TimeLimitedRunner.java revision 2646:4c12464a907d 
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
24package jdk.test.lib;
25
26import java.util.Objects;
27import java.util.concurrent.Callable;
28
29/**
30 * Auxiliary class to run target w/ given timeout.
31 */
32public 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}
87