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https://issues.apache.org/jira/browse/LOG4J2-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222820#comment-15222820
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Greg Thomas commented on LOG4J2-1348:
-------------------------------------
On Creation, the CloseableThreadContext backs up the values of any existing
keys it's about to overwrite then, and then restores them back to their
original value when it's closed.
> AutoCloseable ThreadContext access
> ----------------------------------
>
> Key: LOG4J2-1348
> URL: https://issues.apache.org/jira/browse/LOG4J2-1348
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Affects Versions: 2.5
> Reporter: Greg Thomas
> Priority: Minor
>
> The log4j2 API provides a ThreadContext -
> https://logging.apache.org/log4j/2.x/manual/thread-context.html - that
> allows items to be added to a stack or a map for logging, and then
> subsequently removed once they are no longer required.
> This sounds like an ideal candidate for a AutoCloseable implementation so
> that items are removed automatically and no longer left around littering the
> stack/map.
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