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https://issues.apache.org/jira/browse/LOG4J2-1719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma closed LOG4J2-1719.
-------------------------------
Resolution: Fixed
Fixed in master in commit 3d87ed7.
> StringBuilderFormattable Messages should used cached formatted message if it
> exists
> -----------------------------------------------------------------------------------
>
> Key: LOG4J2-1719
> URL: https://issues.apache.org/jira/browse/LOG4J2-1719
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.7
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.8
>
>
> When logging asynchronously, {{Message::getFormattedMessage}} is called to
> give Message implementations a chance to take a snapshot of mutable objects
> before the message is passed to another thread. (See LOG4J2-763, LOG4J2-1718.
> Exceptions are Messages implementing ReusableMessage or
> AsynchronouslyFormattable.)
> Some Messages implement StringBuilderFormattable to avoid creating temporary
> objects in the Layout.
> The StringBuilderFormattable::formatTo(StringBuilder) method should be
> implemented such that it first checks if a cached formatted message string
> exists. If so, this string should be appended to the StringBuilder. If no
> cached message string exists logging is done synchronously and the formatted
> message can safely be created afresh.
> This bug exists in:
> * ObjectMessage
> * SimpleMessage
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