该协议根据各节点内实时队列长度动态的控制轮询过程，每个轮询周期对具有最长队列的节点进行服务。
This protocol adaptively controls the polling process according to the real-time queue length of each stations and serves the one with the longest queue firstly in each polling cycle.
客户机根据预定的时间间隔(轮询间隔)依次发送另一个请求，继续这个过程，直至服务器中有一个更新。
The client in turn sends another request after a predetermined interval (poll interval) and this process continues until there is an update from the server.
藉由这个新的接口，开发人员可以实现service异步调用过程中的细粒度通知，但它并没有提供Callback类中的轮询机制。
This new interface allows for finer grained notifications during the asynchronous invocation of a service, but it does not provide the polling mechanism formerly found in the Callback class.
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