logger mixin

gistfile1.scala

abstract class BizService {
   def doIt()
}

class Worker extends BizService {
  def doIt() {println("I am working")}
}

trait Logger extends BizService {
  abstract override def doIt() {println("logMe first");super.doIt()}
}

-------------------------------------------
scala> val worker = new Worker
worker: Worker = Worker@776f06f8

scala> worker.doIt()
I am working

scala> val loggedWorker = new Worker with Logger
loggedWorker: Worker with Logger = $anon$1@4847c707

scala> loggedWorker.doIt()
logMe first
I am working