Add support for type aliases in config file
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Key: LOG4NET-30
URL: http://issues.apache.org/jira/browse/LOG4NET-30
Project: Log4net
Type: New Feature
Reporter: Ron Grabowski
Priority: Trivial
IBatisNet uses "type" attributes in their xml config files:
type="Company.Project.Foo.Data.Entity.Product, Company.Project.Data"
type="Company.Project.Foo.Data.Entity.Category, Company.Project.Data"
type="Company.Project.Foo.Data.Entity.User, Company.Project.Data"
to save the user from having to re-type long strings every time something
references a Product, Category, etc. They define an <alias> node that contains
<typeAlias> entries:
<alias>
<typeAlias alias="Product" type="Company.Project.Foo.Data.Entity.Product,
Company.Project.Data" />
<typeAlias alias="Category" type="Company.Project.Foo.Data.Entity.Product,
Company.Project.Data" />
<typeAlias alias="User" type="Company.Project.Foo.Data.Entity.Product,
Company.Project.Data" />
</alias>
Wherever I have to specify a type, I may use one of the aliases I defined at
the top of the file.
It would be nice if log4net supported a similiar concept. It would also be nice
if log4net shipped with some default aliases. I think normal casing would be ok:
FileAppender -> log4net.Appender.FileAppender
An example incorporating the above suggestions would be (this will probably
wrap when it posts to the mailing list):
<alias>
<typeAlias alias="SessionContextPatternConverter"
type="log4netAspExtensions.SessionContextPatternConverter,
log4netAspExtensions" />
<typeAlias alias="CacheContextPatternConverter"
type="log4netAspExtensions.CacheContextPatternConverter, log4netAspExtensions"
/>
<typeAlias alias="RequestContextPatternConverter"
type="log4netAspExtensions.RequestContextPatternConverter,
log4netAspExtensions" />
<typeAlias alias="ApplicationContextPatternConverter"
type="log4netAspExtensions.ApplicationContextPatternConverter,
log4netAspExtensions" />
</alias>
<appender name="LoginFileAppender" type="FileAppender">
<file value="c:/inetpub/wwwroot/Logs/Logins.txt" />
<layout type="PatternLayout">
<converter>
<name value="asp-session" />
<type value="SessionContextPatternConverter" />
</converter>
<conversionPattern value="%5p %d (%c:%L) - [%asp-session{UserId}] %m%n" />
</layout>
</appender>
I haven't fully looked into the <convertor> node to see if it can support this
style of attributes but an even shorted syntax might be:
<appender name="LoginFileAppender" type="FileAppender">
<file value="c:/inetpub/wwwroot/Logs/Logins.txt" />
<layout type="PatternLayout">
<converter name="asp-session" type="SessionContextPatternConverter" />
<conversionPattern value="%5p %d (%c:%L) - [%asp-session{UserId}] %m%n" />
</layout>
</appender>
It should be possible to overwrite the builtin aliases. Had I overridden
FileAppender:
<typeAlias alias="FileAppender" type="log4netAspExtensions.AspNetFileAppender,
log4netAspExtensions" />
I would be able to declare my appender with support for the ~ character:
<appender name="LoginFileAppender" type="FileAppender">
<file value="~/Logs/Login.txt" />
<layout type="PatternLayout">
<converter name="asp-session" type="SessionContextPatternConverter" />
<conversionPattern value="%5p %d (%c:%L) - [%asp-session{UserId}] %m%n" />
</layout>
</appender>
I think that the above changes would descrease the size of the config file and
increase the files readability.
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