Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Open Networking Laboratory |
| 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 | */ |
tom | ea961ff | 2014-10-01 12:45:15 -0700 | [diff] [blame] | 16 | package org.onlab.onos.store.trivial.impl; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 17 | |
| 18 | import static org.slf4j.LoggerFactory.getLogger; |
| 19 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 20 | import java.util.ArrayList; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 21 | import java.util.Collections; |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 22 | import java.util.HashMap; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 23 | import java.util.HashSet; |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 24 | import java.util.List; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 25 | import java.util.Map; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 26 | import java.util.Set; |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 27 | import java.util.concurrent.atomic.AtomicInteger; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 28 | |
| 29 | import org.apache.felix.scr.annotations.Activate; |
| 30 | import org.apache.felix.scr.annotations.Component; |
| 31 | import org.apache.felix.scr.annotations.Deactivate; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 32 | import org.apache.felix.scr.annotations.Reference; |
| 33 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 34 | import org.apache.felix.scr.annotations.Service; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 35 | import org.onlab.onos.cluster.ClusterEventListener; |
| 36 | import org.onlab.onos.cluster.ClusterService; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 37 | import org.onlab.onos.cluster.ControllerNode; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 38 | import org.onlab.onos.cluster.ControllerNode.State; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 39 | import org.onlab.onos.cluster.DefaultControllerNode; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 40 | import org.onlab.onos.cluster.NodeId; |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 41 | import org.onlab.onos.cluster.RoleInfo; |
Yuta HIGUCHI | 80912e6 | 2014-10-12 00:15:47 -0700 | [diff] [blame] | 42 | import org.onlab.onos.mastership.MastershipEvent; |
| 43 | import org.onlab.onos.mastership.MastershipStore; |
| 44 | import org.onlab.onos.mastership.MastershipStoreDelegate; |
| 45 | import org.onlab.onos.mastership.MastershipTerm; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 46 | import org.onlab.onos.net.DeviceId; |
| 47 | import org.onlab.onos.net.MastershipRole; |
tom | f80c972 | 2014-09-24 14:49:18 -0700 | [diff] [blame] | 48 | import org.onlab.onos.store.AbstractStore; |
Pavlin Radoslavov | 444b519 | 2014-10-28 10:45:19 -0700 | [diff] [blame] | 49 | import org.onlab.packet.IpAddress; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 50 | import org.slf4j.Logger; |
| 51 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 52 | import com.google.common.collect.ImmutableList; |
| 53 | import com.google.common.collect.ImmutableSet; |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 54 | |
Yuta HIGUCHI | 80912e6 | 2014-10-12 00:15:47 -0700 | [diff] [blame] | 55 | import static org.onlab.onos.mastership.MastershipEvent.Type.*; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 56 | |
| 57 | /** |
| 58 | * Manages inventory of controller mastership over devices using |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 59 | * trivial, non-distributed in-memory structures implementation. |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 60 | */ |
| 61 | @Component(immediate = true) |
| 62 | @Service |
tom | f80c972 | 2014-09-24 14:49:18 -0700 | [diff] [blame] | 63 | public class SimpleMastershipStore |
| 64 | extends AbstractStore<MastershipEvent, MastershipStoreDelegate> |
| 65 | implements MastershipStore { |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 66 | |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 67 | private final Logger log = getLogger(getClass()); |
| 68 | |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 69 | private static final int NOTHING = 0; |
| 70 | private static final int INIT = 1; |
| 71 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 72 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 73 | protected ClusterService clusterService; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 74 | |
| 75 | //devices mapped to their masters, to emulate multiple nodes |
Ayaka Koshibe | 3de43ca | 2014-09-26 16:40:23 -0700 | [diff] [blame] | 76 | protected final Map<DeviceId, NodeId> masterMap = new HashMap<>(); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 77 | //emulate backups with pile of nodes |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 78 | protected final Map<DeviceId, List<NodeId>> backups = new HashMap<>(); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 79 | //terms |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 80 | protected final Map<DeviceId, AtomicInteger> termMap = new HashMap<>(); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 81 | |
| 82 | @Activate |
| 83 | public void activate() { |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 84 | if (clusterService == null) { |
| 85 | // just for ease of unit test |
| 86 | final ControllerNode instance = |
| 87 | new DefaultControllerNode(new NodeId("local"), |
| 88 | IpAddress.valueOf("127.0.0.1")); |
| 89 | |
| 90 | clusterService = new ClusterService() { |
| 91 | |
| 92 | @Override |
| 93 | public ControllerNode getLocalNode() { |
| 94 | return instance; |
| 95 | } |
| 96 | |
| 97 | @Override |
| 98 | public Set<ControllerNode> getNodes() { |
| 99 | return ImmutableSet.of(instance); |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public ControllerNode getNode(NodeId nodeId) { |
| 104 | if (instance.id().equals(nodeId)) { |
| 105 | return instance; |
| 106 | } |
| 107 | return null; |
| 108 | } |
| 109 | |
| 110 | @Override |
| 111 | public State getState(NodeId nodeId) { |
| 112 | if (instance.id().equals(nodeId)) { |
| 113 | return State.ACTIVE; |
| 114 | } else { |
| 115 | return State.INACTIVE; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | public void addListener(ClusterEventListener listener) { |
| 121 | } |
| 122 | |
| 123 | @Override |
| 124 | public void removeListener(ClusterEventListener listener) { |
| 125 | } |
| 126 | }; |
| 127 | } |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 128 | log.info("Started"); |
| 129 | } |
| 130 | |
| 131 | @Deactivate |
| 132 | public void deactivate() { |
| 133 | log.info("Stopped"); |
| 134 | } |
| 135 | |
| 136 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 137 | public synchronized MastershipEvent setMaster(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 138 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 139 | MastershipRole role = getRole(nodeId, deviceId); |
| 140 | switch (role) { |
| 141 | case MASTER: |
| 142 | // no-op |
| 143 | return null; |
| 144 | case STANDBY: |
| 145 | case NONE: |
| 146 | NodeId prevMaster = masterMap.put(deviceId, nodeId); |
| 147 | incrementTerm(deviceId); |
| 148 | removeFromBackups(deviceId, nodeId); |
| 149 | addToBackup(deviceId, prevMaster); |
| 150 | break; |
| 151 | default: |
| 152 | log.warn("unknown Mastership Role {}", role); |
| 153 | return null; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 154 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 155 | |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 156 | return new MastershipEvent(MASTER_CHANGED, deviceId, |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 157 | getNodes(deviceId)); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 161 | public NodeId getMaster(DeviceId deviceId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 162 | return masterMap.get(deviceId); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 165 | // synchronized for atomic read |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 166 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 167 | public synchronized RoleInfo getNodes(DeviceId deviceId) { |
| 168 | return new RoleInfo(masterMap.get(deviceId), |
| 169 | backups.getOrDefault(deviceId, ImmutableList.of())); |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 173 | public Set<DeviceId> getDevices(NodeId nodeId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 174 | Set<DeviceId> ids = new HashSet<>(); |
| 175 | for (Map.Entry<DeviceId, NodeId> d : masterMap.entrySet()) { |
| 176 | if (d.getValue().equals(nodeId)) { |
| 177 | ids.add(d.getKey()); |
| 178 | } |
| 179 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 180 | return ids; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 184 | public synchronized MastershipRole requestRole(DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 185 | //query+possible reelection |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 186 | NodeId node = clusterService.getLocalNode().id(); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 187 | MastershipRole role = getRole(node, deviceId); |
| 188 | |
| 189 | switch (role) { |
| 190 | case MASTER: |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 191 | return MastershipRole.MASTER; |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 192 | case STANDBY: |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 193 | if (getMaster(deviceId) == null) { |
| 194 | // no master => become master |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 195 | masterMap.put(deviceId, node); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 196 | incrementTerm(deviceId); |
| 197 | // remove from backup list |
| 198 | removeFromBackups(deviceId, node); |
| 199 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, |
| 200 | getNodes(deviceId))); |
| 201 | return MastershipRole.MASTER; |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 202 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 203 | return MastershipRole.STANDBY; |
| 204 | case NONE: |
| 205 | if (getMaster(deviceId) == null) { |
| 206 | // no master => become master |
| 207 | masterMap.put(deviceId, node); |
| 208 | incrementTerm(deviceId); |
| 209 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, |
| 210 | getNodes(deviceId))); |
| 211 | return MastershipRole.MASTER; |
| 212 | } |
| 213 | // add to backup list |
| 214 | if (addToBackup(deviceId, node)) { |
| 215 | notifyDelegate(new MastershipEvent(BACKUPS_CHANGED, deviceId, |
| 216 | getNodes(deviceId))); |
| 217 | } |
| 218 | return MastershipRole.STANDBY; |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 219 | default: |
| 220 | log.warn("unknown Mastership Role {}", role); |
| 221 | } |
| 222 | return role; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 223 | } |
| 224 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 225 | // add to backup if not there already, silently ignores null node |
| 226 | private synchronized boolean addToBackup(DeviceId deviceId, NodeId nodeId) { |
| 227 | boolean modified = false; |
| 228 | List<NodeId> stbys = backups.getOrDefault(deviceId, new ArrayList<>()); |
| 229 | if (nodeId != null && !stbys.contains(nodeId)) { |
| 230 | stbys.add(nodeId); |
| 231 | modified = true; |
| 232 | } |
| 233 | backups.put(deviceId, stbys); |
| 234 | return modified; |
| 235 | } |
| 236 | |
| 237 | private synchronized boolean removeFromBackups(DeviceId deviceId, NodeId node) { |
| 238 | List<NodeId> stbys = backups.getOrDefault(deviceId, new ArrayList<>()); |
| 239 | boolean modified = stbys.remove(node); |
| 240 | backups.put(deviceId, stbys); |
| 241 | return modified; |
| 242 | } |
| 243 | |
| 244 | private synchronized void incrementTerm(DeviceId deviceId) { |
| 245 | AtomicInteger term = termMap.getOrDefault(deviceId, new AtomicInteger(NOTHING)); |
| 246 | term.incrementAndGet(); |
| 247 | termMap.put(deviceId, term); |
| 248 | } |
| 249 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 250 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 251 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 252 | //just query |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 253 | NodeId current = masterMap.get(deviceId); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 254 | MastershipRole role; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 255 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 256 | if (current != null && current.equals(nodeId)) { |
| 257 | return MastershipRole.MASTER; |
| 258 | } |
| 259 | |
| 260 | if (backups.getOrDefault(deviceId, Collections.emptyList()).contains(nodeId)) { |
| 261 | role = MastershipRole.STANDBY; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 262 | } else { |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 263 | role = MastershipRole.NONE; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 264 | } |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 265 | return role; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 268 | // synchronized for atomic read |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 269 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 270 | public synchronized MastershipTerm getTermFor(DeviceId deviceId) { |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 271 | if ((termMap.get(deviceId) == null)) { |
| 272 | return MastershipTerm.of(masterMap.get(deviceId), NOTHING); |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 273 | } |
| 274 | return MastershipTerm.of( |
| 275 | masterMap.get(deviceId), termMap.get(deviceId).get()); |
| 276 | } |
| 277 | |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 278 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 279 | public synchronized MastershipEvent setStandby(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 280 | MastershipRole role = getRole(nodeId, deviceId); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 281 | switch (role) { |
| 282 | case MASTER: |
| 283 | NodeId backup = reelect(deviceId, nodeId); |
| 284 | if (backup == null) { |
| 285 | // no master alternative |
| 286 | masterMap.remove(deviceId); |
| 287 | // TODO: Should there be new event type for no MASTER? |
| 288 | return new MastershipEvent(MASTER_CHANGED, deviceId, |
| 289 | getNodes(deviceId)); |
| 290 | } else { |
| 291 | NodeId prevMaster = masterMap.put(deviceId, backup); |
| 292 | incrementTerm(deviceId); |
| 293 | addToBackup(deviceId, prevMaster); |
| 294 | return new MastershipEvent(MASTER_CHANGED, deviceId, |
| 295 | getNodes(deviceId)); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 296 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 297 | case STANDBY: |
| 298 | case NONE: |
| 299 | boolean modified = addToBackup(deviceId, nodeId); |
| 300 | if (modified) { |
| 301 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, |
| 302 | getNodes(deviceId)); |
| 303 | } |
| 304 | default: |
| 305 | log.warn("unknown Mastership Role {}", role); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 306 | } |
| 307 | return null; |
| 308 | } |
| 309 | |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 310 | //dumbly selects next-available node that's not the current one |
| 311 | //emulate leader election |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 312 | private synchronized NodeId reelect(DeviceId did, NodeId nodeId) { |
| 313 | List<NodeId> stbys = backups.getOrDefault(did, Collections.emptyList()); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 314 | NodeId backup = null; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 315 | for (NodeId n : stbys) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 316 | if (!n.equals(nodeId)) { |
| 317 | backup = n; |
| 318 | break; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 319 | } |
| 320 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 321 | stbys.remove(backup); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 322 | return backup; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 323 | } |
| 324 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 325 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 326 | public synchronized MastershipEvent relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 327 | MastershipRole role = getRole(nodeId, deviceId); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 328 | switch (role) { |
| 329 | case MASTER: |
| 330 | NodeId backup = reelect(deviceId, nodeId); |
| 331 | masterMap.put(deviceId, backup); |
| 332 | incrementTerm(deviceId); |
| 333 | return new MastershipEvent(MASTER_CHANGED, deviceId, |
| 334 | getNodes(deviceId)); |
| 335 | case STANDBY: |
| 336 | if (removeFromBackups(deviceId, nodeId)) { |
| 337 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, |
| 338 | getNodes(deviceId)); |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 339 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame^] | 340 | case NONE: |
| 341 | default: |
| 342 | log.warn("unknown Mastership Role {}", role); |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 343 | } |
| 344 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 345 | } |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 346 | } |