[logback-dev] how to get appender-ref list via Joran

[Ceki Gulcu]

Are you at all familiar with Joran? See [1] for documentation.

The AppenderRefAction class in the  ch.qos.logback.core.joran.action package 
shows what the steps taken when an "apprend-ref" element is encountered. See [2] 
for the actual code.

However, if you wish to encapsulate only one single appender within 
AsyncAppender, then your job should be quite easy. You don't need to get an 
appender by name. to Just declare a property called "appender" of type 
ch.qos.logback.core.Appender and let Joran's implicit actions take care of all 
the details. For implicit actions see [3].

The configuration would look like:

<appender name="async" class="logback.AsyncAppender">
   <bufferSize>20</bufferSize>
   <!-- nested appender configuration goes here -->
   <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
     <layout>
       <pattern>%d %logger{36} - %msg%n</pattern>
     </layout>
   </appender>
</appender>

Once that works, you could deal with multiple appenders. (Just ask here again.)

HTH,

[1] http://logback.qos.ch/manual/onJoran.html
[2] 
http://logback.qos.ch/xref/ch/qos/logback/core/joran/action/AppenderRefAction.html
[3] http://logback.qos.ch/manual/onJoran.html#implicit

Cheenu wrote:
> Seems something simple enough.
> But I can't figure out - any of you mind telling me?
> 
> Thanks
> 
> On Mar 2, 2009, at 2:00 PM, Cheenu wrote:
> 
>> I am trying to develop a new appender for Async logging - a 
>> non-blocking appender similar to 
>> http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/AsyncAppender.html 
>>
>>
>> Config is like:
>>     <appender name="async" class="logback.AsyncAppender">
>>         <bufferSize>20</bufferSize>
>>         <appender-ref ref="stdout" />
>>         <appender-ref ref="file" />
>>     </appender>
>>
>> Question:
>> How do I get list of appenders (the appender-ref's) in my code?
>>
>> Thanks


-- 
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch