+++ /dev/null
-package org.argeo.util;
-
-import java.net.InetAddress;
-import java.net.NetworkInterface;
-import java.net.SocketException;
-import java.net.UnknownHostException;
-import java.security.SecureRandom;
-import java.time.Duration;
-import java.time.LocalDateTime;
-import java.time.ZoneOffset;
-import java.util.BitSet;
-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.
- */
-public class UuidUtils {
- /** Nil UUID (00000000-0000-0000-0000-000000000000). */
- public final static UUID NIL_UUID = UUID.fromString("00000000-0000-0000-0000-000000000000");
- public final static LocalDateTime GREGORIAN_START = LocalDateTime.of(1582, 10, 15, 0, 0, 0);
-
- private final static long MOST_SIG_VERSION1 = (1l << 12);
- private final static long LEAST_SIG_RFC4122_VARIANT = (1l << 63);
-
- private final static SecureRandom RANDOM;
- private final static AtomicInteger CLOCK_SEQUENCE;
- private final static byte[] HARDWARE_ADDRESS;
- /** 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));
- HARDWARE_ADDRESS = getHardwareAddress();
-
- long nowVm = System.nanoTime() / 100;
- Duration duration = Duration.between(GREGORIAN_START, LocalDateTime.now(ZoneOffset.UTC));
- START_TIMESTAMP = (duration.getSeconds() * 10000000 + duration.getNano() / 100) - nowVm;
- }
-
- private static byte[] getHardwareAddress() {
- InetAddress localHost;
- try {
- localHost = InetAddress.getLocalHost();
- try {
- NetworkInterface nic = NetworkInterface.getByInetAddress(localHost);
- return nic.getHardwareAddress();
- } catch (SocketException e) {
- return null;
- }
- } catch (UnknownHostException e) {
- return null;
- }
-
- }
-
- public static UUID timeUUIDwithRandomNode() {
- long timestamp = START_TIMESTAMP + System.nanoTime() / 100;
- return timeUUID(timestamp, 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();
- return timeUUID(timestamp, clockSequence, node);
- }
-
- public static UUID timeUUID() {
- long timestamp = START_TIMESTAMP + System.nanoTime() / 100;
- return timeUUID(timestamp);
- }
-
- public static UUID timeUUID(long timestamp) {
- if (HARDWARE_ADDRESS == null)
- return timeUUID(timestamp, RANDOM);
- long clockSequence = CLOCK_SEQUENCE.incrementAndGet();
- return timeUUID(timestamp, clockSequence, HARDWARE_ADDRESS);
- }
-
- public static UUID timeUUID(long timestamp, NetworkInterface nic) {
- byte[] node;
- try {
- node = nic.getHardwareAddress();
- } catch (SocketException e) {
- throw new IllegalStateException("Cannot get hardware address", e);
- }
- long clockSequence = CLOCK_SEQUENCE.incrementAndGet();
- return timeUUID(timestamp, clockSequence, node);
- }
-
- public static UUID timeUUID(LocalDateTime time, long clockSequence, byte[] node) {
- Duration duration = Duration.between(GREGORIAN_START, time);
- // Number of 100 ns intervals in one second: 1000000000 / 100 = 10000000
- long timestamp = duration.getSeconds() * 10000000 + duration.getNano() / 100;
- return timeUUID(timestamp, clockSequence, node);
- }
-
- public static UUID timeUUID(long timestamp, long clockSequence, byte[] node) {
- assert node.length >= 6;
-
- long mostSig = MOST_SIG_VERSION1 // base for version 1 UUID
- | ((timestamp & 0xFFFFFFFFL) << 32) // time_low
- | (((timestamp >> 32) & 0xFFFFL) << 16) // time_mid
- | ((timestamp >> 48) & 0x0FFFL);// time_hi_and_version
-
- long leastSig = LEAST_SIG_RFC4122_VARIANT // base for Leach–Salz UUID
- | (((clockSequence & 0x3F00) >> 8) << 56) // clk_seq_hi_res
- | ((clockSequence & 0xFF) << 48) // clk_seq_low
- | (node[0] & 0xFFL) //
- | ((node[1] & 0xFFL) << 8) //
- | ((node[2] & 0xFFL) << 16) //
- | ((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.version() == 1;
- assert uuid.variant() == 2;
- return uuid;
- }
-
- @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;
- }
-
- public static String toBinaryString(UUID uuid, int charsPerSegment, char separator) {
- String binaryString = toBinaryString(uuid);
- StringBuilder sb = new StringBuilder(128 + (128 / charsPerSegment));
- for (int i = 0; i < binaryString.length(); i++) {
- if (i != 0 && i % charsPerSegment == 0)
- sb.append(separator);
- sb.append(binaryString.charAt(i));
- }
- return sb.toString();
- }
-
- public static String toBinaryString(UUID uuid) {
- String most = zeroTo64Chars(Long.toBinaryString(uuid.getMostSignificantBits()));
- String least = zeroTo64Chars(Long.toBinaryString(uuid.getLeastSignificantBits()));
- String binaryString = most + least;
- assert binaryString.length() == 128;
- return binaryString;
- }
-
- private static String zeroTo64Chars(String str) {
- assert str.length() <= 64;
- if (str.length() < 64) {
- StringBuilder sb = new StringBuilder(64);
- for (int i = 0; i < 64 - str.length(); i++)
- sb.append('0');
- sb.append(str);
- return sb.toString();
- } else
- return str;
- }
-
- public static String compactToStd(String compact) {
- if (compact.length() != 32)
- throw new IllegalArgumentException(
- "Compact UUID '" + compact + "' has length " + compact.length() + " and not 32.");
- StringBuilder sb = new StringBuilder(36);
- for (int i = 0; i < 32; i++) {
- if (i == 8 || i == 12 || i == 16 || i == 20)
- sb.append('-');
- sb.append(compact.charAt(i));
- }
- String std = sb.toString();
- assert std.length() == 36;
- assert UUID.fromString(std).toString().equals(std);
- return std;
- }
-
- public static UUID compactToUuid(String compact) {
- return UUID.fromString(compactToStd(compact));
- }
-
- public static String firstBlock(UUID uuid) {
- return uuid.toString().substring(0, 8);
- }
-
- public static boolean isRandom(UUID uuid) {
- return uuid.version() == 4;
- }
-
- public static boolean isTimeBased(UUID uuid) {
- return uuid.version() == 1;
- }
-
- public static boolean isTimeBasedRandom(UUID uuid) {
- if (uuid.version() == 1) {
- BitSet node = BitSet.valueOf(new long[] { uuid.node() });
- return node.get(0);
- } else
- return false;
- }
-
- public static boolean isNameBased(UUID uuid) {
- return uuid.version() == 3 || uuid.version() == 5;
- }
-
- /** Singleton. */
- private UuidUtils() {
- }
-
- public final static void main(String[] args) throws Exception {
- UUID uuid;
-
-// uuid = compactToUuid("996b1f5122de4b2f94e49168d32f22d1");
-// System.out.println(uuid.toString() + ", isRandom=" + isRandom(uuid));
-
- // warm up before measuring perf
- for (int i = 0; i < 10; i++) {
- UUID.randomUUID();
- timeUUID();
- timeUUIDwithRandomNode();
- timeBasedRandomUUID();
- timeBasedUUID();
- }
-
- 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'));
- }
-}
projects / lgpl / argeo-commons.git / blobdiff