Dependency Injection

Implementation of dependency injection in java.

Install

This package didn't upload to the maven central repository. Thus, for using this dependency you can use Jitpack.io.

1. Add the Jitpack repository to pom.xml

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

2. Add the di dependency to pom.xml

<dependency>
    <groupId>com.github.serveriev</groupId>
    <artifactId>dependency-injection</artifactId>
    <version>v1.0</version>
</dependency>

How to use

1. Configure your instances.

You should create a Java file for initializing your instances(aka beans configuration in spring).

import io.lenur.di.annotation.Dependencies;
import io.lenur.di.annotation.Instance;

@Dependencies
public class Instances {
    @Instance
    public AnswerDao getAnswerDai() {
        return new AnswerDao();
    }

    @Instance
    public QuestionDao getQuestionDao() {
        return new QuestionDao();
    }
}

2. Inject instances.

import io.lenur.di.annotation.Inject;

public class AnswerController {
    @Inject
    private AnswerDao answerDao;

    public boolean add(Answer answer) {
        return answerDao.add(answer);
    }

    public List<Answer> getAll() {
        return answerDao.getAll();
    }
}

3. Init dependencies scan and get your instances

import io.lenur.di.Dependency;
import io.lenur.di.PackageContext;

public class Application {
    public static void main(String[] args) {
        PackageContext context = Dependency.init("io.example");
        AnswerController answerController = (AnswerController) context.getInstance(AnswerController.class);
        QuestionController questionController = (QuestionController) context.getInstance(QuestionController.class);
    }
}

Example

See a demo project for details

Author

Lenur

Github: @serveriev

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License

This project is MIT licensed.