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

[Cheenu]

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