From fb09f5664eb1a57dc375727ca647364ed2255573 Mon Sep 17 00:00:00 2001
From: "tomasz.kowalczewski" <tomasz.kowalczewski@gmail.com>
Date: Wed, 20 Oct 2021 23:44:56 +0200
Subject: [PATCH] Re #74: Created StringBuilders thread local holder and using
 thread local StringBuilder in Log4jAdapterLabelPrinter that can be shared
 between many threads.

---
 .../tkowalcz/tjahzi/log4j2/labels/Log4jAdapterLabelPrinter.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/log4j2-appender/src/main/java/pl/tkowalcz/tjahzi/log4j2/labels/Log4jAdapterLabelPrinter.java b/log4j2-appender/src/main/java/pl/tkowalcz/tjahzi/log4j2/labels/Log4jAdapterLabelPrinter.java
index 7912d17..e81966a 100644
--- a/log4j2-appender/src/main/java/pl/tkowalcz/tjahzi/log4j2/labels/Log4jAdapterLabelPrinter.java
+++ b/log4j2-appender/src/main/java/pl/tkowalcz/tjahzi/log4j2/labels/Log4jAdapterLabelPrinter.java
@@ -20,7 +20,7 @@ public class Log4jAdapterLabelPrinter implements LabelPrinter {
 
     @Override
     public void append(LogEvent event, Consumer<CharSequence> appendable) {
-        outputBuffer.setLength(0);
+        StringBuilder outputBuffer = StringBuilders.threadLocal();
 
         for (int i = 0; i < formatters.size(); i++) {
             formatters.get(i).format(event, outputBuffer);