[logback-user] How to send one event to more than one appender using the SiftingAppender?

[diroussel]

Johannes,

I can't see how that would work at the moment.

SiftingAppender keeps it's child appenders, and when a log events comes in
it will only log to one of them.

I suppose, if you can write a custom appender that gets a reference to the
SiftingAppender, then you can do this:

class FanOutAppender implements Appender {
  SiftingAppender sift;
  void doAppend(E event) {
    // Fan out log event to all child appenders of sift
    for (Appender a : sift.getAppenderTracker().valueList()) {
     a.doAppend(event);
    )
  }
}

And that will log to all appenders.  The trick is using filters so your log
event goes to either the sifting appender or your custom FanOutAppender

David



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