RandomHelper.java

/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2020 SAP SE. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

import java.util.Random;

public class RandomHelper {

    static Random rand;

    static {
        long seed = Long.parseLong(System.getProperty("metaspace.random.seed", "0"));
        if (seed == 0) {
            seed = System.currentTimeMillis();
            System.out.println("Random seed: " + seed);
        } else {
            System.out.println("Random seed: " + seed + " (passed in)");
        }
        rand = new Random(seed);
    }

    static Random random() { return rand; }

    static boolean fiftyfifty() { return random().nextInt(10) >= 5; }

}