Re: Separate log file per servlet

Ceki Gülcü Fri, 11 Jun 2004 12:08:53 -0700

Do you have control over class X? If you do, then you use a ThreadLocal variable to set the servlet name from inside the servlet and retreive the name from class X.

Assume the threadlocal variable is called TL.

This is what will happen:

  servlet1 sets the TL to "servlet1"
  servlet 1 creates an instance of X, say x1
  while constructing x1, x1 reads TL, the read value is "servlet1"
  the constructor retrieves a logger whose name depends on the value of TL
  servlet 1 calls a method on x1, say foo()
  x1.foo() logs with that logger specific to the x1
  x1.foo() eventually returns
  servlet1 eventually returns, before returning it sets TL to null

Make sense?

At 07:06 PM 6/11/2004, you wrote:

The web server is configured to be one JVM for all the servlets.
Numerous people are developing different classes. We want each
Servlet to write to its own log.

Class X
{
 ...
 xLog = getLogger( "DEBUG" );
 ...
 xLog.info( "message" );
 ...
}

Class ServletY extends HttpServlet
{
 ...
 xLog = getLogger( "DEBUG" );
 ...
 configureAndWatch( );
 ...
 xLog.info( "message" );
 ...
 someMethod()
 {
  new X();
 }
}

Class ServletZ extends HttpServlet
{
 ...
 xLog = getLogger( "DEBUG" );
 ...
 configureAndWatch( );
 ...
 xLog.info( "message" );
 ...
 someMethod()
 {
  new X();
 }
 ...
}

log4j.properties:
 ...
 Logger name="DEBUG"
 Appender A
 ...
 Appender A
 ...

Class A extends DailyRollingFileAppender
{
 String _file = null;

 a( )
 {
  super.init();
  setFile( "" );
 }

 setFile( aFile )
 {
  // Throw stack trace to figure out which servlet called you
  ...
  // add path and .log to get filename like /tmp/ServletY.log or
  // /tmp/ServletZ.log
  _file = "newFile";
 }
}

Now the problem: When the first servlet comes up, say ServletY, it
configures and creates /tmp/ServletY.log. ServletY and X write to
the file and everyone is happy. Now the next servlet comes up, say
ServletZ. It configures and creates /tmp/ServletX.log. Now
everything writes to this log but not the other.

So I guess what I am looking for is how I can I do logging on a
servlet basis that writes to a particular log. The various support
classes need to call something generic because they do not know
which specific servlet called them.

Thanks,
Adam

[EMAIL PROTECTED]

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]


--
Ceki G�lc�

For log4j documentation consider "The complete log4j manual" ISBN: 2970036908 http://www.qos.ch/shop/products/clm_t.jsp

---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]

Re: Separate log file per servlet

Reply via email to