Discussion
Which design pattern is most suitable for decoupling components in an event-driven architecture ?
Answer: C
The pattern is Observer.
In the observer (publish-subscribe) pattern, a subject keeps a list of observers and notifies them when an event occurs, without knowing what they are or what they do. Components can be added or removed by subscribing or unsubscribing, which decouples event producers from consumers, the core of event-driven design.
Singleton ensures a class has one instance, factory centralises object creation, and adapter converts one interface into another. None of them is about delivering events between independent components.
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