How Log4j must be working?

["Bhangale, Bhushan" <Bh...@g-trade.com>]

Hi All,
 
I am wondering how log4j is built?
 
I understand that it works on a event driven model. I guess this event
driven model is based on Queue data structure where from one side all the
events are getting stored by the function which we call like log.info(),
log.error() etc. The log4j thread must be running continuously on the Queue
to read the event from other end and do something.
 
Am I right? What is the best java collection class to use as a Queue?
 
Thanks & Regards 
Bhushan Bhangale 
Sr. Software Engineer 
Fusion Infotech India Private Ltd. 
Ph. no. - 1-212-641-6932 (O) 
 


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RE: How Log4j must be working?

[Thomas Muller <tt...@online.no>]

 | I am wondering how log4j is built?

If you want to know more about the internals of Log4j I suggest you read
available documentation and the sourcecode.

 | I understand that it works on a event driven model. I guess this event
 | driven model is based on Queue data structure where from one side all the
 | events are getting stored by the function which we call like log.info(),
 | log.error() etc. The log4j thread must be running continuously
 | on the Queue
 | to read the event from other end and do something.

Note that the only appender logging in a separate thread is the
org.apache.log4j.AsyncAppender, it uses a log4j specific FIFO-queue
(org.apache.log4j.helpers.BoundedFIFO) to store the events.

 | Am I right? What is the best java collection class to use as a Queue?

This is off-topic, but a queue-like structure is easily backed up by a
suitable java.util.List implementation. You find some excellent threadsafe
structures in Doug Lea's concurrent library, see
http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.h
tml.

Also, you might want to take a look at Jakarta Commons, see
http://jakarta.apache.org/commons/index.html.

Hope this helps.

--

Thomas




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