[logback-user] Compiler selecting wrong Logger method

Tony Trinh tony19 at gmail.com
Mon Feb 13 18:24:08 CET 2012

I'm a fan of this idea (if you couldn't already tell). A couple
disadvantages that come to mind is lack of syntax-checking in the string
and painful refactoring (it requires the programmer to search every
formatted string for correctness). In any case, what would be the
appropriate action for syntax errors that are discovered at runtime?


On Mon, Feb 13, 2012 at 12:17 PM, Tony Trinh <tony19 at gmail.com> wrote:

> +1 !!
> On Mon, Feb 13, 2012 at 11:47 AM, Chris Pratt <thechrispratt at gmail.com>wrote:
>> Sure, it uses an extension of the java.text.MessageFormat syntax that
>> allows for unlimited formatted varargs, and allows using dot-notation to
>> prevent evaluation of the methods until it's been deemed necessary.  With
>> the current libraries (all of them really), you have to evaluate all the
>> javabeans that hold the data you are looking to log before it's decided
>> whether to log the information or not.  In other words:
>> log.debug("Loading Student [" + sdnt.getNumber() + "] " + sdnt.getName()
>> + " Enrolled: " + new SimpleDateFormat("yyyy-MM-dd").format(sdnt.
>> getEnrollmentDate()));
>> Means that a lot of work is done and discarded when the debug level on
>> this file is set to info or less.  SLF4j is a little better, but not much:
>> log.debug("Loading Student [{}] {} Enrolled: {}",new Object[] {sdnt.
>> getNumber(),sdnt.getName(),new SimpleDateFormat("yyyy-MM-dd").format
>> (sdnt.getEnrollmentDate())});
>> Yes, of course you could (and probably should) wrap each and every call
>> to the log system in if(log.isDebugEnabled()) {}.  But we all know that
>> is ugly and easy for Jr programmers to forget.  My library puts off the
>> evaluation until after it's been decided that the information is necessary,
>> then efficiently outputs the message, like this:
>> log.debug("Loading Student [{0.number}] {0.name} Enrolled:
>> {0.enrollmentDate,date,yyyy-MM-dd}",student);
>> No muss, no fuss and the TextFormat utility is completely usable
>> standalone (as well as the advanced dot-notation utilities).
>>    (*Chris*)
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