说明
用到了io.zipkin.brave包下的两个类
import brave.internal.Platform;
import brave.internal.RecyclableBuffers;
代码
import brave.internal.Platform;
import brave.internal.RecyclableBuffers;
public class TraceIdCreater {
static final char[] HEX_DIGITS = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
public static String traceIdString() {
return toTraceIdString(0, nextId());
}
private static long nextId() {
long nextId;
for(nextId = Platform.get().randomLong(); nextId == 0L; nextId = Platform.get().randomLong()) {
}
return nextId;
}
private static String toTraceIdString(long traceIdHigh, long traceId) {
if (traceIdHigh != 0) {
char[] result = RecyclableBuffers.parseBuffer();
writeHexLong(result, 0, traceIdHigh);
writeHexLong(result, 16, traceId);
return new String(result, 0, 32);
}
return toLowerHex(traceId);
}
private static String toLowerHex(long v) {
char[] data = RecyclableBuffers.parseBuffer();
writeHexLong(data, 0, v);
return new String(data, 0, 16);
}
private static void writeHexLong(char[] data, int pos, long v) {
writeHexByte(data, pos, (byte) ((v >>> 56L) & 0xff));
writeHexByte(data, pos + 2, (byte) ((v >>> 48L) & 0xff));
writeHexByte(data, pos + 4, (byte) ((v >>> 40L) & 0xff));
writeHexByte(data, pos + 6, (byte) ((v >>> 32L) & 0xff));
writeHexByte(data, pos + 8, (byte) ((v >>> 24L) & 0xff));
writeHexByte(data, pos + 10, (byte) ((v >>> 16L) & 0xff));
writeHexByte(data, pos + 12, (byte) ((v >>> 8L) & 0xff));
writeHexByte(data, pos + 14, (byte) (v & 0xff));
}
private static void writeHexByte(char[] data, int pos, byte b) {
data[pos] = HEX_DIGITS[(b >> 4) & 0xf];
data[pos + 1] = HEX_DIGITS[b & 0xf];
}
}