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 double            factor;

    36     private final Callable<Boolean> target;

    37 

    38     /**

    39      * @param timeout   a timeout. zero means no time limitation

    40      * @param factor    a multiplier used to estimate next iteration time

    41      * @param target    a target to run

    42      * @throws NullPointerException     if target is null

    43      * @throws IllegalArgumentException if timeout is negative or

    44                                         factor isn't positive

    45      */

    46     public TimeLimitedRunner(long timeout, double factor,

    47             Callable<Boolean> target) {

    48         Objects.requireNonNull(target, "target must not be null");

    49         if (timeout < 0) {

    50             throw new IllegalArgumentException("timeout[" + timeout + "] < 0");

    51         }

    52         if (factor <= 0d) {

    53             throw new IllegalArgumentException("factor[" + factor + "] <= 0");

    54         }

    55         this.stoptime = System.currentTimeMillis() + timeout;

    56         this.timeout = timeout;

    57         this.factor = factor;

    58         this.target = target;

    59     }

    60 

    61     /**

    62      * Runs @{linkplan target} while it returns true and timeout isn't exceeded

    63      */

    64     @Override

    65     public Void call() throws Exception {

    66         long maxDuration = 0L;

    67         long iterStart = System.currentTimeMillis();

    68         if (timeout != 0 && iterStart > stoptime) {

    69             return null;

    70         }

    71         while (target.call()) {

    72             if (timeout != 0) {

    73                 long iterDuration = System.currentTimeMillis() - iterStart;

    74                 maxDuration = Math.max(maxDuration, iterDuration);

    75                 iterStart = System.currentTimeMillis();

    76                 if (iterStart + (maxDuration * factor) > stoptime) {

    77                     System.out.println("Not enough time to continue execution. "

    78                             + "Interrupted.");

    79                     break;

    80                 }

    81             }

    82         }

    83         return null;

    84     }

    85 

    86 }