/**
* 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.HashSet;
import java.util.Random;
import java.util.concurrent.Semaphore;
import junit.framework.TestCase;
import org.apache.log4j.Logger;
import org.apache.zookeeper.server.quorum.FastLeaderElection;
import org.apache.zookeeper.server.quorum.QuorumPeer;
import org.apache.zookeeper.server.quorum.Vote;
import org.apache.zookeeper.server.quorum.QuorumPeer.QuorumServer;
import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState;
import org.junit.Test;
public class FLERestartTest extends TestCase {
protected static final Logger LOG = Logger.getLogger(FLETest.class);
static class TestVote {
TestVote(int id, long leader) {
this.leader = leader;
}
long leader;
}
int countVotes(HashSet<TestVote> hs, long id) {
int counter = 0;
for(TestVote v : hs){
if(v.leader == id) counter++;
}
return counter;
}
int count;
int baseport;
int baseLEport;
HashMap<Long,QuorumServer> peers;
ArrayList<FLERestartThread> restartThreads;
HashMap<Integer, HashSet<TestVote> > voteMap;
File tmpdir[];
int port[];
int successCount;
Semaphore finish;
volatile Vote votes[];
volatile boolean leaderDies;
volatile long leader = -1;
//volatile int round = 1;
Random rand = new Random();
@Override
public void setUp() throws Exception {
count = 3;
baseport= 33003;
baseLEport = 43003;
peers = new HashMap<Long,QuorumServer>(count);
restartThreads = new ArrayList<FLERestartThread>(count);
voteMap = new HashMap<Integer, HashSet<TestVote> >();
votes = new Vote[count];
tmpdir = new File[count];
port = new int[count];
successCount = 0;
finish = new Semaphore(0);
LOG.info("SetUp " + getName());
}
@Override
public void tearDown() throws Exception {
for(int i = 0; i < restartThreads.size(); i++) {
((FastLeaderElection) restartThreads.get(i).peer.getElectionAlg()).shutdown();
}
LOG.info("FINISHED " + getName());
}
class FLERestartThread extends Thread {
int i;
QuorumPeer peer;
int peerRound = 0;
FLERestartThread(QuorumPeer peer, int i) {
this.i = i;
this.peer = peer;
LOG.info("Constructor: " + getName());
}
public void run() {
try {
Vote v = null;
while(true) {
peer.setPeerState(ServerState.LOOKING);
LOG.info("Going to call leader election again.");
v = peer.getElectionAlg().lookForLeader();
if(v == null){
LOG.info("Thread " + i + " got a null vote");
break;
}
/*
* A real zookeeper would take care of setting the current vote. Here
* we do it manually.
*/
peer.setCurrentVote(v);
LOG.info("Finished election: " + i + ", " + v.id);
//votes[i] = v;
switch(i){
case 0:
if(peerRound == 0){
LOG.info("First peer, shutting it down");
peer.shutdown();
((FastLeaderElection) restartThreads.get(i).peer.getElectionAlg()).shutdown();
peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i], port[i], 3, i, 2, 2, 2);
peer.startLeaderElection();
peerRound++;
} else {
finish.release(2);
return;
}
break;
case 1:
LOG.info("Second entering case");
finish.acquire();
//if(threads.get(0).peer.getPeerState() == ServerState.LEADING ){
LOG.info("Release");
return;
case 2:
LOG.info("First peer, do nothing, just join");
finish.acquire();
//if(threads.get(0).peer.getPeerState() == ServerState.LEADING ){
LOG.info("Release");
return;
}
}
} catch (Exception e){
e.printStackTrace();
}
}
}
@Test
public void testLERestart() throws Exception {
FastLeaderElection le[] = new FastLeaderElection[count];
leaderDies = true;
boolean allowOneBadLeader = leaderDies;
LOG.info("TestLE: " + getName()+ ", " + count);
for(int i = 0; i < count; i++) {
peers.put(Long.valueOf(i), new QuorumServer(i, new InetSocketAddress(baseport+100+i),
new InetSocketAddress(baseLEport+100+i)));
tmpdir[i] = ClientBase.createTmpDir();
port[i] = baseport+i;
}
for(int i = 0; i < count; i++) {
QuorumPeer peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i], port[i], 3, i, 2, 2, 2);
peer.startLeaderElection();
FLERestartThread thread = new FLERestartThread(peer, i);
thread.start();
restartThreads.add(thread);
}
LOG.info("Started threads " + getName());
for(int i = 0; i < restartThreads.size(); i++) {
restartThreads.get(i).join(10000);
if (restartThreads.get(i).isAlive()) {
fail("Threads didn't join");
}
}
}
}