LeaderCommand.java
3.76 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
/*
* 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);
}
}
}