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/*
* Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4858522
* @summary Basic unit test of HotspotClassLoadingMBean.getClassLoadingTime()
* @author Steve Bohne
*
* @build ClassToLoad0
* @run main/othervm -XX:+UsePerfData GetClassLoadingTime
*/
/*
* This test is just a sanity check and does not check for the correct value.
*/
import java.io.*;
import sun.management.*;
public class GetClassLoadingTime {
private static HotspotClassLoadingMBean mbean =
(HotspotClassLoadingMBean)ManagementFactoryHelper.getHotspotClassLoadingMBean();
// Careful with these values.
private static final long MIN_TIME_FOR_PASS = 1;
private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE;
private static boolean trace = false;
public static void main(String args[]) throws Exception {
if (args.length > 0 && args[0].equals("trace")) {
trace = true;
}
long time = mbean.getClassLoadingTime();
if (trace) {
System.out.println("Class loading time (ms): " + time);
}
if (time < MIN_TIME_FOR_PASS || time > MAX_TIME_FOR_PASS) {
throw new RuntimeException("Class loading time " +
"illegal value: " + time + " ms " +
"(MIN = " + MIN_TIME_FOR_PASS + "; " +
"MAX = " + MAX_TIME_FOR_PASS + ")");
}
// Load some classes to increase the time
for (int i = 0; i < 1000; i++) {
Class.forName("ClassToLoad0", true, new KlassLoader());
}
long time2 = mbean.getClassLoadingTime();
if (trace) {
System.out.println("Class loading time2 (ms): " + time2);
}
if (time2 <= time) {
throw new RuntimeException("Class loading time " +
"did not increase when class loaded" +
"(time = " + time + "; " +
"time2 = " + time2 + ")");
}
System.out.println("Test passed.");
}
}
// KlassLoader exists to load classes without a parent classloader,
// so we can avoid delegation and spend lots of time loading the
// same class over and over, to test the class loading timer.
class KlassLoader extends ClassLoader {
public KlassLoader() {
super(null);
}
protected synchronized Class findClass(String name)
throws ClassNotFoundException {
String cname =
name.replace('.', '/')
+".class";
FileInputStream in;
try {
in = new FileInputStream(new File(System.getProperty("test.classes", "."), cname));
if (in == null) {
throw new ClassNotFoundException("getResourceAsStream("
+cname+")");
}
} catch(java.io.FileNotFoundException e ) {
throw new ClassNotFoundException("getResourceAsStream("
+cname+") : "
+e);
}
int len;
byte data[];
try {
len = in.available();
data = new byte[len];
for (int total = 0; total < data.length; ) {
total += in.read(data, total, data.length - total);
}
} catch (IOException e) {
throw new ClassNotFoundException(cname, e);
} finally {
try {
in.close();
} catch (IOException e) {
}
}
return defineClass(name, data, 0, data.length);
}
}
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