--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/io/NetworkTrafficListener.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,99 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.io;
+
+import java.net.Socket;
+
+/**
+ * <p>A listener for raw network traffic within Jetty.</p>
+ * <p>{@link NetworkTrafficListener}s can be installed in a
+ * <code>org.eclipse.jetty.server.nio.NetworkTrafficSelectChannelConnector</code>,
+ * and are notified of the following network traffic events:</p>
+ * <ul>
+ * <li>Connection opened, when the server has accepted the connection from a remote client</li>
+ * <li>Incoming bytes, when the server receives bytes sent from a remote client</li>
+ * <li>Outgoing bytes, when the server sends bytes to a remote client</li>
+ * <li>Connection closed, when the server has closed the connection to a remote client</li>
+ * </ul>
+ * <p>{@link NetworkTrafficListener}s can be used to log the network traffic viewed by
+ * a Jetty server (for example logging to filesystem) for activities such as debugging
+ * or request/response cycles or for replaying request/response cycles to other servers.</p>
+ */
+public interface NetworkTrafficListener
+{
+    /**
+     * <p>Callback method invoked when a connection from a remote client has been accepted.</p>
+     * <p>The {@code socket} parameter can be used to extract socket address information of
+     * the remote client.</p>
+     *
+     * @param socket the socket associated with the remote client
+     */
+    public void opened(Socket socket);
+
+    /**
+     * <p>Callback method invoked when bytes sent by a remote client arrived on the server.</p>
+     *
+     * @param socket the socket associated with the remote client
+     * @param bytes  the read-only buffer containing the incoming bytes
+     */
+    public void incoming(Socket socket, Buffer bytes);
+
+    /**
+     * <p>Callback method invoked when bytes are sent to a remote client from the server.</p>
+     * <p>This method is invoked after the bytes have been actually written to the remote client.</p>
+     *
+     * @param socket the socket associated with the remote client
+     * @param bytes  the read-only buffer containing the outgoing bytes
+     */
+    public void outgoing(Socket socket, Buffer bytes);
+
+    /**
+     * <p>Callback method invoked when a connection to a remote client has been closed.</p>
+     * <p>The {@code socket} parameter is already closed when this method is called, so it
+     * cannot be queried for socket address information of the remote client.<br />
+     * However, the {@code socket} parameter is the same object passed to {@link #opened(Socket)},
+     * so it is possible to map socket information in {@link #opened(Socket)} and retrieve it
+     * in this method.
+     *
+     * @param socket the (closed) socket associated with the remote client
+     */
+    public void closed(Socket socket);
+
+    /**
+     * <p>A commodity class that implements {@link NetworkTrafficListener} with empty methods.</p>
+     */
+    public static class Empty implements NetworkTrafficListener
+    {
+        public void opened(Socket socket)
+        {
+        }
+
+        public void incoming(Socket socket, Buffer bytes)
+        {
+        }
+
+        public void outgoing(Socket socket, Buffer bytes)
+        {
+        }
+
+        public void closed(Socket socket)
+        {
+        }
+    }
+}