extends injection @IN

[mireksz.m.szajowski.streamsoft.pl]

Hello,
I have

@In SpecialInterface object

SpecialInterface  - is not EJB or Seam bean. This is special kind of bean which I creates dynamicly. I need some way to tell seam
'If you don't have bean to inject ask me' some listener which is invoking when seam can't resolve dependency . For example

public Object resolveDependency(someInfoAboutFIeld){}

Best regards
Mirek

[robshep]

'If you don't have bean to inject ask me'

This is the factory pattern!

Provide a @Factory("object") method in another SEAM component which provides these types of objects.

You've also got @Unwrap if the manager pattern is a better fit for your bean

Good luck

Rob

[mireksz.m.szajowski.streamsoft.pl]

But @Factory has to have name of the bean. I need @Factory(SpecialInterface.class) or better @Factory(AbstractSpecialInterface.class)

[robshep]

No problem,

Seam components are those that are @Named and can contain @Factorys (for example) - but the beans that are in/out-jected by seam (context varialbles) don't necessarily need to be @Name d components, they can be any arbitrary type, you can even put a type like:

List<String> myNicknames

into a context as a context variable.

So,

1. Here, for example is your business Interface.

public interface SpecialInterface 
{
     public String somethingSpecial();
}

2. but these are made dynamically (depending on some other context variables maybe....) so let's make a @Factory in it's own SEAM component

@Name("specialInterfaceFactory")
public class FactoryTest 
{
     @Factory(autoCreate=true, value="mySpecialInterface")
     public SpecialInterface getSpecialInterface()
     {
          return new SpecialInterface(){

               @Override
               public String somethingSpecial() {
                    return "Seem Special?";
               }
          };
     }
}

3. Then when we want an instance of this Interface we can inject it, (here we use a different name than the member field)

@Name("specialInterfaceUser")
@Install(dependencies="specialInterfaceFactory")
public class SpecialInterfaceUser 
{
     @In("mySpecialInterface") SpecialInterface specialInterface;
     @Logger Log log;
     
     @Observer("org.jboss.seam.postInitialization")
     public void doSomething()
     {
          log.warn(specialInterface.somethingSpecial());
     }
}

Note, I just added the observer so I didn't need to write a view - and so also made sure the installation dependencies were OK (may be strictly be necessary in this case

Et voila:

15:45:29,483 INFO  [STDOUT] WARN  - SpecialInterfaceUser       - Seem Special?

Hope this helps

Rob

[robshep]

Minor typo: May not be strictly necessary in this case.