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/**
* Copyright 2012 Kjetil Ørbekk <kjetil.orbekk@gmail.com>
*
* 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 com.orbekk.paxos;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.orbekk.protobuf.SimpleProtobufServer;
import com.orbekk.same.ConnectionManagerImpl;
import com.orbekk.same.RpcFactory;
import com.orbekk.same.Services.ClientState;
public class PaxosServiceFunctionalTest {
ConnectionManagerImpl connections = new ConnectionManagerImpl(500, 500);
List<String> paxosUrls = new ArrayList<String>();
List<SimpleProtobufServer> servers = new ArrayList<SimpleProtobufServer>();
RpcFactory rpcf = new RpcFactory(5000);
String myUrl;
int successfulProposals = 0;
ClientState client1 = ClientState.newBuilder()
.setLocation("client1Location")
.build();
Runnable sleepForever = new Runnable() {
@Override public synchronized void run() {
while (!Thread.interrupted()) {
try {
wait();
} catch (InterruptedException e) {
}
}
}
};
@Before
public void setUp() throws Exception {
for (int i = 0; i < 11; i++) {
setupPaxos(i);
}
}
@After
public void tearDown() throws Exception {
for (SimpleProtobufServer server : servers) {
server.interrupt();
}
}
public void setupPaxos(int i) {
SimpleProtobufServer server = SimpleProtobufServer.create(0);
server.registerService(new PaxosServiceImpl("P: " + i + ": ").getService());
server.start();
servers.add(server);
String location = "localhost:" + server.getPort();
paxosUrls.add(location);
}
public void addUrls(List<String> services) {
for (String url : services) {
paxosUrls.add(myUrl + url);
}
}
@Test
public void testMasterElection() throws InterruptedException {
MasterProposer m1 = new MasterProposer(client1, paxosUrls,
connections, rpcf);
assertTrue(m1.propose(1));
}
@Test
public void testMasterElectionTask() throws InterruptedException, ExecutionException {
MasterProposer m1 = new MasterProposer(client1, paxosUrls,
connections, rpcf);
Future<Integer> result = m1.startProposalTask(1, null);
assertEquals(new Integer(1), result.get());
}
@Test
public void cancelledElection() throws InterruptedException {
MasterProposer m1 = new MasterProposer(client1, paxosUrls,
connections, rpcf);
assertTrue(m1.propose(1));
Future<Integer> result = m1.startProposalTask(1, sleepForever);
result.cancel(true);
assertTrue(result.isCancelled());
}
@Test
public void testOnlyOneCompletes() throws InterruptedException, ExecutionException {
MasterProposer m1 = new MasterProposer(client1, paxosUrls,
connections, rpcf);
ClientState client2 = ClientState.newBuilder().setLocation("client2").build();
MasterProposer m2 = new MasterProposer(client2, paxosUrls,
connections, rpcf);
final Future<Integer> result1 = m1.startProposalTask(1, sleepForever);
final Future<Integer> result2 = m2.startProposalTask(1, sleepForever);
Thread t1 = new Thread(new Runnable() {
@Override public void run() {
try {
result1.get();
result2.cancel(true);
} catch (CancellationException e) {
} catch (InterruptedException e) {
} catch (ExecutionException e) {
}
}
});
Thread t2 = new Thread(new Runnable() {
@Override public void run() {
try {
result2.get();
result1.cancel(true);
} catch (CancellationException e) {
} catch (InterruptedException e) {
} catch (ExecutionException e) {
}
}
});
t1.start();
t2.start();
try {
t1.join();
} catch (InterruptedException e) {
}
try {
t2.join();
} catch (InterruptedException e) {
}
assertTrue(result1.isCancelled() || result2.isCancelled());
if (!result1.isCancelled()) {
assertEquals(new Integer(1), result1.get());
}
if (!result2.isCancelled()) {
assertEquals(new Integer(1), result2.get());
}
}
@Test
public void testWithCompetition() {
int proposers = 5;
List<Thread> masterProposers = new ArrayList<Thread>();
for (int i = 1; i <= proposers; i++) {
final int j = i;
masterProposers.add(new Thread() {
@Override public void run() {
ClientState client = ClientState.newBuilder()
.setLocation("client" + j)
.build();
MasterProposer proposer =
new MasterProposer(client, paxosUrls,
connections, rpcf);
try {
if (proposer.proposeRetry(1)) {
incrementSuccessfulProposals();
}
} catch (InterruptedException e) {
}
}
});
}
for (Thread t : masterProposers) {
t.start();
}
for (Thread t : masterProposers) {
try {
t.join();
} catch (InterruptedException e) {
// Ignore.
}
}
assertEquals(5, successfulProposals);
}
public synchronized void incrementSuccessfulProposals() {
successfulProposals += 1;
}
}
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