Dependency Inversion

Summary

• For Flow of Control Dependencies, inject dependencies as interfaces, or abstractions.
• Ensure the abstractions, or interfaces, are defined in a higher level module and implemented in a lower level module to ensure the Source Code Dependency is Inverted.

Details

• Flow of Control Dependency — when you are debugging code and the line of execution goes from one project into another project or dll.
• Source Code Dependency — where one project references another project or dll.
• We invert a Source Code Dependency when we identify that the rate of change of a project is more than the project that depends on it.
• an Abstraction is an interface and a Detail is an implementation.

Conclusion

• For Flow of Control Dependencies, inject dependencies as interfaces, or abstractions.
• Ensure the abstractions, or interfaces, are defined in a higher level module and implemented in a lower level module to ensure the Source Code Dependency is Inverted.

Resources

• 1: https://medium.com/codex/the-difference-between-dependency-inversion-and-dependency-injection-15935337ca1b

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Backlinks

• From 3 Layered to Ddd Architecture in One Step