/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 * @test

 * @bug     6799583

 *

 * @summary Test verifes that LogManager shutdown hook does not cause

 *          an application classloader leaks.

 *

 * @run     main/othervm ClassLoaderLeakTest

 */

import java.io.File;

import java.lang.ref.WeakReference;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.concurrent.CountDownLatch;

import java.util.logging.Logger;

import java.util.logging.Logger;

public class ClassLoaderLeakTest {

    private static CountDownLatch doneSignal;

    private static CountDownLatch launchSignal;

    private static ThreadGroup appsThreadGroup;

    private static Throwable launchFailure = null;

    public static void main(String[] args) {

        appsThreadGroup = new ThreadGroup("MyAppsThreadGroup");

        doneSignal = new CountDownLatch(1);

        launchSignal = new CountDownLatch(1);

        Runnable launcher = new Runnable() {

            public void run() {

                try {

                    ClassLoader cl =

                        Thread.currentThread().getContextClassLoader();

                    Class appMain = cl.loadClass("AppTest");

                    Method launch =

                        appMain.getDeclaredMethod("launch", doneSignal.getClass());

                    Constructor c = appMain.getConstructor();

                    Object o = c.newInstance();

                    launch.invoke(o, doneSignal);

                } catch (Throwable e) {

                    launchFailure = e;

                } finally {

                    launchSignal.countDown();

                }

            }

        };

        /* prepare test  class loader */

        URL pwd = null;

        try {

            pwd = new File(System.getProperty("test.classes",".")).toURL();

        } catch (MalformedURLException e) {

            throw new RuntimeException("Test failed.", e);

        }

        URL[] urls = new URL[] { pwd };

         MyClassLoader appClassLoader = new MyClassLoader(urls, "test0");

         WeakReference<MyClassLoader> ref =

                 new WeakReference<>(appClassLoader);

         Thread appThread = new Thread(appsThreadGroup, launcher, "AppThread-0");

         appThread.setContextClassLoader(appClassLoader);

         appThread.start();

         appClassLoader = null;

         launcher = null;

         appThread = null;

         /* wait for laucnh completion */

         try {

             launchSignal.await();

         } catch (InterruptedException e) {

         }

         /* check if launch failed */

         if (launchFailure != null) {

             throw new RuntimeException("Test failed.", launchFailure);

         }

         /* wait for test app excution completion */

         try {

             doneSignal.await();

         } catch (InterruptedException e) {

         }

         /* give a chence to GC */

         waitAndGC(5);

         if (ref.get() != null) {

             throw new RuntimeException("Test failed: classloader is still alive");

         }

         System.out.println("Test passed.");

    }

    private static class MyClassLoader extends URLClassLoader {

        private static boolean verbose =

            Boolean.getBoolean("verboseClassLoading");

        private String uniqClassName;

        public MyClassLoader(URL[] urls, String uniq) {

            super(urls);

            uniqClassName = uniq;

        }

        public Class loadClass(String name) throws ClassNotFoundException {

            if (verbose) {

                System.out.printf("%s: load class %s\n", uniqClassName, name);

            }

            if (uniqClassName.equals(name)) {

                return Object.class;

            }

            return super.loadClass(name);

        }

        public String toString() {

            return "MyClassLoader(" + uniqClassName + ")";

        }

    }

    private static void waitAndGC(int sec) {

        int cnt = sec;

        System.out.print("Wait ");

        while (cnt-- > 0) {

            try {

                Thread.sleep(1000);

            } catch (InterruptedException e) {

            }

            // do GC every 3 seconds

            if (cnt % 3 == 2) {

                System.gc();

                System.out.print("+");

            } else {

                System.out.print(".");

            }

            //checkErrors();

        }

        System.out.println("");

    }

}

class AppTest {

    public AppTest() {

    }

    public void launch(CountDownLatch done) {

        Logger log = Logger.getLogger("app_test_logger");

        log.fine("Test app is launched");

        done.countDown();

    }

}