net.snowflake.client.core.UUIDUtils Maven / Gradle / Ivy
package net.snowflake.client.core;
import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;
public class UUIDUtils {
static Boolean newUUIDEnabled = true;
public static UUID getUUID() {
if (UUIDUtils.newUUIDEnabled) {
return UUIDUtils.UUIDImpl();
} else {
return UUID.randomUUID();
}
}
private static UUID UUIDImpl() {
final byte[] randomBytes = new byte[16];
ThreadLocalRandom.current().nextBytes(randomBytes);
randomBytes[6] &= 0x0f;
randomBytes[6] |= 0x40;
randomBytes[8] &= 0x3f;
randomBytes[8] |= 0x80;
long msb = 0;
long lsb = 0;
for (int i = 0; i < 8; i++) msb = (msb << 8) | (randomBytes[i] & 0xff);
for (int i = 8; i < 16; i++) lsb = (lsb << 8) | (randomBytes[i] & 0xff);
return new UUID(msb, lsb);
}
}