> 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 = [u...@dadfafd, .... etc..]
---
Or you just want a single line logging:
---
Created, User = [u...@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
> -----Original Message-----
> From: slf4j-user-boun...@qos.ch [mailto:slf4j-user-boun...@qos.ch] On
> Behalf Of Jiri Pejchal
> Sent: maandag 30 augustus 2010 22:56
> To: slf4j-user@qos.ch
> Subject: Re: [slf4j-user] separation of format and data
>
> "Ed Bras" <z...@debrasjes.com> writes:
>
> > I like to have more control over the output format and data input by
> > separating these things.
> > How can I do this?
> >
> > I would like to do something like this:
> > Logger.debug("some debug data", "Member", this.member, "Address",
> > this.address);
> >
> > Then the formatter would output something like this:
> > Some debug data.
> > Member= [mem...@dfsdf, id=2434, ....]
> > Address= [adr...@dafa, street=bla, postalCode=34324234, ...]
> >
> > The text between [] is the toString output.
> > I use this in other parts, like in my asserts and toString logging
> since a
> > few years now, and like it: development friendly, that is: easy usage
> in
> > code and readably output (especially with complex data structures
> this is a
> > requirement).
> >
> > I could do the above through a static Utils method, something like
> this:
> > UtilsLogger.debug(logger, "some debug data", "Member", this.member,
> > "Address", this.address);
> > And then the Utils method will construct the complete log statement
> with the
> > {} in it.
> > But might it not an idea to make this part of the Logger Facade?.. Or
> is
> > there a way to extend SLF4j to add this myself?
> >
> > Please some advice?
> > Ed
>
> I don't know if I understand you correctly, by I usually use something
> like:
>
> import static com.google.common.base.Objects.toStringHelper;
>
> public class User {
> private Long id;
> private String firstName;
> private String lastName;
>
> @Override
> public String toString() {
> return toStringHelper(this).
> add("id", id).
> add("firstName", firstName).
> add("lastName", lastName).
> toString();
> }
> }
>
>
>
>
> userService.create(user);
> logger.info("Created {}", user);
>
> And the result is:
> 22:50:51.116 [http-8084-1] INFO cz.asterix.beans.DataInitBean
> (DataInitBean.java:71) Created User{id=1, firstName=Jan,
> lastName=Novak}
>
>
>
> Jiri Pejchal
>
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