Re: [Log4cplus-devel] Custom Appenders using Properties?‏

[Václav H. <v.h...@sh...>]

Nate Reid wrote, On 7.4.2011 2:27:
> I've subclassed FileAppender  with my own custom class and I would like to
> use the log4cplus properties system to configure the logging to use the
> custom class.  The problem is that it appears that the custom class needs to
> be registered with the AppenderFactory. However, it looks like the
> registration, although done at runtime with the call to
> initializeFactoryRegistry() from src/factory.cxx does the trick, it only
> registers the Appenders/etc that it's aware of.  It also looks like the
> FactoryTemp and support classes are an implementation detail of factory.cxx
> and do not appear to be accessible externally.  E.g. they are not defined in
> the factory header file.
> Is there a way to register custom Appenders/etc so that they can be used
> within a Property configuration?
> I'd like to have something like this:
> 
> // log.properties
> 
> log4cplus.rootLogger=DEBUG, Custom
> log4cplus.appenders.Custom=CustomNS::MyAppender
> ...
> 
> Thanks!
> -Nate
> 
> P.S.  sorry for cross-posting this to the wilx list as well.      
You can have that. Just get the appenders registry using
log4cplus::spi::getAppenderFactoryRegistry() and register your own custom
appender factory class inherited from log4cplus::spi::AppenderFactory with
all the appropriate member functions overriden. Something like this should do it:

class MyAppenderFactory : public log4cplus::spi::AppenderFactory
{
  virtual log4cplus::tstring getTypeName() {...}
  virtual SharedAppenderPtr createObject(const
log4cplus::helpers::Properties& props) {...}
};

log4cplus::getAppenderFactoryRegistry().put(std::auto_ptr<log4cplus::spi::AppenderFactory>(new
MyAppenderFactory));

-- 
wilx