/**
* 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.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 FLENewEpochTest extends ZKTestCase {
protected static final Logger LOG = LoggerFactory.getLogger(FLENewEpochTest.class);
int count;
HashMap<Long,QuorumServer> peers;
ArrayList<LEThread> threads;
File tmpdir[];
int port[];
volatile int [] round;
Semaphore start0;
Semaphore finish3, finish0;
@Before
public void setUp() throws Exception {
count = 3;
peers = new HashMap<Long,QuorumServer>(count);
threads = new ArrayList<LEThread>(count);
tmpdir = new File[count];
port = new int[count];
round = new int[3];
round[0] = 0;
round[1] = 0;
round[2] = 0;
start0 = new Semaphore(0);
finish0 = new Semaphore(0);
finish3 = new Semaphore(0);
}
@After
public void tearDown() throws Exception {
for(int i = 0; i < threads.size(); i++) {
((FastLeaderElection) threads.get(i).peer.getElectionAlg()).shutdown();
}
}
class LEThread extends Thread {
int i;
QuorumPeer peer;
LEThread(QuorumPeer peer, int i) {
this.i = i;
this.peer = peer;
LOG.info("Constructor: " + getName());
}
public void run(){
boolean flag = true;
try{
while(flag){
Vote v = null;
peer.setPeerState(ServerState.LOOKING);
LOG.info("Going to call leader election again: " + i);
v = peer.getElectionAlg().lookForLeader();
if (v == null){
Assert.fail("Thread " + i + " got a null vote");
}
/*
* 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:
LOG.info("First peer, do nothing, just join");
if(finish0.tryAcquire(1000, java.util.concurrent.TimeUnit.MILLISECONDS)){
//if(threads.get(0).peer.getPeerState() == ServerState.LEADING ){
LOG.info("Setting flag to false");
flag = false;
}
break;
case 1:
LOG.info("Second entering case");
if(round[1] != 0){
finish0.release();
flag = false;
} else {
finish3.acquire();
start0.release();
}
LOG.info("Second is going to start second round");
round[1]++;
break;
case 2:
LOG.info("Third peer, shutting it down");
QuorumBase.shutdown(peer);
flag = false;
round[2] = 1;
finish3.release();
LOG.info("Third leaving");
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Test
public void testLENewEpoch() throws Exception {
FastLeaderElection le[] = new FastLeaderElection[count];
LOG.info("TestLE: " + getTestName()+ ", " + count);
for(int i = 0; i < count; i++) {
peers.put(Long.valueOf(i),
new QuorumServer(i,
new InetSocketAddress(PortAssignment.unique()),
new InetSocketAddress(PortAssignment.unique())));
tmpdir[i] = ClientBase.createTmpDir();
port[i] = PortAssignment.unique();
}
for(int i = 1; i < le.length; i++) {
QuorumPeer peer = new QuorumPeer(peers, tmpdir[i], tmpdir[i], port[i], 3, i, 1000, 2, 2);
peer.startLeaderElection();
LEThread thread = new LEThread(peer, i);
thread.start();
threads.add(thread);
}
if(!start0.tryAcquire(4000, java.util.concurrent.TimeUnit.MILLISECONDS))
Assert.fail("First leader election failed");
QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 1000, 2, 2);
peer.startLeaderElection();
LEThread thread = new LEThread(peer, 0);
thread.start();
threads.add(thread);
LOG.info("Started threads " + getTestName());
for(int i = 0; i < threads.size(); i++) {
threads.get(i).join(10000);
if (threads.get(i).isAlive()) {
Assert.fail("Threads didn't join");
}
}
}
}