Bind.scala

import wvlet.airframe._

// Read configurations from a YAML file
val yaml = readConfig("config.yml") 
// Configure Application
val d = newDesign
  .bind[ServiceConfig].toInstance(new ServiceConfig(yaml.get(...), yaml.get(..))
  .bind[WebAppConfig].toInstance(new WebAppConfig(...))

// Initialize Services
d.build[WebApp]{ webApp =>
  // new WebApp(session.get[WebAppConfig], session.get[WebComponent]) will be called
  // new WebComponent(session.get[Service]) will be called
  // new Service(session.get[ServiceConfig]) will be called
}