观察者模式是相反的？ [英] What is the opposite of the observer pattern?

问题描述

据我了解，观察者模式允许多个观察者监视单个主题。是否有相反情况的模式？单个观察者是否有模式监视多个主题，并在任何一个观察者提出Notify事件时作出响应？

解决方案

p>仍然可以使用Observer模式：只有与许多监视对象的观察者具有相同的对象注册。您可能希望通知事件接收某种观察对象标识符（this指针，唯一的ID号等），以便观察者对象可以选择适合报告事件的对象的操作。 / p>

As I understand it, the observer pattern allows for multiple observers to monitor a single subject. Is there a pattern for the opposite scenario? Is there a pattern for a single observer that monitors several subjects and responds when any one of them raises, say, a Notify event?

解决方案

The Observer pattern can still be used: just have the same object register as an observer to many monitored objects. You'll probably want the "Notify" event to receive some kind of observed-object identifier (the "this" pointer, a unique id number etc) so that the observer object can choose an action appropriate to the object reporting the event.

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