static/inherit problem

[wleana <wl...@yahoo.com>]

Hi, I have a design issue related to the fact that the Logger needs 
to be static. And suppose I have A and its subclass B.
 
I have a wrapper MyLog that wraps around Logger and a myId field of 
each class, in which, the log message always print out myId of its 
caller.

class A {
private static MyLog mLog;
protected myId;
A(){
  myId = "A";
  init myLog with myId...
}

public void doSth(String aMsg){
   mLog.debug(aMsg);
}
} 

class B extends A{
B(){
 myId = "B";
 super()
 }
}

When I do this:
B b=new B();
b.doSth("blah");

The log will actually show the caller's myId is "A", instead of "B".
(you see I even make the myId field non-static because of the same 
issue, but actually I would like it to be static conceptually)

I have tried different ways, it only works if mLog is not static, the 
within doSth from class A, it will actually dynamically use object of 
type B's mLog...But we want the Logger class (or its wrapper class) 
to belong to class not to an object...how should we solve this? What 
should be the right design of this? Please share your thoughts. 

Thanks a lot.
-wleana


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Re: static/inherit problem

[wleana <wl...@yahoo.com>]

I really don't think this should be the reason to make the Logger (or 
its wrapper) an instance variable of each class...this should be a 
fairly common problem , how do you guys handle it?

Do you have each class define and/or initialize its own Logger?
If you have a superclass and a subclass, does your subclass inherit 
superclass's Logger?

Thanks,
-wleana


--- In Log4J@yahoogroups.com, "wleana" <wl...@y...> wrote:
> Hi, I have a design issue related to the fact that the Logger needs 
> to be static. And suppose I have A and its subclass B.
>  
> I have a wrapper MyLog that wraps around Logger and a myId field of 
> each class, in which, the log message always print out myId of its 
> caller.
> 
> class A {
> private static MyLog mLog;
> protected myId;
> A(){
>   myId = "A";
>   init myLog with myId...
> }
> 
> public void doSth(String aMsg){
>    mLog.debug(aMsg);
> }
> } 
> 
> class B extends A{
> B(){
>  myId = "B";
>  super()
>  }
> }
> 
> When I do this:
> B b=new B();
> b.doSth("blah");
> 
> The log will actually show the caller's myId is "A", instead of "B".
> (you see I even make the myId field non-static because of the same 
> issue, but actually I would like it to be static conceptually)
> 
> I have tried different ways, it only works if mLog is not static, 
the 
> within doSth from class A, it will actually dynamically use object 
of 
> type B's mLog...But we want the Logger class (or its wrapper class) 
> to belong to class not to an object...how should we solve this? 
What 
> should be the right design of this? Please share your thoughts. 
> 
> Thanks a lot.
> -wleana
> 
> 
> --------------------------------------------------------------------
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> To unsubscribe, e-mail: log4j-user-unsubscribe@j...
> For additional commands, e-mail: log4j-user-help@j...


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