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https://issues.apache.org/jira/browse/LOG4J2-1154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185243#comment-15185243
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Matt Sicker commented on LOG4J2-1154:
-------------------------------------
filter(LogEvent) is used at the appender level (technically on
AppenderControl), while the other filter methods are applied at the logger
level (technically on Logger.PrivateConfig). At least that's what I gather from
the source. I have no idea what "Context Filter" means.
> Javadoc for AbstractFilter wrong?
> ---------------------------------
>
> Key: LOG4J2-1154
> URL: https://issues.apache.org/jira/browse/LOG4J2-1154
> Project: Log4j 2
> Issue Type: Documentation
> Components: Filters
> Affects Versions: 2.4
> Reporter: Philipp Knobel
>
> The class org.apache.logging.log4j.core.Filter has as javadoc for the filter
> methods just the description: *Filter an event.*
> The org.apache.logging.log4j.core.filter.AbstractFilter has as description
> for three of the filter methods:
> * Appender Filter method. The default returns NEUTRAL.*
> could you clarify when each of these will be called?
> And the last one *filter(LogEvent)* has as decription *Context Filter method.
> The default returns NEUTRAL.*
> But this method isn't called, when I configure the filter as context filter.
> My config looks like:
> {code}
> <configuration name="test" packages="my.package">
> <MyFilter/>
> <Appenders>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout
> pattern="m%n"
> charset="UTF-8"/>
> </Console>
> </Appenders>
> <Loggers>
> <root level="DEBUG">
> <AppenderRef ref="Console"/>
> </root>
> </Loggers>
> </configuration>
> {code}
> And btw., do I understand it correctly that each logger calls all Context
> Filter as well? So that the only benefit of a context filter is that it's
> shared acrossed Logger, but not actually allowing reducing the invocation
> count of the filter as if it was defined for each Logger?
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