uid use is very simple. You define the structure of the ids via a Scheme and then you generate ids via a Generator. You can choose to generate ids as Longs or use the Id type of the library.
import gr.jkl.uid.{ Scheme, Generator }
// Define the Id specification with the following parameters:
// timestamp: 42 bits
// node : 12 bits
// sequence : 10 bits
// epoch : 1351728000000L (01 Nov 2012 00:00:00 GMT)
implicit val scheme = Scheme(42, 12, 10, 1351728000000L)
// Construct an Id Generator for a machine with id 0
val generator = Generator(0L)
// Create a new Id
val id = generator.newId
// Create a new Id as a Long
val longId = generator.newLong