MaxTime.java revision 8845:4be14673b9bf 
1/*
2 * Copyright (c) 2000, 2004, 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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27import java.io.FileNotFoundException;
28import java.io.IOException;
29import java.lang.reflect.Method;
30import java.net.URL;
31import java.net.URLClassLoader;
32import java.util.jar.Attributes;
33import java.util.jar.JarFile;
34
35/** Run an application (from a jar file) and terminate it after a given
36 *  number of seconds.
37 */
38
39public class MaxTime {
40
41    private static boolean debugFlag = false;
42
43
44    private static void debug(String s) {
45        if (debugFlag) {
46            System.err.println(s);
47        }
48    }
49
50
51    private static void usage() {
52        System.err.println(
53          "Usage:\n" +
54          "  java  MaxTime  <jarfile> <timeout>\n" +
55          "\n" +
56          "  <jarfile> is a jar file specifying an application to run\n" +
57          "  <timeout> is an integer number of seconds to allow the app to run." );
58        System.exit(1);
59    }
60
61
62    public static void main(String[] args) {
63        int timeoutPeriod = 0;
64        String mainClass = null;
65
66        if (args.length != 2)
67            usage();
68
69        // Identify the timeout value.
70        try {
71            timeoutPeriod = Integer.parseInt(args[1]);
72        } catch (Exception e) {
73            usage();
74        }
75
76        // Identify the application's main class.
77        try {
78            mainClass = new JarFile(args[0]).getManifest()
79                .getMainAttributes().getValue(Attributes.Name.MAIN_CLASS);
80        } catch (FileNotFoundException e) {
81            System.err.println("Can't find " + args[0]);
82            System.exit(1);
83        } catch (IOException e) {
84            e.printStackTrace();
85            System.exit(2);
86        }
87
88        // Set the exit timer.
89        final int timeout = timeoutPeriod * 1000;
90        new Thread() {
91            public void run() {
92                try {
93                    debug("Before timeout!");
94                    Thread.sleep(timeout);
95                    debug("After timeout!");
96                } catch (InterruptedException e) {
97                }
98                debug("Exit caused by timeout!");
99                System.exit(0);
100            }
101        }.start();
102
103
104        // Start up the app.
105        try {
106            ClassLoader cl = new URLClassLoader(
107                                   new URL[] {new URL("file:"+args[0])});
108            Class clazz = cl.loadClass(mainClass);
109            String[] objs = new String[0];
110            Method mainMethod = clazz.getMethod("main", new Class[]{objs.getClass()});
111            mainMethod.invoke(null, new Object[]{objs});
112        } catch (Exception e) {
113            e.printStackTrace();
114            System.exit(3);
115        }
116    }
117}
118