/*
 * 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.cli.net;

import org.apache.karaf.shell.commands.Command;
import org.onosproject.cli.AbstractShellCommand;
import org.onosproject.cluster.Leadership;
import org.onosproject.cluster.LeadershipService;

import java.util.Map;

/**
 * Prints the leader for every topic.
 */
@Command(scope = "onos", name = "leaders",
        description = "Finds the leader for particular topic.")
public class LeaderCommand extends AbstractShellCommand {

    private static final String FMT = "%-20s: %15s %5s";

    @Override
    protected void execute() {
        LeadershipService leaderService = get(LeadershipService.class);
        Map<String, Leadership> leaderBoard = leaderService.getLeaderBoard();
        print(FMT, "Topic", "Leader", "Epoch");
        for (String topic : leaderBoard.keySet()) {
            Leadership leadership = leaderBoard.get(topic);
            print(FMT, topic, leadership.leader(), leadership.epoch());
        }
    }

}