Composition and Seam-Components

[chrisb76]

Hey there,

as I am beeing new here, I would like to say 'Hello' :-)

I am just wondering how I can implement a Composition using Seam-Components.

For instance:

Interface I {
void doSomething();
}

@Name("a")
Class A implements I { 
   @In
   Object a;
   public void doSomething() {
       sysout(a.toString());
   }
}

@Name("b")
Class B implements I {
   @In
   Object b;
   public void doSomething() {
       sysout(b.toString);
   }
}

@Name("seamComponent")
class seamComponent {

@In ???
I composition;

public setComposition(I aCompositonObject) {
   composition  = aCompositonObject;
}

public go() {
  composition.doSomething()
}

}

What I want to do?
I want to change the 'composition'-Object in the class 'seamComponent' dynamic.
As I need in 'A' and 'B' some objects out of the Seam-Scope they have to be Seam-Components.
And so they do have different?! names. How can i switch the Seam-Components in the class 'seamComponent'?

I hope you get what I mean, my english isn't that good :-)

Regards,

Christian

[cash1981]

Hello Christian. Welcome to the forum.

I do not fully understand what you want. However I have some comments on the above code. First of all, it seems you have injecting

@In Object a; in class A with name a. Are you sure this is correct?  I believe you want to inject b into a and inject a into b? Like this:

@Name("b")
Class B implements I {
   @In(create = true)
   A a;
   public void doSomething() {
       sysout(b.toString);
   }
}

If you want to use A and B class in your component Something, you can just inject them

@Name("seamComponent")
class seamComponent {
   @In(create = true) A a;
   @In(create = true) B b;
 I composition;
   public setComposition(I aCompositonObject) {
   composition = aCompositonObject;
 }
   public go() {
  composition.doSomething()
 }

}

I am not sure what the I composition is here. Try reading the documentation on seam to fully understand the bi-jection.

[chrisb76]

Hey Shervin,

thx for the quick reply!

Shervin Asgari wrote on Sep 11, 2009 14:22:



@In Object a; in class A with name a. Are you sure this is correct?  I believe you want to inject b into a and inject a into b? Like this:

@Name("b")
Class B implements I {
   @In(create = true)
   A a;
   public void doSomething() {
       sysout(b.toString);
   }
}

If you want to use A and B class in your component Something, you can just inject them

@Name("seamComponent")
class seamComponent {
   @In(create = true) A a;
   @In(create = true) B b;
 I composition;
   public setComposition(I aCompositonObject) {
   composition = aCompositonObject;
 }
   public go() {
  composition.doSomething()
 }

}

I am not sure what the I composition is here. Try reading the documentation on seam to fully understand the bi-jection.

The Objects in Class A and Class B really dont matters.
I just wanted to show some different BusinessLogic...

I don't want to inject both classes and any further implementation of the interface. It is more inject class A OR class B (or Class C...). Any of the developers can implement the interface if the functions provided in the standard-implementation doesnt fit. Is there a way to do this in seam without coding in the class 'seamComponent' ?
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[trunikov.dmitry.trunikov.zoral.com.ua]

Hi Christian,

I perceive your issue. May be you should take a look on @Factory annotation.