| /* |
| * 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.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| 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.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.felix.scr.annotations.Service; |
| import org.onosproject.cluster.ClusterService; |
| import org.onosproject.cluster.Leader; |
| 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 NodeId localNodeId; |
| |
| private Map<String, Boolean> elections = new ConcurrentHashMap<>(); |
| |
| @Activate |
| public void activate() { |
| localNodeId = clusterService.getLocalNode().id(); |
| } |
| |
| @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, new Leader(localNodeId, 0, 0), Arrays.asList(localNodeId)) : 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 Leadership runForLeadership(String path) { |
| elections.put(path, true); |
| Leadership leadership = new Leadership(path, new Leader(localNodeId, 0, 0), Arrays.asList(localNodeId)); |
| for (LeadershipEventListener listener : listeners) { |
| listener.event(new LeadershipEvent(Type.LEADER_AND_CANDIDATES_CHANGED, leadership)); |
| } |
| return leadership; |
| } |
| |
| @Override |
| public void withdraw(String path) { |
| elections.remove(path); |
| for (LeadershipEventListener listener : listeners) { |
| listener.event(new LeadershipEvent(Type.LEADER_AND_CANDIDATES_CHANGED, |
| new Leadership(path, null, Arrays.asList()))); |
| } |
| } |
| |
| @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; |
| } |
| } |