This article compares the publish-subscribe and observer patterns, two decoupled communication mechanisms. Publish-subscribe involves broadcasters sending messages to anonymous subscribers while observer involves a central observer notifying register
Publish-Subscribeis a decoupled communication mechanism where publishers broadcast messages to multiple subscribers without knowing their identities or number. Subscribers register to receive messages based on topics or events, and they are notified whenever a matching message is published.
Observeris also a decoupled communication mechanism, but it involves a central observer that maintains a list of observers (also called subjects). When the observed object (subject) changes, it notifies all observers, passing a reference to itself. Observers then update themselves based on the state of the subject.
The choice between publish-subscribe and observer patterns depends on the specific application requirements:
Publish-Subscribe
Pros:
Cons:
Observer
Pros:
Cons:
The above is the detailed content of The difference between publish-subscribe pattern and observer pattern. For more information, please follow other related articles on the PHP Chinese website!