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//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.server.session;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
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.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.api.Request;
import org.junit.Test;
/**
* AbstractSameNodeLoadTest
*
* This test performs multiple concurrent requests for the same session on the same node.
*
*/
public abstract class AbstractSameNodeLoadTest
{
protected boolean _stress = Boolean.getBoolean( "STRESS" );
public abstract AbstractTestServer createServer(int port);
@Test
public void testLoad() throws Exception
{
if ( _stress )
{
String contextPath = "";
String servletMapping = "/server";
AbstractTestServer server1 = createServer( 0 );
server1.addContext( contextPath ).addServlet( TestServlet.class, servletMapping );
try
{
server1.start();
int port1 = server1.getPort();
HttpClient client = new HttpClient();
client.start();
try
{
String url = "http://localhost:" + port1 + contextPath + servletMapping;
//create session via first server
ContentResponse response1 = client.GET(url + "?action=init");
assertEquals(HttpServletResponse.SC_OK,response1.getStatus());
String sessionCookie = response1.getHeaders().getStringField( "Set-Cookie" );
assertTrue(sessionCookie != null);
// Mangle the cookie, replacing Path with $Path, etc.
sessionCookie = sessionCookie.replaceFirst("(\\W)(P|p)ath=", "$1\\$Path=");
//simulate 10 clients making 100 requests each
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, client, requestsCount, sessionCookie, url);
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 );
executor.shutdownNow();
// Perform one request to get the result
Request request = client.newRequest( url + "?action=result" );
request.header("Cookie", sessionCookie);
ContentResponse response2 = request.send();
assertEquals(HttpServletResponse.SC_OK,response2.getStatus());
String response = response2.getContentAsString();
System.out.println( "get = " + response );
assertEquals(response.trim(), String.valueOf( clientsCount * requestsCount ) );
}
finally
{
client.stop();
}
}
finally
{
server1.stop();
}
}
}
public static class Worker implements Runnable
{
public static int COUNT = 0;
private final HttpClient client;
private final CyclicBarrier barrier;
private final int requestsCount;
private final String sessionCookie;
private final String url;
private final String name;
public Worker(CyclicBarrier barrier, HttpClient client, int requestsCount, String sessionCookie, String url)
{
this.client = client;
this.barrier = barrier;
this.requestsCount = requestsCount;
this.sessionCookie = sessionCookie;
this.url = url;
this.name = ""+(COUNT++);
}
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 pauseMsec = random.nextInt(1000);
//wait a random number of milliseconds between requests up to 1 second
if (pauseMsec > 0)
{
Thread.currentThread().sleep(pauseMsec);
}
Request request = client.newRequest(url + "?action=increment");
request.header("Cookie", sessionCookie);
ContentResponse response = request.send();
assertEquals(HttpServletResponse.SC_OK,response.getStatus());
}
// 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 ) )
{
HttpSession session = request.getSession( false );
assertNotNull(session);
synchronized(session)
{
int value = (Integer) session.getAttribute( "value" );
session.setAttribute( "value", value + 1 );
}
}
else if ( "result".equals( action ) )
{
HttpSession session = request.getSession( false );
assertNotNull(session);
Integer value = null;
synchronized (session)
{
value = (Integer) session.getAttribute( "value" );
}
PrintWriter writer = response.getWriter();
writer.println( value );
writer.flush();
}
}
}
}
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