AI BriefingHow to Avoid Unnecessary String Operations When Logging in Kotlin
Key point
Logging with Kotlin's string templates causes unnecessary operations, so Parameterized Logging should be used to optimize performance.
Details
SLF4J is a facade that abstracts various logging libraries to provide a consistent interface. In a Java environment, using the + operator when writing logs causes String Concatenation and String.valueOf() calls to occur even when the log level is disabled, resulting in unnecessary performance degradation.
To prevent this, the Parameterized Logging approach using {} placeholders is recommended. This approach only substitutes values when the log level is enabled, and according to the official SLF4J documentation, it shows at least 30x higher performance than the existing approach.
The same applies to the Kotlin environment. The intuitive String Template ($) offers good readability, but internally it goes through a .toString() and string concatenation process, so the operation is performed regardless of the log level. Therefore, in Kotlin as well, Parameterized Logging or the kotlin-logging library should be used to avoid unnecessary operations and optimize performance.
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