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Behavioral Patterns
Introduction
Chain of Responsibility Pattern
Command Pattern
Iterator Pattern
Mediator Pattern
Memento Pattern
Observer Pattern
State Pattern
Strategy Pattern
Template Method Pattern
Visitor Pattern
Summary
Summary
For quick reference, the following table offers a thorough analysis of the distinctive characteristics, applicability, examples, benefits, and drawbacks of each structural design pattern.
| Pattern Name | Distinctive Feature | Applicability | An Example | Pros | Cons |
|---|---|---|---|---|---|
| Adapter | Bridges incompatibilities between interfaces | When you want to use an existing class whose interface is not compatible with the rest of the code | Power adapter for different plug types | Enables interoperability of interfaces; reusable | Increases overall complexity of the code |
| Composite | Represents part-whole hierarchies of objects | When you want to treat individual objects and compositions of objects uniformly | Graphic drawing editor handling shapes and groups of shapes | Simplifies client code; easier management of objects | Design can become overly generalized |
| Proxy | Provides a placeholder for another object to control access to it | Lazy loading, logging, access control, smart reference | Internet proxy server controlling access to web content | Control object access; reduce cost of expensive operations | Can introduce a level of indirection; may impact performance |
| Flyweight | Minimizes memory usage by sharing as much data as possible with similar objects | When dealing with large numbers of similar objects with little variation in state | Characters in a word processor | Reduces memory usage; efficient data sharing | Complexity; managing shared state |
| Bridge | Separates an object’s abstraction from its implementation | When you want to avoid a permanent binding between an abstraction and its implementation | Different UI platforms with different backend renderers | Abstraction and implementation can vary independently; scalability | Increased complexity; conceptual overhead |
| Decorator | Adds responsibilities to objects dynamically | When extending capabilities of a class in runtime | Adding scrolling to a text view dynamically | More flexible than subclassing; avoid feature-loaded classes | Can lead to complex code structure; hard to debug |
| Facade | Provides a simplified interface to a complex subsystem | When there's a complex system and you want to provide a simple interface to it | Home theater control system | Simplifies interface; reduces dependencies on outside code | Can become a single point of failure; may limit flexibility |
Proxy Pattern
Introduction
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