1 /* 2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 6631352 27 * @summary Check that appends are atomic 28 */ 29 30 import java.io.File; 31 import java.io.FileOutputStream; 32 import java.util.concurrent.Executors; 33 import java.util.concurrent.ExecutorService; 34 import java.util.concurrent.TimeUnit; 35 36 public class AtomicAppend { 37 // Before the fix for 38 // 6631352: Implement atomic append mode using FILE_APPEND_DATA (win) 39 // this would fail intermittently on windows 40 void test(String[] args) throws Throwable { 41 final int nThreads = 10; 42 final int writes = 1000; 43 final File file = new File("foo"); 44 file.delete(); 45 try { 46 final ExecutorService es = Executors.newFixedThreadPool(nThreads); 47 for (int i = 0; i < nThreads; i++) 48 es.execute(new Runnable() { public void run() { 49 try { 50 try (FileOutputStream s = new FileOutputStream(file, true)) { 51 for (int j = 0; j < 1000; j++) { 52 s.write((int) 'x'); 53 s.flush(); 54 } 55 } 56 } catch (Throwable t) { unexpected(t); }}}); 57 es.shutdown(); 58 es.awaitTermination(10L, TimeUnit.MINUTES); 59 equal(file.length(), (long) (nThreads * writes)); 60 } finally { 61 file.delete(); 62 } 63 } 64 65 //--------------------- Infrastructure --------------------------- 66 volatile int passed = 0, failed = 0; 67 void pass() {passed++;} 68 void fail() {failed++; Thread.dumpStack();} 69 void fail(String msg) {System.err.println(msg); fail();} 70 void unexpected(Throwable t) {failed++; t.printStackTrace();} 71 void check(boolean cond) {if (cond) pass(); else fail();} 72 void equal(Object x, Object y) { 73 if (x == null ? y == null : x.equals(y)) pass(); 74 else fail(x + " not equal to " + y);} 75 public static void main(String[] args) throws Throwable { 76 new AtomicAppend().instanceMain(args);} 77 void instanceMain(String[] args) throws Throwable { 78 try {test(args);} catch (Throwable t) {unexpected(t);} 79 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 80 if (failed > 0) throw new AssertionError("Some tests failed");} 81 }