RE: Categories for Inner Classes

[Jim Moore]

You have four basic options:

class A1 {
  static final Category LOG_B = Category.getInstance(B.class);
  class B {
    void m() {
      LOG_B.info("Log msg");
    }
  }
}

class A2 {
  static class B {
    static final Category LOG_B = Category.getInstance(B.class);
    void m() {
      LOG_B.info("Log msg");
    }
  }
}

class A3 {
  class B {
    final Category LOG_B = Category.getInstance(B.class);
    void m() {
      LOG_B.info("Log msg");
    }
  }
}

class A4 {
  class B {
    void m() {
      Category LOG_B = Category.getInstance(B.class);
      LOG_B.info("Log msg");
    }
  }
}

A1 is efficient, but put the Category outside of where it "should" be.  A2
is efficient and puts it where it "should" be, but only works if B does not
need instance info from A2.  A3 is less efficient since every instance of B
will have to do the lookup and contain a the reference.  (As Craig said,
though, there's only one INSTANCE of the Category ever created, so that's
not a problem.)  A4 is even less efficient since that lookup is done each
time the method is called, but no extra reference is maintained.

>From there it is the standard engineering decisions between simplicity,
speed and space.

-Jim Moore


-----Original Message-----
From: Craig Newlander [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 17, 2001 4:14 PM
To: LOG4J Users Mailing List
Subject: RE: Categories for Inner Classes


I ran into the same scenario,  The Catergoy Object is a factory so all
"instances" of Category using the same
foo.class will reference the same instance anyways.   Can you give the inner
class a name?


-----Original Message-----
From: Stephen Levinson [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 17, 2001 3:02 PM
To: 'LOG4J Users Mailing List'
Subject: Categories for Inner Classes


Hi all...

        In setting categories for classes I am using a STATIC instance of
Category ... sending in the class name.

        If I have an inner class I'd like to be able to set a category with
ITS OWN NAME... but I can't use a STATIC in the inner class.

        Is there any way to have the category for an inner class have its
own name?

Thanks in Advance, Stephen

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