SEDA_framework

Author : Lei Shi

---

Introduction:

This is C++ implement of SEDA framework. EveryOne can use our programming framework to implement a high concurrency system easily.

A http server is a example for the use of SEDA framework. It may give you help. the SEDA can be found at : The Staged Event-Driven Architecture for Highly-Concurrent Server Applications

• The advantages of SEDA:

  • The SEDA makes the deployment of architecture easier. developors will only focus on the logical function of your own system.

  • The SEDA makes full use of system resources with flexible thread control.

• The disadvantages:

  • NULL

---

Our architecture and technology implement:

• Stage :

                                    
                   ---------------------------------------------
                   |                                           |
   ------------    |  |---------------|      |---------------| |    
   |    MSG   |------->    receiver   ------>| stage-handler | |
   ------------    |  |---------------|      |---------------| |  
                   |          ^                      ^         |
                   |          |                      |         |
                   |          |                      |         |
                   |  |---------------|      |---------------| |    -------
                   |  | stage-control |<---->|  worker-pool  ------>| MSG |
                   |  |---------------|      |---------------| |    -------
                   ---------------------------------------------
                   

• Each function of module

  • receiver:

    • The receiver is a subsriber of message-queue.
    • Receive msq from other stage and forwarding to the stage-handler.
    • The receive is implemented by ZeroMQ.

  • stage-handler:

    • The logic of handling massages and the producer of message-queue, the excute units are in worker-pool.

  • worker-pool:

    • A worker-pool which can be implement as thread-based or processor-based worker-pool.
    • The thread-based worker-pool is implemented by mutex-based and no-mutex-based.
    • The difference between different types of worker-pool should be done during the following days.

  • stage-control:

    • Collecting infomation from receiver and worker-pool, then dynamicly adjusting the queue-num and worker-num.
    • But Using which method to adjust the load is still under thinking.

---