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https://issues.apache.org/jira/browse/LOG4J2-19?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867813#action_12867813
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Ralph Goers commented on LOG4J2-19:
-----------------------------------
In my experimental branch I used plugins to accomplish this. A converter
provides to annotations, one to declare it as a converter plugin and one to
identify the keys that it matches on.
> Provide looser coupling of PatternConverters
> --------------------------------------------
>
> Key: LOG4J2-19
> URL: https://issues.apache.org/jira/browse/LOG4J2-19
> Project: Log4j 2
> Issue Type: Improvement
> Components: Layouts
> Reporter: Ralph Goers
>
> Currently, PatternLayout calls PatternParser which knows about the various
> PatternConverters, many of which are imbedded in it. This makes it difficult
> for users to add their own Converters.
> In the logging framework I created each converter identified the conversion
> characters it supported. Each PatternConverter was required to supply a
> getKeys() method that returned this list. The equivalent of the PatternLayout
> contained an array of PatternConverters. During initialization each of these
> would be called and the list of keys recorded along with the associated
> converter. To add your own converter all that was necessary was to extend the
> class and add your new keys to the list of recorded keys along with their
> converters. The base PatternLayout would then take care of calling the
> correct converters as necessary.
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