| /* |
| * 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.cluster.impl; |
| |
| import static org.onlab.util.Tools.groupedThreads; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.function.Consumer; |
| |
| import com.google.common.collect.Maps; |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.felix.scr.annotations.Service; |
| import org.onosproject.cluster.ClusterService; |
| import org.onosproject.cluster.Leadership; |
| import org.onosproject.cluster.LeadershipEvent; |
| import org.onosproject.cluster.LeadershipStore; |
| import org.onosproject.cluster.LeadershipStoreDelegate; |
| import org.onosproject.cluster.NodeId; |
| import org.onosproject.event.Change; |
| import org.onosproject.store.AbstractStore; |
| import org.onosproject.store.service.DistributedPrimitive.Status; |
| import org.onosproject.store.service.LeaderElector; |
| import org.onosproject.store.service.StorageService; |
| import org.slf4j.Logger; |
| |
| /** |
| * Implementation of {@code LeadershipStore} that makes use of a {@link LeaderElector} |
| * primitive. |
| */ |
| @Service |
| @Component(immediate = true) |
| public class DistributedLeadershipStore |
| extends AbstractStore<LeadershipEvent, LeadershipStoreDelegate> |
| implements LeadershipStore { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected ClusterService clusterService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected StorageService storageService; |
| |
| private ExecutorService statusChangeHandler; |
| private NodeId localNodeId; |
| private LeaderElector leaderElector; |
| private final Map<String, Leadership> localLeaderCache = Maps.newConcurrentMap(); |
| |
| private final Consumer<Change<Leadership>> leadershipChangeListener = |
| change -> { |
| Leadership oldValue = change.oldValue(); |
| Leadership newValue = change.newValue(); |
| boolean leaderChanged = !Objects.equals(oldValue.leader(), newValue.leader()); |
| boolean candidatesChanged = !Objects.equals(oldValue.candidates(), newValue.candidates()); |
| LeadershipEvent.Type eventType = null; |
| if (leaderChanged && candidatesChanged) { |
| eventType = LeadershipEvent.Type.LEADER_AND_CANDIDATES_CHANGED; |
| } |
| if (leaderChanged && !candidatesChanged) { |
| eventType = LeadershipEvent.Type.LEADER_CHANGED; |
| } |
| if (!leaderChanged && candidatesChanged) { |
| eventType = LeadershipEvent.Type.CANDIDATES_CHANGED; |
| } |
| notifyDelegate(new LeadershipEvent(eventType, change.newValue())); |
| // Update local cache of currently held leaderships |
| if (Objects.equals(newValue.leaderNodeId(), localNodeId)) { |
| localLeaderCache.put(newValue.topic(), newValue); |
| } else { |
| localLeaderCache.remove(newValue.topic()); |
| } |
| }; |
| |
| private final Consumer<Status> clientStatusListener = status -> |
| statusChangeHandler.execute(() -> handleStatusChange(status)); |
| |
| private void handleStatusChange(Status status) { |
| // Notify mastership Service of disconnect and reconnect |
| if (status == Status.ACTIVE) { |
| // Service Restored |
| localLeaderCache.forEach((topic, leadership) -> leaderElector.run(topic, localNodeId)); |
| leaderElector.getLeaderships().forEach((topic, leadership) -> |
| notifyDelegate(new LeadershipEvent(LeadershipEvent.Type.SERVICE_RESTORED, leadership))); |
| } else if (status == Status.SUSPENDED) { |
| // Service Suspended |
| localLeaderCache.forEach((topic, leadership) -> |
| notifyDelegate(new LeadershipEvent(LeadershipEvent.Type.SERVICE_DISRUPTED, leadership))); |
| } else { |
| // Should be only inactive state |
| return; |
| } |
| } |
| |
| |
| @Activate |
| public void activate() { |
| statusChangeHandler = Executors.newSingleThreadExecutor( |
| groupedThreads("onos/store/dist/cluster/leadership", "status-change-handler", log)); |
| localNodeId = clusterService.getLocalNode().id(); |
| leaderElector = storageService.leaderElectorBuilder() |
| .withName("onos-leadership-elections") |
| .build() |
| .asLeaderElector(); |
| leaderElector.addChangeListener(leadershipChangeListener); |
| leaderElector.addStatusChangeListener(clientStatusListener); |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| leaderElector.removeChangeListener(leadershipChangeListener); |
| leaderElector.removeStatusChangeListener(clientStatusListener); |
| statusChangeHandler.shutdown(); |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public Leadership addRegistration(String topic) { |
| return leaderElector.run(topic, localNodeId); |
| } |
| |
| @Override |
| public void removeRegistration(String topic) { |
| leaderElector.withdraw(topic); |
| } |
| |
| @Override |
| public void removeRegistration(NodeId nodeId) { |
| leaderElector.evict(nodeId); |
| } |
| |
| @Override |
| public boolean moveLeadership(String topic, NodeId toNodeId) { |
| return leaderElector.anoint(topic, toNodeId); |
| } |
| |
| @Override |
| public boolean makeTopCandidate(String topic, NodeId nodeId) { |
| return leaderElector.promote(topic, nodeId); |
| } |
| |
| @Override |
| public Leadership getLeadership(String topic) { |
| return leaderElector.getLeadership(topic); |
| } |
| |
| @Override |
| public Map<String, Leadership> getLeaderships() { |
| return leaderElector.getLeaderships(); |
| } |
| } |