/*

 * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/* @test

   @bug 6741890

   @summary Deadlock in Win32ShellFolderManager2

   @author Pavel Porvatov

   @run main bug6741890

*/

import sun.awt.shell.ShellFolder;

import java.io.File;

import java.lang.reflect.Field;

import java.util.concurrent.Callable;

public class bug6741890 {

    /**

     * This mux is used to prevent NPE in the isLink and isFileSystem methods

     */

    private static final Object mux = new Object();

    private static final int COUNT = 100000;

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

        String tmpDir = System.getProperty("java.io.tmpdir");

        if (tmpDir.length() == 0) { //'java.io.tmpdir' isn't guaranteed to be defined

            tmpDir = System.getProperty("user.home");

        }

        final ShellFolder tmpFile = ShellFolder.getShellFolder(new File(tmpDir));

        System.out.println("Temp directory: " + tmpDir);

        System.out.println("Stress test was run");

        Thread thread = new Thread() {

            public void run() {

                while (!isInterrupted()) {

                    ShellFolder.invoke(new Callable<Void>() {

                        public Void call() throws Exception {

                            synchronized (mux) {

                                tmpFile.isFileSystem();

                                tmpFile.isLink();

                            }

                            return null;

                        }

                    });

                }

            }

        };

        thread.start();

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

            synchronized (mux) {

                clearField(tmpFile, "cachedIsLink");

                clearField(tmpFile, "cachedIsFileSystem");

            }

            tmpFile.isFileSystem();

            tmpFile.isLink();

        }

        thread.interrupt();

        thread.join();

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

    }

    private static void clearField(Object o, String fieldName) throws Exception {

        Field field = o.getClass().getDeclaredField(fieldName);

        field.setAccessible(true);

        field.set(o, null);

    }

}