/*
* 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) { }
}
}