| /* |
| * 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 java.util.Comparator; |
| import java.util.Map; |
| |
| import org.apache.karaf.shell.commands.Command; |
| import org.onlab.util.Tools; |
| import org.onosproject.cli.AbstractShellCommand; |
| import org.onosproject.cluster.Leadership; |
| import org.onosproject.cluster.LeadershipService; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| |
| /** |
| * 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 | %-6s | %-10s |"; |
| |
| /** |
| * Compares leaders, sorting by toString() output. |
| */ |
| private Comparator<Leadership> leadershipComparator = |
| (e1, e2) -> { |
| if (e1.leader() == null && e2.leader() == null) { |
| return 0; |
| } |
| if (e1.leader() == null) { |
| return 1; |
| } |
| if (e2.leader() == null) { |
| return -1; |
| } |
| return e1.leader().toString().compareTo(e2.leader().toString()); |
| }; |
| |
| /** |
| * Displays text representing the leaders. |
| * |
| * @param leaderBoard map of leaders |
| */ |
| private void displayLeaders(Map<String, Leadership> leaderBoard) { |
| print("--------------------------------------------------------------"); |
| print(FMT, "Topic", "Leader", "Epoch", "Elected"); |
| print("--------------------------------------------------------------"); |
| |
| leaderBoard.values() |
| .stream() |
| .sorted(leadershipComparator) |
| .forEach(l -> print(FMT, |
| l.topic(), |
| l.leader(), |
| l.epoch(), |
| Tools.timeAgo(l.electedTime()))); |
| print("--------------------------------------------------------------"); |
| } |
| |
| /** |
| * Returns JSON node representing the leaders. |
| * |
| * @param leaderBoard map of leaders |
| */ |
| private JsonNode json(Map<String, Leadership> leaderBoard) { |
| ObjectMapper mapper = new ObjectMapper(); |
| ArrayNode result = mapper.createArrayNode(); |
| leaderBoard.values() |
| .stream() |
| .sorted(leadershipComparator) |
| .forEach(l -> |
| result.add( |
| mapper.createObjectNode() |
| .put("topic", l.topic()) |
| .put("leader", l.leader().toString()) |
| .put("epoch", l.epoch()) |
| .put("electedTime", Tools.timeAgo(l.electedTime())))); |
| |
| return result; |
| } |
| |
| |
| @Override |
| protected void execute() { |
| LeadershipService leaderService = get(LeadershipService.class); |
| Map<String, Leadership> leaderBoard = leaderService.getLeaderBoard(); |
| |
| if (outputJson()) { |
| print("%s", json(leaderBoard)); |
| } else { |
| displayLeaders(leaderBoard); |
| } |
| } |
| } |