1 /*
   2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2020 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 import java.util.Random;
  27 
  28 public class RandomHelper {
  29 
  30     static Random rand;
  31 
  32     static {
  33         long seed = Long.parseLong(System.getProperty("metaspace.random.seed", "0"));
  34         if (seed == 0) {
  35             seed = System.currentTimeMillis();
  36             System.out.println("Random seed: " + seed);
  37         } else {
  38             System.out.println("Random seed: " + seed + " (passed in)");
  39         }
  40         rand = new Random(seed);
  41     }
  42 
  43     static Random random() { return rand; }
  44 
  45     static boolean fiftyfifty() { return random().nextInt(10) >= 5; }
  46 
  47 }