[jboss-user] [JBoss Seam] - Re: @Unwrap question

[mnrz]

Hi all
I have a question about @Unwrap.  
I tried @Unwrap in a test application and as I understood, the whole bean will 
play on behalf of the wrapped context variable. 
for instance if I have method


  | @name("bean")
  | class MyBean {
  | 
  |  @Unwrap
  |  public User getUser(){
  | 
  |  }
  | }
  | 

the "bean" is referring to an instance of type User, isn't it?

but the thing I want to know is if the values inside a page is changed by the  
user and press submit button, Are these new changes visible at the server side? 
for example, the user changes his address which is a property of class User, 
will this change being applied at context variable inside the MyBean?

thanks


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[jboss-user] [JBoss Seam] - Re: @Unwrap question

[marius.oancea]

As I know, @Unwrap annotate methoid is called everytime you access customerList 
variable. @Factory annotated method gets called only one time (if variable is 
not yet initialised)

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[jboss-user] [JBoss Seam] - Re: @Unwrap question

[enzhao]

Thanks to you all! :-)


Regards,
Ellen

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[jboss-user] [JBoss Seam] - Re: @Unwrap question

[[EMAIL PROTECTED]]

@Factory is useful to populate a context variable that is unchanging, or the 
change originates within your context. within it's scope (for example a list of 
hotels available to book).  @Unwrap is useful if the variable can change 
outside your control (e.g. from another users conversation)

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[jboss-user] [JBoss Seam] - Re: @Unwrap question

[wschwendt]

"enzhao" wrote : Hi folks,
  | 
  | 1. What's the difference between @Factory and @Unwrap in the following two 
code fragments? (from reference section 3.8)
  | 


the Factory method gets only called if the referenced context variable, the 
factory method is defined for, is not yet bound to a value.  In your case the 
context variable is "customerList".   Once this context variable is set to a 
value, the factory won't be called anymore, when "customerList" gets referenced 
additional times.

In contrast, the method annotated with @unwrap gets called EVERY time the 
manager component with the name "customerList" is referenced.  



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[jboss-user] [JBoss Seam] - Re: @Unwrap question

[rlhr]

As far as I know, one difference is the way you are going to access your object.

If you use @Factory, you'll have to access it through the bean: 
#{myBeanName.myMethodName} (any first reference to myBeanName will trigger a 
call to the factory method)

Using unwrap, you directly use the bean name:  #{myBeanName} (the bean and any 
other methods remain hidden, only the result of the unwrap method is exposed).

There might be other differences, but I'm not aware of them...

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