Context and Dependency Injection (CDI) Advanced (Java EE 6)

Topics

  • Producer 
  • Events 
  • Alternatives 
  • Interceptor 
  • Decorator 
  • Stereotype T

Producer

Producer Method (@Produces)

  • Producer methods allow control over the production of the dependency objects 
    • Runtime polymorphism – Producer can return different object depending on runtime condition (business logic, time of the day, etc) 
    • Creation of Non-bean instance - Objects to be injected are not required to be instances of beans 
    • Custom setup - Objects require some custom initialization that is not performed by the bean constructor 
  • Enables decoupling of a “producer” from the “consumer” (of dependency objects) 
  • Enables type-safe programming model for injecting Java EE resources

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