test/hotspot/jtreg/gc/stress/gcbasher/TestGCBasher.java

/*
 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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import java.io.IOException;
import java.net.URI;
import java.nio.file.FileSystems;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.stream.Stream;

public class TestGCBasher {
    private static void parseClassFiles() throws IOException {
        HashMap<String, ClassInfo> deps = new HashMap<>();

        FileSystem fs = FileSystems.getFileSystem(URI.create("jrt:/"));
        Stream<Path> s = Files.walk(fs.getPath("/"));
        for (Path p : (Iterable<Path>)s::iterator) {
            if (p.toString().endsWith(".class") &&
                !p.getFileName().toString().equals("module-info.class")) {
                byte[] data = Files.readAllBytes(p);
                Decompiler d = new Decompiler(data);
                ClassInfo ci = d.getClassInfo();
                deps.put(ci.getName(), ci);
            }
        }
    }

    public static void main(String[] args) throws IOException {
        if (args.length != 1) {
            System.err.println("Usage: TestGCBasher <duration-ms>");
            return;
        }

        long durationMillis = Long.valueOf(args[0]);
        long start = System.currentTimeMillis();
        while (System.currentTimeMillis() - start < durationMillis) {
            parseClassFiles();
        }
    }
}