Dependency Injection Explained Like You’re 5 (with FastAPI Examples) - YouTube
Learning dependency injection can be hard. In this simple FastAPI tutorial we will go over dependency injection and that Depends Keyword.💻 Repository: https...
Click
Use
to move to a smaller summary and to move to a larger one
Understanding Dependency Injection in Software Development
- Dependency injection is a design pattern where an object or function receives its dependencies from external sources instead of creating them internally.
- The main purpose of dependency injection is to promote loose coupling between components, making the system more modular, testable, and maintainable.
- Dependency injection helps in achieving inversion of control, where classes are not responsible for creating their dependencies but receive them automatically.
- Dependency injection is commonly found in Enterprise applications and is essential for creating scalable and maintainable software systems.
Challenges with Tight Coupling and Solution with Dependency Injection
- DTOs were created and tightly coupled in constructors, leading to a cycle of bug fixes creating more bugs.
- Changes required tracing back through all dependencies, creating new objects and passing them into constructors.
- Dependency injection was the solution to make the product more modular and reduce tight coupling.
- Showcased an example using Fast API to demonstrate dependency injection through the library itself.
- Implemented a logger class to illustrate the use of dependency injection in code.
- Showed how dependency injection allows for reusability by creating a dependency that returns a new object of a class, which can be injected into functions as needed.
- Emphasized the importance of using type annotations for cleaner code with dependency injection.
Explanation of Dependency Injection in Python.
- Import the logger from the Python um package of typing to simplify usage.
- Utilize dependency injection by adding a logger dependency that can be reused throughout the application.
- Implement dependency injection for an email service to avoid re-creating it in every function needing it.
- Demonstrate dependency injection for an authentication service to streamline the usage of the authentication service in different functions.
- Show how dependency injection simplifies the process by injecting dependencies as parameters.
Overview of Dependency Injection in Software Development
- Dependency injection is a design pattern promoting loose coupling between components.
- It aims to make systems more modular, testable, and maintainable.
- Inversion of control is achieved, where classes receive dependencies automatically.
- Commonly used in Enterprise applications for scalability and maintainability.
- Initially, DTOs were tightly coupled in constructors, leading to challenges in bug fixes.
- Dependency injection resolved tight coupling issues, making systems more modular.
- Demonstrated dependency injection through examples using Fast API and a logger class.