InfiniteLoop.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;
27
28/**
29 * Class which runs another Runnable in infinite loop with certain pauses
30 * between cycles.
31 */
32public 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}
67