adriancole commented on a change in pull request #2591: Let Java copy arrays
which it can sometimes do faster than manual loops.
URL: https://github.com/apache/incubator-zipkin/pull/2591#discussion_r283657086
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File path: zipkin/src/main/java/zipkin2/Span.java
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@@ -659,11 +659,21 @@ public static String normalizeTraceId(String traceId) {
}
}
+ static final String THIRTY_TWO_ZEROS;
+ static {
+ char[] zeros = new char[32];
+ Arrays.fill(zeros, '0');
+ THIRTY_TWO_ZEROS = new String(zeros);
+ }
+
static String padLeft(String id, int desiredLength) {
+ int length = id.length();
+ int numZeros = desiredLength - length;
+
char[] data = Platform.shortStringBuffer();
- int i = 0, length = id.length(), offset = desiredLength - length;
- for (; i < offset; i++) data[i] = '0';
- for (int j = 0; j < length; j++) data[i++] = id.charAt(j);
+ THIRTY_TWO_ZEROS.getChars(0, numZeros, data, 0);
+ id.getChars(0, length, data, numZeros);
Review comment:
heh never knew about this method before. nice one!
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