Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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 | */ |
| 16 | package org.onosproject.store.impl; |
| 17 | |
| 18 | import com.google.common.base.MoreObjects; |
| 19 | import org.onlab.util.KryoNamespace; |
| 20 | import org.onosproject.cluster.ClusterService; |
| 21 | import org.onosproject.cluster.NodeId; |
| 22 | import org.onosproject.store.Timestamp; |
| 23 | import org.onosproject.store.cluster.messaging.ClusterCommunicationService; |
| 24 | import org.onosproject.store.cluster.messaging.ClusterMessage; |
| 25 | import org.onosproject.store.cluster.messaging.ClusterMessageHandler; |
| 26 | import org.onosproject.store.cluster.messaging.MessageSubject; |
| 27 | import org.onosproject.store.serializers.KryoSerializer; |
| 28 | import org.slf4j.Logger; |
| 29 | import org.slf4j.LoggerFactory; |
| 30 | |
| 31 | import java.io.IOException; |
| 32 | import java.util.ArrayList; |
| 33 | import java.util.Collection; |
| 34 | import java.util.Collections; |
| 35 | import java.util.List; |
| 36 | import java.util.Map; |
| 37 | import java.util.Set; |
| 38 | import java.util.concurrent.ConcurrentHashMap; |
| 39 | import java.util.concurrent.CopyOnWriteArraySet; |
| 40 | import java.util.concurrent.ExecutorService; |
| 41 | import java.util.concurrent.Executors; |
| 42 | import java.util.concurrent.ScheduledExecutorService; |
| 43 | import java.util.stream.Collectors; |
| 44 | |
| 45 | import static com.google.common.base.Preconditions.checkNotNull; |
| 46 | import static com.google.common.base.Preconditions.checkState; |
| 47 | import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor; |
| 48 | import static org.onlab.util.Tools.minPriority; |
| 49 | import static org.onlab.util.Tools.namedThreads; |
| 50 | |
| 51 | /** |
| 52 | * Distributed Map implementation which uses optimistic replication and gossip |
| 53 | * based techniques to provide an eventually consistent data store. |
| 54 | */ |
| 55 | public class EventuallyConsistentMapImpl<K, V> |
| 56 | implements EventuallyConsistentMap<K, V> { |
| 57 | |
| 58 | private static final Logger log = LoggerFactory.getLogger(EventuallyConsistentMapImpl.class); |
| 59 | |
| 60 | private final Map<K, Timestamped<V>> items; |
| 61 | private final Map<K, Timestamp> removedItems; |
| 62 | |
| 63 | private final String mapName; |
| 64 | private final ClusterService clusterService; |
| 65 | private final ClusterCommunicationService clusterCommunicator; |
| 66 | private final KryoSerializer serializer; |
| 67 | |
| 68 | private final ClockService<K> clockService; |
| 69 | |
| 70 | private final MessageSubject updateMessageSubject; |
| 71 | private final MessageSubject removeMessageSubject; |
| 72 | |
| 73 | private final Set<EventuallyConsistentMapListener> listeners |
| 74 | = new CopyOnWriteArraySet<>(); |
| 75 | |
| 76 | private final ExecutorService executor; |
| 77 | |
| 78 | private final ScheduledExecutorService backgroundExecutor; |
| 79 | |
| 80 | private volatile boolean destroyed = false; |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 81 | private static final String ERROR_DESTROYED = " map is already destroyed"; |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 82 | |
| 83 | // TODO: Make these anti-entropy params configurable |
| 84 | private long initialDelaySec = 5; |
| 85 | private long periodSec = 5; |
| 86 | |
| 87 | /** |
| 88 | * Creates a new eventually consistent map shared amongst multiple instances. |
| 89 | * |
| 90 | * Each map is identified by a string map name. EventuallyConsistentMapImpl |
| 91 | * objects in different JVMs that use the same map name will form a |
| 92 | * distributed map across JVMs (provided the cluster service is aware of |
| 93 | * both nodes). |
| 94 | * |
| 95 | * The client is expected to provide an |
| 96 | * {@link org.onlab.util.KryoNamespace.Builder} with which all classes that |
| 97 | * will be stored in this map have been registered (including referenced |
| 98 | * classes). This serializer will be used to serialize both K and V for |
| 99 | * inter-node notifications. |
| 100 | * |
| 101 | * The client must provide an {@link org.onosproject.store.impl.ClockService} |
| 102 | * which can generate timestamps for a given key. The clock service is free |
| 103 | * to generate timestamps however it wishes, however these timestamps will |
| 104 | * be used to serialize updates to the map so they must be strict enough |
| 105 | * to ensure updates are properly ordered for the use case (i.e. in some |
| 106 | * cases wallclock time will suffice, whereas in other cases logical time |
| 107 | * will be necessary). |
| 108 | * |
| 109 | * @param mapName a String identifier for the map. |
| 110 | * @param clusterService the cluster service |
| 111 | * @param clusterCommunicator the cluster communications service |
| 112 | * @param serializerBuilder a Kryo namespace builder that can serialize |
| 113 | * both K and V |
| 114 | * @param clockService a clock service able to generate timestamps |
| 115 | * for K |
| 116 | */ |
| 117 | public EventuallyConsistentMapImpl(String mapName, |
| 118 | ClusterService clusterService, |
| 119 | ClusterCommunicationService clusterCommunicator, |
| 120 | KryoNamespace.Builder serializerBuilder, |
| 121 | ClockService<K> clockService) { |
| 122 | |
| 123 | this.mapName = checkNotNull(mapName); |
| 124 | this.clusterService = checkNotNull(clusterService); |
| 125 | this.clusterCommunicator = checkNotNull(clusterCommunicator); |
| 126 | |
| 127 | serializer = createSerializer(checkNotNull(serializerBuilder)); |
| 128 | |
| 129 | this.clockService = checkNotNull(clockService); |
| 130 | |
| 131 | items = new ConcurrentHashMap<>(); |
| 132 | removedItems = new ConcurrentHashMap<>(); |
| 133 | |
| 134 | executor = Executors |
| 135 | .newCachedThreadPool(namedThreads("onos-ecm-" + mapName + "-fg-%d")); |
| 136 | |
| 137 | backgroundExecutor = |
| 138 | newSingleThreadScheduledExecutor(minPriority( |
| 139 | namedThreads("onos-ecm-" + mapName + "-bg-%d"))); |
| 140 | |
| 141 | updateMessageSubject = new MessageSubject("ecm-" + mapName + "-update"); |
| 142 | clusterCommunicator.addSubscriber(updateMessageSubject, |
| 143 | new InternalPutEventListener()); |
| 144 | removeMessageSubject = new MessageSubject("ecm-" + mapName + "-remove"); |
| 145 | clusterCommunicator.addSubscriber(removeMessageSubject, |
| 146 | new InternalRemoveEventListener()); |
| 147 | } |
| 148 | |
| 149 | private KryoSerializer createSerializer(KryoNamespace.Builder builder) { |
| 150 | return new KryoSerializer() { |
| 151 | @Override |
| 152 | protected void setupKryoPool() { |
| 153 | // Add the map's internal helper classes to the user-supplied serializer |
| 154 | serializerPool = builder |
| 155 | .register(WallClockTimestamp.class) |
| 156 | .register(PutEntry.class) |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 157 | .register(RemoveEntry.class) |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 158 | .register(ArrayList.class) |
| 159 | .register(InternalPutEvent.class) |
| 160 | .register(InternalRemoveEvent.class) |
| 161 | .build(); |
| 162 | |
| 163 | // TODO anti-entropy classes |
| 164 | } |
| 165 | }; |
| 166 | } |
| 167 | |
| 168 | @Override |
| 169 | public int size() { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 170 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 171 | return items.size(); |
| 172 | } |
| 173 | |
| 174 | @Override |
| 175 | public boolean isEmpty() { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 176 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 177 | return items.isEmpty(); |
| 178 | } |
| 179 | |
| 180 | @Override |
| 181 | public boolean containsKey(K key) { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 182 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 183 | return items.containsKey(key); |
| 184 | } |
| 185 | |
| 186 | @Override |
| 187 | public boolean containsValue(V value) { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 188 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 189 | |
| 190 | return items.values().stream() |
| 191 | .anyMatch(timestamped -> timestamped.value().equals(value)); |
| 192 | } |
| 193 | |
| 194 | @Override |
| 195 | public V get(K key) { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 196 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 197 | |
| 198 | Timestamped<V> value = items.get(key); |
| 199 | if (value != null) { |
| 200 | return value.value(); |
| 201 | } |
| 202 | return null; |
| 203 | } |
| 204 | |
| 205 | @Override |
| 206 | public void put(K key, V value) { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 207 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 208 | |
| 209 | Timestamp timestamp = clockService.getTimestamp(key); |
| 210 | if (putInternal(key, value, timestamp)) { |
| 211 | notifyPeers(new InternalPutEvent<>(key, value, timestamp)); |
| 212 | EventuallyConsistentMapEvent<K, V> externalEvent |
| 213 | = new EventuallyConsistentMapEvent<>( |
| 214 | EventuallyConsistentMapEvent.Type.PUT, key, value); |
| 215 | notifyListeners(externalEvent); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | private boolean putInternal(K key, V value, Timestamp timestamp) { |
| 220 | synchronized (this) { |
| 221 | Timestamp removed = removedItems.get(key); |
| 222 | if (removed != null && removed.compareTo(timestamp) > 0) { |
| 223 | return false; |
| 224 | } |
| 225 | |
| 226 | Timestamped<V> existing = items.get(key); |
| 227 | if (existing != null && existing.isNewer(timestamp)) { |
| 228 | return false; |
| 229 | } else { |
| 230 | items.put(key, new Timestamped<>(value, timestamp)); |
| 231 | removedItems.remove(key); |
| 232 | return true; |
| 233 | } |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | @Override |
| 238 | public void remove(K key) { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 239 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 240 | |
| 241 | Timestamp timestamp = clockService.getTimestamp(key); |
| 242 | if (removeInternal(key, timestamp)) { |
| 243 | notifyPeers(new InternalRemoveEvent<>(key, timestamp)); |
| 244 | EventuallyConsistentMapEvent<K, V> externalEvent |
| 245 | = new EventuallyConsistentMapEvent<>( |
| 246 | EventuallyConsistentMapEvent.Type.REMOVE, key, null); |
| 247 | notifyListeners(externalEvent); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | private boolean removeInternal(K key, Timestamp timestamp) { |
| 252 | synchronized (this) { |
| 253 | if (items.get(key) != null && items.get(key).isNewer(timestamp)) { |
| 254 | return false; |
| 255 | } |
| 256 | |
| 257 | items.remove(key); |
| 258 | removedItems.put(key, timestamp); |
| 259 | return true; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | @Override |
| 264 | public void putAll(Map<? extends K, ? extends V> m) { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 265 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 266 | |
| 267 | List<PutEntry<K, V>> updates = new ArrayList<>(m.size()); |
| 268 | |
| 269 | for (Map.Entry<? extends K, ? extends V> entry : m.entrySet()) { |
| 270 | K key = entry.getKey(); |
| 271 | V value = entry.getValue(); |
| 272 | Timestamp timestamp = clockService.getTimestamp(entry.getKey()); |
| 273 | |
| 274 | if (putInternal(key, value, timestamp)) { |
| 275 | updates.add(new PutEntry<>(key, value, timestamp)); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | notifyPeers(new InternalPutEvent<>(updates)); |
| 280 | |
| 281 | for (PutEntry<K, V> entry : updates) { |
| 282 | EventuallyConsistentMapEvent<K, V> externalEvent = |
| 283 | new EventuallyConsistentMapEvent<>( |
| 284 | EventuallyConsistentMapEvent.Type.PUT, entry.key(), entry.value()); |
| 285 | notifyListeners(externalEvent); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | @Override |
| 290 | public void clear() { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 291 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 292 | |
| 293 | List<RemoveEntry<K>> removed = new ArrayList<>(items.size()); |
| 294 | |
| 295 | for (K key : items.keySet()) { |
| 296 | Timestamp timestamp = clockService.getTimestamp(key); |
| 297 | |
| 298 | if (removeInternal(key, timestamp)) { |
| 299 | removed.add(new RemoveEntry<>(key, timestamp)); |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | notifyPeers(new InternalRemoveEvent<>(removed)); |
| 304 | |
| 305 | for (RemoveEntry<K> entry : removed) { |
| 306 | EventuallyConsistentMapEvent<K, V> externalEvent = |
| 307 | new EventuallyConsistentMapEvent<>( |
| 308 | EventuallyConsistentMapEvent.Type.REMOVE, entry.key(), null); |
| 309 | notifyListeners(externalEvent); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | @Override |
| 314 | public Set<K> keySet() { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 315 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 316 | |
| 317 | return items.keySet(); |
| 318 | } |
| 319 | |
| 320 | @Override |
| 321 | public Collection<V> values() { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 322 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 323 | |
| 324 | return items.values().stream() |
| 325 | .map(Timestamped::value) |
| 326 | .collect(Collectors.toList()); |
| 327 | } |
| 328 | |
| 329 | @Override |
| 330 | public Set<Map.Entry<K, V>> entrySet() { |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 331 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 332 | |
| 333 | return items.entrySet().stream() |
| 334 | .map(e -> new Entry(e.getKey(), e.getValue().value())) |
| 335 | .collect(Collectors.toSet()); |
| 336 | } |
| 337 | |
| 338 | @Override |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 339 | public void addListener(EventuallyConsistentMapListener<K, V> listener) { |
| 340 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 341 | |
| 342 | listeners.add(checkNotNull(listener)); |
| 343 | } |
| 344 | |
| 345 | @Override |
Jonathan Hart | 539a646 | 2015-01-27 17:05:43 -0800 | [diff] [blame] | 346 | public void removeListener(EventuallyConsistentMapListener<K, V> listener) { |
| 347 | checkState(!destroyed, mapName + ERROR_DESTROYED); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 348 | |
| 349 | listeners.remove(checkNotNull(listener)); |
| 350 | } |
| 351 | |
| 352 | @Override |
| 353 | public void destroy() { |
| 354 | destroyed = true; |
| 355 | |
| 356 | executor.shutdown(); |
| 357 | backgroundExecutor.shutdown(); |
| 358 | |
| 359 | clusterCommunicator.removeSubscriber(updateMessageSubject); |
| 360 | clusterCommunicator.removeSubscriber(removeMessageSubject); |
| 361 | } |
| 362 | |
| 363 | private void notifyListeners(EventuallyConsistentMapEvent event) { |
| 364 | for (EventuallyConsistentMapListener listener : listeners) { |
| 365 | listener.event(event); |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | private void notifyPeers(InternalPutEvent event) { |
Jonathan Hart | 7d656f4 | 2015-01-27 14:07:23 -0800 | [diff] [blame] | 370 | broadcastMessage(updateMessageSubject, event); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | private void notifyPeers(InternalRemoveEvent event) { |
Jonathan Hart | 7d656f4 | 2015-01-27 14:07:23 -0800 | [diff] [blame] | 374 | broadcastMessage(removeMessageSubject, event); |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 375 | } |
| 376 | |
Jonathan Hart | 7d656f4 | 2015-01-27 14:07:23 -0800 | [diff] [blame] | 377 | private void broadcastMessage(MessageSubject subject, Object event) { |
Jonathan Hart | db3af89 | 2015-01-26 13:19:07 -0800 | [diff] [blame] | 378 | ClusterMessage message = new ClusterMessage( |
| 379 | clusterService.getLocalNode().id(), |
| 380 | subject, |
| 381 | serializer.encode(event)); |
| 382 | clusterCommunicator.broadcast(message); |
| 383 | } |
| 384 | |
| 385 | private void unicastMessage(NodeId peer, |
| 386 | MessageSubject subject, |
| 387 | Object event) throws IOException { |
| 388 | ClusterMessage message = new ClusterMessage( |
| 389 | clusterService.getLocalNode().id(), |
| 390 | subject, |
| 391 | serializer.encode(event)); |
| 392 | clusterCommunicator.unicast(message, peer); |
| 393 | } |
| 394 | |
| 395 | private final class Entry implements Map.Entry<K, V> { |
| 396 | |
| 397 | private final K key; |
| 398 | private final V value; |
| 399 | |
| 400 | public Entry(K key, V value) { |
| 401 | this.key = key; |
| 402 | this.value = value; |
| 403 | } |
| 404 | |
| 405 | @Override |
| 406 | public K getKey() { |
| 407 | return key; |
| 408 | } |
| 409 | |
| 410 | @Override |
| 411 | public V getValue() { |
| 412 | return value; |
| 413 | } |
| 414 | |
| 415 | @Override |
| 416 | public V setValue(V value) { |
| 417 | throw new UnsupportedOperationException(); |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | private final class InternalPutEventListener implements |
| 422 | ClusterMessageHandler { |
| 423 | @Override |
| 424 | public void handle(ClusterMessage message) { |
| 425 | log.debug("Received put event from peer: {}", message.sender()); |
| 426 | InternalPutEvent<K, V> event = serializer.decode(message.payload()); |
| 427 | |
| 428 | executor.submit(() -> { |
| 429 | try { |
| 430 | for (PutEntry<K, V> entry : event.entries()) { |
| 431 | K key = entry.key(); |
| 432 | V value = entry.value(); |
| 433 | Timestamp timestamp = entry.timestamp(); |
| 434 | |
| 435 | if (putInternal(key, value, timestamp)) { |
| 436 | EventuallyConsistentMapEvent externalEvent = |
| 437 | new EventuallyConsistentMapEvent<>( |
| 438 | EventuallyConsistentMapEvent.Type.PUT, key, |
| 439 | value); |
| 440 | notifyListeners(externalEvent); |
| 441 | } |
| 442 | } |
| 443 | } catch (Exception e) { |
| 444 | log.warn("Exception thrown handling put", e); |
| 445 | } |
| 446 | }); |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | private final class InternalRemoveEventListener implements |
| 451 | ClusterMessageHandler { |
| 452 | @Override |
| 453 | public void handle(ClusterMessage message) { |
| 454 | log.debug("Received remove event from peer: {}", message.sender()); |
| 455 | InternalRemoveEvent<K> event = serializer.decode(message.payload()); |
| 456 | |
| 457 | executor.submit(() -> { |
| 458 | try { |
| 459 | for (RemoveEntry<K> entry : event.entries()) { |
| 460 | K key = entry.key(); |
| 461 | Timestamp timestamp = entry.timestamp(); |
| 462 | |
| 463 | if (removeInternal(key, timestamp)) { |
| 464 | EventuallyConsistentMapEvent externalEvent = new EventuallyConsistentMapEvent<K, V>( |
| 465 | EventuallyConsistentMapEvent.Type.REMOVE, |
| 466 | key, null); |
| 467 | notifyListeners(externalEvent); |
| 468 | } |
| 469 | } |
| 470 | } catch (Exception e) { |
| 471 | log.warn("Exception thrown handling remove", e); |
| 472 | } |
| 473 | }); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | private static final class InternalPutEvent<K, V> { |
| 478 | private final List<PutEntry<K, V>> entries; |
| 479 | |
| 480 | public InternalPutEvent(K key, V value, Timestamp timestamp) { |
| 481 | entries = Collections |
| 482 | .singletonList(new PutEntry<>(key, value, timestamp)); |
| 483 | } |
| 484 | |
| 485 | public InternalPutEvent(List<PutEntry<K, V>> entries) { |
| 486 | this.entries = checkNotNull(entries); |
| 487 | } |
| 488 | |
| 489 | // Needed for serialization. |
| 490 | @SuppressWarnings("unused") |
| 491 | private InternalPutEvent() { |
| 492 | entries = null; |
| 493 | } |
| 494 | |
| 495 | public List<PutEntry<K, V>> entries() { |
| 496 | return entries; |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | private static final class PutEntry<K, V> { |
| 501 | private final K key; |
| 502 | private final V value; |
| 503 | private final Timestamp timestamp; |
| 504 | |
| 505 | public PutEntry(K key, V value, Timestamp timestamp) { |
| 506 | this.key = checkNotNull(key); |
| 507 | this.value = checkNotNull(value); |
| 508 | this.timestamp = checkNotNull(timestamp); |
| 509 | } |
| 510 | |
| 511 | // Needed for serialization. |
| 512 | @SuppressWarnings("unused") |
| 513 | private PutEntry() { |
| 514 | this.key = null; |
| 515 | this.value = null; |
| 516 | this.timestamp = null; |
| 517 | } |
| 518 | |
| 519 | public K key() { |
| 520 | return key; |
| 521 | } |
| 522 | |
| 523 | public V value() { |
| 524 | return value; |
| 525 | } |
| 526 | |
| 527 | public Timestamp timestamp() { |
| 528 | return timestamp; |
| 529 | } |
| 530 | |
| 531 | public String toString() { |
| 532 | return MoreObjects.toStringHelper(getClass()) |
| 533 | .add("key", key) |
| 534 | .add("value", value) |
| 535 | .add("timestamp", timestamp) |
| 536 | .toString(); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | private static final class InternalRemoveEvent<K> { |
| 541 | private final List<RemoveEntry<K>> entries; |
| 542 | |
| 543 | public InternalRemoveEvent(K key, Timestamp timestamp) { |
| 544 | entries = Collections.singletonList( |
| 545 | new RemoveEntry<>(key, timestamp)); |
| 546 | } |
| 547 | |
| 548 | public InternalRemoveEvent(List<RemoveEntry<K>> entries) { |
| 549 | this.entries = checkNotNull(entries); |
| 550 | } |
| 551 | |
| 552 | // Needed for serialization. |
| 553 | @SuppressWarnings("unused") |
| 554 | private InternalRemoveEvent() { |
| 555 | entries = null; |
| 556 | } |
| 557 | |
| 558 | public List<RemoveEntry<K>> entries() { |
| 559 | return entries; |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | private static final class RemoveEntry<K> { |
| 564 | private final K key; |
| 565 | private final Timestamp timestamp; |
| 566 | |
| 567 | public RemoveEntry(K key, Timestamp timestamp) { |
| 568 | this.key = checkNotNull(key); |
| 569 | this.timestamp = checkNotNull(timestamp); |
| 570 | } |
| 571 | |
| 572 | // Needed for serialization. |
| 573 | @SuppressWarnings("unused") |
| 574 | private RemoveEntry() { |
| 575 | this.key = null; |
| 576 | this.timestamp = null; |
| 577 | } |
| 578 | |
| 579 | public K key() { |
| 580 | return key; |
| 581 | } |
| 582 | |
| 583 | public Timestamp timestamp() { |
| 584 | return timestamp; |
| 585 | } |
| 586 | } |
| 587 | } |