JavaSequencerClockTestCase.java

/*
 *	JavaSequencerClockTestCase.java
 */

/*
 *  Copyright (c) 2003 by Matthias Pfisterer
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.tritonus.test.sequencer;

import org.tritonus.midi.device.java.JavaSequencer;
import org.tritonus.midi.device.java.SystemCurrentTimeMillisClock;
import org.tritonus.midi.device.java.SunMiscPerfClock;

import junit.framework.TestCase;
import org.tritonus.test.Util;


/**	Base class for testsof javax.sound.midi.Sequencer.
 */
public class JavaSequencerClockTestCase
extends TestCase
{
	private static final boolean IGNORE_SUN_SEQUENCER = true;


	public JavaSequencerClockTestCase(String strName)
	{
		super(strName);
	}



	public void testSunMiscPerfClock()
		throws Exception
	{
		checkClock(new SunMiscPerfClock());
	}



	public void testSystemCurrentTimeMillisClock()
		throws Exception
	{
		checkClock(new SystemCurrentTimeMillisClock());
	}



	private void checkClock(JavaSequencer.Clock clock)
		throws Exception
	{
		long lSystemStartTime = System.currentTimeMillis() * 1000;
		long lClockStartTime = clock.getMicroseconds();
		for (int i = 1; i <= 4; i++)
		{
			System.out.println("testing at " + System.currentTimeMillis());
			long lSystemElapsedTime = System.currentTimeMillis() * 1000
				- lSystemStartTime;
			long lClockElapsedTime = clock.getMicroseconds() - lClockStartTime;
			long lTimeDelta = lClockElapsedTime - lSystemElapsedTime;
			/* Here, we allow 1 millisecond difference. This test is
			   supposed to fail on platforms that have a low-resolution
			   implementation of System.currentTimeMillis().
			*/
			assertTrue("clock precision", Math.abs(lTimeDelta) <= 1000);
			Util.sleep((long) Math.pow(10, i));
		}
	}


	public void testSetGetClock()
		throws Exception
	{
		JavaSequencer seq = getSequencer();
		assertNotNull("initial clock", seq.getClock());
		JavaSequencer.Clock clock = new TestClock();
		seq.setClock(clock);
		assertSame("setClock", clock, seq.getClock());
	}


	// TODO: setClock() in open state throws IllegalStateException

	private JavaSequencer getSequencer()
	{
		return new JavaSequencer(null);
	}


	private static class TestClock
	implements JavaSequencer.Clock
	{
		public long getMicroseconds()
		{
			return -1;
		}
	}

}



/*** JavaSequencerClockTestCase.java ***/