What is the Chain of Responsibility design pattern and when should we use it?

The Chain of Responsibility is a behavioral design pattern that allows a request to be passed through a chain of handlers until at least one of them handles the request. Each handler in the chain can either handle the request or pass it on to the next handler.

So, what are the advantages of this pattern?

1- Reduced Coupling
There are no direct dependencies between the links in the chain. Thanks to the shared interface, the concrete handler just needs a reference to its successor, and it can then forward requests without knowing exactly the target class.

2- Flexibility
For the same reason, we also have added flexibility. We can add and shuffle the order of the concrete handlers at run-time without having to refactor them.
The main disadvantage is that we have no guarantee that the request is handled.

I will be using Java when describing a pattern because it is one of the most well suited for object-oriented programming. However, you can apply these patterns to most programming languages such as Python, JavaScript, Go, and many more.

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#java #designpatterns #softwaredevelopment

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