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What are the main differences between EnhancedPatternLayout and PatternLayout?

Checking the javadoc for PatternLayout, I noticed that using EnhancedPatternLayout is recommended instead. However, it seems to be almost the same.

What are the main differences, especially those that I should know about?

I am also wondering why they made a separate class and not improved the original class. Any syntax differences?

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Check the documentation , everything is explained. EnhancedPatternLayout - An extended version of PatternLayout . It should be used instead of PatternLayout (except for the reason for compatibility with PatternLayout ).

PatternLayout contains some problems that are missing in EnhancedPatternLayout, especially with synchronization.

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EnhancedPatternLayout formats the result as a StringBuffer, while PatternLayout formats the result as a string.

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The main difference between PatternLayout and EnhancedPatternLayout is in the format () method. PatternLayout relies on a member field called sbuf , which it modifies, while EnhancedPatternLayout uses a private instance of StringBuffer. This means that calls to PatternLayout.format () are susceptible to data races during simultaneous calls, while simultaneous calls to EnhancedPatternLayout.format () are not.

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Source: https://habr.com/ru/post/909544/

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