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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.googlecode.jsonrpc4j.JsonRpcServer;
import com.orbekk.same.ConnectionManagerImpl;
import com.orbekk.same.http.JettyServerBuilder;
import com.orbekk.same.http.JettyServerContainer;
import com.orbekk.same.http.RpcServlet;
public class PaxosServiceFunctionalTest {
ConnectionManagerImpl connections = new ConnectionManagerImpl(500, 500);
List<String> paxosUrls = new ArrayList<String>();
JettyServerContainer server;
String myUrl;
int successfulProposals = 0;
Runnable sleepForever = new Runnable() {
@Override public synchronized void run() {
while (!Thread.interrupted()) {
try {
wait();
} catch (InterruptedException e) {
}
}
}
};
@Before
public void setUp() throws Exception {
JettyServerBuilder builder = new JettyServerBuilder(0);
List<String> tempUrls = setupPaxos(builder, 10);
server = builder.build();
server.start();
myUrl = "http://localhost:" + server.getPort();
addUrls(tempUrls);
System.out.println(paxosUrls);
}
@After
public void tearDown() throws Exception {
server.stop();
}
public List<String> setupPaxos(JettyServerBuilder builder, int instances) {
List<String> tempUrls = new ArrayList<String>();
for (int i = 1; i <= instances; i++) {
JsonRpcServer jsonServer = new JsonRpcServer(
new PaxosServiceImpl("P" + i + ": "), PaxosService.class);
String serviceId = "/PaxosService" + i + ".json";
builder.withServlet(new RpcServlet(jsonServer), serviceId);
tempUrls.add(serviceId);
}
return tempUrls;
}
public void addUrls(List<String> services) {
for (String url : services) {
paxosUrls.add(myUrl + url);
}
}
@Test
public void testMasterElection() {
MasterProposer m1 = new MasterProposer("http://client1", paxosUrls,
connections);
assertTrue(m1.propose(1));
}
@Test
public void testMasterElectionTask() throws InterruptedException, ExecutionException {
MasterProposer m1 = new MasterProposer("http://client1", paxosUrls,
connections);
Future<Integer> result = m1.startProposalTask(1, null);
assertEquals(new Integer(1), result.get());
}
@Test
public void cancelledElection() {
MasterProposer m1 = new MasterProposer("http://client1", paxosUrls,
connections);
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("http://OnlyOneCompletes1", paxosUrls,
connections);
MasterProposer m2 = new MasterProposer("http://OnlyOneCompletes2", paxosUrls,
connections);
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() {
MasterProposer client =
new MasterProposer("http:/client" + j, paxosUrls,
connections);
if (client.proposeRetry(1)) {
incrementSuccessfulProposals();
}
}
});
}
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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