| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * 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 java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.function.Consumer; |
| |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.common.collect.Sets; |
| import io.atomix.protocols.raft.proxy.RaftProxy; |
| import org.onlab.util.KryoNamespace; |
| import org.onosproject.cluster.Leadership; |
| import org.onosproject.cluster.NodeId; |
| import org.onosproject.event.Change; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Anoint; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GetElectedTopics; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GetLeadership; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Promote; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Run; |
| import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Withdraw; |
| import org.onosproject.store.serializers.KryoNamespaces; |
| import org.onosproject.store.service.AsyncLeaderElector; |
| import org.onosproject.store.service.Serializer; |
| |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorEvents.CHANGE; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.ADD_LISTENER; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.ANOINT; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.EVICT; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GET_ALL_LEADERSHIPS; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GET_ELECTED_TOPICS; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GET_LEADERSHIP; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.PROMOTE; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.REMOVE_LISTENER; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.RUN; |
| import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.WITHDRAW; |
| |
| /** |
| * Distributed resource providing the {@link AsyncLeaderElector} primitive. |
| */ |
| public class AtomixLeaderElector extends AbstractRaftPrimitive implements AsyncLeaderElector { |
| private static final Serializer SERIALIZER = Serializer.using(KryoNamespace.newBuilder() |
| .register(KryoNamespaces.API) |
| .register(AtomixLeaderElectorOperations.NAMESPACE) |
| .register(AtomixLeaderElectorEvents.NAMESPACE) |
| .build()); |
| |
| private final Set<Consumer<Change<Leadership>>> leadershipChangeListeners = Sets.newCopyOnWriteArraySet(); |
| private final Consumer<Change<Leadership>> cacheUpdater; |
| private final Consumer<Status> statusListener; |
| |
| private final LoadingCache<String, CompletableFuture<Leadership>> cache; |
| |
| public AtomixLeaderElector(RaftProxy proxy) { |
| super(proxy); |
| cache = CacheBuilder.newBuilder() |
| .maximumSize(1000) |
| .build(CacheLoader.from(topic -> proxy.invoke( |
| GET_LEADERSHIP, SERIALIZER::encode, new GetLeadership(topic), SERIALIZER::decode))); |
| |
| 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); |
| |
| proxy.addStateChangeListener(state -> { |
| if (state == RaftProxy.State.CONNECTED && isListening()) { |
| proxy.invoke(ADD_LISTENER); |
| } |
| }); |
| proxy.addEventListener(CHANGE, SERIALIZER::decode, this::handleEvent); |
| } |
| |
| @Override |
| public CompletableFuture<Void> destroy() { |
| removeStatusChangeListener(statusListener); |
| return removeChangeListener(cacheUpdater); |
| } |
| |
| 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 proxy.<Run, Leadership>invoke(RUN, SERIALIZER::encode, new Run(topic, nodeId), SERIALIZER::decode) |
| .whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> withdraw(String topic) { |
| return proxy.invoke(WITHDRAW, SERIALIZER::encode, new Withdraw(topic)) |
| .whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> anoint(String topic, NodeId nodeId) { |
| return proxy.<Anoint, Boolean>invoke(ANOINT, SERIALIZER::encode, new Anoint(topic, nodeId), SERIALIZER::decode) |
| .whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> promote(String topic, NodeId nodeId) { |
| return proxy.<Promote, Boolean>invoke( |
| PROMOTE, SERIALIZER::encode, new Promote(topic, nodeId), SERIALIZER::decode) |
| .whenComplete((r, e) -> cache.invalidate(topic)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> evict(NodeId nodeId) { |
| return proxy.invoke(EVICT, SERIALIZER::encode, new AtomixLeaderElectorOperations.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 proxy.invoke(GET_ALL_LEADERSHIPS, SERIALIZER::decode); |
| } |
| |
| public CompletableFuture<Set<String>> getElectedTopics(NodeId nodeId) { |
| return proxy.invoke(GET_ELECTED_TOPICS, SERIALIZER::encode, new GetElectedTopics(nodeId), SERIALIZER::decode); |
| } |
| |
| @Override |
| public synchronized CompletableFuture<Void> addChangeListener(Consumer<Change<Leadership>> consumer) { |
| if (leadershipChangeListeners.isEmpty()) { |
| return proxy.invoke(ADD_LISTENER).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 proxy.invoke(REMOVE_LISTENER).thenApply(v -> null); |
| } |
| return CompletableFuture.completedFuture(null); |
| } |
| |
| private boolean isListening() { |
| return !leadershipChangeListeners.isEmpty(); |
| } |
| } |