Observer design pattern

Devrath edited this page Dec 2, 2023 · 7 revisions

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When to use this pattern

Assume there is a data source that we can call an observable and there are many clients who are observers listening for the change in the data of the observable. When there is a change in observable` all the observers are notified.
Now we need The data source to talk to all the observers without being tightly coupled.
We can use an interface called observer and make data source to talk to the interface.
This preserves the open-closed principle meaning a functionality is open for extension and closed for modification.
There is a push and pull style approach. We are using the pull style approach in our case since it the best approach.

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