/*

 * 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);

  }

}