/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

 * 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).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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 */

/*

 * @test

 * @bug     4858522

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

 * @author  Steve Bohne

 */

/*

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

 */

import sun.management.*;

public class GetSafepointSyncTime {

    private static HotspotRuntimeMBean mbean =

        (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();

    private static final long NUM_THREAD_DUMPS = 300;

    // 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.getSafepointSyncTime();

        if (trace) {

            System.out.println("Safepoint sync time (ms): " + value);

        }

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

            throw new RuntimeException("Safepoint sync time " +

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

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

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

        }

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

            Thread.getAllStackTraces();

        }

        long value2 = mbean.getSafepointSyncTime();

        if (trace) {

            System.out.println("Safepoint sync time2 (ms): " + value2);

        }

        if (value2 <= value) {

            throw new RuntimeException("Safepoint sync time " +

                                       "did not increase " +

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

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

        }

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

    }

}