2625N/A/*
2625N/A * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
2625N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
2625N/A *
2625N/A * This code is free software; you can redistribute it and/or modify it
2625N/A * under the terms of the GNU General Public License version 2 only, as
2625N/A * published by the Free Software Foundation.
2625N/A *
2625N/A * This code is distributed in the hope that it will be useful, but WITHOUT
2625N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
2625N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
2625N/A * version 2 for more details (a copy is included in the LICENSE file that
2625N/A * accompanied this code).
2625N/A *
2625N/A * You should have received a copy of the GNU General Public License version
2625N/A * 2 along with this work; if not, write to the Free Software Foundation,
2625N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
2625N/A *
2625N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2625N/A * or visit www.oracle.com if you need additional information or have any
2625N/A * questions.
2625N/A */
2625N/A
2625N/A/* @test
2625N/A * @bug 6934977
2625N/A * @summary Test MappedByteBuffer operations after mapped bye buffer becomes
2625N/A * inaccessible
2625N/A * @run main/othervm Truncate
2625N/A */
2625N/A
2625N/Aimport java.io.*;
2625N/Aimport java.nio.*;
2625N/Aimport java.nio.channels.*;
2625N/Aimport java.util.concurrent.Callable;
2625N/A
2625N/Apublic class Truncate {
2625N/A
2625N/A static final long INITIAL_FILE_SIZE = 32000L;
2625N/A static final long TRUNCATED_FILE_SIZE = 512L;
2625N/A
2625N/A public static void main(String[] args) throws Exception {
2625N/A File blah = File.createTempFile("blah", null);
2625N/A blah.deleteOnExit();
2625N/A
2625N/A final FileChannel fc = new RandomAccessFile(blah, "rw").getChannel();
2625N/A fc.position(INITIAL_FILE_SIZE).write(ByteBuffer.wrap("THE END".getBytes()));
2625N/A final MappedByteBuffer mbb =
2625N/A fc.map(FileChannel.MapMode.READ_WRITE, 0, fc.size());
2625N/A boolean truncated;
2625N/A try {
2625N/A fc.truncate(TRUNCATED_FILE_SIZE);
2625N/A truncated = true;
2625N/A } catch (IOException ioe) {
2625N/A // probably on Windows where a file cannot be truncated when
2625N/A // there is a file mapping.
2625N/A truncated = false;
2625N/A }
2625N/A if (truncated) {
2625N/A // Test 1: access region that is no longer accessible
2625N/A execute(new Callable<Void>() {
2625N/A public Void call() {
2625N/A mbb.get((int)TRUNCATED_FILE_SIZE + 1);
2625N/A mbb.put((int)TRUNCATED_FILE_SIZE + 2, (byte)123);
2625N/A return null;
2625N/A }
2625N/A });
2625N/A // Test 2: load buffer into memory
2625N/A execute(new Callable<Void>() {
2625N/A public Void call() throws IOException {
2625N/A mbb.load();
2625N/A return null;
2625N/A }
2625N/A });
2625N/A }
2625N/A fc.close();
2625N/A }
2625N/A
2625N/A // Runs the given task in its own thread. If operating correcting the
2625N/A // the thread will terminate with an InternalError as the mapped buffer
2625N/A // is inaccessible.
2625N/A static void execute(final Callable<?> c) {
2625N/A Runnable r = new Runnable() {
2625N/A public void run() {
2625N/A try {
2625N/A Object ignore = c.call();
2625N/A } catch (Exception ignore) {
2625N/A }
2625N/A }
2625N/A };
2625N/A Thread t = new Thread(r);
5061N/A t.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
5061N/A public void uncaughtException(Thread t, Throwable e) {
5061N/A e.printStackTrace();
5061N/A }
5061N/A });
2625N/A t.start();
2625N/A try { t.join(); } catch (InterruptedException ignore) { }
2625N/A }
2625N/A}