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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.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.ControllerNode;
import org.onosproject.cluster.LeadershipEvent;
import org.onosproject.cluster.LeadershipEventListener;
import org.onosproject.cluster.LeadershipService;
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 ControllerNode localControllerNode;
@Activate
protected void activate() {
log.info("Election-test app started");
appId = coreService.registerApplication(ELECTION_APP);
localControllerNode = clusterService.getLocalNode();
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);
if (!event.subject().leader().equals(
localControllerNode.id())) {
return; // The event is not about this instance: ignore
}
switch (event.type()) {
case LEADER_ELECTED:
log.info("Election-test app leader elected");
break;
case LEADER_BOOTED:
log.info("Election-test app lost election");
break;
case LEADER_REELECTED:
log.debug("Election-test app was re-elected");
break;
default:
break;
}
}
}
}
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