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/*
* Copyright (c) 2010, 2011, 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 6979009
* @summary Ensure ClosedByInterruptException is thrown when I/O operation
* interrupted by Thread.interrupt
* @key randomness
*/
import java.io.*;
import java.util.Random;
import java.nio.ByteBuffer;
import java.nio.channels.*;
public class ClosedByInterrupt {
static final int K = 1024;
static final Random rand = new Random();
static volatile boolean failed;
public static void main(String[] args) throws Exception {
File f = File.createTempFile("blah", null);
f.deleteOnExit();
// create 1MB file.
byte[] b = new byte[K*K];
rand.nextBytes(b);
ByteBuffer bb = ByteBuffer.wrap(b);
try (FileChannel fc = new FileOutputStream(f).getChannel()) {
while (bb.hasRemaining())
fc.write(bb);
}
// test with 1-16 concurrent threads
for (int i=1; i<=16; i++) {
System.out.format("%d thread(s)%n", i);
test(f, i);
if (failed)
break;
}
if (failed)
throw new RuntimeException("Test failed");
}
/**
* Starts "nThreads" that do I/O on the given file concurrently. Continuously
* interrupts one of the threads to cause the file to be closed and
* ClosedByInterruptException to be thrown. The other threads should "fail" with
* ClosedChannelException (or the more specific AsynchronousCloseException).
*/
static void test(File f, int nThreads) throws Exception {
try (FileChannel fc = new RandomAccessFile(f, "rwd").getChannel()) {
Thread[] threads = new Thread[nThreads];
// start threads
for (int i=0; i<nThreads; i++) {
boolean interruptible = (i==0);
ReaderWriter task = new ReaderWriter(fc, interruptible);
Thread t = new Thread(task);
t.start();
threads[i] = t;
}
// give time for threads to start
Thread.sleep(500 + rand.nextInt(1000));
// interrupt thread until channel is closed
while (fc.isOpen()) {
threads[0].interrupt();
Thread.sleep(rand.nextInt(50));
}
// wait for test to finish
for (int i=0; i<nThreads; i++) {
threads[i].join();
}
}
}
/**
* A task that continuously reads or writes to random areas of a file
* until the channel is closed. An "interruptible" task expects the
* channel to be closed by an interupt, a "non-interruptible" thread
* does not.
*/
static class ReaderWriter implements Runnable {
final FileChannel fc;
final boolean interruptible;
final boolean writer;
ReaderWriter(FileChannel fc, boolean interruptible) {
this.fc = fc;
this.interruptible = interruptible;
this.writer = rand.nextBoolean();
}
public void run() {
ByteBuffer bb = ByteBuffer.allocate(K);
if (writer)
rand.nextBytes(bb.array());
try {
for (;;) {
long position = rand.nextInt(K*K - bb.capacity());
if (writer) {
bb.position(0).limit(bb.capacity());
fc.write(bb, position);
} else {
bb.clear();
fc.read(bb, position);
}
if (!interruptible) {
// give the interruptible thread a chance
try {
Thread.sleep(rand.nextInt(50));
} catch (InterruptedException e) {
unexpected(e);
}
}
}
} catch (ClosedByInterruptException e) {
if (interruptible) {
if (Thread.interrupted()) {
expected(e + " thrown and interrupt status set");
} else {
unexpected(e + " thrown but interrupt status not set");
}
} else {
unexpected(e);
}
} catch (ClosedChannelException e) {
if (interruptible) {
unexpected(e);
} else {
expected(e);
}
} catch (Exception e) {
unexpected(e);
}
}
}
static void expected(Exception e) {
System.out.format("%s (expected)%n", e);
}
static void expected(String msg) {
System.out.format("%s (expected)%n", msg);
}
static void unexpected(Exception e) {
System.err.format("%s (not expected)%n", e);
failed = true;
}
static void unexpected(String msg) {
System.err.println(msg);
failed = true;
}
}
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