1 /*
   2  * Copyright (c) 2014, 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.testlibrary;
  25 
  26 import java.util.Objects;
  27 import java.util.concurrent.Callable;
  28 
  29 /**
  30  * Auxiliary class to run target w/ given timeout.
  31  */
  32 public class TimeLimitedRunner implements Callable<Void> {
  33     private final long stoptime;
  34     private final long timeout;
  35     private final Callable<Boolean> target;
  36 
  37     /**
  38      * @param timeout   a timeout. zero means no time limitation
  39      * @param target    a target to run
  40      * @throws NullPointerException     if target is null
  41      * @throws IllegalArgumentException if timeout is negative
  42      */
  43     public TimeLimitedRunner(long timeout, Callable<Boolean> target) {
  44         Objects.requireNonNull(target, "target must not be null");
  45         if (timeout < 0) {
  46             throw new IllegalArgumentException("timeout[" + timeout + "] < 0");
  47         }
  48         this.stoptime = System.currentTimeMillis() + timeout;
  49         this.timeout = timeout;
  50         this.target = target;
  51     }
  52 
  53     /**
  54      * Runs @{linkplan target} while it returns true and timeout isn't exceeded
  55      */
  56     @Override
  57     public Void call() throws Exception {
  58         long maxDuration = 0L;
  59         long iterStart = System.currentTimeMillis();
  60         if (timeout != 0 && iterStart > stoptime) {
  61             return null;
  62         }
  63         while (target.call()) {
  64             if (timeout != 0) {
  65                 long iterDuration = System.currentTimeMillis() - iterStart;
  66                 maxDuration = Math.max(maxDuration, iterDuration);
  67                 iterStart = System.currentTimeMillis();
  68                 if (iterStart + (maxDuration << 1) > stoptime) {
  69                     System.out.println("Not enough time to continue execution. "
  70                             + "Interrupted.");
  71                     break;
  72                 }
  73             }
  74         }
  75         return null;
  76     }
  77 
  78 }