ServiceCompose.scala

// New Services
class WebApp(webAppConfig:WebAppConfig, component:WebComponent)
class WebComponent(service:Service)

// Pack configuration set in a class
case class ConfigSet(serviceConfig:ServiceConfig, webAppConfig:WebAppConfig)

// Read configurations from a YAML file
def readConfig: ConfigSet = {
  val yaml = readConfig("config.yml") 
  val serviceConfig = new ServiceConfig(yaml.get(...), yaml.get(..))
  val webAppConfig = new WebAppConfig(...)
  ConfigSet(serviceConfig, webAppConfig)
}

// Initialize services
val configSet = readConfig
val service = new Service(configSet.serviceConfig)
val webComponent = new WebComponent(service)
val webApp = new WebApp(configSet.webAppConfig, webComponent)