| /* |
| * Copyright 2016-present Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.store.primitives.resources.impl; |
| |
| import io.atomix.copycat.client.CopycatClient; |
| import io.atomix.resource.AbstractResource; |
| import io.atomix.resource.ResourceTypeInfo; |
| |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Properties; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.function.Consumer; |
| |
| import org.onosproject.cluster.Leadership; |
| import org.onosproject.cluster.NodeId; |
| import org.onosproject.event.Change; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Anoint; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.GetAllLeaderships; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.GetElectedTopics; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.GetLeadership; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Listen; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Promote; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Run; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Unlisten; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorCommands.Withdraw; |
| import org.onosproject.store.service.AsyncLeaderElector; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.common.collect.Sets; |
| |
| /** |
| * Distributed resource providing the {@link AsyncLeaderElector} primitive. |
| */ |
| @ResourceTypeInfo(id = -152, factory = AtomixLeaderElectorFactory.class) |
| public class AtomixLeaderElector extends AbstractResource<AtomixLeaderElector> |
| implements AsyncLeaderElector { |
| private final Set<Consumer<Status>> statusChangeListeners = |
| Sets.newCopyOnWriteArraySet(); |
| private final Set<Consumer<Change<Leadership>>> leadershipChangeListeners = |
| Sets.newCopyOnWriteArraySet(); |
| private final Consumer<Change<Leadership>> cacheUpdater; |
| private final Consumer<Status> statusListener; |
| |
| public static final String CHANGE_SUBJECT = "leadershipChangeEvents"; |
| private final LoadingCache<String, CompletableFuture<Leadership>> cache; |
| |
| public AtomixLeaderElector(CopycatClient client, Properties properties) { |
| super(client, properties); |
| cache = CacheBuilder.newBuilder() |
| .maximumSize(1000) |
| .build(CacheLoader.from(topic -> this.client.submit(new GetLeadership(topic)))); |
| |
| cacheUpdater = change -> { |
| Leadership leadership = change.newValue(); |
| cache.put(leadership.topic(), CompletableFuture.completedFuture(leadership)); |
| }; |
| statusListener = status -> { |
| if (status == Status.SUSPENDED || status == Status.INACTIVE) { |
| cache.invalidateAll(); |
| } |
| }; |
| addStatusChangeListener(statusListener); |
| } |
| |
| @Override |
| public CompletableFuture<Void> destroy() { |
| removeStatusChangeListener(statusListener); |
| return removeChangeListener(cacheUpdater); |
| } |
| |
| @Override |
| public String name() { |
| return null; |
| } |
| |
| @Override |
| public CompletableFuture<AtomixLeaderElector> open() { |
| return super.open().thenApply(result -> { |
| client.onEvent(CHANGE_SUBJECT, this::handleEvent); |
| return result; |
| }); |
| } |
| |
| public CompletableFuture<AtomixLeaderElector> setupCache() { |
| return addChangeListener(cacheUpdater).thenApply(v -> this); |
| } |
| |
| private void handleEvent(List<Change<Leadership>> changes) { |
| changes.forEach(change -> leadershipChangeListeners.forEach(l -> l.accept(change))); |
| } |
| |
| @Override |
| public CompletableFuture<Leadership> run(String topic, NodeId nodeId) { |
| return client.submit(new Run(topic, nodeId)).whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> withdraw(String topic) { |
| return client.submit(new Withdraw(topic)).whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> anoint(String topic, NodeId nodeId) { |
| return client.submit(new Anoint(topic, nodeId)).whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> promote(String topic, NodeId nodeId) { |
| return client.submit(new Promote(topic, nodeId)).whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> evict(NodeId nodeId) { |
| return client.submit(new AtomixLeaderElectorCommands.Evict(nodeId)); |
| } |
| |
| @Override |
| public CompletableFuture<Leadership> getLeadership(String topic) { |
| return cache.getUnchecked(topic) |
| .whenComplete((r, e) -> { |
| if (e != null) { |
| cache.invalidate(topic); |
| } |
| }); |
| } |
| |
| @Override |
| public CompletableFuture<Map<String, Leadership>> getLeaderships() { |
| return client.submit(new GetAllLeaderships()); |
| } |
| |
| public CompletableFuture<Set<String>> getElectedTopics(NodeId nodeId) { |
| return client.submit(new GetElectedTopics(nodeId)); |
| } |
| |
| @Override |
| public synchronized CompletableFuture<Void> addChangeListener(Consumer<Change<Leadership>> consumer) { |
| if (leadershipChangeListeners.isEmpty()) { |
| return client.submit(new Listen()).thenRun(() -> leadershipChangeListeners.add(consumer)); |
| } else { |
| leadershipChangeListeners.add(consumer); |
| return CompletableFuture.completedFuture(null); |
| } |
| } |
| |
| @Override |
| public synchronized CompletableFuture<Void> removeChangeListener(Consumer<Change<Leadership>> consumer) { |
| if (leadershipChangeListeners.remove(consumer) && leadershipChangeListeners.isEmpty()) { |
| return client.submit(new Unlisten()).thenApply(v -> null); |
| } |
| return CompletableFuture.completedFuture(null); |
| } |
| |
| @Override |
| public void addStatusChangeListener(Consumer<Status> listener) { |
| statusChangeListeners.add(listener); |
| } |
| |
| @Override |
| public void removeStatusChangeListener(Consumer<Status> listener) { |
| statusChangeListeners.remove(listener); |
| } |
| |
| @Override |
| public Collection<Consumer<Status>> statusChangeListeners() { |
| return ImmutableSet.copyOf(statusChangeListeners); |
| } |
| } |