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From "Scott Deboy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LOG4J2-13) Appenders, layouts, etc should support deferred processing
Date Mon, 23 Jun 2008 03:00:44 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607135#action_12607135
] 

Scott Deboy commented on LOG4J2-13:
-----------------------------------

Related to layouts and LoggingEvent:

In log4j 1.x, layouts were able to change the LoggingEvent fields (one example is if the appender's
layout specified locationInformation).  As a result, all following appenders contained this
information, while appenders configured before this appender didn't contain locationInfo.

We should avoid this side effect of a layout changing LoggingEvent state in Log4j 2.

> Appenders, layouts, etc should support deferred processing
> ----------------------------------------------------------
>
>                 Key: LOG4J2-13
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-13
>             Project: Log4j 2
>          Issue Type: Wish
>            Reporter: Curt Arnold
>
> Appenders, Layouts and the like that interact with LoggingEvent should support deferred
processing.  
> This can be accomplished by having a distinct extract() method where the object constructs
a value object containing the info needed for later processing from the LoggingEvent and other
context (such as current thread, stack trace).  At some later time, this value object may
be rendered to complete the layout etc.  This approach eliminates the need to preemptively
collect information such as stack trace that may not be used or to clone the LoggingEvent
to isolate the layout or appender from external changes.

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