/*

 * Copyright (c) 2016, 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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 */

/*

 * @test

 * @library /test/lib

 * @summary Test that redefinition reuses metaspace blocks that are freed

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

 * @modules java.instrument

 *          jdk.jartool/sun.tools.jar

 * @run main RedefineLeak buildagent

 * @run main/othervm/timeout=6000  RedefineLeak runtest

 */

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.lang.RuntimeException;

import java.lang.instrument.ClassFileTransformer;

import java.lang.instrument.Instrumentation;

import java.security.ProtectionDomain;

import java.lang.instrument.IllegalClassFormatException;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

public class RedefineLeak {

    static class Tester {}

    static class LoggingTransformer implements ClassFileTransformer {

        static int transformCount = 0;

        public LoggingTransformer() {}

        public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined,

            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {

            transformCount++;

            if (transformCount % 1000 == 0) System.out.println("transformCount:" + transformCount);

            return null;

        }

    }

    public static void premain(String agentArgs, Instrumentation inst) throws Exception {

        LoggingTransformer t = new LoggingTransformer();

        inst.addTransformer(t, true);

        {

            Class demoClass = Class.forName("RedefineLeak$Tester");

            for (int i = 0; i < 10000; i++) {

               inst.retransformClasses(demoClass);

            }

        }

        System.gc();

    }

    private static void buildAgent() {

        try {

            ClassFileInstaller.main("RedefineLeak");

        } catch (Exception e) {

            throw new RuntimeException("Could not write agent classfile", e);

        }

        try {

            PrintWriter pw = new PrintWriter("MANIFEST.MF");

            pw.println("Premain-Class: RedefineLeak");

            pw.println("Agent-Class: RedefineLeak");

            pw.println("Can-Redefine-Classes: true");

            pw.println("Can-Retransform-Classes: true");

            pw.close();

        } catch (FileNotFoundException e) {

            throw new RuntimeException("Could not write manifest file for the agent", e);

        }

        sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");

        if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineLeak.class" })) {

            throw new RuntimeException("Could not write the agent jar file");

        }

    }

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

        if (argv.length == 1 && argv[0].equals("buildagent")) {

            buildAgent();

            return;

        }

        if (argv.length == 1 && argv[0].equals("runtest")) {

            // run outside of jtreg to not OOM on jtreg classes that are loaded after metaspace is full

            String[] javaArgs1 = { "-XX:MetaspaceSize=12m", "-XX:MaxMetaspaceSize=12m",

                                   "-javaagent:redefineagent.jar", "RedefineLeak"};

            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(javaArgs1);

            OutputAnalyzer output = new OutputAnalyzer(pb.start());

            output.shouldContain("transformCount:10000");

        }

    }

}