It is lightweight, can be used in Android applications, is implemented via a concise DSL, and takes advantage of Kotlin features like delegate properties rather than relying on annotations. Koin is a dependency injection framework for Kotlin.

The framework's code then calls your code at these points.ĭependency injection (DI) is one specific example of IoC where classes no longer directly instantiate member properties by creating new objects but instead declare their dependencies and allow an external system, in this case, a dependency injection framework to satisfy those dependencies. In order to use it, you need to insert your behavior into various places in the framework, either by subclassing or by plugging in your own classes. Each call does some work and returns control to the client.Ī framework embodies some abstract design, with more behavior built-in. A library is essentially a set of functions that you can call, these days usually organized into classes. Inversion of Control is a key part of what makes a framework different from a library.

Martin Fowler describes a framework in terms of IoC: Inversion of Control (IoC) is a broad term to describe how responsibility for some aspect of a system is lifted out of the custom code written by the end developer and into a framework.

Kotlin for each