/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.zookeeper.test;
import java.io.File;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.zookeeper.PortAssignment;
import org.apache.zookeeper.ZKTestCase;
import org.apache.zookeeper.server.quorum.LeaderElection;
import org.apache.zookeeper.server.quorum.QuorumPeer;
import org.apache.zookeeper.server.quorum.Vote;
import org.apache.zookeeper.server.quorum.QuorumPeer.QuorumServer;
import org.junit.Assert;
import org.junit.Test;
@SuppressWarnings("deprecation")
public class LETest extends ZKTestCase {
private static final Logger LOG = LoggerFactory.getLogger(LETest.class);
volatile Vote votes[];
volatile boolean leaderDies;
volatile long leader = -1;
Random rand = new Random();
class LEThread extends Thread {
LeaderElection le;
int i;
QuorumPeer peer;
LEThread(LeaderElection le, QuorumPeer peer, int i) {
this.le = le;
this.i = i;
this.peer = peer;
}
public void run() {
try {
Vote v = null;
while(true) {
v = le.lookForLeader();
votes[i] = v;
if (v.getId() == i) {
synchronized(LETest.this) {
if (leaderDies) {
leaderDies = false;
peer.stopLeaderElection();
LOG.info("Leader " + i + " dying");
leader = -2;
} else {
leader = i;
}
LETest.this.notifyAll();
}
break;
}
synchronized(LETest.this) {
if (leader == -1) {
LETest.this.wait();
}
if (leader == v.getId()) {
break;
}
}
Thread.sleep(rand.nextInt(1000));
peer.setCurrentVote(new Vote(peer.getId(), 0));
}
LOG.info("Thread " + i + " votes " + v);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
@Test
public void testLE() throws Exception {
int count = 30;
HashMap<Long,QuorumServer> peers = new HashMap<Long,QuorumServer>(count);
ArrayList<LEThread> threads = new ArrayList<LEThread>(count);
File tmpdir[] = new File[count];
int port[] = new int[count];
votes = new Vote[count];
for(int i = 0; i < count; i++) {
peers.put(Long.valueOf(i),
new QuorumServer(i,
new InetSocketAddress("127.0.0.1",
PortAssignment.unique())));
tmpdir[i] = ClientBase.createTmpDir();
port[i] = PortAssignment.unique();
}
LeaderElection le[] = new LeaderElection[count];
leaderDies = true;
boolean allowOneBadLeader = leaderDies;
for(int i = 0; i < le.length; i++) {
QuorumPeer peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i],
port[i], 0, i, 1000, 2, 2);
peer.startLeaderElection();
le[i] = new LeaderElection(peer);
LEThread thread = new LEThread(le[i], peer, i);
thread.start();
threads.add(thread);
}
for(int i = 0; i < threads.size(); i++) {
threads.get(i).join(15000);
if (threads.get(i).isAlive()) {
Assert.fail("Threads didn't join");
}
}
long id = votes[0].getId();
for(int i = 1; i < votes.length; i++) {
if (votes[i] == null) {
Assert.fail("Thread " + i + " had a null vote");
}
if (votes[i].getId() != id) {
if (allowOneBadLeader && votes[i].getId() == i) {
allowOneBadLeader = false;
} else {
Assert.fail("Thread " + i + " got " + votes[i].getId() + " expected " + id);
}
}
}
}
}