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(Yaf >=1.0.0)
Yaf_Dispatcher用于初始化处理请求的运行环境, 它协调路由来的请求, 并分发和执行发现的动作, 然后收集动作产生的响应, 输出响应给请求者, 并在整个过程完成以后返回响应.
Yaf_Dispatcher是单例模式运行的, 也就是说自始至终只生成一个Yaf_Dispatcher实例, 因此, 可以把它看成是在分发过程中生成的对象的注册表, 可以从中获取到分发过程中产生的对象.