rocketraman commented on a change in pull request #19:
URL: 
https://github.com/apache/logging-log4j-kotlin/pull/19#discussion_r629518466



##########
File path: 
log4j-api-kotlin/src/main/kotlin/org/apache/logging/log4j/kotlin/LoggingFactory.kt
##########
@@ -75,3 +81,5 @@ private fun <T : Any> unwrapCompanionClass(ofClass: 
Class<T>): Class<*> {
     ofClass
   }
 }
+
+private val loggerCache = ConcurrentHashMap<Class<*>, KotlinLogger>()

Review comment:
       Thanks for the link -- I've never actually come across this approach 
before! Doing it unsophisticated for now is probably fine -- I've committed 
7783beb. Note this is a bit slower than `ConcurrentHashMap` -- the benchmarks 
show 14.1 ns/op vs 5 ns/op, but I think its ok. Still almost an order of 
magnitude better than now!




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