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1   /**
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v1.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.core.testUtil;
15  
16  import java.util.Random;
17  
18  public class RandomUtil {
19  
20      private static Random random = new Random();
21  
22      public static int getRandomServerPort() {
23          int r = random.nextInt(20000);
24          // the first 1024 ports are usually reserved for the OS
25          return r + 1024;
26      }
27  
28      public static int getPositiveInt() {
29          int r = random.nextInt();
30          if (r < 0) {
31              r = -r;
32          }
33          return r;
34      }
35  }