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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Yet another Apender proposal: ListAppender
Date Mon, 18 Oct 2004 12:49:43 GMT

Hi,
Everything new is old again (or vice versa) ;)  This has been available
forever in the form of the CyclicBuffer, used by the SMTPAppender among
others.  You don't need a whole new Appender just for this.

Yoav Shapira http://www.yoavshapira.com
 

>-----Original Message-----
>From: Paul Smith [mailto:psmith@aconex.com]
>Sent: Sunday, October 17, 2004 6:43 PM
>To: Log4J Developers List
>Subject: RE: Yet another Apender proposal: ListAppender
>
>There is also the org.apache.log4j.VectorAppender which is already
there (I
>think it was mainly used for test case purposes, but it's still
useful).
>
>> -----Original Message-----
>> From: Paul Smith [mailto:psmith@aconex.com]
>> Sent: Monday, October 18, 2004 8:04 AM
>> To: Log4J Developers List
>> Subject: RE: Yet another Apender proposal: ListAppender
>>
>>
>> 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/apach
>> e/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: spam2004@meeque.de [mailto:spam2004@meeque.de]
>> > Sent: Saturday, October 16, 2004 6:32 AM
>> > To: log4j-dev@logging.apache.org
>> > 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.
>> >
>> >
>>
>>
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>>
>>
>>
>
>
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