1 /*
   2  * Copyright (c) 2014, 2016, 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 package jdk.test.lib;
  25 
  26 import java.util.Objects;
  27 
  28 /**
  29  * Class which runs another Runnable in infinite loop with certain pauses
  30  * between cycles.
  31  */
  32 public class InfiniteLoop implements Runnable {
  33     private final Runnable target;
  34     private final long mills;
  35 
  36 
  37     /**
  38      * @param target a target to run in a loop
  39      * @param mills  the length of pause time in milliseconds
  40      * @throws NullPointerException if target is null
  41      * @throws IllegalArgumentException if the value of millis is negative
  42      */
  43     public InfiniteLoop(Runnable target, long mills) {
  44         Objects.requireNonNull(target);
  45         if (mills < 0) {
  46             throw new IllegalArgumentException("mills < 0");
  47         }
  48         this.target = target;
  49         this.mills = mills;
  50     }
  51 
  52     @Override
  53     public void run() {
  54         try {
  55             while (true) {
  56                 target.run();
  57                 if (mills > 0) {
  58                     Thread.sleep(mills);
  59                 }
  60             }
  61         } catch (InterruptedException e) {
  62             Thread.currentThread().interrupt();
  63             throw new Error(e);
  64         }
  65     }
  66 }