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From Sahraei Sasan-ssahra01 <sasan.sahr...@motorola.com>
Subject RE: Instance logging
Date Fri, 14 Nov 2003 14:12:30 GMT
Lets look at it this way,

class A can be initialized with different params.

say then we will have running instances of A like

A(device1)

A(device2)

A(device3)

etc,

so the class type is the same but it has only initilized with different params, so how can
I give it different loggers , even if I initialize loggers depending on e.g. device1, device2,
etc these names can not be known during coding and I have to be able to change the loggin
level during run time. 

btw, please keep in mind that I am pretty new in using log4j , I'm still kind of confused
as how the inheritance will work in here and how can I create different catagories of loggers.

-----Original Message-----
From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
Sent: 14 November 2003 14:06
To: Log4J Developers List
Subject: RE: Instance logging



Howdy,
You would have to use different logger names for the different forms.
Either with a hashcode based approach or by just assigning them names,
e.g. "loggerForDevice1" and "loggerForDevice2".  But it sound like you
might also just want to make them different classes (probably subclasses
of a common parent).

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Sahraei Sasan-ssahra01 [mailto:sasan.sahraei@motorola.com]
>Sent: Friday, November 14, 2003 8:59 AM
>To: 'Log4J Developers List'
>Subject: RE: Instance logging
>
>I want to change the logging level while instances of the same class
are
>running, so this makes it difficult as how do I know that is the output
of
>
>getClass() + String.valueOf(hashCode())
>
>because I want to change the level from the log4j.properties.
>
>What I want to know if, say, multiple forms (of the same class type)
are
>running to monitor different devices, let's say one them is behaving
>strange, so I need to change the debug level of only that one.
>
>S.
>
>
>-----Original Message-----
>From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
>Sent: 14 November 2003 13:53
>To: Log4J Developers List
>Subject: RE: Instance logging
>
>
>
>Howdy,
>You can't if you associate the logger with the class rather than the
>instance, which is what most people do.  Most people do something like:
>private static final Logger LOGGER = Logger.getLogger(ThisClass.class);
>
>In that case all instances of ThisClass at runtime share the same
>logger.  However, there's nothing to prevent you from having different
>loggers for each instance.  For example, you could do:
>
>private Logger logger;
>
>public ThisClass() {
>  logger = Logger.getLogger(getClass() + String.valueOf(hashCode());
>}
>
>Then you can individually modify the level for the Logger if you're
>given the ThisClass object.
>
>But this is kind of unusual, why do you want to do it?
>
>Yoav Shapira
>Millennium ChemInformatics
>
>
>>-----Original Message-----
>>From: Sahraei Sasan-ssahra01 [mailto:sasan.sahraei@motorola.com]
>>Sent: Friday, November 14, 2003 8:49 AM
>>To: 'Log4J Developers List'
>>Subject: Instance logging
>>
>>Hi,
>>
>>A question about log4j. Is I create a category of logging for a class
>type
>>and during run time if multiple instances of that class are running
and
>I
>>just want to change the logging level for only one running instance of
>that
>>class type, what would be the way?
>>
>>Thanks,
>>S.
>>
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>
>
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