Jess Holle wrote:
Thanks.
I'm also starting to ponder whether there's a mostly compatible way to
reduce locking in AppenderSkeleton and WriterAppender.
For instance, we could add a special Layout interface that would allow
the String to be pre-computed prior to holding the lock (but after
filters and thresholds).
That's just an idea, but I'm looking for something that does any
message to String conversion and formatting without holding a lock on
the Appender, which would be a source of potential deadlock and
unnecessarily limit the (multi-threaded) throughput of log4j.
Argh! Popular layouts, e.g. PatternLayout, are far from thread safe.
The only thing that saves them today is that they are used in a
single-threaded manner due to the locking in AppenderSkeleton.
--
Jess Holle
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