[logback-dev] [JIRA] Commented: (LBCLASSIC-275) LoggingEvent casts to LogbackMDCAdapter without checking

[Chris Dolan (JIRA)]

    [ http://jira.qos.ch/browse/LBCLASSIC-275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12034#action_12034 ] 

Chris Dolan commented on LBCLASSIC-275:
---------------------------------------

Since 0.9.29 was just released, I studied http://jira.qos.ch/browse/LBCLASSIC-254 (Performance improvement for LogbackMDCAdapter) in the context of my proposed fix. I believe my fix still works because there should not be any changes to MDC until *either* prepareForDeferredProcessing() or getMDCPropertyMap() is called. I just issued a pull request for this change:
 https://github.com/chrisdolan/logback/commit/2ac4ee863fc4d3c74439a91a0d327e2aaf93543a

> LoggingEvent casts to LogbackMDCAdapter without checking
> --------------------------------------------------------
>
>                 Key: LBCLASSIC-275
>                 URL: http://jira.qos.ch/browse/LBCLASSIC-275
>             Project: logback-classic
>          Issue Type: Bug
>    Affects Versions: 0.9.28
>            Reporter: Chris Dolan
>            Assignee: Ceki Gulcu
>
> LoggingEvent has this code:
>     // ugly but under the circumstances acceptable
>     LogbackMDCAdapter logbackMDCAdapter = (LogbackMDCAdapter) MDC
>         .getMDCAdapter();
>     mdcPropertyMap = logbackMDCAdapter.getPropertyMap();
> I'm trying to build a logback implementation of the OSGi pax-logging-service (http://www.ops4j.org/projects/pax/logging/index.html). But I've got a problem that PAX exports org.slf4j.impl with their own MDC adapter that fails this cast. Theirs has the nice feature that the OSGi bundle context is automatically added to the MDC (at a performance cost, alas).  I'd like to see LoggingEvent changed to something like the following for improved flexibility:
>    MDCAdapter mdc = MDC.getMDCAdapter();
>    if (MDCAdaptor instanceof LogbackMDCAdapter)
>        mdcPropertyMap = ((LogbackMDCAdapter)mdc).getPropertyMap();
>    else
>        mdcPropertyMap = mdc.getCopyOfContextMap();

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