gistfile1.scala

def apply(conversationID: ConversationID): Behavior[SessionCommand] =
  Behaviors.setup[SessionCommand] { context =>
    EventSourcedBehavior[SessionCommand, SessionEvent, ConversationInMemoryState](
      persistenceId = PersistenceId.ofUniqueId(conversationID.toString()),
      emptyState = ConversationInMemoryState(
        mutable.Map[ConversationID, List[(UserID, String)]]()
      ),
      commandHandler = { (state, command) => commandHandler(state, command, context) },
      eventHandler = { (state, event) => eventHandler(state, event, context) }
    )
  }