Tao 1.7.0 TODOs:
. HashedWheelTImer
. 使用反射改進Handler設計
. read about teleport
. Tao - Go語言實現的TCP網絡編程框架 英文翻譯
. BufferSizeOption改為ChannelSizeOption
. 定時器重構
TimedTask要帶上net id作為context，把這個接口封裝好

Annoucing Tao 1.6.0

1. Bugfix: writeLoop() drains all pending messages before exit;
   writeLoop()函數退出前將所有的網絡數據包發送完畢；
2. Renaming getter methods according to Effective Go;
   根據Effective Go重命名getter方法；
3. Bugfix: timer task expired forever due to system clock affected by NTP;
   修復因為受NTP協議校正系統時鐘偏差的影響，導致定時任務永遠過期的bug；
4. Bugfix: asyncWrite() do not return error if called after ServerConn or ClientConn closes;
   修復網絡連接關閉后調用asyncWrite()不返回錯誤的bug；
5. Providing WorkerSizeOption() for tuning the size of worker go-routine pool;
   提供WorkerSizeOption()來調節工作者線程池大小；
6. Providing BufferSizeOption() for tuning the size of buffered channel;
   提供BufferSizeOption()來調節緩沖通道大??；
7. Providing ReconnectOption() for activating ClientConn's reconnecting mechanism;
   提供ReconnectOption()來啟動ClientConn的斷線重連機制；
8. Providing CustomCodecOption() for setting self-defined codec;
   提供CustomCodecOption() 來設置自定義編解碼器；
9. Providing TLSCredsOption() for running a TLS server;
   提供TLSCredsOption()來運行TLS服務器；
10. Providing OnConnectOption(), OnMessageOption(), OnCloseOption() and OnErrorOption() for setting callbacks of the four situations respectively;
    提供OnConnectOption(), OnMessageOption(), OnCloseOption() 和 OnErrorOption()來設置四種情況下的回調函數；
11. Use the standard sync.Map instead of map guarded by rwmutex;
    使用標準庫中的sync.Map替換使用rwmutex保護的map；

Anncoucing Tao 1.5.0

1. A Golang-style redesigning of the overall framework, a reduce about 500+ lines of codes;
   按照Go語言風格重新設計的整體框架，精簡500多行代碼；
2. Providing new Server, ClientConn and ServerConn struct and a WriteCloser interface;
   提供Server，ClientConn和ServerConn三種新結構和WriteCloser新接口；
3. Using standard context package to manage and spread request-scoped data acrossing go-routines;
   使用標準庫中的context包在多個Go線程中管理和傳播與請求有關的數據；
4. Graceful stopping, all go-routines are related by context, and they will be noticed and exit when server stops or connection closes;
   優雅停機，所有的Go線程都通過上下文進行關聯，當服務器停機或連接關閉時它們都會收到通知并執行退出；
5. Providing new type HandlerFunc func(context.Context, WriteCloser) for defining message handlers;
   提供新的HandlerFunc類型來定義消息處理器；
6. Developers can now use NewContextWithMessage() and MessageFromContext() to put and get message they are about to use in handler function's context, this also leads to a more clarified design;
   開發者現在可以通過NewContextWithMessage()和MessageFromContext()函數來在上下文中存取他們將在處理器函數中使用的消息，這樣的設計更簡潔；
7. Go-routine functions readLoop(), writeLoop() and handleLoop() are all optimized to serve both ServerConn and ClientConn, serveral dead-lock bugs such as blocking on channels are fixed;
   優化Go線程函數readLoop()，writeLoop()和handleLoop()使得它們能同時為ServerConn和ClientConn服務，修復了多個“通道阻塞”的死鎖問題；
8. Reconnecting mechanism of ClientConn is redesigned and optimized;
   重新設計和優化ClientConn的斷線重連機制；

Announcing Tao 1.4.0

1. bugfix：TLS重連失敗問題；
   bugfix: failed to reconnect the TLS connection;
2. bugfix：ConnectionMap死鎖問題；
   bugfix: ConnectionMap dead-lock problem;
3. 優化TCP網絡連接的關閉過程；
   Optimize the closing process of TCP connection;
4. 優化服務器的關閉過程；
   Optimize the closing process of server;
5. 更優雅的消息處理注冊接口；
   More elegant message handler register interface;

Announcing Tao 1.3.0

1. bugfix：修復斷線重連狀態不一致問題；
   bugfix: fixed inconsistent status caused by reconnecting;
2. bugfix：修復ServerConnection和TimingWheel在連接關閉時并發訪問導致崩潰問題；
   bugfix: fixed a corruption caused by concurrent accessing between ServerConnection and TimingWheel during connection closing;
3. 無鎖且線程安全的TimingWheel，優化CPU占用率；
   Lock-free and thread-safe TimingWheel, optimized occupancy rate;
4. bugfix：修復TLS配置文件讀取函數；
   bugfix: Fixed errors when loading TLS config;
5. 添加消息相關的Context結構；簡化消息注冊機制，直接注冊處理函數到HandlerMap；
   A message-related Context struct added; Register handler functions in HandlerMap directly to simplify message registration mechanism;
6. 合并NewClientConnection()和NewTLSClientConnection()，提供一致的API；
   Combine NewTLSConnection() into NewClientConnection(), providing a consistent API;
7. 工作者線程池改造成單例模式；
   Make WorkerPool a singleton pattern;
8. 使用Holmes日志庫代替glog；
   Using Holmes logging package instead of glog;
9. 添加metrics.go：基于expvar標準包導出服務器關鍵信息；
   Add metrics.go: exporting critical server information based on expvar standard pacakge;

Announcing Tao 1.2.0

1. 更優雅的消息注冊接口；
   More elegant message register interface;
2. TCPConnection的斷線重連機制；
   TCPConnection reconnecting upon closing;
3. bugfix：協議未注冊時不關閉客戶端連接；
   bugfix: Don't close client when messages not registered;
4. bugfix：在readLoop()協程中處理心跳時間戳更新；
   bugfix: Updating heart-beat timestamp in readLoop() go-routine;
5. bugfix：Message接口使用Serialize()替代之前的MarshalBinary()，以免框架使用者使用gob.Encoder/Decoder的時候棧溢出；
   bugfix: Use Serialize() instead of MarshalBinary() in Message interface, preventing stack overflows when framework users use gob.Encoder/Decoder;
6. bugfix：當應用層數據長度大于0時才對其進行序列化；
   bugfix: Serialize application data when its length greater than 0;
7. 新API：SetCodec()，允許TCPConnection自定義編解碼器；
   New API: SetCodec() allowing TCPConnection defines its own codec;
8. 新API：SetDBInitializer()，允許框架使用者定義數據訪問接口；
   New API: SetDBInitializer() allowing framework users define data access interface;
9. 允許框架使用者在TCPConnection上設置自定義數據；
   Allowing framework users setting custom data on TCPConnection;
10. 為新客戶端連接的啟動單獨開辟一個對應的go協程；
    Allocating a corresponding go-routine for newly-connected clients respectively;
11. bugfix：寫事件循環在連接關閉時將信道中的數據全部發送出去；
    bugfix: writeLoop() flushes all packets left in channel when performing closing;
12. bugfix：服務器和客戶端連接等待所有go協程關閉后再退出；
    bugfix: Servers and client connections wait for the exits of all go-routines before shutting down;
13. 重構Server和Connection，采用針對接口編程的設計；
    Refactoring Server and Connection, adopting a programming-by-interface design;
14. 設置500毫秒讀超時，防止readLoop()發生阻塞；
    Setting 500ms read-timeout prevents readLoop() from blocking;

Annoucing Tao 1.1.0

1. 添加注釋，提高代碼可讀性
   Add comments, make it more readable;
2. 服務器的最大并發連接數（默認1000）
   Server max connections limit (default to 1000);
3. 新API：TCPServer：NewTLSTCPServer() 創建傳輸層安全的TCP服務器
   New API: NewTLSTCPServer() for creating TLS-supported TCP server;
4. 新特性：TCPServer：SetOnScheduleCallback() 由框架使用者來定義計劃任務（比如心跳）
   Make scheduled task managed by framwork users;
5. 新特性：支持默認的消息編解碼器TypeLengthValueCodec，并允許框架使用者開發自定義編解碼器
   Support TypeLengthValueCodec by default, allow framework users develop their own codecs;