/*

 * Copyright (c) 2008, 2011, 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.

 *

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 */

/* @test

 * @bug 4313887

 * @summary Sanity test for Sun-specific sensitivyt level watch event modifier

 * @library ..

 * @run main/timeout=330 Basic

 */

import java.nio.file.*;

import java.io.OutputStream;

import java.io.IOException;

import java.util.Random;

import java.util.concurrent.TimeUnit;

import com.sun.nio.file.SensitivityWatchEventModifier;

public class SensitivityModifier {

    static final Random rand = new Random();

    static void register(Path[] dirs, WatchService watcher) throws IOException {

        SensitivityWatchEventModifier[] sensitivtives =

            SensitivityWatchEventModifier.values();

        for (int i=0; i<dirs.length; i++) {

            SensitivityWatchEventModifier sensivity =

                sensitivtives[ rand.nextInt(sensitivtives.length) ];

            Path dir = dirs[i];

            dir.register(watcher, new WatchEvent.Kind<?>[]{ ENTRY_MODIFY }, sensivity);

        }

    }

    @SuppressWarnings("unchecked")

    static void doTest(Path top) throws Exception {

        FileSystem fs = top.getFileSystem();

        WatchService watcher = fs.newWatchService();

        // create directories and files

        int nDirs = 5 + rand.nextInt(20);

        int nFiles = 50 + rand.nextInt(50);

        Path[] dirs = new Path[nDirs];

        Path[] files = new Path[nFiles];

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

            dirs[i] = Files.createDirectory(top.resolve("dir" + i));

        }

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

            Path dir = dirs[rand.nextInt(nDirs)];

            files[i] = Files.createFile(dir.resolve("file" + i));

        }

        // register the directories (random sensitivity)

        register(dirs, watcher);

        // sleep a bit here to ensure that modification to the first file

        // can be detected by polling implementations (ie: last modified time

        // may not change otherwise).

        try { Thread.sleep(1000); } catch (InterruptedException e) { }

        // modify files and check that events are received

        for (int i=0; i<10; i++) {

            Path file = files[rand.nextInt(nFiles)];

            System.out.println("Modify: " + file);

            try (OutputStream out = Files.newOutputStream(file)) {

                out.write(new byte[100]);

            }

            System.out.println("Waiting for event...");

            WatchKey key = watcher.take();

            WatchEvent<?> event = key.pollEvents().iterator().next();

            if (event.kind() != ENTRY_MODIFY)

                throw new RuntimeException("Unexpected event: " + event);

            Path name = ((WatchEvent<Path>)event).context();

            if (!name.equals(file.getFileName()))

                throw new RuntimeException("Unexpected context: " + name);

            System.out.println("Event OK");

            // drain events (to avoid interference)

            do {

                key.reset();

                key = watcher.poll(1, TimeUnit.SECONDS);

            } while (key != null);

            // re-register the directories to force changing their sensitivity

            // level

            register(dirs, watcher);

        }

        // done

        watcher.close();

    }

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

        Path dir = TestUtil.createTemporaryDirectory();

        try {

            doTest(dir);

        } finally {

            TestUtil.removeAll(dir);

        }

    }

}