[slf4j-user] separation of format and data

[Ed Bras]

> I don't know how to do it with logback. Personally I would use
> something
> similar to:
> 
> public static String toLogString(Object... arguments){
>         StringBuilder str = new StringBuilder();
>         for (Object object : arguments) {
>             str.append(object.toString()).append('\n');
>         }
>         return str.toString();
> }

Thanks, I am familiar with these methods/constructions, used them myself
till I made my own (such that I can change it during compile time with GWT).
Buttttt anyway: this isn't really what I want. 
It would be nice if I could extend the Logger class in someway such that I
can add my own facade methods like the ones explained below.
Ed


> -----Original Message-----
> From: slf4j-user-bounces at qos.ch [mailto:slf4j-user-bounces at qos.ch] On
> Behalf Of Jiri Pejchal
> Sent: dinsdag 31 augustus 2010 0:46
> To: slf4j-user at qos.ch
> Subject: Re: [slf4j-user] separation of format and data
> 
> "Ed Bras" <zooi at debrasjes.com> writes:
> 
> >> userService.create(user);
> >> logger.info("Created {}", user);
> >
> > Thanks, and yes that is what I also do, but I want more control.
> > For a single message I would do something like this:
> >    logger.info("Created", "User", user);
> > or, to use the fluent api like in your example:
> >   logger.info("Created").add("User", user);
> > BTW: this latter case might not such a good idea as I think it's not
> good
> > for performance, as in case it concerns a debug call with debug
> disabled,
> > all the add() calls always will be executed...
> >
> > Anyway, your example contains both data and the output format which
> is
> > created through the {} combination...
> > I want to extract the "format information" into the "log
> configuration"
> > (e.g.: logback.xml).
> > Such that in my configuration I can specify that the output has to
> look like
> > for example:
> > ---
> > Message: Created
> > Data:
> > User = [User at dadfafd, .... etc..]
> > ---
> >
> > Or you just want a single line logging:
> > ---
> > Created, User = [User at dadfafd, .... etc..]
> > ---
> >
> > The latter case is nice for simple logging, but in case of logging
> complex
> > Value objects, this is too simple, as the lines become too large and
> > unreadable...
> > Conclusion: more control.
> >
> > Besides the simple example you point out, I am more thinking of
> examples
> > that contain more data, something like this:
> >    logger.debug("Created.\nUser:{}\nAddress:{}\nHistory:{}", user,
> > currenAddress, addressHistory);
> > Note how the format is included in the message and doesn't look so
> nice...
> > It would look better if you would have something like:
> >    logger.debug("Created., "User", user, "Address", currentAddress,
> > "History:", addressHistory);
> > Or:
> >    logger.debug("Created., user, currentAddress, addressHistory);
> > Basically the call would be something like this:
> > 	debug(String message, String description1, Object obj1, String
> > description2, Object obj2, String description3, Object obj3)
> > or
> > 	debug(String message, Object obj1, Object obj2, Object obj3)
> >
> > I hope I made it a bit more clear through the above examples?
> > Of course, in most cases "simple logging" is sufficient, however, in
> the
> > complex projects I am in the last few year, I really need this
> > functionality.
> > Please some advice how to realize this ?
> > I was thinking about extending the current Logger and returning it
> from the
> > Factory, but haven't looked in to it if this is a good idea... just a
> > thought....
> >
> > Ed
> 
> Hm,
> 
> I don't know how to do it with logback. Personally I would use
> something
> similar to:
> 
> public static String toLogString(Object... arguments){
>         StringBuilder str = new StringBuilder();
>         for (Object object : arguments) {
>             str.append(object.toString()).append('\n');
>         }
>         return str.toString();
> }
> 
> Or apache.commons.lang has
> ToStringBuilder(Object object, ToStringStyle style)
> where you can specify your own ToStringStyle
> http://people.apache.org/~bayard/commons-lang-3.0-snapshot-
> api/org/apache/commons/lang/builder/ToStringStyle.html
> 
> Jiri Pejchal
> 
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