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Dependency Inversion Principle

4. Interface Segregation Principle

The Dependency Inversion Principle (DIP) is a principle in object-oriented design that states that “High-level modules should not depend on low-level modules. Both should depend on abstractions“. Additionally, abstractions should not depend on details. Details should depend on abstractions.

  • In simpler terms, the DIP suggests that classes should rely on abstractions (e.g., interfaces or abstract classes) rather than concrete implementations.
  • This allows for more flexible and decoupled code, making it easier to change implementations without affecting other parts of the codebase.

Let’s understand Dependency Inversion Principle using an example:

In a software development team, developers depend on an abstract version control system (e.g., Git) to manage and track changes to the codebase. They don’t depend on specific details of how Git works internally.

This allows developers to focus on writing code without needing to understand the intricacies of version control implementation.


SOLID Principles in Programming: Understand With Real Life Examples

In software development, Object-Oriented Design plays a crucial role when it comes to writing flexible, scalable, maintainable, and reusable code. There are so many benefits of using OOD but every developer should also know the SOLID principle for good object-oriented design in programming. The SOLID principle was introduced by Robert C. Martin, also known as Uncle Bob and it is a coding standard in programming. This principle is an acronym of the five principles which are given below:

  • Single Responsibility Principle (SRP)
  • Open/Closed Principle
  • Liskov’s Substitution Principle (LSP)
  • Interface Segregation Principle (ISP)
  • Dependency Inversion Principle (DIP)

The SOLID principle helps in reducing tight coupling. Tight coupling means a group of classes are highly dependent on one another which you should avoid in your code.

  • Opposite of tight coupling is loose coupling and your code is considered as a good code when it has loosely-coupled classes.
  • Loosely coupled classes minimize changes in your code, helps in making code more reusable, maintainable, flexible and stable. Now let’s discuss one by one these principles…

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1. Single Responsibility Principle

This principle states that “A class should have only one reason to change” which means every class should have a single responsibility or single job or single purpose. In other words, a class should have only one job or purpose within the software system....

2. Open/Closed Principle

This principle states that “Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification” which means you should be able to extend a class behavior, without modifying it....

3. Liskov’s Substitution Principle

The principle was introduced by Barbara Liskov in 1987 and according to this principle “Derived or child classes must be substitutable for their base or parent classes“. This principle ensures that any class that is the child of a parent class should be usable in place of its parent without any unexpected behavior....

4. Interface Segregation Principle

This principle is the first principle that applies to Interfaces instead of classes in SOLID and it is similar to the single responsibility principle. It states that “do not force any client to implement an interface which is irrelevant to them“. Here your main goal is to focus on avoiding fat interface and give preference to many small client-specific interfaces. You should prefer many client interfaces rather than one general interface and each interface should have a specific responsibility....

5. Dependency Inversion Principle

The Dependency Inversion Principle (DIP) is a principle in object-oriented design that states that “High-level modules should not depend on low-level modules. Both should depend on abstractions“. Additionally, abstractions should not depend on details. Details should depend on abstractions....

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#Design Pattern #GBlog #System Design

4. Interface Segregation Principle