Provide looser coupling of PatternConverters
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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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