/*

 * Copyright 2003-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * @test

 * @bug     4858522

 * @summary Basic unit test of HotspotRuntimeMBean.getTotalSafepointTime()

 * @author  Steve Bohne

 */

/*

 * This test is just a sanity check and does not check for the correct value.

 */

import sun.management.*;

public class GetTotalSafepointTime {

    private static HotspotRuntimeMBean mbean =

        (HotspotRuntimeMBean)ManagementFactory.getHotspotRuntimeMBean();

    private static final long NUM_THREAD_DUMPS = 100;

    // Careful with these values.

    private static final long MIN_VALUE_FOR_PASS = 1;

    private static final long MAX_VALUE_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;

        }

        // Thread.getAllStackTraces() should cause safepoints.

        // If this test is failing because it doesn't,

        // MIN_VALUE_FOR_PASS should be reset to 0

        for (int i = 0; i < NUM_THREAD_DUMPS; i++) {

             Thread.getAllStackTraces();

        }

        long value = mbean.getTotalSafepointTime();

        if (trace) {

            System.out.println("Total safepoint time (ms): " + value);

        }

        if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {

            throw new RuntimeException("Total safepoint time " +

                                       "illegal value: " + value + " ms " +

                                       "(MIN = " + MIN_VALUE_FOR_PASS + "; " +

                                       "MAX = " + MAX_VALUE_FOR_PASS + ")");

        }

        for (int i = 0; i < 2 * NUM_THREAD_DUMPS; i++) {

             Thread.getAllStackTraces();

        }

        long value2 = mbean.getTotalSafepointTime();

        if (trace) {

            System.out.println("Total safepoint time2 (ms): " + value2);

        }

        if (value2 <= value) {

            throw new RuntimeException("Total safepoint time " +

                                       "did not increase " +

                                       "(value = " + value + "; " +

                                       "value2 = " + value2 + ")");

        }

        System.out.println("Test passed.");

    }

}