Dependency Inversion Principle by Mosh Hamedani

Ist part of DIP
High Level Module ==> Interface/Contract/Abstraction ==> Low Level Module/Details
HLM should not depend upon LLM, both should depend upon abstraction
There should exist an interface between HLM/Layers and LLM/Layers
These Interfaces are defined inside the HLM layer.
If the Contract remain the same, High level module will be not effected.
If the Contract is simple and clean and thoughtful, predictive, chances are it will not change

2nd part of DIP
High Level Module ==> Interface/Contract/Abstraction <== Low Level Module/Details
Abstractions should not depend upon details, Details should depend upon Abstractions
Interface should be pure and generic, they should not have to leaky
Interface should be defined interms of only Interfaces.
Interface Methods should not use the Types with in LLM
All these interfaces are defined inside the HLM
If layers. LLM layer include the reference of HLM layer.
Arrows show the Dependency Flow not the Control Flow a runtime.