Using MVC with an observer pattern, if a user action requires polling a device (such as a camera) for data, should the polling be done in the Controller and the result passed off the Model or should a request be sent to the Model and the Model itself performs the polling.Using MVC with an observer pattern, if a user a
阅读背景：
使用MVC，与自治外设的交互是否属于模型或控制器？
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