On Apr 27, 2005, at 10:21 AM, Jason Calabrese wrote:
Hi everyone,
I was just about to start using the ExternallyRolledFileAppender when I noticed that it was removed from cvs.
Why was it removed? Has it been replaced by something else.
I wasn't aware of an ExternallyRolledFileAppender and didn't see it in the obvious places in the CVS attic.
log4j 1.3 adds a new architecture for rolling file appenders with pluggable triggering and naming policies. In addition to the time and size based triggers to support log4j 1.2 rolling behaviors, o.a.l.rolling.FilterBasedTrigger (in CVS but not in any release yet) can be used to force rolling based on the content of a message and if that is not adequate you could develop your own trigger. If either case, you will need to dispatch a message to force evaluation of the trigger.
To see an example of message triggered rolling see tests/input/rolling/filter1.xml and tests/src/java/org/apache/log4j/rolling/FilterBasedRollingTest.java.
I would appreciate any feedback, positive or otherwise.
p.s. The signature for o.a.l.Rolling.TriggeringPolicy.isTriggeringEvent is likely to change. The File parameter is used in the size based trigger, but the size returned from File.length() is unreliable during logging on Windows. My current thinking is to keep a running size of the log within the appender and pass that to the trigger which might result in a signature like:
boolean isTriggeringEvent(final Appender appender, final long length, final LoggingEvent event);
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