I think I already have just such an appender within the Chainsaw package. I might refactor it out into the main log4j core too. The appender implementation exposes a ListModel of it's events it is given.
You can see it here: http://cvs.apache.org/viewcvs.cgi/logging-log4j/src/java/org/apache/log4j/ch ainsaw/messages/MessageCenterAppender.java?view=markup Here's a TinyURL for the above: http://tinyurl.com/5bvv4 cheers, Paul Smith > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Saturday, October 16, 2004 6:32 AM > To: [EMAIL PROTECTED] > Subject: Yet another Apender proposal: ListAppender > > > Hello folks! > > Probably this is getting too frequent now, but I'd like to propose a new > Appender, too. I guess it is not so sophisticated and usefull as the > MultiplexAppender proposed recently, but therefore it is small and > simple. It's only one class, so I've simply attached it to this mail. > The Javadoc coments are rather low quality, but they should give a good > idea about how it works. > > My motivation was, to store some LoggingEvents in my application, so > that they could be presented in its GUI later. In particular, was > writing some complex import filter, and was logging all import steps > with Log4j. But I also wanted to give the user some direct feedback > about the progress. Instead of accumulating messages for the GUI > seperately, I decided to use the existing Log4j infrastructure for this. > This would reduce the additional logging code in the import. > > However the GUI is asynchronous to the import, so I needed to store the > LoggingEvents somewhere, and retrive them, whenever they should be > rendered. Of course, I could have used some Appender writing to a file, > and parse that file to display the events. But in fact the GUI didn't > need to make the events persistent, it just needed them in memory. So I > wrote that simple ListAppender, which buffers the LoggingEvents in a > List. The application using this Appender has full control of the List, > and can retrive or modify the stored LoggingEvent whenever it wants. > > I could't find any similar Appender in the Log4j API docs. So either > you're in need of it, or it is completely unusefull for anyone else. > Please have a look at it, and decide yourself. If you think any of the > code could be usefull for Log4j, please feel free to use it. > > Regards, > Michael > > PS: Thanks for all the other Appenders and Log4j in general. It's been > very usefull for me, so far. > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
