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/*******************************************************************************
* Copyright (c) 2010, 2016 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ua.tests.help.webapp;
import static org.junit.Assert.fail;
import java.io.InputStream;
import java.net.URL;
import org.eclipse.help.internal.server.WebappManager;
import org.eclipse.ua.tests.help.util.LoadServletUtil;
import org.junit.After;
import org.junit.Test;
/**
* Test the performance of the help server without launching the Help UI
* Note, this test has been contributed to Equinox, see Bug 362511
* It is no longer run as part of the UA test suite
*/
public class ParallelServerAccessTest {
@After
public void tearDown() throws Exception {
LoadServletUtil.stopServer();
}
@Test
public void testServletReadInParallel() throws Exception {
LoadServletUtil.startServer();
int iterations = 1; // Change this to increase the length of the test
for (int i=0; i < iterations; ++i) {
accessInParallel(10);
}
}
private void accessInParallel(int numberOfThreads) throws Exception {
ReadThread[] readers = new ReadThread[numberOfThreads];
for (int i = 0; i < numberOfThreads; i++) {
readers[i] = new ReadThread();
}
for (int i = 0; i < numberOfThreads; i++) {
readers[i].start();
}
// Now wait for the threads to complete
boolean complete = false;
int iterations = 0;
do {
complete = true;
iterations++;
if (iterations > 1000) {
fail("Test did not complete within 100 seconds");
}
for (int i = 0; i < numberOfThreads && complete; i++) {
if (readers[i].isAlive()) {
complete = false;
try {
Thread.sleep(100);
} catch (InterruptedException e) {
fail("Interrupted Exception");
}
}
}
} while (!complete);
for (int i = 0; i < numberOfThreads; i++) {
if (readers[i].exception != null) {
throw readers[i].exception;
}
}
}
private class ReadThread extends Thread {
public Exception exception;
@Override
public void run() {
for (int j = 0; j <= 100; j++) {
try {
readLoadServlet(200);
} catch (Exception e) {
this.exception = e;
e.printStackTrace();
}
}
}
}
private class UnexpectedValueException extends Exception {
private static final long serialVersionUID = 1L;
private long expected;
private long actual;
UnexpectedValueException(long expected, long actual) {
this.expected = expected;
this.actual = actual;
}
@Override
public String getMessage() {
return "Expected: " + expected +" Actual: " + actual;
}
}
long readOperations = 0;
public void readLoadServlet(int paragraphs) throws Exception {
int port = WebappManager.getPort();
// Use a unique parameter to defeat caching
long uniqueId = getReadOperations();
URL url = new URL("http", "localhost", port,
"/help/loadtest?value=" + uniqueId + "&repeat=" + paragraphs);
InputStream input = url.openStream();
int nextChar;
long value = 0;
// The loadtest servlet returns the uniqueParam in an opening comment such as <!--1234-->
// Read this to verify that we are not getting a cached page
boolean inFirstComment = true;
do {
nextChar = input.read();
if (inFirstComment) {
if (nextChar == '>') {
inFirstComment = false;
} else if (Character.isDigit((char) nextChar)) {
value = value * 10 + (nextChar - '0');
}
}
} while (nextChar != '$');
input.close();
if (uniqueId != value) {
throw new UnexpectedValueException(uniqueId, value);
}
}
private synchronized long getReadOperations() {
return ++readOperations;
}
}
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