Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 1 | /* |
Ray Milkey | 34c9590 | 2015-04-15 09:47:53 -0700 | [diff] [blame] | 2 | * Copyright 2014-2015 Open Networking Laboratory |
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 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 22 | import java.util.ArrayList; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 23 | import java.util.Collections; |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 24 | import java.util.HashMap; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 25 | import java.util.HashSet; |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 26 | import java.util.List; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 27 | import java.util.Map; |
Thomas Vachuska | a68be81 | 2014-11-27 11:49:54 -0800 | [diff] [blame] | 28 | import java.util.Objects; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 29 | import java.util.Set; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 30 | import java.util.concurrent.CompletableFuture; |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 31 | import java.util.concurrent.atomic.AtomicInteger; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 32 | |
| 33 | import org.apache.felix.scr.annotations.Activate; |
| 34 | import org.apache.felix.scr.annotations.Component; |
| 35 | import org.apache.felix.scr.annotations.Deactivate; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 36 | import org.apache.felix.scr.annotations.Reference; |
| 37 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 38 | import org.apache.felix.scr.annotations.Service; |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 39 | import org.joda.time.DateTime; |
| 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; |
| 48 | import org.onosproject.mastership.MastershipEvent; |
| 49 | import org.onosproject.mastership.MastershipStore; |
| 50 | import org.onosproject.mastership.MastershipStoreDelegate; |
| 51 | import org.onosproject.mastership.MastershipTerm; |
| 52 | import org.onosproject.net.DeviceId; |
| 53 | import org.onosproject.net.MastershipRole; |
| 54 | import org.onosproject.store.AbstractStore; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 55 | import org.slf4j.Logger; |
| 56 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 57 | import com.google.common.collect.ImmutableList; |
| 58 | import com.google.common.collect.ImmutableSet; |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 59 | |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 60 | /** |
| 61 | * Manages inventory of controller mastership over devices using |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 62 | * trivial, non-distributed in-memory structures implementation. |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 63 | */ |
| 64 | @Component(immediate = true) |
| 65 | @Service |
tom | f80c972 | 2014-09-24 14:49:18 -0700 | [diff] [blame] | 66 | public class SimpleMastershipStore |
| 67 | extends AbstractStore<MastershipEvent, MastershipStoreDelegate> |
| 68 | implements MastershipStore { |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 69 | |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 70 | private final Logger log = getLogger(getClass()); |
| 71 | |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 72 | private static final int NOTHING = 0; |
| 73 | private static final int INIT = 1; |
| 74 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 75 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 76 | protected ClusterService clusterService; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 77 | |
| 78 | //devices mapped to their masters, to emulate multiple nodes |
Ayaka Koshibe | 3de43ca | 2014-09-26 16:40:23 -0700 | [diff] [blame] | 79 | protected final Map<DeviceId, NodeId> masterMap = new HashMap<>(); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 80 | //emulate backups with pile of nodes |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 81 | protected final Map<DeviceId, List<NodeId>> backups = new HashMap<>(); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 82 | //terms |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 83 | protected final Map<DeviceId, AtomicInteger> termMap = new HashMap<>(); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 84 | |
| 85 | @Activate |
| 86 | public void activate() { |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 87 | if (clusterService == null) { |
| 88 | // just for ease of unit test |
| 89 | final ControllerNode instance = |
| 90 | new DefaultControllerNode(new NodeId("local"), |
| 91 | IpAddress.valueOf("127.0.0.1")); |
| 92 | |
| 93 | clusterService = new ClusterService() { |
| 94 | |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 95 | private final DateTime creationTime = DateTime.now(); |
| 96 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 97 | @Override |
| 98 | public ControllerNode getLocalNode() { |
| 99 | return instance; |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public Set<ControllerNode> getNodes() { |
| 104 | return ImmutableSet.of(instance); |
| 105 | } |
| 106 | |
| 107 | @Override |
| 108 | public ControllerNode getNode(NodeId nodeId) { |
| 109 | if (instance.id().equals(nodeId)) { |
| 110 | return instance; |
| 111 | } |
| 112 | return null; |
| 113 | } |
| 114 | |
| 115 | @Override |
| 116 | public State getState(NodeId nodeId) { |
| 117 | if (instance.id().equals(nodeId)) { |
| 118 | return State.ACTIVE; |
| 119 | } else { |
| 120 | return State.INACTIVE; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | @Override |
Madan Jampani | 7d2fab2 | 2015-03-18 17:21:57 -0700 | [diff] [blame] | 125 | public DateTime getLastUpdated(NodeId nodeId) { |
| 126 | return creationTime; |
| 127 | } |
| 128 | |
| 129 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 130 | public void addListener(ClusterEventListener listener) { |
| 131 | } |
| 132 | |
| 133 | @Override |
| 134 | public void removeListener(ClusterEventListener listener) { |
| 135 | } |
| 136 | }; |
| 137 | } |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 138 | log.info("Started"); |
| 139 | } |
| 140 | |
| 141 | @Deactivate |
| 142 | public void deactivate() { |
| 143 | log.info("Stopped"); |
| 144 | } |
| 145 | |
| 146 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 147 | public synchronized CompletableFuture<MastershipEvent> setMaster(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 148 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 149 | MastershipRole role = getRole(nodeId, deviceId); |
| 150 | switch (role) { |
| 151 | case MASTER: |
| 152 | // no-op |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 153 | return CompletableFuture.completedFuture(null); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 154 | case STANDBY: |
| 155 | case NONE: |
| 156 | NodeId prevMaster = masterMap.put(deviceId, nodeId); |
| 157 | incrementTerm(deviceId); |
| 158 | removeFromBackups(deviceId, nodeId); |
| 159 | addToBackup(deviceId, prevMaster); |
| 160 | break; |
| 161 | default: |
| 162 | log.warn("unknown Mastership Role {}", role); |
| 163 | return null; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 164 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 165 | |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 166 | return CompletableFuture.completedFuture( |
| 167 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 171 | public NodeId getMaster(DeviceId deviceId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 172 | return masterMap.get(deviceId); |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 175 | // synchronized for atomic read |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 176 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 177 | public synchronized RoleInfo getNodes(DeviceId deviceId) { |
| 178 | return new RoleInfo(masterMap.get(deviceId), |
| 179 | backups.getOrDefault(deviceId, ImmutableList.of())); |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 183 | public Set<DeviceId> getDevices(NodeId nodeId) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 184 | Set<DeviceId> ids = new HashSet<>(); |
| 185 | for (Map.Entry<DeviceId, NodeId> d : masterMap.entrySet()) { |
Thomas Vachuska | a68be81 | 2014-11-27 11:49:54 -0800 | [diff] [blame] | 186 | if (Objects.equals(d.getValue(), nodeId)) { |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 187 | ids.add(d.getKey()); |
| 188 | } |
| 189 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 190 | return ids; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | @Override |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 194 | public synchronized CompletableFuture<MastershipRole> requestRole(DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 195 | //query+possible reelection |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 196 | NodeId node = clusterService.getLocalNode().id(); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 197 | MastershipRole role = getRole(node, deviceId); |
| 198 | |
| 199 | switch (role) { |
| 200 | case MASTER: |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 201 | return CompletableFuture.completedFuture(MastershipRole.MASTER); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 202 | case STANDBY: |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 203 | if (getMaster(deviceId) == null) { |
| 204 | // no master => become master |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 205 | masterMap.put(deviceId, node); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 206 | incrementTerm(deviceId); |
| 207 | // remove from backup list |
| 208 | removeFromBackups(deviceId, node); |
| 209 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, |
| 210 | getNodes(deviceId))); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 211 | return CompletableFuture.completedFuture(MastershipRole.MASTER); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 212 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 213 | return CompletableFuture.completedFuture(MastershipRole.STANDBY); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 214 | case NONE: |
| 215 | if (getMaster(deviceId) == null) { |
| 216 | // no master => become master |
| 217 | masterMap.put(deviceId, node); |
| 218 | incrementTerm(deviceId); |
| 219 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, |
| 220 | getNodes(deviceId))); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 221 | return CompletableFuture.completedFuture(MastershipRole.MASTER); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 222 | } |
| 223 | // add to backup list |
| 224 | if (addToBackup(deviceId, node)) { |
| 225 | notifyDelegate(new MastershipEvent(BACKUPS_CHANGED, deviceId, |
| 226 | getNodes(deviceId))); |
| 227 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 228 | return CompletableFuture.completedFuture(MastershipRole.STANDBY); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 229 | default: |
| 230 | log.warn("unknown Mastership Role {}", role); |
| 231 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 232 | return CompletableFuture.completedFuture(role); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 233 | } |
| 234 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 235 | // add to backup if not there already, silently ignores null node |
| 236 | private synchronized boolean addToBackup(DeviceId deviceId, NodeId nodeId) { |
| 237 | boolean modified = false; |
| 238 | List<NodeId> stbys = backups.getOrDefault(deviceId, new ArrayList<>()); |
| 239 | if (nodeId != null && !stbys.contains(nodeId)) { |
| 240 | stbys.add(nodeId); |
| 241 | modified = true; |
| 242 | } |
| 243 | backups.put(deviceId, stbys); |
| 244 | return modified; |
| 245 | } |
| 246 | |
| 247 | private synchronized boolean removeFromBackups(DeviceId deviceId, NodeId node) { |
| 248 | List<NodeId> stbys = backups.getOrDefault(deviceId, new ArrayList<>()); |
| 249 | boolean modified = stbys.remove(node); |
| 250 | backups.put(deviceId, stbys); |
| 251 | return modified; |
| 252 | } |
| 253 | |
| 254 | private synchronized void incrementTerm(DeviceId deviceId) { |
| 255 | AtomicInteger term = termMap.getOrDefault(deviceId, new AtomicInteger(NOTHING)); |
| 256 | term.incrementAndGet(); |
| 257 | termMap.put(deviceId, term); |
| 258 | } |
| 259 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 260 | @Override |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 261 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 262 | //just query |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 263 | NodeId current = masterMap.get(deviceId); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 264 | MastershipRole role; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 265 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 266 | if (current != null && current.equals(nodeId)) { |
| 267 | return MastershipRole.MASTER; |
| 268 | } |
| 269 | |
| 270 | if (backups.getOrDefault(deviceId, Collections.emptyList()).contains(nodeId)) { |
| 271 | role = MastershipRole.STANDBY; |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 272 | } else { |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 273 | role = MastershipRole.NONE; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 274 | } |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 275 | return role; |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 276 | } |
| 277 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 278 | // synchronized for atomic read |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 279 | @Override |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 280 | public synchronized MastershipTerm getTermFor(DeviceId deviceId) { |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 281 | if ((termMap.get(deviceId) == null)) { |
| 282 | return MastershipTerm.of(masterMap.get(deviceId), NOTHING); |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 283 | } |
| 284 | return MastershipTerm.of( |
| 285 | masterMap.get(deviceId), termMap.get(deviceId).get()); |
| 286 | } |
| 287 | |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 288 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 289 | public synchronized CompletableFuture<MastershipEvent> setStandby(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 290 | MastershipRole role = getRole(nodeId, deviceId); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 291 | switch (role) { |
| 292 | case MASTER: |
| 293 | NodeId backup = reelect(deviceId, nodeId); |
| 294 | if (backup == null) { |
| 295 | // no master alternative |
| 296 | masterMap.remove(deviceId); |
| 297 | // TODO: Should there be new event type for no MASTER? |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 298 | return CompletableFuture.completedFuture( |
| 299 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 300 | } else { |
| 301 | NodeId prevMaster = masterMap.put(deviceId, backup); |
| 302 | incrementTerm(deviceId); |
| 303 | addToBackup(deviceId, prevMaster); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 304 | return CompletableFuture.completedFuture( |
| 305 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 306 | } |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 307 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 308 | case STANDBY: |
| 309 | case NONE: |
| 310 | boolean modified = addToBackup(deviceId, nodeId); |
| 311 | if (modified) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 312 | return CompletableFuture.completedFuture( |
| 313 | new MastershipEvent(BACKUPS_CHANGED, deviceId, getNodes(deviceId))); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 314 | } |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 315 | break; |
| 316 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 317 | default: |
| 318 | log.warn("unknown Mastership Role {}", role); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 319 | } |
| 320 | return null; |
| 321 | } |
| 322 | |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 323 | //dumbly selects next-available node that's not the current one |
| 324 | //emulate leader election |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 325 | private synchronized NodeId reelect(DeviceId did, NodeId nodeId) { |
| 326 | List<NodeId> stbys = backups.getOrDefault(did, Collections.emptyList()); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 327 | NodeId backup = null; |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 328 | for (NodeId n : stbys) { |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 329 | if (!n.equals(nodeId)) { |
| 330 | backup = n; |
| 331 | break; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 332 | } |
| 333 | } |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 334 | stbys.remove(backup); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 335 | return backup; |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 338 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 339 | public synchronized CompletableFuture<MastershipEvent> relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 340 | MastershipRole role = getRole(nodeId, deviceId); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 341 | switch (role) { |
| 342 | case MASTER: |
| 343 | NodeId backup = reelect(deviceId, nodeId); |
| 344 | masterMap.put(deviceId, backup); |
| 345 | incrementTerm(deviceId); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 346 | return CompletableFuture.completedFuture( |
| 347 | new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 348 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 349 | case STANDBY: |
| 350 | if (removeFromBackups(deviceId, nodeId)) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 351 | return CompletableFuture.completedFuture( |
| 352 | new MastershipEvent(BACKUPS_CHANGED, deviceId, getNodes(deviceId))); |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 353 | } |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 354 | break; |
| 355 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 356 | case NONE: |
Yuta HIGUCHI | 1b3f4db | 2014-11-18 11:04:31 -0800 | [diff] [blame] | 357 | break; |
| 358 | |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 359 | default: |
| 360 | log.warn("unknown Mastership Role {}", role); |
Ayaka Koshibe | b62aab5 | 2014-10-24 13:15:25 -0700 | [diff] [blame] | 361 | } |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 362 | return CompletableFuture.completedFuture(null); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 363 | } |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 364 | |
| 365 | @Override |
| 366 | public synchronized void relinquishAllRole(NodeId nodeId) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 367 | List<CompletableFuture<MastershipEvent>> eventFutures = new ArrayList<>(); |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 368 | Set<DeviceId> toRelinquish = new HashSet<>(); |
| 369 | |
| 370 | masterMap.entrySet().stream() |
| 371 | .filter(entry -> nodeId.equals(entry.getValue())) |
| 372 | .forEach(entry -> toRelinquish.add(entry.getKey())); |
| 373 | |
| 374 | backups.entrySet().stream() |
| 375 | .filter(entry -> entry.getValue().contains(nodeId)) |
| 376 | .forEach(entry -> toRelinquish.add(entry.getKey())); |
| 377 | |
Sho SHIMIZU | feafdca | 2015-09-11 15:02:21 -0700 | [diff] [blame] | 378 | toRelinquish.forEach(deviceId -> eventFutures.add(relinquishRole(nodeId, deviceId))); |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 379 | |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 380 | eventFutures.forEach(future -> { |
Sho SHIMIZU | feafdca | 2015-09-11 15:02:21 -0700 | [diff] [blame] | 381 | future.whenComplete((event, error) -> notifyDelegate(event)); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 382 | }); |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 383 | } |
Ayaka Koshibe | a7f044e | 2014-09-23 16:56:20 -0700 | [diff] [blame] | 384 | } |