TestGCBasher.java revision 12290:8953c0318163 
1/*
2 * Copyright (c) 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 */
24
25import java.io.IOException;
26import java.net.URI;
27import java.nio.file.FileSystems;
28import java.nio.file.FileSystem;
29import java.nio.file.Files;
30import java.nio.file.Path;
31import java.util.HashMap;
32import java.util.stream.Stream;
33
34public class TestGCBasher {
35    private static void parseClassFiles() throws IOException {
36        HashMap<String, ClassInfo> deps = new HashMap<>();
37
38        FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));
39        Stream<Path> s = Files.walk(fs.getPath("/"));
40        for (Path p : (Iterable<Path>)s::iterator) {
41            if (p.toString().endsWith(".class") &&
42                !p.getFileName().toString().equals("module-info.class")) {
43                byte[] data = Files.readAllBytes(p);
44                Decompiler d = new Decompiler(data);
45                ClassInfo ci = d.getClassInfo();
46                deps.put(ci.getName(), ci);
47            }
48        }
49    }
50
51    public static void run(String[] args) throws IOException {
52        if (args.length != 1) {
53            System.err.println("Usage: TestGCBasher <duration-ms>");
54            return;
55        }
56
57        long durationMillis = Long.valueOf(args[0]);
58        long start = System.currentTimeMillis();
59        while (System.currentTimeMillis() - start < durationMillis) {
60            parseClassFiles();
61        }
62    }
63}
64