Add component annotation and use it in injector class

[RomanChygryn]

No description provided.

[mateacademy-ai-mentor]

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Thank you for your hard work on this pull request! 😊 There are a couple of critical issues that need to be addressed before we can approve it:

1. Circular Dependency Handling: The current implementation of the getInstance method can lead to a stack overflow if there are circular dependencies. It's important to add a mechanism to detect and handle these circular dependencies to prevent runtime errors.

2. Instance Creation Logic: In the Injector class, the logic for creating instances is flawed. The clazzImplementationInstance is being reassigned within a loop for each field annotated with @Inject, which results in multiple instances being created for the same class. This should be corrected by moving the instantiation outside the loop to ensure that each class is instantiated only once.

Once these issues are resolved, your code will be much more robust and ready for approval. Keep up the great work, and don't hesitate to reach out if you have any questions or need further guidance! 🚀

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🔄 Fix the issues, commit the changes, and then re-request my review using the Re-request review button in the Reviewers tab.

[mateacademy-ai-mentor]

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Review Summary

Great job on implementing the dependency injection framework! 🎉 Your code meets most of the task requirements and constraints, and you've done well with the use of annotations and handling dependencies. However, there are a few critical issues that need to be addressed to ensure the correct functioning of your code:

1. Annotations Target: Remember to add @Target to your custom annotations. Both Inject and Component annotations are missing this, which is necessary to define where these annotations can be applied.

2. Interface Implementations Map: The map for interface implementations should be a class-level field in the Injector class, initialized using Map.of(). Currently, it's created within the findImplementation method, which is not optimal.

3. Instance Caching: Implement an instance caching mechanism in the Injector class. Currently, it creates a new instance every time getInstance is called, which can be inefficient. Check the instances map before creating a new instance to reuse existing ones.

4. Circular Dependencies: Be cautious of potential stack overflow issues due to recursive calls in getInstance when circular dependencies exist. Implement a mechanism to detect and handle such cases.

5. Instance Creation Efficiency: The clazzImplementationInstance is being created inside the loop for each field annotated with @Inject. This can lead to inefficiencies if a class has multiple such fields. Move the instance creation outside the loop to avoid unnecessary recreations.

These issues should be addressed to enhance the functionality and efficiency of your code. Keep up the good work, and use this feedback to improve your code further. Remember, addressing these points will help you avoid similar issues in the future and strengthen your understanding of dependency injection. Keep learning and coding! 🚀

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