1 /*

     2  * Copyright 2010 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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

    21  * have any questions.

    22  */

    23 /*

    24  * @test

    25  * @bug 6882687

    26  * @summary KerberosTime too imprecise

    27  */

    28 

    29 import sun.security.krb5.internal.KerberosTime;

    30 

    31 public class MicroTime {

    32     public static void main(String[] args) throws Exception {

    33         // We count how many different KerberosTime values

    34         // can be acquired within one second.

    35         KerberosTime t1 = new KerberosTime(true);

    36         KerberosTime last = t1;

    37         int count = 0;

    38         while (true) {

    39             KerberosTime t2 = new KerberosTime(true);

    40             if (t2.getTime() - t1.getTime() > 1000) break;

    41             if (!last.equals(t2)) {

    42                 last = t2;

    43                 count++;

    44             }

    45         }

    46         // We believe a nice KerberosTime can at least tell the

    47         // difference of 100 musec.

    48         if (count < 10000) {

    49             throw new Exception("What? only " + (1000000/count) +

    50                     " musec precision?");

    51         }

    52     }

    53 }