Stefan,
Could you please expand on the use case?
Stefan Armbruster wrote:
Hi,
is there a way to redirect log messages depending on a MDC variable to
different appenders? The logback manual only uses MDC values for the pattern
inside a single appender.
Example: assume, the code sets a MDC variable "context". If a log message is
supplied with context="A", it should be written to application_A.log, if it
has context="B", the message should be written to application_B.log, and so
on.
If this is not possible by default, it should be possible to write a kind of
MDCAwareAppenderWrapper like this (only pseudo code below):
public class MDCAwareAppenderWrapper<E> implements Appender<E> {
Map<String,Appender> appenderMap;
String mdcName;
... setters and getters omitted
public void doAppend(E event) {
LoggingEvent le = (LoggingEvent)event;
String mdcValue = le.getMDCPropertyMap().get(mdcName);
Appender appender = appenderMap.get(mdcValue);
appender.doAppend(event);
}
}
MDCAwareAppenderWrapper is configured by a Map<String,Appender> that maps MDC
values (A and B from the example above) to the real appenders.
Any hints or comments on that?
Kind regards,
Stefan
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