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 }