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