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/*
* Copyright 2014 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.flow.impl;
import com.google.common.collect.ImmutableList;
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.NodeId;
import org.onosproject.cluster.RoleInfo;
import org.onosproject.event.EventDeliveryService;
import org.onosproject.event.ListenerRegistry;
import org.onosproject.mastership.MastershipEvent;
import org.onosproject.mastership.MastershipListener;
import org.onosproject.mastership.MastershipService;
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.slf4j.Logger;
import java.util.Collections;
import java.util.List;
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 implements ReplicaInfoService {
private final Logger log = getLogger(getClass());
private final MastershipListener mastershipListener = new InternalMastershipListener();
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected EventDeliveryService eventDispatcher;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected MastershipService mastershipService;
protected final ListenerRegistry<ReplicaInfoEvent, ReplicaInfoEventListener>
listenerRegistry = new ListenerRegistry<>();
@Activate
public void activate() {
eventDispatcher.addSink(ReplicaInfoEvent.class, listenerRegistry);
mastershipService.addListener(mastershipListener);
log.info("Started");
}
@Deactivate
public void deactivate() {
eventDispatcher.removeSink(ReplicaInfoEvent.class);
mastershipService.removeListener(mastershipListener);
log.info("Stopped");
}
@Override
public ReplicaInfo getReplicaInfoFor(DeviceId deviceId) {
return buildFromRoleInfo(mastershipService.getNodesFor(deviceId));
}
@Override
public void addListener(ReplicaInfoEventListener listener) {
listenerRegistry.addListener(checkNotNull(listener));
}
@Override
public void removeListener(ReplicaInfoEventListener listener) {
listenerRegistry.removeListener(checkNotNull(listener));
}
private static ReplicaInfo buildFromRoleInfo(RoleInfo roles) {
List<NodeId> backups = roles.backups() == null ?
Collections.emptyList() : ImmutableList.copyOf(roles.backups());
return new ReplicaInfo(roles.master(), backups);
}
final class InternalMastershipListener implements MastershipListener {
@Override
public void event(MastershipEvent event) {
final ReplicaInfo replicaInfo = buildFromRoleInfo(event.roleInfo());
switch (event.type()) {
case MASTER_CHANGED:
eventDispatcher.post(new ReplicaInfoEvent(MASTER_CHANGED,
event.subject(),
replicaInfo));
break;
case BACKUPS_CHANGED:
eventDispatcher.post(new ReplicaInfoEvent(BACKUPS_CHANGED,
event.subject(),
replicaInfo));
break;
default:
break;
}
}
}
}
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