異步服務器設計框架 AMPS

AMPS一個中間件，它提供了一個框架，用于構建任何一個事件驅動的，異步處理的應用。與傳統的基于線程的實現，AMPS允許單線程的方法，執行高并發應用程序。

AMPS is a middleware that provides a framework to write any software application as an event driven, asynchronous process . Unlike conventional thread based implementations, AMPS allows highly concurrent applications to run as a single thread of execution. 

AMPS實現要求，應用被設計成有限狀態機的模型，狀態的改變是基于事件的，每個狀態的改變都要求有事件處理程序。一旦這樣的設想，實現能提供多重好處。

AMPS implementations require that the application be modelled as a FSM (Finite State Machine) that changes state based on ‘events’. ‘Event handlers’ are written for each state change. Once envisioned in this way, implementations provide multiple benefits. 

本編程模型的好處有：

• 所有的執行都是不需要鎖的。沒有鎖，沒有互斥，不需要請求信號。
• 所有事件處理程序都是確定的。
• 自然支持對稱多處理，非對稱多處理和多核心系統。
• 程序是云就緒的.
• 沒有線程間上下文切換或者等待鎖的系統開銷。
• 代碼是在線程所產生的耦合效應應用的深入細微的錯誤自由。
• 代碼避免了基于線程的應用由于深度耦合而產生的bug.

Some of the benefits of this programming model are:

• All execution is lock free. No locks, no mutexes, no semaphores required ever.
• All event handlers are deterministic
• Natural support for Symmetric multi-processing, Asymmetric multi processing and multi-core systems.
• Applications are cloud ready
• No system overhead in context switching between threads or waiting for locks.
• Code is free of subtle bugs arising out of deep coupling effects in thread based applications.

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