SiftingAppender and the lifecycle of created appenders
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Key: LBCLASSIC-316
URL: http://jira.qos.ch/browse/LBCLASSIC-316
Project: logback-classic
Issue Type: Improvement
Components: appender
Affects Versions: 1.0.0
Environment: servlet container
Reporter: Guus Bloemsma
Assignee: Logback dev list
I'm using SiftingAppender to create logfiles per servlet request. I wrote a
servlet filter to add session and request id's into MDC. A custom appender
(nested into SiftingAppender) buffers all logging events. Only when a WARN or
ERROR occurred it writes all of them at the end of the servlet request to yet
another nested appender. Logback made this surprisingly easy!
This all works fine except for one little problem. The SiftingAppender creates
a new custom appender for each request. It uses a AppenderTrackerImpl to keep
track of them. That AppenderTrackerImpl holds on to those appenders for half an
hour even though it is guaranteed that they won't be needed after the request.
That is a lot of unused appenders!
Being able to configure that timeout per SiftingAppender would be one solution.
Another way would be to make the method
ch.qos.logback.core.sift.AppenderTrackerImpl.isEntryStale(Entry, long) check
whether the appender in the entry is stopped. In that case it should be treated
as stale as well. My custom appender would simply stop itself once it is no
longer used.
BTW, I understand that I'm kind of abusing SiftingAppender. Maybe I should just
make my own...
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