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/*
* Copyright 2014-2015 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.trivial;
import static com.google.common.base.Preconditions.checkArgument;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.stream.Collectors;
import org.apache.felix.scr.annotations.Component;
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.LeadershipEvent.Type;
import org.onosproject.cluster.LeadershipEventListener;
import org.onosproject.cluster.LeadershipService;
import org.onosproject.cluster.NodeId;
/**
* A trivial implementation of the leadership service.
* <p>
* The service is not distributed, so it can assume there's a single leadership
* contender. This contender is always granted leadership whenever it asks.
*/
@Component(immediate = true)
@Service
public class SimpleLeadershipManager implements LeadershipService {
private Set<LeadershipEventListener> listeners = new CopyOnWriteArraySet<>();
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
private ClusterService clusterService;
private Map<String, Boolean> elections = new ConcurrentHashMap<>();
@Override
public NodeId getLeader(String path) {
return elections.get(path) ? clusterService.getLocalNode().id() : null;
}
@Override
public Leadership getLeadership(String path) {
checkArgument(path != null);
return elections.get(path) ? new Leadership(path, clusterService.getLocalNode().id(), 0, 0) : null;
}
@Override
public Set<String> ownedTopics(NodeId nodeId) {
checkArgument(nodeId != null);
return elections.entrySet()
.stream()
.filter(Entry::getValue)
.map(Entry::getKey)
.collect(Collectors.toSet());
}
@Override
public CompletableFuture<Leadership> runForLeadership(String path) {
elections.put(path, true);
for (LeadershipEventListener listener : listeners) {
listener.event(new LeadershipEvent(Type.LEADER_ELECTED,
new Leadership(path, clusterService.getLocalNode().id(), 0, 0)));
}
return CompletableFuture.completedFuture(new Leadership(path, clusterService.getLocalNode().id(), 0, 0));
}
@Override
public CompletableFuture<Void> withdraw(String path) {
elections.remove(path);
for (LeadershipEventListener listener : listeners) {
listener.event(new LeadershipEvent(Type.LEADER_BOOTED,
new Leadership(path, clusterService.getLocalNode().id(), 0, 0)));
}
return CompletableFuture.completedFuture(null);
}
@Override
public Map<String, Leadership> getLeaderBoard() {
//FIXME
throw new UnsupportedOperationException("I don't know what to do." +
" I wish you luck.");
}
@Override
public void addListener(LeadershipEventListener listener) {
listeners.add(listener);
}
@Override
public void removeListener(LeadershipEventListener listener) {
listeners.remove(listener);
}
@Override
public Map<String, List<NodeId>> getCandidates() {
return null;
}
@Override
public List<NodeId> getCandidates(String path) {
return null;
}
@Override
public boolean stepdown(String path) {
throw new UnsupportedOperationException();
}
@Override
public boolean makeTopCandidate(String path, NodeId nodeId) {
throw new UnsupportedOperationException();
}
}
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