// excerpts from http://code.google.com/p/muduo/
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the License file.
 //
 // Author: Shuo Chen (chenshuo at chenshuo dot com)
 
 #ifndef MUDUO_NET_CALLBACKS_H
 #define MUDUO_NET_CALLBACKS_H
 
 #include <boost/function.hpp>
 #include <boost/shared_ptr.hpp>
 
 #include "datetime/Timestamp.h"
 
 namespace muduo
 {
 
 // All client visible callbacks go here.
 
+class TcpConnection;
+typedef boost::shared_ptr<TcpConnection> TcpConnectionPtr;
+
 typedef boost::function<void()> TimerCallback;
+typedef boost::function<void (const TcpConnectionPtr&)> ConnectionCallback;
+typedef boost::function<void (const TcpConnectionPtr&,
+                              const char* data,
+                              ssize_t len)> MessageCallback;
 
 }
 
 #endif  // MUDUO_NET_CALLBACKS_H