// ========================================================================
// Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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 org.mortbay.terracotta.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.mortbay.jetty.HttpMethods;
import org.mortbay.jetty.client.ContentExchange;
import org.mortbay.jetty.client.HttpClient;
import org.testng.annotations.Test;
/**
* @version $Revision: 1257 $ $Date: 2008-10-18 02:12:06 +1100 (Sat, 18 Oct 2008) $
*/
public class LightLoadTest
{
@Test
public void testLightLoad() throws Exception
{
Random random = new Random(System.nanoTime());
String contextPath = "";
String servletMapping = "/server";
int port1 = random.nextInt(50000) + 10000;
TerracottaJettyServer server1 = new TerracottaJettyServer(port1);
server1.addContext(contextPath).addServlet(TestServlet.class, servletMapping);
server1.start();
try
{
int port2 = random.nextInt(50000) + 10000;
TerracottaJettyServer server2 = new TerracottaJettyServer(port2);
server2.addContext(contextPath).addServlet(TestServlet.class, servletMapping);
server2.start();
try
{
HttpClient client = new HttpClient();
client.setConnectorType(HttpClient.CONNECTOR_SOCKET);
client.start();
try
{
String[] urls = new String[2];
urls[0] = "http://localhost:" + port1 + contextPath + servletMapping;
urls[1] = "http://localhost:" + port2 + contextPath + servletMapping;
ContentExchange exchange1 = new ContentExchange(true);
exchange1.setMethod(HttpMethods.GET);
exchange1.setURL(urls[0] + "?action=init");
client.send(exchange1);
exchange1.waitForDone();
assert exchange1.getResponseStatus() == HttpServletResponse.SC_OK;
String sessionCookie = exchange1.getResponseFields().getStringField("Set-Cookie");
assert sessionCookie != null;
ExecutorService executor = Executors.newCachedThreadPool();
int clientsCount = 10;
CyclicBarrier barrier = new CyclicBarrier(clientsCount + 1);
int requestsCount = 100;
Worker[] workers = new Worker[clientsCount];
for (int i = 0; i < clientsCount; ++i)
{
workers[i] = new Worker(barrier, requestsCount, sessionCookie, urls);
workers[i].start();
executor.execute(workers[i]);
}
// Wait for all workers to be ready
barrier.await();
long start = System.nanoTime();
// Wait for all workers to be done
barrier.await();
long end = System.nanoTime();
long elapsed = TimeUnit.NANOSECONDS.toMillis(end - start);
System.out.println("elapsed ms: " + elapsed);
for (Worker worker : workers) worker.stop();
executor.shutdownNow();
// Perform one request to get the result
ContentExchange exchange2 = new ContentExchange(true);
exchange2.setMethod(HttpMethods.GET);
exchange2.setURL(urls[0] + "?action=result");
exchange2.getRequestFields().add("Cookie", sessionCookie);
client.send(exchange2);
exchange2.waitForDone();
assert exchange2.getResponseStatus() == HttpServletResponse.SC_OK;
String response = exchange2.getResponseContent();
System.out.println("get = " + response);
assert response.trim().equals(String.valueOf(clientsCount * requestsCount));
}
finally
{
client.stop();
}
}
finally
{
server2.stop();
}
}
finally
{
server1.stop();
}
}
public static class Worker implements Runnable
{
private final HttpClient client;
private final CyclicBarrier barrier;
private final int requestsCount;
private final String sessionCookie;
private final String[] urls;
public Worker(CyclicBarrier barrier, int requestsCount, String sessionCookie, String[] urls)
{
this.client = new HttpClient();
this.client.setConnectorType(HttpClient.CONNECTOR_SOCKET);
this.barrier = barrier;
this.requestsCount = requestsCount;
this.sessionCookie = sessionCookie;
this.urls = urls;
}
public void start() throws Exception
{
client.start();
}
public void stop() throws Exception
{
client.stop();
}
public void run()
{
try
{
// Wait for all workers to be ready
barrier.await();
Random random = new Random(System.nanoTime());
for (int i = 0; i < requestsCount; ++i)
{
int urlIndex = random.nextInt(urls.length);
ContentExchange exchange = new ContentExchange(true);
exchange.setMethod(HttpMethods.GET);
exchange.setURL(urls[urlIndex] + "?action=increment");
exchange.getRequestFields().add("Cookie", sessionCookie);
client.send(exchange);
exchange.waitForDone();
assert exchange.getResponseStatus() == HttpServletResponse.SC_OK;
}
// Wait for all workers to be done
barrier.await();
}
catch (Exception x)
{
throw new RuntimeException(x);
}
}
}
public static class TestServlet extends HttpServlet
{
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
String action = request.getParameter("action");
if ("init".equals(action))
{
HttpSession session = request.getSession(true);
session.setAttribute("value", 0);
}
else if ("increment".equals(action))
{
// Without synchronization, because it is taken care by Jetty/Terracotta
HttpSession session = request.getSession(false);
int value = (Integer)session.getAttribute("value");
session.setAttribute("value", value + 1);
}
else if ("result".equals(action))
{
HttpSession session = request.getSession(false);
int value = (Integer)session.getAttribute("value");
PrintWriter writer = response.getWriter();
writer.println(value);
writer.flush();
}
}
}
}