject.mastership.MastershipEvent; |
| 51 | import org.onosproject.mastership.MastershipStore; |
| 52 | import org.onosproject.mastership.MastershipStoreDelegate; |
| 53 | import org.onosproject.mastership.MastershipTerm; |
| 54 | import org.onosproject.net.DeviceId; |
| 55 | import org.onosproject.net.MastershipRole; |
| 56 | import org.onosproject.store.AbstractStore; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 57 | import org.slf4j.Logger; |
| 58 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 59 | import com.google.common.collect.ImmutableList; |
| 60 | import com.google.common.collect.ImmutableSet; |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 61 | |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 62 | /** |
| 63 | * Manages inventory of controller mastership over devices using |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 64 | * trivial, non-distributed in-memory structures implementation. |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 65 | */ |
| 66 | @Component(immediate = true) |
| 67 | @Service |
tom | f80c972 | 2014-09-24 14:49:18 -0700 | [diff] [blame] | 68 | public class SimpleMastershipStore |
| 69 | extends AbstractStore<MastershipEvent, MastershipStoreDelegate> |
| 70 | implements MastershipStore { |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 71 | |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 72 | private final Logger log = getLogger(getClass()); |
| 73 | |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 74 | private static final int NOTHING = 0; |
| 75 | private static final int INIT = 1; |
| 76 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 77 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 78 | protected ClusterService clusterService; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 79 | |
Jordan Halterman | f70bf46 | 2017-07-29 13:12:00 -0700 | [diff] [blame] | 80 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 81 | protected VersionService versionService; |
| 82 | |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 83 | //devices mapped to their masters, to emulate multiple nodes |
Ayaka Koshibe | 3de43ca | 2014-09-26 16:40:23 -0700 | [diff] [blame] | 84 | protected final Map<DeviceId, NodeId> masterMap = new HashMap<>(); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 85 | //emulate backups with pile of nodes |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 86 | protected final Map<DeviceId, List<NodeId>> backups = new HashMap<>(); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 87 | //terms |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 88 | protected final Map<DeviceId, AtomicInteger> termMap = new HashMap<>(); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 89 | |
| 90 | @Activate |
| 91 | public void activate() { |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 92 | if (clusterService == null) { |
| 93 | // just for ease of unit test |
| 94 | final ControllerNode instance = |
| 95 | new DefaultControllerNode(new NodeId("local"), |
| 96 | IpAddress.valueOf("127.0.0.1")); |
| 97 | |
| 98 | clusterService = new ClusterService() { |
| 99 | |
Yuta HIGUCHI | 0c47d53 | 2017-08-18 23:16:35 -0700 | [diff] [blame] | 100 | private final Instant creationTime = Instant.now(); |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 101 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 102 | @Override |
| 103 | public ControllerNode getLocalNode() { |
| 104 | return instance; |
| 105 | } |
| 106 | |
| 107 | @Override |
| 108 | public Set<ControllerNode> getNodes() { |
| 109 | return ImmutableSet.of(instance); |
| 110 | } |
| 111 | |
| 112 | @Override |
| 113 | public ControllerNode getNode(NodeId nodeId) { |
| 114 | if (instance.id().equals(nodeId)) { |
| 115 | return instance; |
| 116 | } |
| 117 | return null; |
| 118 | } |
| 119 | |
| 120 | @Override |
| 121 | public State getState(NodeId nodeId) { |
| 122 | if (instance.id().equals(nodeId)) { |
| 123 | return State.ACTIVE; |
| 124 | } else { |
| 125 | return State.INACTIVE; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | @Override |
Jordan Halterman | f70bf46 | 2017-07-29 13:12:00 -0700 | [diff] [blame] | 130 | public Version getVersion(NodeId nodeId) { |
| 131 | if (instance.id().equals(nodeId)) { |
| 132 | return versionService.version(); |
| 133 | } |
| 134 | return null; |
| 135 | } |
| 136 | |
| 137 | @Override |
Yuta HIGUCHI | 0c47d53 | 2017-08-18 23:16:35 -0700 | [diff] [blame] | 138 | public Instant getLastUpdatedInstant(NodeId nodeId) { |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 139 | return creationTime; |
| 140 | } |
| 141 | |
| 142 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 143 | public void addListener(ClusterEventListener listener) { |
| 144 | } |
| 145 | |
| 146 | @Override |
| 147 | public void removeListener(ClusterEventListener listener) { |
| 148 | } |
| 149 | }; |
| 150 | } |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 151 | log.info("Started"); |
| 152 | } |
| 153 | |
| 154 | @Deactivate |
| 155 | public void deactivate() { |
| 156 | log.info("Stopped"); |
| 157 | } |
| 158 | |
| 159 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 160 | public synchronized CompletableFuture<MastershipEvent> setMaster(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 161 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 162 | MastershipRole role = getRole(nodeId, deviceId); |
| 163 | switch (role) { |
| 164 | case MASTER: |
| 165 | // no-op |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 166 | return CompletableFuture.completedFuture(null); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 167 | case STANDBY: |
| 168 | case NONE: |
| 169 | NodeId prevMaster = masterMap.put(deviceId, nodeId); |
| 170 | incrementTerm(deviceId); |
| 171 | removeFromBackups(deviceId, nodeId); |
| 172 | addToBackup(deviceId, prevMaster); |
| 173 | break; |
| 174 | default: |
| 175 | log.warn("unknown Mastership Role {}", role); |
| 176 | return null; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 177 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 178 | |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 179 | return CompletableFuture.completedFuture( |
| 180 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 184 | public NodeId getMaster(DeviceId deviceId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 185 | return masterMap.get(deviceId); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 188 | // synchronized for atomic read |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 189 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 190 | public synchronized RoleInfo getNodes(DeviceId deviceId) { |
| 191 | return new RoleInfo(masterMap.get(deviceId), |
| 192 | backups.getOrDefault(deviceId, ImmutableList.of())); |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 196 | public Set<DeviceId> getDevices(NodeId nodeId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 197 | Set<DeviceId> ids = new HashSet<>(); |
| 198 | for (Map.Entry<DeviceId, NodeId> d : masterMap.entrySet()) { |
Thomas Vachuska | a68be81 | 2014-11-27 11:49:54 -0800 | [diff] [blame] | 199 | if (Objects.equals(d.getValue(), nodeId)) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 200 | ids.add(d.getKey()); |
| 201 | } |
| 202 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 203 | return ids; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | @Override |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 207 | public synchronized CompletableFuture<MastershipRole> requestRole(DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 208 | //query+possible reelection |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 209 | NodeId node = clusterService.getLocalNode().id(); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 210 | MastershipRole role = getRole(node, deviceId); |
| 211 | |
| 212 | switch (role) { |
| 213 | case MASTER: |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 214 | return CompletableFuture.completedFuture(MastershipRole.MASTER); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 215 | case STANDBY: |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 216 | if (getMaster(deviceId) == null) { |
| 217 | // no master => become master |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 218 | masterMap.put(deviceId, node); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 219 | incrementTerm(deviceId); |
| 220 | // remove from backup list |
| 221 | removeFromBackups(deviceId, node); |
| 222 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, |
| 223 | getNodes(deviceId))); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 224 | return CompletableFuture.completedFuture(MastershipRole.MASTER); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 225 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 226 | return CompletableFuture.completedFuture(MastershipRole.STANDBY); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 227 | case NONE: |
| 228 | if (getMaster(deviceId) == null) { |
| 229 | // no master => become master |
| 230 | masterMap.put(deviceId, node); |
| 231 | incrementTerm(deviceId); |
| 232 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, |
| 233 | getNodes(deviceId))); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 234 | return CompletableFuture.completedFuture(MastershipRole.MASTER); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 235 | } |
| 236 | // add to backup list |
| 237 | if (addToBackup(deviceId, node)) { |
| 238 | notifyDelegate(new MastershipEvent(BACKUPS_CHANGED, deviceId, |
| 239 | getNodes(deviceId))); |
| 240 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 241 | return CompletableFuture.completedFuture(MastershipRole.STANDBY); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 242 | default: |
| 243 | log.warn("unknown Mastership Role {}", role); |
| 244 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 245 | return CompletableFuture.completedFuture(role); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 246 | } |
| 247 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 248 | // add to backup if not there already, silently ignores null node |
| 249 | private synchronized boolean addToBackup(DeviceId deviceId, NodeId nodeId) { |
| 250 | boolean modified = false; |
| 251 | List<NodeId> stbys = backups.getOrDefault(deviceId, new ArrayList<>()); |
| 252 | if (nodeId != null && !stbys.contains(nodeId)) { |
| 253 | stbys.add(nodeId); |
| 254 | modified = true; |
| 255 | } |
| 256 | backups.put(deviceId, stbys); |
| 257 | return modified; |
| 258 | } |
| 259 | |
| 260 | private synchronized boolean removeFromBackups(DeviceId deviceId, NodeId node) { |
| 261 | List<NodeId> stbys = backups.getOrDefault(deviceId, new ArrayList<>()); |
| 262 | boolean modified = stbys.remove(node); |
| 263 | backups.put(deviceId, stbys); |
| 264 | return modified; |
| 265 | } |
| 266 | |
| 267 | private synchronized void incrementTerm(DeviceId deviceId) { |
| 268 | AtomicInteger term = termMap.getOrDefault(deviceId, new AtomicInteger(NOTHING)); |
| 269 | term.incrementAndGet(); |
| 270 | termMap.put(deviceId, term); |
| 271 | } |
| 272 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 273 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 274 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 275 | //just query |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 276 | NodeId current = masterMap.get(deviceId); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 277 | MastershipRole role; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 278 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 279 | if (current != null && current.equals(nodeId)) { |
| 280 | return MastershipRole.MASTER; |
| 281 | } |
| 282 | |
| 283 | if (backups.getOrDefault(deviceId, Collections.emptyList()).contains(nodeId)) { |
| 284 | role = MastershipRole.STANDBY; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 285 | } else { |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 286 | role = MastershipRole.NONE; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 287 | } |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 288 | return role; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 289 | } |
| 290 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 291 | // synchronized for atomic read |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 292 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 293 | public synchronized MastershipTerm getTermFor(DeviceId deviceId) { |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 294 | if ((termMap.get(deviceId) == null)) { |
| 295 | return MastershipTerm.of(masterMap.get(deviceId), NOTHING); |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 296 | } |
| 297 | return MastershipTerm.of( |
| 298 | masterMap.get(deviceId), termMap.get(deviceId).get()); |
| 299 | } |
| 300 | |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 301 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 302 | public synchronized CompletableFuture<MastershipEvent> setStandby(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 303 | MastershipRole role = getRole(nodeId, deviceId); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 304 | switch (role) { |
| 305 | case MASTER: |
| 306 | NodeId backup = reelect(deviceId, nodeId); |
| 307 | if (backup == null) { |
| 308 | // no master alternative |
| 309 | masterMap.remove(deviceId); |
| 310 | // TODO: Should there be new event type for no MASTER? |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 311 | return CompletableFuture.completedFuture( |
| 312 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 313 | } else { |
| 314 | NodeId prevMaster = masterMap.put(deviceId, backup); |
| 315 | incrementTerm(deviceId); |
| 316 | addToBackup(deviceId, prevMaster); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 317 | return CompletableFuture.completedFuture( |
| 318 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 319 | } |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 320 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 321 | case STANDBY: |
| 322 | case NONE: |
| 323 | boolean modified = addToBackup(deviceId, nodeId); |
| 324 | if (modified) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 325 | return CompletableFuture.completedFuture( |
| 326 | new MastershipEvent(BACKUPS_CHANGED, deviceId, getNodes(deviceId))); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 327 | } |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 328 | break; |
| 329 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 330 | default: |
| 331 | log.warn("unknown Mastership Role {}", role); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 332 | } |
| 333 | return null; |
| 334 | } |
| 335 | |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 336 | //dumbly selects next-available node that's not the current one |
| 337 | //emulate leader election |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 338 | private synchronized NodeId reelect(DeviceId did, NodeId nodeId) { |
| 339 | List<NodeId> stbys = backups.getOrDefault(did, Collections.emptyList()); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 340 | NodeId backup = null; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 341 | for (NodeId n : stbys) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 342 | if (!n.equals(nodeId)) { |
| 343 | backup = n; |
| 344 | break; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 345 | } |
| 346 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 347 | stbys.remove(backup); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 348 | return backup; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 349 | } |
| 350 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 351 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 352 | public synchronized CompletableFuture<MastershipEvent> relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 353 | MastershipRole role = getRole(nodeId, deviceId); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 354 | switch (role) { |
| 355 | case MASTER: |
| 356 | NodeId backup = reelect(deviceId, nodeId); |
| 357 | masterMap.put(deviceId, backup); |
| 358 | incrementTerm(deviceId); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 359 | return CompletableFuture.completedFuture( |
| 360 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 361 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 362 | case STANDBY: |
| 363 | if (removeFromBackups(deviceId, nodeId)) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 364 | return CompletableFuture.completedFuture( |
| 365 | new MastershipEvent(BACKUPS_CHANGED, deviceId, getNodes(deviceId))); |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 366 | } |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 367 | break; |
| 368 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 369 | case NONE: |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 370 | break; |
| 371 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 372 | default: |
| 373 | log.warn("unknown Mastership Role {}", role); |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 374 | } |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 375 | return CompletableFuture.completedFuture(null); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 376 | } |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 377 | |
| 378 | @Override |
| 379 | public synchronized void relinquishAllRole(NodeId nodeId) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 380 | List<CompletableFuture<MastershipEvent>> eventFutures = new ArrayList<>(); |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 381 | Set<DeviceId> toRelinquish = new HashSet<>(); |
| 382 | |
| 383 | masterMap.entrySet().stream() |
| 384 | .filter(entry -> nodeId.equals(entry.getValue())) |
| 385 | .forEach(entry -> toRelinquish.add(entry.getKey())); |
| 386 | |
| 387 | backups.entrySet().stream() |
| 388 | .filter(entry -> entry.getValue().contains(nodeId)) |
| 389 | .forEach(entry -> toRelinquish.add(entry.getKey())); |
| 390 | |
Sho SHIMIZU | feafdca | 2015-09-11 15:02:21 -0700 | [diff] [blame] | 391 | toRelinquish.forEach(deviceId -> eventFutures.add(relinquishRole(nodeId, deviceId))); |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 392 | |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 393 | eventFutures.forEach(future -> { |
Sho SHIMIZU | feafdca | 2015-09-11 15:02:21 -0700 | [diff] [blame] | 394 | future.whenComplete((event, error) -> notifyDelegate(event)); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 395 | }); |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 396 | } |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 397 | } |