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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LOG4J2-19) Provide looser coupling of PatternConverters
Date Sat, 15 May 2010 06:47:41 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-19?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867813#action_12867813
] 

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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