An active object that is responsible for an asynchronous request to the Message Server.
An active object that is responsible for an asynchronous request to the Message Server.
操作对象：某个激活的对象，负责对消息服务器的同步请求做响应。
An active object that is responsible for an asynchronous request to the Message Server.
操作对象：某个激活的对象，负责对消息服务器的同步请求做响应。