adriancole commented on a change in pull request #2582: Reuse char[] buffer
when decoding hex fields.
URL: https://github.com/apache/incubator-zipkin/pull/2582#discussion_r283085221
##########
File path: zipkin/src/main/java/zipkin2/internal/Proto3Fields.java
##########
@@ -164,6 +164,13 @@ final int readLengthPrefix(Buffer b) {
static final char[] HEX_DIGITS =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f'};
+ // Reuse the buffer for decoding into hex since it's immediately copied
into a String.
+ static final ThreadLocal<char[]> THIRTY_TWO_CHARS = new
ThreadLocal<char[]>() {
Review comment:
Sorry for not remembering the specific nuance, but I recall us doing
something like this vs using an anonymous subclass in brave. If same to you,
mind following that vs us hunting down the conversations around it?
```java
static final ThreadLocal<char[]> CHAR_BUFFER = new ThreadLocal<>();
static char[] getCharBuffer() {
char[] charBuffer = CHAR_BUFFER.get();
if (charBuffer == null) {
charBuffer = new char[FORMAT_MAX_LENGTH];
CHAR_BUFFER.set(charBuffer);
}
return charBuffer;
}
```
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