--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/nio/channels/AsynchronousChannelGroup/Unbounded.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,120 @@
+/*
+ * 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 4607272
+ * @summary Unit test for AsynchronousChannelGroup
+ */
+
+import java.nio.ByteBuffer;
+import java.nio.channels.*;
+import java.net.*;
+import java.util.concurrent.*;
+import java.io.IOException;
+
+public class Unbounded {
+    // number of concurrent completion handlers
+    static final int CONCURRENCY_COUNT = 512;
+
+    public static void main(String[] args) throws Exception {
+        // all accepted connections are added to a queue
+        final ArrayBlockingQueue<AsynchronousSocketChannel> queue =
+            new ArrayBlockingQueue<AsynchronousSocketChannel>(CONCURRENCY_COUNT);
+
+        // create listener to accept connections
+        final AsynchronousServerSocketChannel listener =
+            AsynchronousServerSocketChannel.open()
+                .bind(new InetSocketAddress(0));
+        listener.accept(null, new CompletionHandler<AsynchronousSocketChannel,Void>() {
+            public void completed(AsynchronousSocketChannel ch, Void att) {
+                queue.add(ch);
+                listener.accept(null, this);
+            }
+            public void failed(Throwable exc, Void att) {
+            }
+            public void cancelled(Void att) {
+            }
+        });
+        System.out.println("Listener created.");
+
+        // establish lots of connections
+        int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort();
+        SocketAddress sa = new InetSocketAddress(InetAddress.getLocalHost(), port);
+        AsynchronousSocketChannel[] channels =
+            new AsynchronousSocketChannel[CONCURRENCY_COUNT];
+        for (int i=0; i<CONCURRENCY_COUNT; i++) {
+            int attempts = 0;
+            for (;;) {
+                try {
+                    channels[i] = AsynchronousSocketChannel.open();
+                    channels[i].connect(sa).get();
+                    break;
+                } catch (IOException x) {
+                    // probably resource issue so back off and retry
+                    if (++attempts >= 3)
+                        throw x;
+                    Thread.sleep(50);
+                }
+            }
+        }
+        System.out.println("All connection established.");
+
+        // the barrier where all threads (plus the main thread) wait
+        final CyclicBarrier barrier = new CyclicBarrier(CONCURRENCY_COUNT+1);
+
+        // initiate a read operation on each channel.
+        for (int i=0; i<CONCURRENCY_COUNT; i++) {
+            ByteBuffer buf = ByteBuffer.allocateDirect(100);
+            channels[i].read( buf, channels[i],
+                new CompletionHandler<Integer,AsynchronousSocketChannel>() {
+                    public void completed(Integer bytesRead, AsynchronousSocketChannel ch) {
+                        try {
+                            ch.close();
+                            barrier.await();
+                        } catch (Exception x) {
+                            throw new AssertionError(x);
+                        }
+                    }
+                    public void failed(Throwable exc, AsynchronousSocketChannel ch) {
+                    }
+                    public void cancelled(AsynchronousSocketChannel ch) {
+                    }
+                });
+        }
+        System.out.println("All read operations outstanding.");
+
+        // write data to each of the accepted connections
+        int remaining = CONCURRENCY_COUNT;
+        while (remaining > 0) {
+            AsynchronousSocketChannel ch = queue.take();
+            ch.write(ByteBuffer.wrap("welcome".getBytes())).get();
+            ch.close();
+            remaining--;
+        }
+
+        // wait for all threads to reach the barrier
+        System.out.println("Waiting for all threads to reach barrier");
+        barrier.await();
+        listener.close();
+    }
+}