That is not really what I want. Let me expand my example a bit:

void methodA() { Logger logger = LogManager.getLogger( "methodA" ); utilityMethod( ... ); ... }

void methodB() { Logger logger = LogManager.getLogger( "methodB" ); utilityMethod( ... ); ... }

void utilityMethod() { // Which logger do I use? }

The NDC only gives me a way to put context sensitive information in the logging statements. What I want is a way to get a Logger based on some type of logging context. In my example, I want fine grained control of my logging categories but, utilityMethod() may be called from different places. Here is what I would like to see:

void methodA() { Logger logger = LogManager.pushLoggingContext( "methodA" ); utilityMethod( ... ); ... LogManager.popLoggingContext(); }

void methodB() { Logger logger = LogManager.pushLoggingContext( "methodB" ); utilityMethod( ... ); ... LogManager.popLoggingContext(); }

void utilityMethod() { // Use the current logger. Logger logger = LogManager.getLoggingContext(); }

This, of course, could go on further too. utilityMethod() could change the current Logger before it calls some other method, etc.

Make sense? Tony

What I think you want to use either the Nested Diagnostic Context (NDC) or the Mapped Diagnostic Context that is part of log4j and then have your appenders output them.

The NDC is a stack that you can push things on as your code goes down the call stack. The MDC is useful as a ThreadLocal map that is often used to track such things as the User/IP etc of the user making the current request.

Probably best to see this JavaDoc:

MDC: http://logging.apache.org/log4j/docs/api/org/apache/log4j/MDC.html

NDC: http://logging.apache.org/log4j/docs/api/org/apache/log4j/NDC.html

cheers,

Paul Smith

On Mon, 7 Jun 2004, Tony Thompson wrote:

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