There is an asynchronous callback model and an asynchronous polling model.
其中包含异步回调模型和异步轮询模型。
This paper brings up a solution of multi-thread asynchronous polling in EJB container.
设计中我们提出了在EJB容器内实现异步多线程轮询的解决方案。
Long Polling: Also known as Asynchronous Polling, this method is a hybrid of pure server push and client pull.
长时间轮询：也就是所谓的异步轮询，这种方式是纯服务器端推送方式和客户端拉取方式的混合。
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