编辑“︁GameDesign”︁（章节）

= GameManager =
The logic is similar to this:
<pre>
GameManager
  {
  NetworkManager read Message

  switch(Message type)
    {
    case ...;
    }
  }
</pre>

So let's define the reply to each message. First, let's clarify that the best way of modelling this system is using finite automates, (a finite state machine) where, based on the input, we change the state we are currently in and produce an output.
== Login stage ==
<b>NOTE</b>: This stage has been split in 3 to allow proper secure login.
<b>NOTE</b>: Explain here how secure login works.

<pre>
Process C2S Login ( STATE_BEGIN_LOGIN )
  Precondition: The state MUST be NULL

  Test if there is room for more players.
  if there is no more room
    {
    reply S2C Login NACK( SERVER_FULL )
    state = NULL
    }

  if check username, password in database is correct
    {
    create clientid
    add PlayerEntry
    notify database

    reply S2C Login ACK

    get characters list of the player
    reply S2C CharacterList

    state = STATE_LOGIN_COMPLETE
    }
  else
    {
    notify database

    reply S2C Login NACK( LOGIN_INCORRECT )
    state = NULL
    }

  Postcondition: The state MUST be NULL or STATE_LOGIN_COMPLETE
    and a we have created a PlayerEntry for this player with a unique clientid.

</pre>

== Choose character stage ==
<pre>
Process C2S ChooseCharacter ( STATE_LOGIN_COMPLETE )
  Precondition: The state MUST be STATE_LOGIN_COMPLETE

  if character exists in database
    {
    add character to Player's PlayerEntry
    add character to game
    reply S2C Choose Character ACK

    state = STATE_GAME_BEGIN
    }
  else
    {
    reply S2C Choose Character NACK
    state = STATE_LOGIN_COMPLETE
    }

  Postcondition: The state MUST be STATE_GAME_BEGIN and the PlayerStructure
    should be completely filled or if the character choise was wrong the state is STATE_LOGIN_COMPLETE

</pre>

== Logout stage ==
<pre>

Process C2S Logout ( STATE_GAME_END )
  Precondition: The state can be anything but STATE_LOGIN_BEGIN

  if( rpEngine allows player to logout )
    {
    reply S2C Logout ACK
    state = NULL

    store character in database
    remove character from game
    delete PlayerEntry
    }
  else
    {
    reply S2C Logout NACK
    }

  Postcondition: Either the same as the input state or the state currently in

</pre>

== Perception confirmation stage ==
<pre>

Process C2S Perception ACK
  Precondition: The state must be STATE_LOGIN_BEGIN

  notify that the player received the perception.

  Postcondition: The state is STATE_LOGIN_BEGIN and Timestamp field in
  PlayerContainer is updated.

</pre>

== Transfer confirmation stage ==
<pre>

Process C2S Transfer ACK
  Precondition: The state must be STATE_LOGIN_BEGIN

  foreach content waiting for this player
    {
    if client acked it 
      {
      send content to client
      } 
    }

  Postcondition: The state is STATE_LOGIN_BEGIN and the content waiting for player is clear.
</pre>