Showing posts with label Behavioral Design Patterns. Show all posts

Saturday, 24 August 2013

Behavioral design patterns

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What are Behavioral Design Patterns?

In software engineering, organizing how objects talk to each other without creating tightly coupled dependencies is one of the most critical aspects of robust application design. Behavioral Design Patterns focus specifically on communication, interaction, and the assignment of responsibilities between objects.

Core Definitions & Concepts

Identify Common Communication Patterns: In software engineering, behavioral design patterns identify common communication patterns between objects and realize these patterns to increase flexibility in carrying out this communication.
Interaction with Loose Coupling: Behavioral patterns are concerned with the interaction between objects. Objects should communicate smoothly while remaining loosely coupled—loose coupling is the key principle to scalable, clean software architecture.
Distributing Steps and Responsibilities: A behavioral pattern explains how objects interact by describing how different classes send messages to one another to accomplish tasks and how steps of an operation are divided across collaborating objects.

The Complete Behavioral Patterns Checklist

Here are the core behavioral patterns utilized across object-oriented programming and enterprise Java development:

Chain of Responsibility Pattern: Passes a request along a dynamic chain of potential handlers until one handles it.
Command Pattern: Encapsulates a request as an object, enabling parameterization of clients with queues, logs, and undoable operations.
Interpreter Pattern: Defines a grammatical representation for a language along with an interpreter to evaluate sentences.
Iterator Pattern: Provides a way to access elements of an aggregate object sequentially without exposing its underlying representation.
Mediator Pattern: Defines an object that encapsulates how a set of objects interact, preventing tight direct dependencies.
Memento Pattern: Captures and externalizes an object's internal state so it can be restored later without violating encapsulation.
Observer Pattern (Publisher-Subscriber): Defines a one-to-many dependency so that when one object changes state, all its dependents are notified automatically.
State Pattern: Allows an object to alter its behavior when its internal state changes, appearing as if it changed its class.
Strategy Pattern: Defines a family of algorithms, encapsulates each one, and makes them interchangeable at runtime.
Template Method Pattern: Defines the skeleton of an algorithm in a method, deferring specific steps to subclasses.
Visitor Pattern: Represents an operation to be performed on elements of an object structure without changing the classes on which it operates.
Null Object Pattern: Provides a predictable surrogate default object instead of returning null references.

Why Master Behavioral Patterns?

Promotes Loose Coupling: Allows objects to collaborate without needing deep knowledge of each other's concrete implementations.
Boosts Maintainability & Extensibility: Simplifies adding new communication behaviors without altering existing business logic.
Powers Modern Frameworks: Forms the foundation of event handling, reactive streams, Spring frameworks, and GUI architectures.