Cobertura example source code file (TouchCollectorTest.java)

This example Cobertura source code file (TouchCollectorTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Cobertura tags/keywords

atomicreference, atomicreference, projectdata, testcase, testthreadgroup, thread, thread, threadgroup, threadgroup, throwable, throwable, touchcollectortest

The Cobertura TouchCollectorTest.java source code

/*
 * Cobertura - http://cobertura.sourceforge.net/
 *
 * Copyright (C) 2010 John Lewis
 *
 * Note: This file is dual licensed under the GPL and the Apache
 * Source License (so that it can be used from both the main
 * Cobertura classes and the ant tasks).
 *
 * Cobertura is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Cobertura is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cobertura; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package net.sourceforge.cobertura.coveragedata;

import java.util.concurrent.atomic.AtomicReference;

import junit.framework.TestCase;

public class TouchCollectorTest extends TestCase
{
	private static void touchIteratively(int num)
	{
		for (int i=0; i<2000; i++)
		{
			/*
			 * The following yield is needed to make sure the other thread gets
			 * some CPU.  Otherwise, this thread will get too much of a jump ahead
			 * of the other thread.
			 */
			Thread.yield(); 
			
			TouchCollector.touch(Integer.toString(i),1);
		}
	}

	private void runTestWithTwoThreads() throws Throwable
	{
		final AtomicReference<Throwable> possibleThrowable = new AtomicReference();

		ThreadGroup threadGroup = new ThreadGroup("TestThreadGroup") {
			public void uncaughtException(Thread thread, Throwable t)
			{
				/*
				 * Save the Throwable for later use and interrupt this thread so it exits
				 */
				possibleThrowable.set(t);
				thread.interrupt();
			}
		};

		/*
		 * Create two threads using the above thread group
		 */
		Thread thread1 = new Thread(threadGroup, "1") {
			public void run()
			{
				touchIteratively(0);
			}
		};
		Thread thread2 = new Thread(threadGroup, "2") {
			public void run()
			{
				touchIteratively(1);
			}
		};
		thread1.start();
		thread2.start();
		/*
		 * Wait for the threads to exit
		 */
		if (thread1.isAlive()) thread1.join();
		if (thread2.isAlive()) thread2.join();
		Throwable t = possibleThrowable.get();
		if (t != null)
		{
			throw t;
		}
		TouchCollector.applyTouchesOnProjectData(new ProjectData());
	}

	/**
	 * Tests the thread safety of the TouchCollector.   Since TouchCollector has all
	 * static methods, it is difficult to get this test to fail everytime if
	 * there is a thread problem.
	 * 
	 * At the time this test was written, TouchCollector had a problem, but
	 * this test needed to be run a few times before seeing a failure.   The
	 * majority of times it would fail though.
	 */
	public void testMultiThreaded() throws Throwable
	{
		runTestWithTwoThreads();
	}

}