/*

 * 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 6631352

 * @summary Check that appends are atomic

 */

import java.io.File;

import java.io.FileOutputStream;

import java.util.concurrent.Executors;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.TimeUnit;

public class AtomicAppend {

    // Before the fix for

    // 6631352: Implement atomic append mode using FILE_APPEND_DATA (win)

    // this would fail intermittently on windows

    void test(String[] args) throws Throwable {

        final int nThreads = 10;

        final int writes = 1000;

        final File file = new File("foo");

        file.delete();

        try {

            final ExecutorService es = Executors.newFixedThreadPool(nThreads);

            for (int i = 0; i < nThreads; i++)

                es.execute(new Runnable() { public void run() {

                    try {

                        try (FileOutputStream s = new FileOutputStream(file, true)) {

                            for (int j = 0; j < 1000; j++) {

                                s.write((int) 'x');

                                s.flush();

                            }

                        }

                    } catch (Throwable t) { unexpected(t); }}});

            es.shutdown();

            es.awaitTermination(10L, TimeUnit.MINUTES);

            equal(file.length(), (long) (nThreads * writes));

        } finally {

            file.delete();

        }

    }

    //--------------------- Infrastructure ---------------------------

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        new AtomicAppend().instanceMain(args);}

    void instanceMain(String[] args) throws Throwable {

        try {test(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}