Logging formatter in log4j sandbox

It is also worth mentioning that, unlike log4j, in log4net
the user does
not interact with the Logger directly but with a wrapper.
The Logger
(ILogger) has a Log method that is used to log all the
messages. The
wrapper LogImpl (implements ILog) has all the
Debug/Info/Warn/Error
methods which forward the log call to the Logger method. The
LogImpl
contains the Format methods. If a use wants a different
format
implementation they can write their own wrapper with user
callable
methods.

Nicko

> -----Original Message-----
> From: Curt Arnold [mailto:carnoldapache.org] 
> Sent: 19 March 2006 00:32
> To: log4net-devlogging.apache.org
> Subject: Logging formatter in log4j sandbox
> 
> I'm sure the timing sucks, but since the scuttling of
the 
> 1.2.10 release involves formatting log messages and I
have 
> recently been doing some things in the log4j sandbox, I

> thought that I would bring that work to your attention.
 The 
> project can be checked out from 
> http://svn.apache.org/repos/asf/logging/sandbox/
log4j/formatter.
> 
> One of the problems with adding formatting to the
Logger 
> class in log4j is that there are several widely used 
> formatting conventions:  
> java.text.MessageFormat has been in Java for quite some
time, 
> java.util.Formatter was just added in JDK 1.5 (similar
to C's
> sprintf) and the UGLI/SLF4J effort added a syntax
similar but 
> distinct to MessageFormat 
> (org.apache.log4j.helpers.MessageFormatter).  Currently
the 
> log4j code uses both java.text.MessageFormat (in the
l7dlog 
> methods) and o.a.l.helpers.MessageFormatter (in the 
> debug(String fmt, ...) methods.
> 
> The sandbox effort intention was to remove formatting
from 
> the Logger class and to allow the user to pick the
formatter 
> of their choice, while still being able to bypass
argument 
> boxing, array creation and formatting on calls below
the 
> threshold.  The formatter project adds three static
classes 
> LogMF, LogSF and LogF which log using the 
> java.text.MessageFormat, UGLI/SLF4J formatter and 
> java.util.Formatter respectively.  In use the code
would look like:
> 
> LogMF.debug(logger, "User  logged out after
 seconds", 
> username, duration);
> 
> The original discussion can be read at http://marc.theaimsgro
up.com/? 
> l=log4j-dev&m=113704872508753&w=2
> 
> I don't know the pattern syntax of the .NET formatter
in use. 
>  If it is similar to one of the Java formatters, then I
would 
> use the corresponding class name.  Otherwise, I would
choose 
> a slightly different name in case we ever wanted to
emulate 
> one of the Java formatters in .NET (actually, you might

> already be able to use java.text.MessageFormat from
J#).
> 
> p.s. I had intended to add ResourceBundle variants of
the 
> methods with signatures like:
> 
> static void debug(Logger logger, ResourceBundle bundle,

> String fmtKey, ...);
> 
> 
> 
>