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@Produces return FacesContext --- why?

I hesitate to ask yet another question on the same topic, but at least now I'm reading, I think, the right docs.

So, this class:

class FacesContextProducer {
   @Produces @RequestScoped FacesContext getFacesContext() {
      return FacesContext.getCurrentInstance();
   }
}

From the weld docs this method does, in fact, apply to Glassfish through: GlassFish is using WELD as the reference implementation for JSR-299: Java Contexts and Dependency Injection for the Java EE platform (CDI).

For the above class, where would it be used? Why do you need a separate class which @Produces a FacesContext?

Solution

  • For the above class, where would it be used? Why is he trying to inject FacesContext?

    I think it is done either for

    1. consistency; or
    2. testing.

    ad 1. If one tries to do pure CDI, it looks nice when you're not using other dependency lookup mechanisms (as getCurrentInstace() static method). Note that it is really not needed to define a producer and use injection. It is just convenient and consistent with usage of CDI.

    ad 2. is explained by blog McDowell links to, just imagine the injection is done with CDI.

    Why do you need a separate class which @Produces a FacesContext?

    This does not need to be a separate class, you can have single class producing multiple beans. It just helps the clarity of the code to have it separate.