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ConnectionPoolTest.java
520 lines (464 loc) · 19.5 KB
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ConnectionPoolTest.java
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//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.client;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.api.Destination;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.http.HttpClientTransportOverHTTP;
import org.eclipse.jetty.client.util.BytesContentProvider;
import org.eclipse.jetty.client.util.FutureResponseListener;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpMethod;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.util.IO;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.SocketAddressResolver;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
import org.hamcrest.Matchers;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class ConnectionPoolTest
{
private Server server;
private ServerConnector connector;
private HttpClient client;
public static Stream<ConnectionPoolFactory> pools()
{
return Stream.concat(poolsNoRoundRobin(),
Stream.of(new ConnectionPoolFactory("round-robin", destination -> new RoundRobinConnectionPool(destination, destination.getHttpClient().getMaxConnectionsPerDestination(), destination))));
}
public static Stream<ConnectionPoolFactory> poolsNoRoundRobin()
{
return Stream.of(
new ConnectionPoolFactory("duplex", destination -> new DuplexConnectionPool(destination, destination.getHttpClient().getMaxConnectionsPerDestination(), destination)),
new ConnectionPoolFactory("multiplex", destination -> new MultiplexConnectionPool(destination, destination.getHttpClient().getMaxConnectionsPerDestination(), destination, 1)),
new ConnectionPoolFactory("random", destination -> new RandomConnectionPool(destination, destination.getHttpClient().getMaxConnectionsPerDestination(), destination, 1))
);
}
private void start(ConnectionPool.Factory factory, Handler handler) throws Exception
{
startServer(handler);
startClient(factory);
}
private void startClient(ConnectionPool.Factory factory) throws Exception
{
HttpClientTransport transport = new HttpClientTransportOverHTTP(1);
transport.setConnectionPoolFactory(factory);
client = new HttpClient(transport, null);
client.start();
}
private void startServer(Handler handler) throws Exception
{
server = new Server();
connector = new ServerConnector(server);
server.addConnector(connector);
server.setHandler(handler);
server.start();
}
@AfterEach
public void disposeServer() throws Exception
{
connector = null;
if (server != null)
{
server.stop();
server = null;
}
}
@AfterEach
public void disposeClient() throws Exception
{
if (client != null)
{
client.stop();
client = null;
}
}
@ParameterizedTest
@MethodSource("pools")
public void test(ConnectionPoolFactory factory) throws Exception
{
start(factory.factory, new EmptyServerHandler()
{
@Override
protected void service(String target, org.eclipse.jetty.server.Request jettyRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
{
switch (HttpMethod.fromString(request.getMethod()))
{
case GET:
{
int contentLength = request.getIntHeader("X-Download");
if (contentLength > 0)
{
response.setContentLength(contentLength);
response.getOutputStream().write(new byte[contentLength]);
}
break;
}
case POST:
{
int contentLength = request.getContentLength();
if (contentLength > 0)
response.setContentLength(contentLength);
IO.copy(request.getInputStream(), response.getOutputStream());
break;
}
default:
{
throw new IllegalStateException();
}
}
if (Boolean.parseBoolean(request.getHeader("X-Close")))
response.setHeader("Connection", "close");
}
});
int parallelism = 16;
int runs = 2;
int iterations = 1024;
CountDownLatch latch = new CountDownLatch(parallelism * runs);
List<Throwable> failures = new CopyOnWriteArrayList<>();
IntStream.range(0, parallelism).parallel().forEach(i ->
IntStream.range(0, runs).forEach(j ->
run(latch, iterations, failures)));
assertTrue(latch.await(iterations, TimeUnit.SECONDS));
assertTrue(failures.isEmpty(), failures.toString());
}
private void run(CountDownLatch latch, int iterations, List<Throwable> failures)
{
long begin = System.nanoTime();
for (int i = 0; i < iterations; ++i)
{
test(failures);
}
long end = System.nanoTime();
long elapsed = TimeUnit.NANOSECONDS.toMillis(end - begin);
System.err.printf("%d requests in %d ms, %.3f req/s%n", iterations, elapsed, elapsed > 0 ? iterations * 1000D / elapsed : -1D);
latch.countDown();
}
private void test(List<Throwable> failures)
{
ThreadLocalRandom random = ThreadLocalRandom.current();
// Choose a random method.
HttpMethod method = random.nextBoolean() ? HttpMethod.GET : HttpMethod.POST;
// Choose randomly whether to close the connection on the client or on the server.
boolean clientClose = false;
if (random.nextInt(100) < 1)
clientClose = true;
boolean serverClose = false;
if (random.nextInt(100) < 1)
serverClose = true;
int maxContentLength = 64 * 1024;
int contentLength = random.nextInt(maxContentLength) + 1;
test(method, clientClose, serverClose, contentLength, failures);
}
private void test(HttpMethod method, boolean clientClose, boolean serverClose, int contentLength, List<Throwable> failures)
{
Request request = client.newRequest("localhost", connector.getLocalPort())
.path("/")
.method(method);
if (clientClose)
request.header(HttpHeader.CONNECTION, "close");
else if (serverClose)
request.header("X-Close", "true");
switch (method)
{
case GET:
request.header("X-Download", String.valueOf(contentLength));
break;
case POST:
request.header(HttpHeader.CONTENT_LENGTH, String.valueOf(contentLength));
request.content(new BytesContentProvider(new byte[contentLength]));
break;
default:
throw new IllegalStateException();
}
FutureResponseListener listener = new FutureResponseListener(request, contentLength);
request.send(listener);
try
{
ContentResponse response = listener.get(5, TimeUnit.SECONDS);
assertEquals(HttpStatus.OK_200, response.getStatus());
}
catch (Throwable x)
{
failures.add(x);
}
}
@ParameterizedTest
@MethodSource("poolsNoRoundRobin")
public void testQueuedRequestsDontOpenTooManyConnections(ConnectionPoolFactory factory) throws Exception
{
// Round robin connection pool does open a few more
// connections than expected, exclude it from this test.
startServer(new EmptyServerHandler());
HttpClientTransport transport = new HttpClientTransportOverHTTP(1);
transport.setConnectionPoolFactory(factory.factory);
client = new HttpClient(transport, null);
long delay = 1000;
client.setSocketAddressResolver(new SocketAddressResolver.Sync()
{
@Override
public void resolve(String host, int port, Promise<List<InetSocketAddress>> promise)
{
client.getExecutor().execute(() ->
{
try
{
Thread.sleep(delay);
super.resolve(host, port, promise);
}
catch (InterruptedException x)
{
promise.failed(x);
}
});
}
});
client.start();
CountDownLatch latch = new CountDownLatch(2);
client.newRequest("localhost", connector.getLocalPort())
.path("/one")
.send(result ->
{
if (result.isSucceeded())
latch.countDown();
});
Thread.sleep(delay / 2);
client.newRequest("localhost", connector.getLocalPort())
.path("/two")
.send(result ->
{
if (result.isSucceeded())
latch.countDown();
});
assertTrue(latch.await(2 * delay, TimeUnit.MILLISECONDS));
List<Destination> destinations = client.getDestinations();
assertEquals(1, destinations.size());
HttpDestination destination = (HttpDestination)destinations.get(0);
AbstractConnectionPool connectionPool = (AbstractConnectionPool)destination.getConnectionPool();
assertEquals(2, connectionPool.getConnectionCount());
}
@ParameterizedTest
@MethodSource("pools")
public void testConcurrentRequestsWithSlowAddressResolver(ConnectionPoolFactory factory) throws Exception
{
// ConnectionPools may open a few more connections than expected.
startServer(new EmptyServerHandler());
int count = 500;
QueuedThreadPool clientThreads = new QueuedThreadPool(2 * count);
clientThreads.setName("client");
HttpClientTransport transport = new HttpClientTransportOverHTTP(1);
transport.setConnectionPoolFactory(factory.factory);
client = new HttpClient(transport, null);
client.setExecutor(clientThreads);
client.setMaxConnectionsPerDestination(2 * count);
client.setSocketAddressResolver(new SocketAddressResolver.Sync()
{
@Override
public void resolve(String host, int port, Promise<List<InetSocketAddress>> promise)
{
client.getExecutor().execute(() ->
{
try
{
Thread.sleep(100);
super.resolve(host, port, promise);
}
catch (InterruptedException x)
{
promise.failed(x);
}
});
}
});
client.start();
CountDownLatch latch = new CountDownLatch(count);
for (int i = 0; i < count; ++i)
{
clientThreads.execute(() -> client.newRequest("localhost", connector.getLocalPort())
.send(result ->
{
if (result.isSucceeded())
latch.countDown();
}));
}
assertTrue(latch.await(count, TimeUnit.SECONDS));
List<Destination> destinations = client.getDestinations();
assertEquals(1, destinations.size());
}
@ParameterizedTest
@MethodSource("pools")
public void testConcurrentRequestsAllBlockedOnServerWithLargeConnectionPool(ConnectionPoolFactory factory) throws Exception
{
int count = 50;
testConcurrentRequestsAllBlockedOnServer(factory, count, 2 * count);
}
@ParameterizedTest
@MethodSource("pools")
public void testConcurrentRequestsAllBlockedOnServerWithExactConnectionPool(ConnectionPoolFactory factory) throws Exception
{
int count = 50;
testConcurrentRequestsAllBlockedOnServer(factory, count, count);
}
private void testConcurrentRequestsAllBlockedOnServer(ConnectionPoolFactory factory, int count, int maxConnections) throws Exception
{
CyclicBarrier barrier = new CyclicBarrier(count);
QueuedThreadPool serverThreads = new QueuedThreadPool(2 * count);
serverThreads.setName("server");
server = new Server(serverThreads);
connector = new ServerConnector(server);
server.addConnector(connector);
server.setHandler(new EmptyServerHandler()
{
@Override
protected void service(String target, org.eclipse.jetty.server.Request jettyRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
try
{
barrier.await();
}
catch (Exception x)
{
throw new ServletException(x);
}
}
});
server.start();
QueuedThreadPool clientThreads = new QueuedThreadPool(2 * count);
clientThreads.setName("client");
HttpClientTransport transport = new HttpClientTransportOverHTTP(1);
transport.setConnectionPoolFactory(factory.factory);
client = new HttpClient(transport, null);
client.setExecutor(clientThreads);
client.setMaxConnectionsPerDestination(maxConnections);
client.start();
// Send N requests to the server, all waiting on the server.
// This should open N connections, and the test verifies that
// all N are sent (i.e. the client does not keep any queued).
CountDownLatch latch = new CountDownLatch(count);
for (int i = 0; i < count; ++i)
{
int id = i;
clientThreads.execute(() -> client.newRequest("localhost", connector.getLocalPort())
.path("/" + id)
.send(result ->
{
if (result.isSucceeded())
latch.countDown();
}));
}
assertTrue(latch.await(5, TimeUnit.SECONDS), "server requests " + barrier.getNumberWaiting() + "<" + count + " - client: " + client.dump());
List<Destination> destinations = client.getDestinations();
assertEquals(1, destinations.size());
HttpDestination destination = (HttpDestination)destinations.get(0);
AbstractConnectionPool connectionPool = (AbstractConnectionPool)destination.getConnectionPool();
assertThat(connectionPool.getConnectionCount(), Matchers.greaterThanOrEqualTo(count));
}
@ParameterizedTest
@MethodSource("pools")
public void testConnectionMaxUsage(ConnectionPoolFactory factory) throws Exception
{
startServer(new EmptyServerHandler());
int maxUsageCount = 2;
startClient(destination ->
{
AbstractConnectionPool connectionPool = (AbstractConnectionPool)factory.factory.newConnectionPool(destination);
connectionPool.setMaxUsageCount(maxUsageCount);
return connectionPool;
});
client.setMaxConnectionsPerDestination(1);
// Send first request, we are within the max usage count.
ContentResponse response1 = client.newRequest("localhost", connector.getLocalPort()).send();
assertEquals(HttpStatus.OK_200, response1.getStatus());
HttpDestination destination = (HttpDestination)client.getDestinations().get(0);
AbstractConnectionPool connectionPool = (AbstractConnectionPool)destination.getConnectionPool();
assertEquals(0, connectionPool.getActiveConnectionCount());
assertEquals(1, connectionPool.getIdleConnectionCount());
assertEquals(1, connectionPool.getConnectionCount());
// Send second request, max usage count will be reached,
// the only connection must be closed.
ContentResponse response2 = client.newRequest("localhost", connector.getLocalPort()).send();
assertEquals(HttpStatus.OK_200, response2.getStatus());
assertEquals(0, connectionPool.getActiveConnectionCount());
assertEquals(0, connectionPool.getIdleConnectionCount());
assertEquals(0, connectionPool.getConnectionCount());
}
@ParameterizedTest
@MethodSource("pools")
public void testIdleTimeoutNoRequests(ConnectionPoolFactory factory) throws Exception
{
startServer(new EmptyServerHandler());
startClient(destination ->
{
try
{
ConnectionPool connectionPool = factory.factory.newConnectionPool(destination);
connectionPool.preCreateConnections(1).get();
return connectionPool;
}
catch (Exception x)
{
throw new RuntimeException(x);
}
});
long idleTimeout = 1000;
client.setIdleTimeout(idleTimeout);
// Trigger the creation of a destination, that will create the connection pool.
HttpDestination destination = client.resolveDestination(new Origin("http", "localhost", connector.getLocalPort()));
AbstractConnectionPool connectionPool = (AbstractConnectionPool)destination.getConnectionPool();
assertEquals(1, connectionPool.getConnectionCount());
// Wait for the pre-created connections to idle timeout.
Thread.sleep(idleTimeout + idleTimeout / 2);
assertEquals(0, connectionPool.getConnectionCount());
}
private static class ConnectionPoolFactory
{
private final String name;
private final ConnectionPool.Factory factory;
private ConnectionPoolFactory(String name, ConnectionPool.Factory factory)
{
this.name = name;
this.factory = factory;
}
@Override
public String toString()
{
return name;
}
}
}