On Sep 27, 2007, at 10:38 AM, [EMAIL PROTECTED] wrote:
Hello again :)
I just digged a little deeper into the log4cxx project (awesome
amount of code, that is ;) ) And found out something strange:
The write(event); method which the Socket Appender uses to send
it's events is all #if 0'ed out in loggingevent.cpp - therefore
nothing is being sent via socket. Why is that? I would need to
modify the appender anyways since I only want to send the message
itself, not the event wrapped around it (because I have several
languages talking to the same server) but I assumed I would at
least find a working preset. Can anyone explain this to me
please? :) I checked both the revisions that came with the VS2005
Project file and the latest svn, both have the write #if 0'ed out.
With regards,
Johannes Frank
There are two open and long standing bug reports that address this:
https://issues.apache.org/jira/browse/LOGCXX-7
https://issues.apache.org/jira/browse/LOGCXX-121
Basically, SocketAppender in log4j 1.2 uses Java serialization to
serialize an org.apache.log4j.spi.LoggingEvent instance and then
transmit the serialized representation of the event. Chainsaw can
deserialize that representation and recreate an
org.apache.log4j.spi.LoggingEvent instances and use those to update
the viewer.
log4cxx and log4net both implemented appenders named SocketAppender,
but they did not attempt to replicate the serialized form used by the
log4j SocketAppender, so you could not connect a log4cxx
SocketAppender to Chainsaw and have it work. Actually, I have no
idea what you could connect either to since there aren't any matching
receivers provided by the projects and no one reported that they had
developed one.
When the log4cxx LoggingEvent was changed to support Unicode strings,
the implementation of SocketAppender was stubbed out since it didn't
make sense to spend time reworking the existing implementation before
figuring out how to write a version that was compatible with the
log4j binary format.
The XMLSocketAppenders in log4cxx and log4net do work with Chainsaw.
If you are trying to support multiple languages, I use those or
replicate their format if you want to support yet another language.
In a perfect world, there would be an XMLSocketAppender in log4j and
log4j-compatible SocketAppenders in log4cxx and log4net. Technically
it is possible, but hasn't happened due to resource limitations. If
you'd like to pitch in, feel free to contribute.
