/**
* 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.concurrent.Semaphore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.zookeeper.PortAssignment;
import org.apache.zookeeper.ZKTestCase;
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.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class FLERestartTest extends ZKTestCase {
protected static final Logger LOG = LoggerFactory.getLogger(FLETest.class);
private int count;
private HashMap<Long,QuorumServer> peers;
private ArrayList<FLERestartThread> restartThreads;
private File tmpdir[];
private int port[];
private Semaphore finish;
static class TestVote {
long leader;
TestVote(int id, long leader) {
this.leader = leader;
}
}
int countVotes(HashSet<TestVote> hs, long id) {
int counter = 0;
for(TestVote v : hs){
if(v.leader == id) counter++;
}
return counter;
}
@Before
public void setUp() throws Exception {
count = 3;
peers = new HashMap<Long,QuorumServer>(count);
restartThreads = new ArrayList<FLERestartThread>(count);
tmpdir = new File[count];
port = new int[count];
finish = new Semaphore(0);
}
@After
public void tearDown() throws Exception {
for(int i = 0; i < restartThreads.size(); i++) {
((FastLeaderElection) restartThreads.get(i).peer.getElectionAlg()).shutdown();
}
}
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.getId());
//votes[i] = v;
switch(i){
case 0:
if(peerRound == 0){
LOG.info("First peer, shutting it down");
QuorumBase.shutdown(peer);
((FastLeaderElection) restartThreads.get(i).peer.getElectionAlg()).shutdown();
peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i], port[i], 3, i, 1000, 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 {
LOG.info("TestLE: " + getTestName()+ ", " + count);
for(int i = 0; i < count; i++) {
peers.put(Long.valueOf(i),
new QuorumServer(i,
new InetSocketAddress(
"127.0.0.1", PortAssignment.unique()),
new InetSocketAddress(
"127.0.0.1", PortAssignment.unique())));
tmpdir[i] = ClientBase.createTmpDir();
port[i] = PortAssignment.unique();
}
for(int i = 0; i < count; i++) {
QuorumPeer peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i], port[i], 3, i, 1000, 2, 2);
peer.startLeaderElection();
FLERestartThread thread = new FLERestartThread(peer, i);
thread.start();
restartThreads.add(thread);
}
LOG.info("Started threads " + getTestName());
for(int i = 0; i < restartThreads.size(); i++) {
restartThreads.get(i).join(10000);
if (restartThreads.get(i).isAlive()) {
Assert.fail("Threads didn't join");
}
}
}
}