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StressLoopback.java
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StressLoopback.java
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/*
* Copyright (c) 2008, 2015, 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 6834246 6842687 8133647
* @summary Stress test connections through the loopback interface
* @run main StressLoopback
* @run main/othervm -Djdk.net.useFastTcpLoopback StressLoopback
*/
import java.nio.ByteBuffer;
import java.net.*;
import java.nio.channels.*;
import java.util.Random;
import java.io.IOException;
public class StressLoopback {
static final Random rand = new Random();
public static void main(String[] args) throws Exception {
// setup listener
AsynchronousServerSocketChannel listener =
AsynchronousServerSocketChannel.open().bind(new InetSocketAddress(0));
int port =((InetSocketAddress)(listener.getLocalAddress())).getPort();
InetAddress lh = InetAddress.getLocalHost();
SocketAddress remote = new InetSocketAddress(lh, port);
// create sources and sinks
int count = 2 + rand.nextInt(9);
Source[] source = new Source[count];
Sink[] sink = new Sink[count];
for (int i=0; i<count; i++) {
AsynchronousSocketChannel ch = AsynchronousSocketChannel.open();
ch.connect(remote).get();
source[i] = new Source(ch);
sink[i] = new Sink(listener.accept().get());
}
// start the sinks and sources
for (int i=0; i<count; i++) {
sink[i].start();
source[i].start();
}
// let the test run for a while
Thread.sleep(20*1000);
// wait until everyone is done
boolean failed = false;
long total = 0L;
for (int i=0; i<count; i++) {
long nwrote = source[i].finish();
long nread = sink[i].finish();
if (nread != nwrote)
failed = true;
System.out.format("%d -> %d (%s)\n",
nwrote, nread, (failed) ? "FAIL" : "PASS");
total += nwrote;
}
if (failed)
throw new RuntimeException("Test failed - see log for details");
System.out.format("Total sent %d MB\n", total / (1024L * 1024L));
}
/**
* Writes bytes to a channel until "done". When done the channel is closed.
*/
static class Source {
private final AsynchronousByteChannel channel;
private final ByteBuffer sentBuffer;
private volatile long bytesSent;
private volatile boolean finished;
Source(AsynchronousByteChannel channel) {
this.channel = channel;
int size = 1024 + rand.nextInt(10000);
this.sentBuffer = (rand.nextBoolean()) ?
ByteBuffer.allocateDirect(size) : ByteBuffer.allocate(size);
}
void start() {
sentBuffer.position(0);
sentBuffer.limit(sentBuffer.capacity());
channel.write(sentBuffer, (Void)null, new CompletionHandler<Integer,Void> () {
public void completed(Integer nwrote, Void att) {
bytesSent += nwrote;
if (finished) {
closeUnchecked(channel);
} else {
sentBuffer.position(0);
sentBuffer.limit(sentBuffer.capacity());
channel.write(sentBuffer, (Void)null, this);
}
}
public void failed(Throwable exc, Void att) {
exc.printStackTrace();
closeUnchecked(channel);
}
});
}
long finish() {
finished = true;
waitUntilClosed(channel);
return bytesSent;
}
}
/**
* Read bytes from a channel until EOF is received.
*/
static class Sink {
private final AsynchronousByteChannel channel;
private final ByteBuffer readBuffer;
private volatile long bytesRead;
Sink(AsynchronousByteChannel channel) {
this.channel = channel;
int size = 1024 + rand.nextInt(10000);
this.readBuffer = (rand.nextBoolean()) ?
ByteBuffer.allocateDirect(size) : ByteBuffer.allocate(size);
}
void start() {
channel.read(readBuffer, (Void)null, new CompletionHandler<Integer,Void> () {
public void completed(Integer nread, Void att) {
if (nread < 0) {
closeUnchecked(channel);
} else {
bytesRead += nread;
readBuffer.clear();
channel.read(readBuffer, (Void)null, this);
}
}
public void failed(Throwable exc, Void att) {
exc.printStackTrace();
closeUnchecked(channel);
}
});
}
long finish() {
waitUntilClosed(channel);
return bytesRead;
}
}
static void waitUntilClosed(Channel c) {
while (c.isOpen()) {
try {
Thread.sleep(100);
} catch (InterruptedException ignore) { }
}
}
static void closeUnchecked(Channel c) {
try {
c.close();
} catch (IOException ignore) { }
}
}