Observer Pattern

基本解釋

Figure 1 illustrates how the Observer pattern works.
圖 1 顯示了觀察者模式的機(jī)制。
Thus, at a high level, the Observer pattern provides a simple asynchronous model.
因此，從一個較高的層次上，觀察者模式提供了一種簡單的異步模型。
The Observer pattern is associated with a single source of events, however, whereas the Reactor pattern is associated with multiple sources of events.
不過，觀察者模式與單個事件源關(guān)聯(lián)，而反應(yīng)器模式則與多個事件源關(guān)聯(lián)。

One digital media observer noted in a recent blog post that he saw a similar pattern of discounting and giveaways right before HP killed off its tablet business.
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Therefore, the observer is resigned to wading through cryptic propaganda and often inconsequential government appointments, hoping to find some pattern that would indicate who the current favorite is.
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