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From "Roy Chastain (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4NET-316) Provide a Layout Pattern that is re-evaluated on each use
Date Tue, 06 Dec 2011 15:35:39 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163649#comment-13163649
] 

Roy Chastain commented on LOG4NET-316:
--------------------------------------

Given my somewhat limited knowledge of the log4Net code base and internal design, the sub-classing
seemed like a simple and clean implementation.  It allows for new functionality without adding
logic the the PattenLayout base class and therefore minimizes the chance of breaking the existing
implementation.

So, yes other than the fact that I have created a very small class and added to class proliferation,
I am happy with the sub-classing.
                
> Provide a Layout Pattern that is re-evaluated on each use
> ---------------------------------------------------------
>
>                 Key: LOG4NET-316
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-316
>             Project: Log4net
>          Issue Type: Improvement
>          Components: Other
>    Affects Versions: 1.2.11
>            Reporter: Roy Chastain
>            Priority: Minor
>              Labels: features
>         Attachments: DynamicPatternLayout.cs
>
>
> The DynamicPatternLayout is a layout pattern that is re-evaluated on each use.  It is
appropriate to use instead of LayoutPattern to provide dynamic strings in headers and footers
for appenders.  Datetime is an example.  Using the standard layout pattern results in the
same datetime in each header and footer, while using DynamicPatternLayout results in timestamp
of the header/footer creation.
> Example
> <layout type="log4net.Layout.DynamicPatternLayout">
>   <param name="Header" value="%newline**** Trace Opened     Local: %date{yyyy-MM-dd
HH:mm:ss.fff}     UTC: %utcdate{yyyy-MM-dd HH:mm:ss.fff} ****%newline"/>
>   <param name="Footer" value="**** Trace Closed %date{yyyy-MM-dd HH:mm:ss.fff} ****%newline"/>
> </layout>

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