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class ApiServer extends HttpApp {

  protected val design: Design = bind[Design] // ApiServerの外部で定義されているDesginを参照したい
    .bind[AtomicReference[ActorSystem]]
    .toInstance(systemReference)
    .bind[ActorSystem]
    .toInstanceProvider[AtomicReference[ActorSystem]](_.get)
  
  // snip
  

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package point

import akka.actor.{Actor, ActorRef, ActorSystem, Props}
import point.MainActor.Start
import point.Point.{Distance, DistanceResult}

import scala.concurrent.Await
import scala.concurrent.duration._

object MainActor {

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case class Room(id: Long, members: Seq[Member]) 
// このロジックはRoomが持つべき振る舞いだった場合（ドメインロジックがドメインオブジェクトの外側にある状態)
room.copy(members = room.members :+ newMember)

// ほんとは、こうしたらよいのでは
case class Room(id: Long, members: Seq[Member]) {
  def addMember(value: Member): Room = 
    copy(members = this.members :+ value)
}
room.addMember(newMember)

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package app

import cats.free._
import cats._

class DDD[ID, E] {

  def resolveBy(id: ID): Free[RepositoryDSL, Option[E]] = Free.liftF(ResolveBy(id))

  def store(id: ID, entity: E): Free[RepositoryDSL, Unit] = Free.liftF(Store(id, entity))

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package example

/**
  * 値が存在する・しないの両状態を表す型を表すトレイト。
  *
  * @tparam A 値の型
  */
sealed trait MyOption[+A] {

  /**

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import java.io._
import java.nio.charset.StandardCharsets

object LoarnMain extends App {

  def getFileBody(file: String): String =
    using(new FileInputStream(file)) { fis =>
      val text = new Array[Byte](fis.available)
      fis.read(text)
      new String(text, StandardCharsets.UTF_8)

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style = defaultWithAlign # For pretty alignment.
maxColumn = 100          # For my wide 30" display.
includeCurlyBraceInSelectChains = false
newlines.penalizeSingleSelectMultiArgList = false
project.git = true
project.excludeFilters = ["target/"]

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scala> val getTimeString = new Function0[String] {
     |    override def apply: String = ZonedDateTime.now.toString
     | }
getTimeString: () => String = <function0>

scala> :javap getTimeString
  Size 902 bytes
  MD5 checksum dc6b8c20b0a3937afbe114e129c22cb9
  Compiled from "<console>"
public class $line4.$read$$iw$$iw$$iw$$iw$

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    ├── cargo
    │   ├── Cargo.java
    │   ├── CargoRepository.java
    │   ├── Delivery.java
    │   ├── HandlingActivity.java
    │   ├── Itinerary.java
    │   ├── Leg.java
    │   ├── RouteSpecification.java
    │   ├── RoutingStatus.java

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class BankAccount {

  public void setName(String name) { 
    this.name = name;
  }
  
  public void setCustomerId(long customerId) {
    this.customerId = customerId
  }