1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 /*
  24  * @test
  25  * @bug 6882687 8011124
  26  * @summary KerberosTime too imprecise
  27  * @modules java.security.jgss/sun.security.krb5.internal
  28  */
  29 
  30 import sun.security.krb5.internal.KerberosTime;
  31 
  32 public class MicroTime {
  33     public static void main(String[] args) throws Exception {
  34         // We count how many different KerberosTime values
  35         // can be acquired within one second.
  36         KerberosTime t1 = KerberosTime.now();
  37         KerberosTime last = t1;
  38         int count = 0;
  39         while (true) {
  40             KerberosTime t2 = KerberosTime.now();
  41             if (t2.getTime() - t1.getTime() > 1000) break;
  42             if (!last.equals(t2)) {
  43                 last = t2;
  44                 count++;
  45             }
  46         }
  47         // We believe a nice KerberosTime can at least tell the
  48         // difference of 100 musec.
  49         if (count < 10000) {
  50             throw new Exception("What? only " + (1000000/count) +
  51                     " musec precision?");
  52         }
  53     }
  54 }