povilas

case class Rectangle(width: Double, height: Double)
case class Square(radius: Double)
case class Triangle(side: Double)

trait Area[A] {
  def area(shape: A): Double
}

object Area {
  def apply[A: Area]: Area[A] = implicitly[Area[A]]

povilas

@startuml

Scheduler --> Updater: do your job
Updater -> EmailQueue: get next email for update
EmailQueue --> EmailMeta: sync
EmailMeta -> CandidateList: emails that I don't have
EmailMeta <- CandidateList: emails
EmailMeta <- EmailMeta: update myself
EmailQueue -> EmailMeta: filter by some logic
EmailQueue <- EmailMeta: email