DutchBlitz with F# and DDD - improved workflow

dutchblitz_join-game_workflow_improved.txt

Bounded Context: Dutch Blitz game

Workflow: "Join Game"
Triggered by: 
  "Join Game" command
Primary input: 
  A join request
Output events:
  "Player joined game" event
Side-effects:
  An acknowledgment is sent to the person

// step 1
do CheckGameAvailability
If game does not exist then:
Do not allow person to continue
stop
If game has started then:
Do not allow person to join
stop
If game is full then:
Do not allow person to join
stop

// step 2
do AddPersonToGame

// step 3
do SendAknowledgementToPerson

// step 4
return PlayerJoinedGame event (if no errors)