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From "Ebersole, Steven" <steven.ebers...@vignette.com>
Subject RE: MDC in J2EE environment
Date Thu, 03 Apr 2003 15:13:30 GMT
Yeah, that's what I was afraid of having to do.

I think I'll try just never clearing the MDC and see if that affects memory
really badly...

    |-----Original Message-----
    |From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
    |Sent: Thursday, April 03, 2003 8:22 AM
    |To: Log4J Users List
    |Subject: RE: MDC in J2EE environment
    |My convention with MDC and NDC has been for each method to 
    |just worry
    |about its own logging.  For example:
    |In SessionBeanA:
    |public void executeUseCase()
    |  // Put whatever you want into MDC
    |  // Log entry into SessionBeanA::executeUseCase
    |  ...
    |  // Call SessionBeanB::executeUseCaseB()
    |  ...
    |  // If you have more logging statements here,
    |  // need to re-populate MDC.
    |In SessionBeanB:
    |public void executeUseCaseB()
    |  // Put whatever you want into MDC
    |  // Log entry into SessionBeanB:executeUseCaseB()
    |  ...
    |But the above may simply be my approach because I haven't 
    |had time to
    |think of a better one.  I also assume that populating an 
    |MDC is a very
    |cheap operation: O(1) hash entries.
    |Yoav Shapira
    |Millennium ChemInformatics
    |>-----Original Message-----
    |>From: Ebersole, Steven [mailto:steven.ebersole@vignette.com]
    |>Sent: Thursday, April 03, 2003 9:13 AM
    |>To: Log4j user list (E-mail)
    |>Subject: MDC in J2EE environment
    |>There is certain information which is thread contextual 
    |which I would
    |>to include into log4j's MDC to be available for logging.  
    |One of these,
    |>example, is the currently executing user.  My 
    |architecture is such that
    |>requests come through a layer of stateless session EJBs.  
    |Now these
    |>make calls into other session EJBs in order to fulfill 
    |their use-case:
    |>public class SessionBeanA
    |>    ...
    |>    public void executeUseCase()
    |>    {
    |>        ... // Do some work
    |>        SessionBeanB sessionBeanB = ...; // Lookup SessionBeanB
    |>        sessionBeanB.executeSomeRelatedUseCase();
    |>        ... // Do some more work
    |>    }
    |>public class SessionBeanB
    |>    ...
    |>    public void executeRelatedUseCase()
    |>    {
    |>        ... // Do something
    |>    }
    |>The typical usage of MDC seems to be:
    |>1) put vars into MDC
    |>2) do your work
    |>3) clean up MDC
    |>But if I apply this usage to the scenario above, when
    |>SessionBeanB.executeRelatedUseCase() cleans up the MDC, 
    |the information
    |>would no longer be contained in the MDC for LoggingEvents 
    |>the "Do some more work" section of SessionBeanA.executeUseCase().
    |>I run weblogic 6.1, which unfortunately does not have 
    |support for "call
    |>interceptors" to know when a user context has been bound 
    |to a thread.
    |>Otherwise, I could simply setup MDC when a "session" is 
    |begun and clean
    |>the MDC when the session ends.  The only way around this 
    |I have been
    |>think of is to just always call MDC.put( "USER",
    |>mySessionContext.getCallerPrincipal().getName() ) at the 
    |beginning of
    |>and every session bean method.  But I would not ever be 
    |able to clean
    |>MDC because of this nesting described above.
    |>Is this OK?  Or this there a better way to do this?
    |>Steve Ebersole
    |>IT Integration Engineer
    |>Vignette Corporation
    |>Office: 512.741.4195
    |>Mobile: 512.297.5438
    |>Visit http://www.vignette.com
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