package org.argeo.util;
+import static java.lang.System.Logger.Level.DEBUG;
+
+import java.lang.System.Logger;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
+import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;
import java.time.Duration;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.util.BitSet;
+import java.util.Objects;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicInteger;
/**
- * Utilities to simplify and extends usage of {@link UUID}. Only the RFC 4122
- * variant (also known as Leach–Salz variant) is supported.
+ * Static utilities to simplify and extend usage of {@link UUID}. Only the RFC
+ * 4122 variant (also known as Leach–Salz variant) is supported.
+ *
+ * @see https://datatracker.ietf.org/doc/html/rfc4122
*/
public class UuidUtils {
/** Nil UUID (00000000-0000-0000-0000-000000000000). */
public final static UUID NIL_UUID = UUID.fromString("00000000-0000-0000-0000-000000000000");
+
+ /** Start of the Gregorian time, used by time-based UUID. */
public final static LocalDateTime GREGORIAN_START = LocalDateTime.of(1582, 10, 15, 0, 0, 0);
+ /**
+ * Standard DNS namespace ID for type 3 or 5 UUID (as defined in Appendix C of
+ * RFC4122).
+ */
+ public final static UUID NS_DNS = UUID.fromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8");
+ /**
+ * Standard URL namespace ID for type 3 or 5 UUID (as defined in Appendix C of
+ * RFC4122).
+ */
+ public final static UUID NS_URL = UUID.fromString("6ba7b811-9dad-11d1-80b4-00c04fd430c8");
+ /**
+ * Standard OID namespace ID (typically an LDAP type) for type 3 or 5 UUID (as
+ * defined in Appendix C of RFC4122).
+ */
+ public final static UUID NS_OID = UUID.fromString("6ba7b812-9dad-11d1-80b4-00c04fd430c8");
+ /**
+ * Standard X500 namespace ID (typically an LDAP DN) for type 3 or 5 UUID (as
+ * defined in Appendix C of RFC4122).
+ */
+ public final static UUID NS_X500 = UUID.fromString("6ba7b814-9dad-11d1-80b4-00c04fd430c8");
+
+ /*
+ * INTERNAL STATIC UTILITIES
+ */
+ private final static Logger logger = System.getLogger(UuidUtils.class.getName());
+
private final static long MOST_SIG_VERSION1 = (1l << 12);
private final static long LEAST_SIG_RFC4122_VARIANT = (1l << 63);
+ private final static int MAX_CLOCKSEQUENCE = 16384;
- private final static SecureRandom RANDOM;
- private final static AtomicInteger CLOCK_SEQUENCE;
+ private final static SecureRandom SECURE_RANDOM;
+ private final static Random UNSECURE_RANDOM;
private final static byte[] HARDWARE_ADDRESS;
+
+ private final static AtomicInteger CLOCK_SEQUENCE;
+
/** A start timestamp to which {@link System#nanoTime()}/100 can be added. */
private final static long START_TIMESTAMP;
+
static {
- RANDOM = new SecureRandom();
- CLOCK_SEQUENCE = new AtomicInteger(RANDOM.nextInt(16384));
+ SECURE_RANDOM = new SecureRandom();
+ UNSECURE_RANDOM = new Random();
+ CLOCK_SEQUENCE = new AtomicInteger(SECURE_RANDOM.nextInt(MAX_CLOCKSEQUENCE));
HARDWARE_ADDRESS = getHardwareAddress();
long nowVm = System.nanoTime() / 100;
START_TIMESTAMP = (duration.getSeconds() * 10000000 + duration.getNano() / 100) - nowVm;
}
+ /*
+ * TIME-BASED (version 1)
+ */
+
private static byte[] getHardwareAddress() {
InetAddress localHost;
try {
}
+ private synchronized static long nextClockSequence() {
+ int i = CLOCK_SEQUENCE.incrementAndGet();
+ while (i < 0 || i >= MAX_CLOCKSEQUENCE) {
+ CLOCK_SEQUENCE.set(SECURE_RANDOM.nextInt(MAX_CLOCKSEQUENCE));
+ i = CLOCK_SEQUENCE.incrementAndGet();
+ }
+ return (long) i;
+ }
+
public static UUID timeUUIDwithRandomNode() {
long timestamp = START_TIMESTAMP + System.nanoTime() / 100;
- return timeUUID(timestamp, RANDOM);
+ return timeUUID(timestamp, SECURE_RANDOM);
+ }
+
+ public static UUID timeUUIDwithUnsecureRandomNode() {
+ long timestamp = START_TIMESTAMP + System.nanoTime() / 100;
+ return timeUUID(timestamp, UNSECURE_RANDOM);
}
public static UUID timeUUID(long timestamp, Random random) {
byte[] node = new byte[6];
random.nextBytes(node);
node[0] = (byte) (node[0] | 1);
- long clockSequence = CLOCK_SEQUENCE.incrementAndGet();
+ long clockSequence = nextClockSequence();
return timeUUID(timestamp, clockSequence, node);
}
public static UUID timeUUID(long timestamp) {
if (HARDWARE_ADDRESS == null)
- return timeUUID(timestamp, RANDOM);
- long clockSequence = CLOCK_SEQUENCE.incrementAndGet();
+ return timeUUID(timestamp, SECURE_RANDOM);
+ long clockSequence = nextClockSequence();
return timeUUID(timestamp, clockSequence, HARDWARE_ADDRESS);
}
} catch (SocketException e) {
throw new IllegalStateException("Cannot get hardware address", e);
}
- long clockSequence = CLOCK_SEQUENCE.incrementAndGet();
+ long clockSequence = nextClockSequence();
return timeUUID(timestamp, clockSequence, node);
}
}
public static UUID timeUUID(long timestamp, long clockSequence, byte[] node) {
- assert node.length >= 6;
+ Objects.requireNonNull(node, "Node array cannot be null");
+ if (node.length < 6)
+ throw new IllegalArgumentException("Node array must be at least 6 bytes long");
long mostSig = MOST_SIG_VERSION1 // base for version 1 UUID
| ((timestamp & 0xFFFFFFFFL) << 32) // time_low
| ((node[3] & 0xFFL) << 24) //
| ((node[4] & 0xFFL) << 32) //
| ((node[5] & 0xFFL) << 40); //
-// for (int i = 0; i < 6; i++) {
-// leastSig = leastSig | ((node[i] & 0xFFL) << (8 * i));
-// }
UUID uuid = new UUID(mostSig, leastSig);
// tests
assert uuid.node() == BitSet.valueOf(node).toLongArray()[0];
assert uuid.timestamp() == timestamp;
- assert uuid.clockSequence() == clockSequence;
+ assert uuid.clockSequence() == clockSequence
+ : "uuid.clockSequence()=" + uuid.clockSequence() + " clockSequence=" + clockSequence;
assert uuid.version() == 1;
assert uuid.variant() == 2;
return uuid;
}
- @Deprecated
- public static UUID timeBasedUUID() {
- return timeBasedUUID(LocalDateTime.now(ZoneOffset.UTC));
+// @Deprecated
+// public static UUID timeBasedUUID() {
+// return timeBasedUUID(LocalDateTime.now(ZoneOffset.UTC));
+// }
+//
+// @Deprecated
+// public static UUID timeBasedRandomUUID() {
+// return timeBasedRandomUUID(LocalDateTime.now(ZoneOffset.UTC), RANDOM);
+// }
+//
+// @Deprecated
+// public static UUID timeBasedUUID(LocalDateTime time) {
+// if (HARDWARE_ADDRESS == null)
+// return timeBasedRandomUUID(time, RANDOM);
+// return timeBasedUUID(time, BitSet.valueOf(HARDWARE_ADDRESS));
+// }
+//
+// @Deprecated
+// public static UUID timeBasedAddressUUID(LocalDateTime time, NetworkInterface nic) throws SocketException {
+// byte[] nodeBytes = nic.getHardwareAddress();
+// BitSet node = BitSet.valueOf(nodeBytes);
+// return timeBasedUUID(time, node);
+// }
+//
+// @Deprecated
+// public static UUID timeBasedRandomUUID(LocalDateTime time, Random random) {
+// byte[] nodeBytes = new byte[6];
+// random.nextBytes(nodeBytes);
+// BitSet node = BitSet.valueOf(nodeBytes);
+// // set random marker
+// node.set(0, true);
+// return timeBasedUUID(time, node);
+// }
+//
+// @Deprecated
+// public static UUID timeBasedUUID(LocalDateTime time, BitSet node) {
+// // most significant
+// Duration duration = Duration.between(GREGORIAN_START, time);
+//
+// // Number of 100 ns intervals in one second: 1000000000 / 100 = 10000000
+// long timeNanos = duration.getSeconds() * 10000000 + duration.getNano() / 100;
+// BitSet timeBits = BitSet.valueOf(new long[] { timeNanos });
+// assert timeBits.length() <= 60;
+//
+// int clockSequence;
+// synchronized (CLOCK_SEQUENCE) {
+// clockSequence = CLOCK_SEQUENCE.incrementAndGet();
+// if (clockSequence > 16384)
+// CLOCK_SEQUENCE.set(0);
+// }
+// BitSet clockSequenceBits = BitSet.valueOf(new long[] { clockSequence });
+//
+// // Build the UUID, bit by bit
+// // see https://tools.ietf.org/html/rfc4122#section-4.2.2
+// // time
+// BitSet time_low = new BitSet(32);
+// BitSet time_mid = new BitSet(16);
+// BitSet time_hi_and_version = new BitSet(16);
+//
+// for (int i = 0; i < 60; i++) {
+// if (i < 32)
+// time_low.set(i, timeBits.get(i));
+// else if (i < 48)
+// time_mid.set(i - 32, timeBits.get(i));
+// else
+// time_hi_and_version.set(i - 48, timeBits.get(i));
+// }
+// // version
+// time_hi_and_version.set(12, true);
+// time_hi_and_version.set(13, false);
+// time_hi_and_version.set(14, false);
+// time_hi_and_version.set(15, false);
+//
+// // clock sequence
+// BitSet clk_seq_hi_res = new BitSet(8);
+// BitSet clk_seq_low = new BitSet(8);
+// for (int i = 0; i < 8; i++) {
+// clk_seq_low.set(i, clockSequenceBits.get(i));
+// }
+// for (int i = 8; i < 14; i++) {
+// clk_seq_hi_res.set(i - 8, clockSequenceBits.get(i));
+// }
+// // variant
+// clk_seq_hi_res.set(6, false);
+// clk_seq_hi_res.set(7, true);
+//
+//// String str = toHexString(time_low.toLongArray()[0]) + "-" + toHexString(time_mid.toLongArray()[0]) + "-"
+//// + toHexString(time_hi_and_version.toLongArray()[0]) + "-"
+//// + toHexString(clock_seq_hi_and_reserved.toLongArray()[0]) + toHexString(clock_seq_low.toLongArray()[0])
+//// + "-" + toHexString(node.toLongArray()[0]);
+//// UUID uuid = UUID.fromString(str);
+//
+// BitSet uuidBits = new BitSet(128);
+// for (int i = 0; i < 128; i++) {
+// if (i < 48)
+// uuidBits.set(i, node.get(i));
+// else if (i < 56)
+// uuidBits.set(i, clk_seq_low.get(i - 48));
+// else if (i < 64)
+// uuidBits.set(i, clk_seq_hi_res.get(i - 56));
+// else if (i < 80)
+// uuidBits.set(i, time_hi_and_version.get(i - 64));
+// else if (i < 96)
+// uuidBits.set(i, time_mid.get(i - 80));
+// else
+// uuidBits.set(i, time_low.get(i - 96));
+// }
+//
+// long[] uuidLongs = uuidBits.toLongArray();
+// assert uuidLongs.length == 2;
+// UUID uuid = new UUID(uuidLongs[1], uuidLongs[0]);
+//
+// // tests
+// assert uuid.node() == node.toLongArray()[0];
+// assert uuid.timestamp() == timeNanos;
+// assert uuid.clockSequence() == clockSequence;
+// assert uuid.version() == 1;
+// assert uuid.variant() == 2;
+// return uuid;
+// }
+
+ /*
+ * NAME BASED (version 3 and 5)
+ */
+
+ public static UUID nameUUIDv5(UUID namespace, String name) {
+ Objects.requireNonNull(namespace, "Namespace cannot be null");
+ Objects.requireNonNull(name, "Name cannot be null");
+ return nameUUIDv5(namespace, name.getBytes(StandardCharsets.UTF_8));
}
- @Deprecated
- public static UUID timeBasedRandomUUID() {
- return timeBasedRandomUUID(LocalDateTime.now(ZoneOffset.UTC), RANDOM);
+ public static UUID nameUUIDv5(UUID namespace, byte[] name) {
+ byte[] bytes = DigestUtils.sha1(toBytes(namespace), name);
+ bytes[6] &= 0x0f;
+ bytes[6] |= 0x50;// v5
+ bytes[8] &= 0x3f;
+ bytes[8] |= 0x80;// variant 1
+ UUID result = fromBytes(bytes, 0);
+ return result;
}
- @Deprecated
- public static UUID timeBasedUUID(LocalDateTime time) {
- if (HARDWARE_ADDRESS == null)
- return timeBasedRandomUUID(time, RANDOM);
- return timeBasedUUID(time, BitSet.valueOf(HARDWARE_ADDRESS));
+ public static UUID nameUUIDv3(UUID namespace, String name) {
+ Objects.requireNonNull(namespace, "Namespace cannot be null");
+ Objects.requireNonNull(name, "Name cannot be null");
+ return nameUUIDv3(namespace, name.getBytes(StandardCharsets.UTF_8));
}
- @Deprecated
- public static UUID timeBasedAddressUUID(LocalDateTime time, NetworkInterface nic) throws SocketException {
- byte[] nodeBytes = nic.getHardwareAddress();
- BitSet node = BitSet.valueOf(nodeBytes);
- return timeBasedUUID(time, node);
+ public static UUID nameUUIDv3(UUID namespace, byte[] name) {
+ byte[] arr = new byte[name.length + 16];
+ copyBytes(namespace, arr, 0);
+ System.arraycopy(name, 0, arr, 16, name.length);
+ return UUID.nameUUIDFromBytes(arr);
}
- @Deprecated
- public static UUID timeBasedRandomUUID(LocalDateTime time, Random random) {
- byte[] nodeBytes = new byte[6];
- random.nextBytes(nodeBytes);
- BitSet node = BitSet.valueOf(nodeBytes);
- // set random marker
- node.set(0, true);
- return timeBasedUUID(time, node);
+ /*
+ * RANDOM v4
+ */
+ public static UUID unsecureRandomUUID() {
+ byte[] arr = new byte[16];
+ UNSECURE_RANDOM.nextBytes(arr);
+ arr[6] &= 0x0f;
+ arr[6] |= 0x40;// v4
+ arr[8] &= 0x3f;
+ arr[8] |= 0x80;// variant 1
+ return fromBytes(arr);
}
- @Deprecated
- public static UUID timeBasedUUID(LocalDateTime time, BitSet node) {
- // most significant
- Duration duration = Duration.between(GREGORIAN_START, time);
+ /*
+ * UTILITIES
+ */
+ /**
+ * Convert bytes to an UUID. Byte array must not be null and be exactly of
+ * length 16.
+ */
+ public static UUID fromBytes(byte[] data) {
+ Objects.requireNonNull(data, "Byte array must not be null");
+ if (data.length != 16)
+ throw new IllegalArgumentException("Byte array as length " + data.length);
+ return fromBytes(data, 0);
+ }
- // Number of 100 ns intervals in one second: 1000000000 / 100 = 10000000
- long timeNanos = duration.getSeconds() * 10000000 + duration.getNano() / 100;
- BitSet timeBits = BitSet.valueOf(new long[] { timeNanos });
- assert timeBits.length() <= 60;
-
- int clockSequence;
- synchronized (CLOCK_SEQUENCE) {
- clockSequence = CLOCK_SEQUENCE.incrementAndGet();
- if (clockSequence > 16384)
- CLOCK_SEQUENCE.set(0);
- }
- BitSet clockSequenceBits = BitSet.valueOf(new long[] { clockSequence });
-
- // Build the UUID, bit by bit
- // see https://tools.ietf.org/html/rfc4122#section-4.2.2
- // time
- BitSet time_low = new BitSet(32);
- BitSet time_mid = new BitSet(16);
- BitSet time_hi_and_version = new BitSet(16);
-
- for (int i = 0; i < 60; i++) {
- if (i < 32)
- time_low.set(i, timeBits.get(i));
- else if (i < 48)
- time_mid.set(i - 32, timeBits.get(i));
- else
- time_hi_and_version.set(i - 48, timeBits.get(i));
- }
- // version
- time_hi_and_version.set(12, true);
- time_hi_and_version.set(13, false);
- time_hi_and_version.set(14, false);
- time_hi_and_version.set(15, false);
-
- // clock sequence
- BitSet clk_seq_hi_res = new BitSet(8);
- BitSet clk_seq_low = new BitSet(8);
- for (int i = 0; i < 8; i++) {
- clk_seq_low.set(i, clockSequenceBits.get(i));
- }
- for (int i = 8; i < 14; i++) {
- clk_seq_hi_res.set(i - 8, clockSequenceBits.get(i));
- }
- // variant
- clk_seq_hi_res.set(6, false);
- clk_seq_hi_res.set(7, true);
-
-// String str = toHexString(time_low.toLongArray()[0]) + "-" + toHexString(time_mid.toLongArray()[0]) + "-"
-// + toHexString(time_hi_and_version.toLongArray()[0]) + "-"
-// + toHexString(clock_seq_hi_and_reserved.toLongArray()[0]) + toHexString(clock_seq_low.toLongArray()[0])
-// + "-" + toHexString(node.toLongArray()[0]);
-// UUID uuid = UUID.fromString(str);
-
- BitSet uuidBits = new BitSet(128);
- for (int i = 0; i < 128; i++) {
- if (i < 48)
- uuidBits.set(i, node.get(i));
- else if (i < 56)
- uuidBits.set(i, clk_seq_low.get(i - 48));
- else if (i < 64)
- uuidBits.set(i, clk_seq_hi_res.get(i - 56));
- else if (i < 80)
- uuidBits.set(i, time_hi_and_version.get(i - 64));
- else if (i < 96)
- uuidBits.set(i, time_mid.get(i - 80));
- else
- uuidBits.set(i, time_low.get(i - 96));
- }
+ /**
+ * Convert bytes to an UUID, starting to read the array at this offset.
+ */
+ public static UUID fromBytes(byte[] data, int offset) {
+ Objects.requireNonNull(data, "Byte array cannot be null");
+ long msb = 0;
+ long lsb = 0;
+ for (int i = offset; i < 8 + offset; i++)
+ msb = (msb << 8) | (data[i] & 0xff);
+ for (int i = 8 + offset; i < 16 + offset; i++)
+ lsb = (lsb << 8) | (data[i] & 0xff);
+ return new UUID(msb, lsb);
+ }
- long[] uuidLongs = uuidBits.toLongArray();
- assert uuidLongs.length == 2;
- UUID uuid = new UUID(uuidLongs[1], uuidLongs[0]);
+ public static byte[] toBytes(UUID uuid) {
+ Objects.requireNonNull(uuid, "UUID cannot be null");
+ long msb = uuid.getMostSignificantBits();
+ long lsb = uuid.getLeastSignificantBits();
+ return BytesUtils.toBytes(msb, lsb);
+ }
- // tests
- assert uuid.node() == node.toLongArray()[0];
- assert uuid.timestamp() == timeNanos;
- assert uuid.clockSequence() == clockSequence;
- assert uuid.version() == 1;
- assert uuid.variant() == 2;
- return uuid;
+ public static void copyBytes(UUID uuid, byte[] arr, int offset) {
+ Objects.requireNonNull(uuid, "UUID cannot be null");
+ long msb = uuid.getMostSignificantBits();
+ long lsb = uuid.getLeastSignificantBits();
+ BytesUtils.copyBytes(msb, lsb, arr, offset);
}
+ /**
+ * Converts an UUID to a binary string (list of 0 and 1), with a separator to
+ * make it more readable.
+ */
public static String toBinaryString(UUID uuid, int charsPerSegment, char separator) {
String binaryString = toBinaryString(uuid);
StringBuilder sb = new StringBuilder(128 + (128 / charsPerSegment));
return sb.toString();
}
+ /** Converts an UUID to a binary string (list of 0 and 1). */
public static String toBinaryString(UUID uuid) {
String most = zeroTo64Chars(Long.toBinaryString(uuid.getMostSignificantBits()));
String least = zeroTo64Chars(Long.toBinaryString(uuid.getLeastSignificantBits()));
return str;
}
+ /**
+ * Converts an UUID hex representation without '-' to the standard form (with
+ * '-').
+ */
public static String compactToStd(String compact) {
if (compact.length() != 32)
throw new IllegalArgumentException(
return std;
}
- public static UUID compactToUuid(String compact) {
+ /**
+ * Converts an UUID hex representation without '-' to an {@link UUID}.
+ */
+ public static UUID fromCompact(String compact) {
return UUID.fromString(compactToStd(compact));
}
-
+
+ /** To a 32 characters hex string without '-'. */
+ public static String toCompact(UUID uuid) {
+ return BytesUtils.toHexString(toBytes(uuid));
+ }
+
public static String firstBlock(UUID uuid) {
return uuid.toString().substring(0, 8);
}
private UuidUtils() {
}
- public final static void main(String[] args) throws Exception {
- UUID uuid;
+ final static void smokeTests() throws AssertionError {
+
+ // warm up a bit before measuring perf and logging it
+ int warmUpCycles = 10;
+ // int warmUpCycles = 10000000;
+ if (logger.isLoggable(DEBUG))
+ for (int i = 0; i < warmUpCycles; i++) {
+ UUID.randomUUID();
+ unsecureRandomUUID();
+ timeUUID();
+ timeUUIDwithRandomNode();
+ nameUUIDv5(NS_DNS, "example.org");
+ nameUUIDv3(NS_DNS, "example.org");
+ }
+
+ long begin;
-// uuid = compactToUuid("996b1f5122de4b2f94e49168d32f22d1");
-// System.out.println(uuid.toString() + ", isRandom=" + isRandom(uuid));
+ {
+ begin = System.nanoTime();
+ UUID uuid = UUID.randomUUID();
+ long duration = System.nanoTime() - begin;
+ assert isRandom(uuid);
+ logger.log(DEBUG, () -> uuid.toString() + " in " + duration + " ns, isRandom=" + isRandom(uuid));
+ }
- // warm up before measuring perf
- for (int i = 0; i < 10; i++) {
- UUID.randomUUID();
- timeUUID();
- timeUUIDwithRandomNode();
- timeBasedRandomUUID();
- timeBasedUUID();
+ {
+ begin = System.nanoTime();
+ UUID uuid = unsecureRandomUUID();
+ long duration = System.nanoTime() - begin;
+ assert isRandom(uuid);
+ logger.log(DEBUG, () -> uuid.toString() + " in " + duration + " ns, isRandom=" + isRandom(uuid));
}
- long begin;
- long duration;
-
- begin = System.nanoTime();
- uuid = UUID.randomUUID();
- duration = System.nanoTime() - begin;
- System.out.println(uuid.toString() + " in " + duration + " ns, isRandom=" + isRandom(uuid));
-
- begin = System.nanoTime();
- uuid = timeUUID();
- duration = System.nanoTime() - begin;
- System.out.println(uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
-
- begin = System.nanoTime();
- uuid = timeUUIDwithRandomNode();
- duration = System.nanoTime() - begin;
- System.out.println(uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
-
- begin = System.nanoTime();
- uuid = timeBasedUUID();
- duration = System.nanoTime() - begin;
- System.out.println(uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
-
- begin = System.nanoTime();
- uuid = timeBasedRandomUUID();
- duration = System.nanoTime() - begin;
- System.out.println(uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
-// System.out.println(toBinaryString(uuid, 8, ' '));
-// System.out.println(toBinaryString(uuid, 16, '\n'));
+ {
+ begin = System.nanoTime();
+ UUID uuid = timeUUID();
+ long duration = System.nanoTime() - begin;
+ assert isTimeBased(uuid);
+ logger.log(DEBUG,
+ () -> uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
+ }
+
+ {
+ begin = System.nanoTime();
+ UUID uuid = timeUUIDwithRandomNode();
+ long duration = System.nanoTime() - begin;
+ assert isTimeBasedRandom(uuid);
+ logger.log(DEBUG,
+ () -> uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
+ }
+
+ {
+ begin = System.nanoTime();
+ UUID uuid = nameUUIDv5(NS_DNS, "example.org");
+ long duration = System.nanoTime() - begin;
+ assert isNameBased(uuid);
+ // uuidgen --sha1 --namespace @dns --name example.org
+ assert "aad03681-8b63-5304-89e0-8ca8f49461b5".equals(uuid.toString());
+ logger.log(DEBUG, () -> uuid.toString() + " in " + duration + " ns, isNameBased=" + isNameBased(uuid));
+ }
+
+ {
+ begin = System.nanoTime();
+ UUID uuid = nameUUIDv3(NS_DNS, "example.org");
+ long duration = System.nanoTime() - begin;
+ assert isNameBased(uuid);
+ // uuidgen --md5 --namespace @dns --name example.org
+ assert "04738bdf-b25a-3829-a801-b21a1d25095b".equals(uuid.toString());
+ logger.log(DEBUG, () -> uuid.toString() + " in " + duration + " ns, isNameBased=" + isNameBased(uuid));
+ }
+ }
+
+ public static void main(String[] args) {
+ smokeTests();
}
}
projects / lgpl / argeo-commons.git / commitdiff