RP 定义了通道对象（Channel object）来维护中间件和读写器之间的通信，有两种通道对象： CommandChannels 和 NotificationChannels，前者负责从中间件那里接收指令，...
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object channel 物体通道
The event-dispatching servlet instantiates the event channel object and three sample event receivers.
事件分派servlet实例化事件通道对象和三个示例事件接收者。
The event receivers are then subscribed to given events, which the servlet publishes to the event channel object.
事件接收者然后订阅给定的事件，servlet将事件发布给事件通道对象。
Gets a value that indicates whether the number of properties that can be entered into the channel object is fixed.
获取一个值，该值指示可以输入到信道对象中的属性的数目是否是固定的。
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