Dagger ‐ multi binding

• Normally in most scenarios we handle a single instance of objects but there are a bunch of scenarios where you might need to group a bunch of instances into a collection and get it injected. In such scenarios multibinding comes into play.
• Consider you have the collections of shapes.

interface Shape
class Triangle : Shape
class Rectangle : Shape
class Circle : Shape

• You can inject all the shapes in one set using dagger multi-bindings.
• You can use multi-bindings to implement a plugin architecture, where several modules can contribute to individual plugin interface implementations so the central class can use the entire set of plugins.
• This plugin-architecture adheres to the open-closed principle meaning it is open for extension and closed for modification.