Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 1 | /* |
Brian O'Connor | 5ab426f | 2016-04-09 01:19:45 -0700 | [diff] [blame] | 2 | * Copyright 2016-present Open Networking Laboratory |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.store.primitives.resources.impl; |
| 17 | |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 18 | import io.atomix.copycat.Operation; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 19 | import io.atomix.copycat.client.CopycatClient; |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 20 | import io.atomix.resource.AbstractResource; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 21 | import io.atomix.resource.ResourceTypeInfo; |
| 22 | |
Madan Jampani | d7ff34d | 2016-05-26 18:20:55 -0700 | [diff] [blame] | 23 | import java.util.Collection; |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 24 | import java.util.List; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 25 | import java.util.Map; |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 26 | import java.util.Properties; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 27 | import java.util.Set; |
| 28 | import java.util.concurrent.CompletableFuture; |
| 29 | import java.util.function.Consumer; |
| 30 | |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 31 | import org.onlab.util.Tools; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 32 | import org.onosproject.cluster.Leadership; |
| 33 | import org.onosproject.cluster.NodeId; |
| 34 | import org.onosproject.event.Change; |
Madan Jampani | 27a2a3d | 2016-03-03 08:46:24 -0800 | [diff] [blame] | 35 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Anoint; |
| 36 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.GetAllLeaderships; |
| 37 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.GetElectedTopics; |
| 38 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.GetLeadership; |
| 39 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Listen; |
| 40 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Promote; |
| 41 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Run; |
| 42 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Unlisten; |
| 43 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Withdraw; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 44 | import org.onosproject.store.service.AsyncLeaderElector; |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 45 | import org.onosproject.store.service.StorageException; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 46 | |
Madan Jampani | d7ff34d | 2016-05-26 18:20:55 -0700 | [diff] [blame] | 47 | import com.google.common.collect.ImmutableSet; |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 48 | import com.google.common.cache.CacheBuilder; |
| 49 | import com.google.common.cache.CacheLoader; |
| 50 | import com.google.common.cache.LoadingCache; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 51 | import com.google.common.collect.Sets; |
| 52 | |
| 53 | /** |
| 54 | * Distributed resource providing the {@link AsyncLeaderElector} primitive. |
| 55 | */ |
Madan Jampani | 966a585 | 2016-04-01 10:39:57 -0700 | [diff] [blame] | 56 | @ResourceTypeInfo(id = -152, factory = AtomixLeaderElectorFactory.class) |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 57 | public class AtomixLeaderElector extends AbstractResource<AtomixLeaderElector> |
Madan Jampani | fc98177 | 2016-02-16 09:46:42 -0800 | [diff] [blame] | 58 | implements AsyncLeaderElector { |
Madan Jampani | d7ff34d | 2016-05-26 18:20:55 -0700 | [diff] [blame] | 59 | private final Set<Consumer<Status>> statusChangeListeners = |
| 60 | Sets.newCopyOnWriteArraySet(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 61 | private final Set<Consumer<Change<Leadership>>> leadershipChangeListeners = |
Madan Jampani | d7ff34d | 2016-05-26 18:20:55 -0700 | [diff] [blame] | 62 | Sets.newCopyOnWriteArraySet(); |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 63 | private final Consumer<Change<Leadership>> cacheUpdater; |
| 64 | private final Consumer<Status> statusListener; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 65 | |
Madan Jampani | c94b485 | 2016-02-23 18:18:37 -0800 | [diff] [blame] | 66 | public static final String CHANGE_SUBJECT = "leadershipChangeEvents"; |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 67 | private final LoadingCache<String, CompletableFuture<Leadership>> cache; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 68 | |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 69 | public AtomixLeaderElector(CopycatClient client, Properties properties) { |
| 70 | super(client, properties); |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 71 | cache = CacheBuilder.newBuilder() |
| 72 | .maximumSize(1000) |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 73 | .build(CacheLoader.from(topic -> submit(new GetLeadership(topic)))); |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 74 | |
| 75 | cacheUpdater = change -> { |
| 76 | Leadership leadership = change.newValue(); |
| 77 | cache.put(leadership.topic(), CompletableFuture.completedFuture(leadership)); |
| 78 | }; |
| 79 | statusListener = status -> { |
| 80 | if (status == Status.SUSPENDED || status == Status.INACTIVE) { |
| 81 | cache.invalidateAll(); |
| 82 | } |
| 83 | }; |
| 84 | addStatusChangeListener(statusListener); |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | public CompletableFuture<Void> destroy() { |
| 89 | removeStatusChangeListener(statusListener); |
| 90 | return removeChangeListener(cacheUpdater); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | @Override |
| 94 | public String name() { |
| 95 | return null; |
| 96 | } |
| 97 | |
| 98 | @Override |
| 99 | public CompletableFuture<AtomixLeaderElector> open() { |
| 100 | return super.open().thenApply(result -> { |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 101 | client.onEvent(CHANGE_SUBJECT, this::handleEvent); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 102 | return result; |
| 103 | }); |
| 104 | } |
| 105 | |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 106 | public CompletableFuture<AtomixLeaderElector> setupCache() { |
| 107 | return addChangeListener(cacheUpdater).thenApply(v -> this); |
| 108 | } |
| 109 | |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 110 | private void handleEvent(List<Change<Leadership>> changes) { |
| 111 | changes.forEach(change -> leadershipChangeListeners.forEach(l -> l.accept(change))); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | @Override |
| 115 | public CompletableFuture<Leadership> run(String topic, NodeId nodeId) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 116 | return submit(new Run(topic, nodeId)).whenComplete((r, e) -> cache.invalidate(topic)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | @Override |
| 120 | public CompletableFuture<Void> withdraw(String topic) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 121 | return submit(new Withdraw(topic)).whenComplete((r, e) -> cache.invalidate(topic)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | @Override |
| 125 | public CompletableFuture<Boolean> anoint(String topic, NodeId nodeId) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 126 | return submit(new Anoint(topic, nodeId)).whenComplete((r, e) -> cache.invalidate(topic)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | @Override |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 130 | public CompletableFuture<Boolean> promote(String topic, NodeId nodeId) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 131 | return submit(new Promote(topic, nodeId)).whenComplete((r, e) -> cache.invalidate(topic)); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | @Override |
| 135 | public CompletableFuture<Void> evict(NodeId nodeId) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 136 | return submit(new AtomixLeaderElectorCommands.Evict(nodeId)); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | @Override |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 140 | public CompletableFuture<Leadership> getLeadership(String topic) { |
Madan Jampani | 7701244 | 2016-06-02 07:47:42 -0700 | [diff] [blame] | 141 | return cache.getUnchecked(topic) |
| 142 | .whenComplete((r, e) -> { |
| 143 | if (e != null) { |
| 144 | cache.invalidate(topic); |
| 145 | } |
| 146 | }); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | @Override |
| 150 | public CompletableFuture<Map<String, Leadership>> getLeaderships() { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 151 | return submit(new GetAllLeaderships()); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | public CompletableFuture<Set<String>> getElectedTopics(NodeId nodeId) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 155 | return submit(new GetElectedTopics(nodeId)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 156 | } |
| 157 | |
Madan Jampani | 27a2a3d | 2016-03-03 08:46:24 -0800 | [diff] [blame] | 158 | @Override |
| 159 | public synchronized CompletableFuture<Void> addChangeListener(Consumer<Change<Leadership>> consumer) { |
| 160 | if (leadershipChangeListeners.isEmpty()) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 161 | return submit(new Listen()).thenRun(() -> leadershipChangeListeners.add(consumer)); |
Madan Jampani | 27a2a3d | 2016-03-03 08:46:24 -0800 | [diff] [blame] | 162 | } else { |
| 163 | leadershipChangeListeners.add(consumer); |
| 164 | return CompletableFuture.completedFuture(null); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 165 | } |
| 166 | } |
| 167 | |
| 168 | @Override |
Madan Jampani | 27a2a3d | 2016-03-03 08:46:24 -0800 | [diff] [blame] | 169 | public synchronized CompletableFuture<Void> removeChangeListener(Consumer<Change<Leadership>> consumer) { |
Madan Jampani | 68b1f5a | 2016-04-05 19:17:58 -0700 | [diff] [blame] | 170 | if (leadershipChangeListeners.remove(consumer) && leadershipChangeListeners.isEmpty()) { |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 171 | return submit(new Unlisten()).thenApply(v -> null); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 172 | } |
| 173 | return CompletableFuture.completedFuture(null); |
| 174 | } |
Madan Jampani | d7ff34d | 2016-05-26 18:20:55 -0700 | [diff] [blame] | 175 | |
| 176 | @Override |
| 177 | public void addStatusChangeListener(Consumer<Status> listener) { |
| 178 | statusChangeListeners.add(listener); |
| 179 | } |
| 180 | |
| 181 | @Override |
| 182 | public void removeStatusChangeListener(Consumer<Status> listener) { |
| 183 | statusChangeListeners.remove(listener); |
| 184 | } |
| 185 | |
| 186 | @Override |
| 187 | public Collection<Consumer<Status>> statusChangeListeners() { |
| 188 | return ImmutableSet.copyOf(statusChangeListeners); |
| 189 | } |
Madan Jampani | d5b200f | 2016-06-06 17:15:25 -0700 | [diff] [blame^] | 190 | |
| 191 | <T> CompletableFuture<T> submit(Operation<T> command) { |
| 192 | if (client.state() == CopycatClient.State.SUSPENDED || client.state() == CopycatClient.State.CLOSED) { |
| 193 | return Tools.exceptionalFuture(new StorageException.Unavailable()); |
| 194 | } |
| 195 | return client.submit(command); |
| 196 | } |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 197 | } |