/*

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 * 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.

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/**

 * @test CompressedClassSpaceSizeInJmapHeap

 * @bug 8004924

 * @summary Checks that jmap -heap contains the flag CompressedClassSpaceSize

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:CompressedClassSpaceSize=50m CompressedClassSpaceSizeInJmapHeap

 */

import jdk.test.lib.JDKToolLauncher;

import jdk.test.lib.Platform;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import java.nio.file.*;

import java.io.File;

import java.nio.charset.Charset;

import java.util.List;

public class CompressedClassSpaceSizeInJmapHeap {

    // Note that on some platforms it may require root privileges to run this test.

    public static void main(String[] args) throws Exception {

        if (!Platform.is64bit()) {

            // Compressed Class Space is only available on 64-bit JVMs

            return;

        }

        String pid = Long.toString(ProcessTools.getProcessId());

        JDKToolLauncher jmap = JDKToolLauncher.create("jhsdb")

                                              .addToolArg("jmap")

                                              .addToolArg("--heap")

                                              .addToolArg("--pid")

                                              .addToolArg(pid);

        ProcessBuilder pb = new ProcessBuilder(jmap.getCommand());

        File out = new File("CompressedClassSpaceSizeInJmapHeap.stdout.txt");

        pb.redirectOutput(out);

        File err = new File("CompressedClassSpaceSizeInJmapHeap.stderr.txt");

        pb.redirectError(err);

        run(pb);

        OutputAnalyzer output = new OutputAnalyzer(read(out));

        output.shouldContain("CompressedClassSpaceSize = 52428800 (50.0MB)");

        out.delete();

    }

    private static void run(ProcessBuilder pb) throws Exception {

        Process p = pb.start();

        p.waitFor();

        int exitValue = p.exitValue();

        if (exitValue != 0) {

            throw new Exception("jmap -heap exited with error code: " + exitValue);

        }

    }

    private static String read(File f) throws Exception {

        Path p = f.toPath();

        List<String> lines = Files.readAllLines(p, Charset.defaultCharset());

        StringBuilder sb = new StringBuilder();

        for (String line : lines) {

            sb.append(line).append('\n');

        }

        return sb.toString();

    }

}