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XLT (Xceptance LoadTest) is an extensive load and performance test tool developed and maintained by Xceptance.
/*
* Copyright (c) 2005-2022 Xceptance Software Technologies GmbH
*
* 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.xceptance.xlt.engine;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerList;
import org.eclipse.jetty.server.handler.ResourceHandler;
import org.eclipse.jetty.util.resource.Resource;
import org.junit.After;
import org.junit.Test;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.xceptance.xlt.api.engine.scripting.AbstractWebDriverScriptTestCase;
import com.xceptance.xlt.api.util.XltProperties;
import com.xceptance.xlt.api.webdriver.XltDriver;
import com.xceptance.xlt.common.XltConstants;
import com.xceptance.xlt.engine.resultbrowser.RequestHistory.DumpMode;
/**
* Utility to warm the XLT framework up. Warming the framework (including the JVM) up is only necessary if you need
* reliable measurements right from the beginning, for example for monitoring test cases which are being run only once
* per JVM. For load tests, an explicit warm-up is typically not needed as there is a ramp-up period anyway.
*
* To warm the framework up explicitly, add a static initializer block to all your test cases (or a super class) as
* shown below:
*
*
* public class TVisit extends AbstractTestCase
* {
* static
* {
* XltEngineWarmUp.execute();
* }
*
* @Test
* public void test()
* {
* // ...
* }
* }
*
*
* This way, the warm-up is part of all your test cases, but the actual procedure will be performed for the first
* invocation only.
*/
public class XltEngineWarmUp
{
/**
* The log facility of this class.
*/
private static final Logger LOG = LoggerFactory.getLogger(XltEngineWarmUp.class);
/**
* Whether the warm-up was already performed.
*/
private static boolean alreadyRun;
/**
* The port used by the internal HTTP server.
*/
private static int serverPort;
/**
* Performs the warm-up of the XLT framework. The warm-up will be run only once per JVM. This method returns
* immediately when being called a second time.
*/
public static synchronized void execute()
{
if (!alreadyRun)
{
alreadyRun = true;
// get the warm-up settings
final XltProperties props = XltProperties.getInstance();
final String prefix = XltConstants.XLT_PACKAGE_PATH + "warmUp.";
final boolean enabled = true; // TODO: props.getProperty(prefix + "enabled", false);
final int iterations = props.getProperty(prefix + "iterations", 10);
// perform warm-up if enabled
if (enabled)
{
LOG.debug("Performing warm-up...");
// create an embedded HTTP server
final Server server = createServer();
// start the HTTP server
try
{
server.start();
}
catch (final Exception e)
{
LOG.error("Warm-up: Failed to start HTTP server", e);
}
// retrieve the port of the HTTP server once it was started
serverPort = ((ServerConnector) server.getConnectors()[0]).getLocalPort();
// warm the framework up
performWarmUp(iterations);
// stop the HTTP server
try
{
server.stop();
}
catch (final Exception e)
{
LOG.error("Warm-up: Failed to stop HTTP server", e);
}
}
}
}
/**
* Creates a simple embedded HTTP server that serves content from the class path.
*
* @return the server
*/
private static Server createServer()
{
final Resource resource = Resource.newClassPathResource("/com/xceptance/xlt/engine/warmup/");
final ResourceHandler resourceHandler = new ResourceHandler();
resourceHandler.setBaseResource(resource);
final HandlerList handlers = new HandlerList(resourceHandler, new DefaultHandler());
final Server server = new Server(0); // choose a free port
server.setHandler(handlers);
return server;
}
/**
* Runs the warm-up scenario repeatedly.
*
* @param iterations
* the number of warm-up iterations
*/
private static void performWarmUp(final int iterations)
{
// disable the logging of measurements and the creation of a result browser
final SessionImpl session = SessionImpl.getCurrent();
session.getDataManager().setLoggingEnabled(false);
session.getRequestHistory().setDumpMode(DumpMode.NEVER);
// run the warm-up scenario repeatedly
for (int i = 0; i < iterations; i++)
{
LOG.debug("Warm-up iteration #" + i);
final Result result = JUnitCore.runClasses(WarmUp.class);
if (result.getFailureCount() > 0)
{
LOG.error("Warm-up: Scenario failed", result.getFailures().get(0).getException());
}
}
// clean up the current session
SessionImpl.removeCurrent();
}
/**
* Test scenario used for warming up the XLT framework. Reads an HTML page from an embedded HTTP server.
*/
public static class WarmUp extends AbstractWebDriverScriptTestCase
{
public WarmUp()
{
super(new XltDriver(true), "http://localhost:" + serverPort);
}
@Test
public void test()
{
startAction("WarmUp");
open("index.html");
assertTitle("Warm-Up");
}
@After
public void cleanUp()
{
getWebDriver().quit();
}
}
}