understanding-dagger

helloWorld

Minimalistic example without modules.

The code in DaggerGarage.java is like handwritten code.

@Override
  public Car car() {
    return new Car(new Engine());}

bindsProvides

• Module - set of dependencies

• Enables tests

• Binds is done in compile time (Garage.java)

• Provides is injected in runtime (TestGarage.java)

• provider - jsr-330

scopes

• SessionScope - SessionData and SessionManager is in same scope so constructor works
• DBClient is in different scope so we can inject
• DoublecheckProvider ensures that ut is same object
• Singleton is just a scope

bindsInto

• Communicate with external framework through factories
• bindsinto

lazy

• Object gets created on get call
• Demonstrate inject