jdk/test/sun/management/HotspotClassLoadingMBean/GetClassLoadingTime.java
author alexsch
Thu, 31 Jul 2014 14:28:10 +0400
changeset 26019 10a56d28f48d
parent 21803 791d8485f6ed
child 30376 2ccf2cf7ea48
permissions -rw-r--r--
8051838: [Findbugs]sun.awt.image.MultiResolutionCachedImage expose internal representation Reviewed-by: serb, pchelko
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/*
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 * Copyright (c) 2003, 2013, 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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 * @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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}