/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.wicket.protocol.http;
import org.apache.wicket.util.SlowTests;
import org.junit.Assert;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import java.util.ArrayList;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Test for https://issues.apache.org/jira/browse/WICKET-6169
*/
@Category(SlowTests.class)
public class RequestLoggerLiveSessionsTest
{
private final RequestLogger requestLogger = new RequestLogger();
private final ArrayList<String> sessionIds = new ArrayList<>();
@Test
public void concurrentModification() {
SessionCreateThread sct = new SessionCreateThread();
SessionDestroyThread sdt = new SessionDestroyThread();
sct.start();
sdt.start();
AtomicBoolean nullPointerExceptionThrown = new AtomicBoolean(false);
int count = 10000000;
while (count-- > 0)
{
try {
requestLogger.getLiveSessions();
}
catch (NullPointerException e)
{
e.printStackTrace();
nullPointerExceptionThrown.set(true);
break;
}
}
sct.interrupt();
sdt.interrupt();
if (nullPointerExceptionThrown.get()) {
Assert.fail("The test should not fail with NullPointerException");
}
}
private class SessionCreateThread extends Thread
{
private final Random random = new Random();
public void run()
{
while (!isInterrupted())
{
if (sessionIds.size() < 50)
{
String sessionId = UUID.randomUUID().toString();
synchronized (sessionIds) {
sessionIds.add(sessionId);
}
requestLogger.sessionCreated(sessionId);
}
try
{
Thread.sleep(random.nextInt(20));
}
catch (InterruptedException e) {
}
}
}
}
private class SessionDestroyThread extends Thread
{
private final Random random = new Random();
public void run()
{
while (!isInterrupted())
{
if (sessionIds.size() > 0)
{
String sessionId = sessionIds.get(random.nextInt(sessionIds.size()));
requestLogger.sessionDestroyed(sessionId);
synchronized (sessionIds) {
sessionIds.remove(sessionId);
}
}
try
{
Thread.sleep(random.nextInt(20));
}
catch (InterruptedException e) {
}
}
}
}
}