rgoers commented on a change in pull request #289: LOG4J2-2644 - Improve 
performance of getting location info
URL: https://github.com/apache/logging-log4j2/pull/289#discussion_r299077682
 
 

 ##########
 File path: 
log4j-api-java9/src/main/java/org/apache/logging/log4j/util/StackLocator.java
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 @@ -31,6 +33,7 @@
 
     private final static StackLocator INSTANCE = new StackLocator();
 
+    private final static ThreadLocal<FqcnCallerLocator> LOCATOR = 
ThreadLocal.withInitial(FqcnCallerLocator::new);
 
 Review comment:
   What do you mean - "check if threadlocals are enabled"? A ThreadLocal is a 
standard Java class...

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