Join Jungwoo Ryoo for an in-depth discussion in this video Chain of responsibility, part of Python: Design Patterns.
- Chain of Responsibility opens up various possibilities of processing for a given request. The Chain of Responsibility pattern decouples the request and its processing. Our given problem is that many different types of processing needs to be done depending on what the request is. In our scenario, we receive an integer value and then we use different handlers to find out its range. As our solution, we used Abstract Handler that stores a Successor who will handle a request if it is not handled at the current handler.
then Concrete Handlers check if they can handle the request. If they can, they handle it and return a true value indicating that the request was handled. Composite is related to the Chain of Responsibility design pattern.
- Understanding design patterns
- Best design practices: consistency, completeness, and correctness
- Working with creational patterns
- Working with structural patterns
- Working with behavioral patterns
Skill Level Intermediate
Q: In the strategy pattern example, why does the code keep executing the default function rather than the alternate?
A: The programming demonstration skips the step of defining what the strategy pattern should be when an alternate function name is provided
as an argument as shown below.
Programming Foundations: Design Patternswith Elisabeth Robson2h 19m Intermediate
1. Understanding Design Patterns
2. Creational Patterns
3. Structural Patterns
4. Behavioral Patterns
5. Design Best Practices
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