Monadic Either

inserts.scala

type Id = Int
def insertA():Either[Exception, Id] = {println("running A"); Right(1)}
def insertB(a: Id):Either[Exception, Id] = {println("running B with " + a); Left(new Exception("Oops"))}
def insertC(b: Id):Either[Exception, Id] = {println("running C with " + b); Right(3)}

for {
   a <- insertA().right
   b <- insertB(a).right
   c <- insertC(b).right
} yield {
 c
}