| /* |
| * Copyright 2014-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.flow.impl; |
| |
| import java.util.Objects; |
| import java.util.function.Consumer; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import java.util.stream.Collectors; |
| |
| 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.Leadership; |
| import org.onosproject.core.VersionService; |
| import org.onosproject.event.AbstractListenerManager; |
| import org.onosproject.event.Change; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.store.flow.ReplicaInfo; |
| import org.onosproject.store.flow.ReplicaInfoEvent; |
| import org.onosproject.store.flow.ReplicaInfoEventListener; |
| import org.onosproject.store.flow.ReplicaInfoService; |
| import org.onosproject.store.service.CoordinationService; |
| import org.onosproject.store.service.LeaderElector; |
| import org.slf4j.Logger; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.onosproject.store.flow.ReplicaInfoEvent.Type.BACKUPS_CHANGED; |
| import static org.onosproject.store.flow.ReplicaInfoEvent.Type.MASTER_CHANGED; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Manages replica placement information. |
| */ |
| @Component(immediate = true) |
| @Service |
| public class ReplicaInfoManager |
| extends AbstractListenerManager<ReplicaInfoEvent, ReplicaInfoEventListener> |
| implements ReplicaInfoService { |
| |
| private static final Pattern DEVICE_MASTERSHIP_TOPIC_PATTERN = Pattern.compile("device:([^|]+)\\|[^|]+"); |
| |
| private final Logger log = getLogger(getClass()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected CoordinationService coordinationService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected VersionService versionService; |
| |
| private final Consumer<Change<Leadership>> leadershipChangeListener = change -> { |
| Leadership oldLeadership = change.oldValue(); |
| Leadership newLeadership = change.newValue(); |
| |
| String topic = newLeadership.topic(); |
| if (!isDeviceMastershipTopic(topic)) { |
| return; |
| } |
| |
| DeviceId deviceId = extractDeviceIdFromTopic(topic); |
| ReplicaInfo replicaInfo = buildFromLeadership(newLeadership); |
| |
| boolean leaderChanged = !Objects.equals(oldLeadership.leader(), newLeadership.leader()); |
| boolean candidatesChanged = !Objects.equals(oldLeadership.candidates(), newLeadership.candidates()); |
| |
| if (leaderChanged) { |
| post(new ReplicaInfoEvent(MASTER_CHANGED, deviceId, replicaInfo)); |
| } |
| if (candidatesChanged) { |
| post(new ReplicaInfoEvent(BACKUPS_CHANGED, deviceId, replicaInfo)); |
| } |
| }; |
| |
| private LeaderElector leaderElector; |
| |
| @Activate |
| public void activate() { |
| eventDispatcher.addSink(ReplicaInfoEvent.class, listenerRegistry); |
| leaderElector = coordinationService.leaderElectorBuilder() |
| .withName("onos-leadership-elections") |
| .build() |
| .asLeaderElector(); |
| leaderElector.addChangeListener(leadershipChangeListener); |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| eventDispatcher.removeSink(ReplicaInfoEvent.class); |
| leaderElector.removeChangeListener(leadershipChangeListener); |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public ReplicaInfo getReplicaInfoFor(DeviceId deviceId) { |
| return buildFromLeadership(leaderElector.getLeadership(createDeviceMastershipTopic(deviceId))); |
| } |
| |
| @Override |
| public void addListener(ReplicaInfoEventListener listener) { |
| listenerRegistry.addListener(checkNotNull(listener)); |
| } |
| |
| @Override |
| public void removeListener(ReplicaInfoEventListener listener) { |
| listenerRegistry.removeListener(checkNotNull(listener)); |
| } |
| |
| String createDeviceMastershipTopic(DeviceId deviceId) { |
| return String.format("device:%s|%s", deviceId.toString(), versionService.version()); |
| } |
| |
| DeviceId extractDeviceIdFromTopic(String topic) { |
| Matcher m = DEVICE_MASTERSHIP_TOPIC_PATTERN.matcher(topic); |
| if (m.matches()) { |
| return DeviceId.deviceId(m.group(1)); |
| } else { |
| throw new IllegalArgumentException("Invalid device mastership topic: " + topic); |
| } |
| } |
| |
| boolean isDeviceMastershipTopic(String topic) { |
| Matcher m = DEVICE_MASTERSHIP_TOPIC_PATTERN.matcher(topic); |
| return m.matches(); |
| } |
| |
| static ReplicaInfo buildFromLeadership(Leadership leadership) { |
| return new ReplicaInfo(leadership.leaderNodeId(), leadership.candidates().stream() |
| .filter(nodeId -> !Objects.equals(nodeId, leadership.leaderNodeId())) |
| .collect(Collectors.toList())); |
| } |
| } |