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Renderers and Events

Renderers and Events

2003-05-26       - By Avner BenHanoch

Reply:     1     2     3     4     5  

Renderer is a class that used for rendering log-object into a String.  If
you are not registering a Renderer than log4j will simply call the
log-object's toString method.  If you send a String than log4j will simply
log that String.

Registering a Renderer should be used for classes that are often being

If your application convert the log-object into a String and send that
String to log4j debug/info/.. methods, you will have the same output.
However, using Renderers enable log4j do the rendering upon need (I.e.,
depends on the logging level).  This can save your application a lot of time
in case you have many things to log.

In addition, I think, if you use AsyncAppender, the rendering will occur in
the "background" instead of "delaying" your main threads for the time
toString consume, which can be expensive if you log a lot of things.   If
this is not accurate, please correct me.

LogEvent is a class that wraps the log-message you send to log4j.  It
contain the log-message, level, date, throwable, and maybe something else.

-- -- Original Message -- --
From: "Padmaja Manike" <padmajam@(protected)>
To: "Log4J Users List" <log4j-user@(protected)>
Sent: Monday, May 26, 2003 4:06 PM
Subject: Renderers and Events

Can anybody please explain in what context renderers and events in log4j
should be used.


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