| /* |
| * Copyright (c) 2010, 2012, 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. |
| * |
| * 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 6934977 |
| * @summary Test MappedByteBuffer operations after mapped bye buffer becomes |
| * inaccessible |
| * @run main/othervm Truncate |
| */ |
| |
| import java.io.*; |
| import java.nio.*; |
| import java.nio.channels.*; |
| import java.util.concurrent.Callable; |
| |
| public class Truncate { |
| |
| static final long INITIAL_FILE_SIZE = 32000L; |
| static final long TRUNCATED_FILE_SIZE = 512L; |
| |
| public static void main(String[] args) throws Exception { |
| File blah = File.createTempFile("blah", null); |
| blah.deleteOnExit(); |
| |
| final FileChannel fc = new RandomAccessFile(blah, "rw").getChannel(); |
| fc.position(INITIAL_FILE_SIZE).write(ByteBuffer.wrap("THE END".getBytes())); |
| final MappedByteBuffer mbb = |
| fc.map(FileChannel.MapMode.READ_WRITE, 0, fc.size()); |
| boolean truncated; |
| try { |
| fc.truncate(TRUNCATED_FILE_SIZE); |
| truncated = true; |
| } catch (IOException ioe) { |
| // probably on Windows where a file cannot be truncated when |
| // there is a file mapping. |
| truncated = false; |
| } |
| if (truncated) { |
| // Test 1: access region that is no longer accessible |
| execute(new Callable<Void>() { |
| public Void call() { |
| mbb.get((int)TRUNCATED_FILE_SIZE + 1); |
| mbb.put((int)TRUNCATED_FILE_SIZE + 2, (byte)123); |
| return null; |
| } |
| }); |
| // Test 2: load buffer into memory |
| execute(new Callable<Void>() { |
| public Void call() throws IOException { |
| mbb.load(); |
| return null; |
| } |
| }); |
| } |
| fc.close(); |
| } |
| |
| // Runs the given task in its own thread. If operating correcting the |
| // the thread will terminate with an InternalError as the mapped buffer |
| // is inaccessible. |
| static void execute(final Callable<?> c) { |
| Runnable r = new Runnable() { |
| public void run() { |
| try { |
| Object ignore = c.call(); |
| } catch (Exception ignore) { |
| } |
| } |
| }; |
| Thread t = new Thread(r); |
| t.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() { |
| public void uncaughtException(Thread t, Throwable e) { |
| e.printStackTrace(); |
| } |
| }); |
| t.start(); |
| try { t.join(); } catch (InterruptedException ignore) { } |
| } |
| } |