--- /dev/null	Mon Apr 27 18:44:20 2009
+++ new/test/java/nio/channels/AsynchronousSocketChannel/StressLoopback.java	Mon Apr 27 18:44:19 2009
@@ -0,0 +1,180 @@
+/*
+ * Copyright 2008-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 6834246
+ * @summary Stress test connections through the loopback interface
+ */
+
+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;
+        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");
+        }
+        if (failed)
+            throw new RuntimeException("Test failed - see log for details");
+    }
+
+    /**
+     * 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, 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, null, this);
+                    }
+                }
+                public void failed(Throwable exc, Void att) {
+                    exc.printStackTrace();
+                    closeUnchecked(channel);
+                }
+                public void cancelled(Void att) {
+                }
+            });
+        }
+
+        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, 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, null, this);
+                    }
+                }
+                public void failed(Throwable exc, Void att) {
+                    exc.printStackTrace();
+                    closeUnchecked(channel);
+                }
+                public void cancelled(Void att) {
+                }
+            });
+        }
+
+        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) { }
+    }
+}