koin: What is koin - devrath/DroidDi GitHub Wiki

Features of koin

• It involves runtime code generation.
• It uses a service locator design pattern.
• It is built for kotlin.
• It is written in kotlin fully.

How koin operates under the hood

Modules

• Dependencies are defined in modules by grouping related instances.
• Modules are created using the module function.

Dependencies

• The dependencies are created in 3 ways - This refers to the desired lifecycle behavior.
  • Single
  • Factory
  • Scoped
• Single ----> This creates a single instance of the desired dependency that is reused through the application lifecycle.
• Factory ---> This creates a new instance of the object every time we request it.
• Scoped ----> This creates a specific instance under a specific scope, It can be per activity, fragment, etc.

Injection

• Dependencies are injected into the class using by inject() delegate that allows us to access the dependencies without instantiating them.

KoinContainer

• Koin container holds all the modules in a container and provides the required dependencies as needed.