Readme.md

Java Dependency Injection

Overview

This Java project introduces a small but robust Dependency Injection (DI) mechanism, designed to facilitate object management and dependency resolution in Java applications. This DI framework offers a simple yet powerful approach to manage class dependencies, object creation, and lifecycle, enhancing modularity and testability in your Java projects.

Features

• Lazy Loading: Objects are created on-demand, optimizing resource usage.
• Class Mapping: Easily map interfaces or abstract classes to concrete implementations.
• Factory Support: Integrate complex object creation logic with custom factories.
• Field Injection: Automate the injection of dependencies into your classes.
• Custom Object Creation: Control instance creation with custom logic.

Getting Started

Prerequisites

• Java Development Kit (JDK)
• An IDE supporting Java (e.g., IntelliJ IDEA, Eclipse).

Installation

1. Clone the repository:

   git clone [repository URL]
   

2. Import the project into your IDE.

Basic Usage

1. Object Retrieval:

   MyClass myObject = ObjectManager.get(MyClass.class);

2. Class Mapping:

   ObjectManager.set(MyInterface.class, MyImplementation.class);

3. Class Mapping:

   ObjectManager.set(MyInterface.class, new MyClass());

4. Object Creation with Arguments:

   MyClass myObject = ObjectManager.create(MyClass.class, arg1, arg2);

5. Using Factories:

   ObjectManager.setFactory(MyClass.class, new MyFactory());

Example

Here's a simple example to demonstrate the usage of the DI mechanism:

1. Define an interface and its implementation:

   public interface Logger {
       void log(String message);
   }
   
   public class ConsoleLogger implements Logger {
       @Override
       public void log(String message) {
           System.out.println(message);
       }
   }

2. Configure the DI system:

   ObjectManager.set(Logger.class, ConsoleLogger.class);

3. Use the interface in your application:

   public class MyApp {
       @Inject
       private Logger logger;
   
       public void run() {
           logger.log("Application is running");
       }
   }

4. Retrieve and use the MyApp instance:

   MyApp app = ObjectManager.get(MyApp.class);
   app.run();

You can find another working example in src/app/Main.java and in the model-package.

License

This project is licensed under the MIT License.