| /* |
| * 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.election; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| 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.onosproject.cluster.ClusterService; |
| import org.onosproject.core.CoreService; |
| import org.onosproject.cluster.LeadershipEvent; |
| import org.onosproject.cluster.LeadershipEventListener; |
| import org.onosproject.cluster.LeadershipService; |
| import org.onosproject.cluster.NodeId; |
| import org.onosproject.core.ApplicationId; |
| import org.slf4j.Logger; |
| |
| |
| /** |
| * Simple application to test leadership election. |
| */ |
| @Component(immediate = true) |
| public class ElectionTest { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| private static final String ELECTION_APP = "org.onosproject.election"; |
| private ApplicationId appId; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected ClusterService clusterService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected CoreService coreService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected LeadershipService leadershipService; |
| |
| private LeadershipEventListener leadershipEventListener = |
| new InnerLeadershipEventListener(); |
| |
| private NodeId localNodeId; |
| |
| |
| @Activate |
| protected void activate() { |
| log.info("Election-test app started"); |
| |
| appId = coreService.registerApplication(ELECTION_APP); |
| |
| localNodeId = clusterService.getLocalNode().id(); |
| |
| leadershipService.addListener(leadershipEventListener); |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| |
| leadershipService.withdraw(appId.name()); |
| leadershipService.removeListener(leadershipEventListener); |
| |
| log.info("Election-test app Stopped"); |
| } |
| |
| /** |
| * A listener for Leadership Events. |
| */ |
| private class InnerLeadershipEventListener |
| implements LeadershipEventListener { |
| |
| @Override |
| public void event(LeadershipEvent event) { |
| |
| |
| if (event.type().equals(LeadershipEvent.Type.CANDIDATES_CHANGED)) { |
| return; |
| } |
| if (!event.subject().topic().equals(appId.name())) { |
| return; // Not our topic: ignore |
| } |
| |
| //only log what pertains to us |
| log.debug("Leadership Event: time = {} type = {} event = {}", |
| event.time(), event.type(), event); |
| |
| switch (event.type()) { |
| case LEADER_CHANGED: |
| case LEADER_AND_CANDIDATES_CHANGED: |
| log.info("Election-test app leader changed. New leadership: {}", event.subject()); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| } |