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/*
* TestTrace2DLtd.java, a Junit test case for Trace2DLtd.
* Copyright (C) Achim Westermann, created on 23.04.2005, 08:21:12
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* If you modify or optimize the code in a useful way please let me know.
* Achim.Westermann@gmx.de
*
*/
package info.monitorenter.gui.chart.traces;
import info.monitorenter.gui.chart.Chart2D;
import info.monitorenter.gui.chart.ITrace2D;
import info.monitorenter.gui.chart.ITracePoint2D;
import info.monitorenter.gui.chart.TracePoint2D;
import java.util.Map;
import java.util.WeakHashMap;
import junit.framework.Assert;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* A Junit test case for <code>{@link Trace2DLtd}</code>.
* <p>
*
* @author <a href="mailto:Achim.Westermann@gmx.de">Achim Westermann</a>
*
*/
public class TestTrace2DLtd extends TestCase {
/**
* Test suite for this test class.
* <p>
*
* @return the test suite.
*/
public static Test suite() {
TestSuite suite = new TestSuite();
suite.setName(TestTrace2DLtd.class.getName());
suite.addTest(new TestTrace2DLtd("testMemoryLeak"));
return suite;
}
/**
* Creates a test case with the given name.
* <p>
*
* @param testName
* the name of the test case.
*/
public TestTrace2DLtd(final String testName) {
super(testName);
}
/**
* Adds 1000000 <code>{@link TracePoint2D}</code> instances to a
* <code>{@link Trace2DLtd}</code> and asserts that not more points than
* <code>{@link Trace2DLtd#getMaxSize()} </code> are remaining in memory.
* <p>
*
*/
public void testMemoryLeak() {
Chart2D dummyChart = new Chart2D();
int traceSize = 10;
ITrace2D trace = new Trace2DLtd(traceSize);
dummyChart.addTrace(trace);
long max = 1000000;
long percentModulo = max / 20;
System.out.println("Adding " + max
+ " points to a Trace2DLtd and a WeakHashMap...");
ITracePoint2D point;
Map<ITracePoint2D, String> weakMap = new WeakHashMap<ITracePoint2D, String>();
for (long i = 0; i < max; i++) {
point = new TracePoint2D(i, i);
trace.addPoint(point);
weakMap.put(point, point.toString());
if (i % percentModulo == 0) {
System.out.println((i * 100 / max) + " %");
}
}
System.out.println("Dropping point reference (but holding trace)...");
point = null;
// trace=null;
long keys = weakMap.size();
System.out.println("Points remaining in the weakMap: " + keys);
System.out.println("System.runFinalization()... ");
System.runFinalization();
System.out.println("System.gc()... ");
System.gc();
keys = 0;
for (ITracePoint2D pt : weakMap.keySet()) {
keys++;
System.out.println("Point " + pt.toString() + " was not dropped.");
}
System.out.println("Points remaining in the weakMap: " + keys);
Assert.assertFalse("There are " + keys
+ " TracePoint2D instances not deleted from the WeakHashMap.",
keys > traceSize);
}
}
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