Github user leventov commented on a diff in the pull request: https://github.com/apache/logging-log4j2/pull/71#discussion_r115512718 --- Diff: log4j-core/src/main/java/org/apache/logging/log4j/core/layout/StringBuilderEncoder.java --- @@ -32,9 +32,14 @@ public class StringBuilderEncoder implements Encoder<StringBuilder> { private static final int DEFAULT_BYTE_BUFFER_SIZE = 8 * 1024; - private final ThreadLocal<CharBuffer> charBufferThreadLocal = new ThreadLocal<>(); - private final ThreadLocal<ByteBuffer> byteBufferThreadLocal = new ThreadLocal<>(); - private final ThreadLocal<CharsetEncoder> charsetEncoderThreadLocal = new ThreadLocal<>(); + /** + * This ThreadLocal uses raw and inconvenient Object[] to store three heterogeneous objects (CharEncoder, CharBuffer --- End diff -- @jvz I can. Using just one is an optimization - ThreadLocalMap is polluted less, ThreadLocalMap.get() is called only once instead of three times.
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