Remko Popma created LOG4J2-1719:
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Summary: 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
* ThreadDumpMessage
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