nampython / temp

Create my own IoC / Dependency Container

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IoC Container

Have you ever wondered how Spring core famework works. I've always been curious how it works, so I created this project. It mainly used Java Rejection and support most annotations like @Service, @Autowire, @Bean, @PostConstructor…

Table of Contents

• General Information
• Prerequisites
• Installation
• Getting Started
• More info

General Information

//TODO

Prerequisites

• Dealing with class: https://www.tutorialspoint.com/java/lang/java_lang_class.htm
• Work with files: https://docs.oracle.com/javase/7/docs/api/java/io/File.html
• Java reflection (Method, Annotation, Constructor…): https://www.oracle.com/technical-resources/articles/java/javareflection.html
• Basic Spring Core framework and know several annotations like @Bean, @Service, @Postconstruct, @AfterDestroy, @Autowired…:https://www.baeldung.com/spring-core-annotations
• Design Pattern: Builder

Installation

You can run this project by 2 ways:

• The simple way is to run command: mvn clean install. Your dependency is in m2\repository\

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mvn clean install

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In the file pom of your project and add in tag

<dependency>
 <groupId>org.example</groupId>
 <artifactId>ioc</artifactId>
 <version>1.0</version>
</dependency>

• The other way is to run mvn package and get the generated jar file. Add this dependency in your project

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mvn package

---

<dependency>
 <groupId>org.example</groupId>
 <artifactId>ioc</artifactId>
 <version>1.0</version>
 <scope>system</scope>
 <systemPath>${basedir}/lib/yournamejar.jar</sysyemPath>
</dependency>

Getting Started

• In your main method call InitApp.run(YourStartupClass.class)
• Annotate your startup class with @Service
• Create a void method and annotate it with @StartUp

Here is a quick teaser of a complete project:

import org.example.annotations.Service;
import org.example.annotations.StartUp;
import org.example.container.DependencyContainer;
import org.example.container.DependencyContainerImpl;

@Service
public class Main
{
    private static final DependencyContainer dependencyContainer;
    static {
        dependencyContainer = new DependencyContainerImpl();
    }

    public static void main( String[] args ) {
        InitApp.run(Main.class);
    }

    @StartUp
    public void startUpMethod() {
        //coding here to get all the information about service classes from dependencyContainer variable
    }
}

Supported annotations by default:

• Bean - Specify bean producing method.
• Service - Specify service.
• Autowired - Specify which constructor will be used to create instance of a service, also you can annotate fields with this annotation.
• PostConstruct - Specify a method that will be executed after the service has been created.
• PreDestroy - Specify a method that will be executed just before the service has been disposed.
• StartUp - Specify the startup method for the app.

More info

If you are having trouble running the app, contact me at [e-mail]