Example for Blog Post "Hexagonal Architecture: Structuring a project and the influence of granularity V2

driver_ports.go

##### the coarse-grained version #####

type ForPlayingTheGame interface {
  SelectDeck(command SelectDeckCommand) error
  UnselectDeck(command UnselectDeckCommand) error
  EnrollPlayer(command EnrollPlayerCommand) error
  SignOutPlayer(command SignOutPlayerCommand) error
  PurgeInactivePlayers(command PurgeInactivePlayersCommand) (count uint, err error)
  FinishCard(command FinishCardCommand) error
  RejectCard(command RejectCardCommand) error
}


##### a coarse-grained version, but sliced into logical groups #####

type ForSelectingDecks interface {
  Select(command SelectDeckCommand) error
  Unselect(command UnselectDeckCommand) error
}

type ForEnrollingPlayers interface {
  EnrollPlayer(command EnrollPlayerCommand) error
  SignOutPlayer(command SignOutPlayerCommand) error
  PurgeInactivePlayers(command PurgeInactivePlayersCommand) (count uint, err error)
}

type ForPlayingCards interface {
  FinishCard(command FinishCardCommand) error
  RejectCard(command RejectCardCommand) error
}


##### the fine-grained version #####

type ForSelectingDecks interface {
  Select(command SelectDeckCommand) error
}

type ForUnselectingDecks interface {
  Unselect(command UnselectDeckCommand) error
}

###

type ForEnrollingPlayers interface {
  Enroll(command EnrollPlayerCommand) error
}

type ForsigningOutPlayers interface {
  SignOut(command SignOutPlayerCommand) error
}

type ForPurgingInactivePlayers interface {
  Purge(command PurgeInactivePlayersCommand) (count uint, err error)
}

###

type ForFinishingCards interface {
  Finish(command FinishCardCommand) error
}

type ForRejectingCards interface {
  Reject(command RejectCardCommand) error
}