Examples of java.util.UUID.timestamp()

java.util.UUID.timestamp()
The timestamp value associated with this UUID.
The 60 bit timestamp value is constructed from the time_low, time_mid, and time_hi fields of this UUID. The resulting timestamp is measured in 100-nanosecond units since midnight, October 15, 1582 UTC.
The timestamp value is only meaningful in a time-based UUID, which has version type 1. If this UUID is not a time-based UUID then this method throws UnsupportedOperationException. @throws UnsupportedOperationException if this UUID is not a version 1 UUID.

    public static void rectify(UUID theirVersion, InetAddress endpoint)
    {
        UUID myVersion = DatabaseDescriptor.getDefsVersion();
        if (theirVersion.timestamp() == myVersion.timestamp())
            return;
        else if (theirVersion.timestamp() > myVersion.timestamp())
        {
            logger.debug("My data definitions are old. Asking for updates since {}", myVersion.toString());
            announce(myVersion, Collections.singleton(endpoint));
        }
        else

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            // check versions at every step along the way to make sure migrations are not applied out of order.
            Collection<Column> cols = MigrationManager.makeColumns(message);
            for (Column col : cols)
            {
                final UUID version = UUIDGen.makeType1UUID(col.name());
                if (version.timestamp() > DatabaseDescriptor.getDefsVersion().timestamp())
                {
                    final Migration m = Migration.deserialize(col.value());
                    assert m.getVersion().equals(version);
                    StageManager.getStage(StageManager.MIGRATION_STAGE).submit(new WrappedRunnable()
                    {

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                    {
                        @Override
                        protected void runMayThrow() throws Exception
                        {
                            // check to make sure the current version is before this one.
                            if (DatabaseDescriptor.getDefsVersion().timestamp() == version.timestamp())
                                logger.debug("Not appling (equal) " + version.toString());
                            else if (DatabaseDescriptor.getDefsVersion().timestamp() > version.timestamp())
                                logger.debug("Not applying (before)" + version.toString());
                            else
                            {

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                        protected void runMayThrow() throws Exception
                        {
                            // check to make sure the current version is before this one.
                            if (DatabaseDescriptor.getDefsVersion().timestamp() == version.timestamp())
                                logger.debug("Not appling (equal) " + version.toString());
                            else if (DatabaseDescriptor.getDefsVersion().timestamp() > version.timestamp())
                                logger.debug("Not applying (before)" + version.toString());
                            else
                            {
                                logger.debug("Applying {} from {}", m.getClass().getSimpleName(), message.getFrom());
                                m.apply();

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        // check to see if CL.recovery modified the lastMigrationId. if it did, we need to re apply migrations. this isn't
        // the same as merely reloading the schema (which wouldn't perform file deletion after a DROP). The solution
        // is to read those migrations from disk and apply them.
        UUID currentMigration = DatabaseDescriptor.getDefsVersion();
        UUID lastMigration = Migration.getLastMigrationId();
        if ((lastMigration != null) && (lastMigration.timestamp() > currentMigration.timestamp()))
        {
            MigrationManager.applyMigrations(currentMigration, lastMigration);
        }
        
        // start server internals

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        // check to see if CL.recovery modified the lastMigrationId. if it did, we need to re apply migrations. this isn't
        // the same as merely reloading the schema (which wouldn't perform file deletion after a DROP). The solution
        // is to read those migrations from disk and apply them.
        UUID currentMigration = DatabaseDescriptor.getDefsVersion();
        UUID lastMigration = Migration.getLastMigrationId();
        if ((lastMigration != null) && (lastMigration.timestamp() > currentMigration.timestamp()))
        {
            Gossiper.instance.maybeInitializeLocalState(SystemTable.incrementAndGetGeneration());
            MigrationManager.applyMigrations(currentMigration, lastMigration);
        }

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        // check to see if CL.recovery modified the lastMigrationId. if it did, we need to re apply migrations. this isn't
        // the same as merely reloading the schema (which wouldn't perform file deletion after a DROP). The solution
        // is to read those migrations from disk and apply them.
        UUID currentMigration = DatabaseDescriptor.getDefsVersion();
        UUID lastMigration = Migration.getLastMigrationId();
        if ((lastMigration != null) && (lastMigration.timestamp() > currentMigration.timestamp()))
        {
            Gossiper.instance.maybeInitializeLocalState(SystemTable.incrementAndGetGeneration());
            MigrationManager.applyMigrations(currentMigration, lastMigration);
        }

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    @Test
    public void verifyOrdering1() throws UnknownHostException
    {
        UUID one = UUIDGen.makeType1UUIDFromHost(InetAddress.getByName("127.0.0.1"));
        UUID two = UUIDGen.makeType1UUIDFromHost(InetAddress.getByName("127.0.0.2"));
        assert one.timestamp() < two.timestamp();
    }




    @Test
    public void testDecomposeAndRaw() throws UnknownHostException

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        // check to see if CL.recovery modified the lastMigrationId. if it did, we need to re apply migrations. this isn't
        // the same as merely reloading the schema (which wouldn't perform file deletion after a DROP). The solution
        // is to read those migrations from disk and apply them.
        UUID currentMigration = DatabaseDescriptor.getDefsVersion();
        UUID lastMigration = Migration.getLastMigrationId();
        if ((lastMigration != null) && (lastMigration.timestamp() > currentMigration.timestamp()))
        {
            MigrationManager.applyMigrations(currentMigration, lastMigration);
        }
        
        SystemTable.purgeIncompatibleHints();

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