Hi all
After having thought during the weekend I think Patrick's suggestion of
Decorator Pattern would be the easiest way to go.
Pro:
- The enhancement applies to all FileAppender
- There is no need to touch the code of the existing file appenders. They work
the same way as until now (except the append property is always true)
Contra:
- A new feature in xml config would be needed (see below)
- Since property config is no more supported the MultiFileAppender would only
be available with xml configurations
A proposal for configuring the MultiFileAppender with new tag "classparam":
<appender name="Multi_Appender" class="org.apache.log4j.MultiFileAppender">
<classparam name="fileAppender"
class="org.apache.log4j.DailyRollingFileAppender">
<param name="file" value="myLog.log"/>
<param name="DatePattern" value="yyyy-MM-dd"/>
...
</classparam>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{dd.MM.yy HH:mm:ss.SSS}
%m%n"/>
</layout>
<classparam name="fileNamePolicy"
class="my.company.LogFileNameBuilder"/>
</appender>
The idea is that a param of a configured item can be a class as well, with own
properties. The configurator would recursively instantiate the enclosed classes
and then call the setFileAppender() of the MultiFileAppender.
Heri
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