> $${mdc:request_id} in a pattern should cause the request_id to be evaluated
> on every event.
>
thanks a lot, $${ctx:request_id} seems to do the trick
however, the computation of the default value is quite complex as it always
involves
a variable substitution, and I cannot use conversion specifiers with $$ as I
can with %X
Would you consider accepting a patch that adds support for slf4j-like default
values
in %X{key} and %K{key}, s.th. like %X{key:-defaultValue} ?
Regards,
Oliver
>
>> On Sep 30, 2013, at 8:04 AM, Oliver Flege <[email protected]> wrote:
>>
>> ok, this works for ${...} expressions in the configuration, but I don't see
>> how it would
>> apply to pattern evaluation. To simplify and rephrase my original question:
>>
>> Given a pattern layout with a pattern like: %X{REQUEST_ID}
>>
>> is it possible to define a default value that will be printed
>> if the thread never executed ThreadContext.put("REQUEST_ID", "XYZ")?
>>
>> I tried ${mdc:REQUEST_ID} + a Property REQUEST_ID, but that
>> will only be evaluated when the configuration is parsed.
>>
>> Oliver
>>
>>> Yes, it supports default values. Specify them as properties at the
>>> beginning of your configuration. Then when you specify something like
>>> ${sys:foo} if foo is not defined as a system property the default value
>>> will be used,
>>>
>>> Ralph
>>>
>>>> On Sep 30, 2013, at 3:30 AM, Oliver Flege <[email protected]> wrote:
>>>>
>>>> Hi,
>>>>
>>>> I am considering to switch from slf4j/logback to log4j2;
>>>>
>>>> in slf4j/logback, I can specify a default value for a missing mdc entry
>>>> like this:
>>>>
>>>> <pattern>%d{HH:mm:ss} %X{FOO:--} %c{0} - %m%n</pattern>
>>>>
>>>> which would print "-" if mdc.get("FOO") is null (the ":-" separates
>>>> the key and the default value).
>>>>
>>>> Having a defined number of tokens/fields at the beginning of the log
>>>> message
>>>> makes it easier to process it with awk/cut etc.
>>>>
>>>>
>>>> Does log4j support default values? - I could not find any hint in the
>>>> documentation
>>>>
>>>>
>>>>
>>>> Regards,
>>>> Oliver
>>>>
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>>
>>
>> --
>> Oliver Flege
>> Senior Software Engineer | vwd group
>>
>> vwd Vereinigte Wirtschaftsdienste AG
>> Stiftsplatz 6/7 | 67655 Kaiserslautern
>> Telefon: +49 631 3649-0 | Telefax: +49 631 3649-109
>> [email protected] | www.vwd.com
>> ______________________________________________________________
>>
>> vwd Vereinigte Wirtschaftsdienste AG
>> Sitz der Gesellschaft: Tilsiter Straße 1 | 60487 Frankfurt am Main
>> Handelsregister: AG Frankfurt am Main HRB 81011
>> Vorstand: Dr. Ralf Kauther
>> Vorsitzender des Aufsichtsrates: Dr. Thorsten Dippel
>> ____________________________________________________________
>>
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>
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>
--
Oliver Flege
Senior Software Engineer | vwd group
vwd Vereinigte Wirtschaftsdienste AG
Stiftsplatz 6/7 | 67655 Kaiserslautern
Telefon: +49 631 3649-0 | Telefax: +49 631 3649-109
[email protected] | www.vwd.com
______________________________________________________________
vwd Vereinigte Wirtschaftsdienste AG
Sitz der Gesellschaft: Tilsiter Straße 1 | 60487 Frankfurt am Main
Handelsregister: AG Frankfurt am Main HRB 81011
Vorstand: Dr. Ralf Kauther
Vorsitzender des Aufsichtsrates: Dr. Thorsten Dippel
____________________________________________________________
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