Log4J architecture - AsyncAppender

["Frissaer, Jeroen" <je...@be.unisys.com>]

Hi everyone,

I would like to know more about how Log4J is architectured.  More in
particular the use of the AsyncAppender within a J2EE environment.  Suppose
I'v got 3 EJB's: EJB1, EJB2 and EJB3 that create loggers with names:
TraceLogger.EJB1, TraceLogger.EJB2 and TraceLogger.EJB3.

Logger creation and configuration is done in a central class that first
checks if configuration needs to be done or not.  My TraceLogger logger uses
an AsyncAppender that references for example a JMSAppender and a
SocketAppender.

What I would like to know is: How many extra threads are there created by
the use of the AsyncAppender.  One that serves everything?  one for each EJB
that logs?


Thanks
Jeroen

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RE: Log4J architecture - AsyncAppender

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

The AsyncAppender documentation reads

"(..) The AsyncAppender uses a separate thread to serve the events in
 its bounded buffer (...)"

Reading the code confirms this statement (surprisingly enough). A thread is
started upon creation, and the thread is notified each time a log event
occurs, which is then distributed to the appenders the asyncappender in
question is controlling.

Hope this helps.

--

Thomas




| -----Original Message-----
| From: Frissaer, Jeroen [mailto:jeroen.frissaer@be.unisys.com]
| Sent: 10 June 2002 09:11
| To: Log4j Mailing List (E-mail)
| Subject: Log4J architecture - AsyncAppender
|
|
| Hi everyone,
|
| I would like to know more about how Log4J is architectured.  More in
| particular the use of the AsyncAppender within a J2EE
| environment.  Suppose
| I'v got 3 EJB's: EJB1, EJB2 and EJB3 that create loggers with names:
| TraceLogger.EJB1, TraceLogger.EJB2 and TraceLogger.EJB3.
|
| Logger creation and configuration is done in a central class that first
| checks if configuration needs to be done or not.  My TraceLogger
| logger uses
| an AsyncAppender that references for example a JMSAppender and a
| SocketAppender.
|
| What I would like to know is: How many extra threads are there created by
| the use of the AsyncAppender.  One that serves everything?  one
| for each EJB
| that logs?
|
|
| Thanks
| Jeroen
|
| --
| To unsubscribe, e-mail:
<ma...@jakarta.apache.org>
For additional commands, e-mail: <ma...@jakarta.apache.org>




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