Changed the name and moved Communication with the GDL VM after the structure of the GGS
This commit is contained in:
Jeena Paradies
parent
4230b38c31
commit
e82339fd94
1 changed files with 460 additions and 452 deletions
912
report.lyx
912
report.lyx
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@ -3642,7 +3642,7 @@ dispatcher module
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\begin_inset Float figure
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wide false
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sideways false
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status collapsed
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status open
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\begin_layout Plain Layout
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\begin_inset ERT
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@ -4063,455 +4063,6 @@ Here we can have a more in-depth look at why Erlang was used, and outline
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\end_inset
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\end_layout
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\begin_layout Section
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Communication with external systems and applications
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\begin_inset CommandInset label
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LatexCommand label
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name "sec:Communication-with-external"
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\end_inset
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\end_layout
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\begin_layout Standard
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A game launched on the GGS is run within a virtual machine.
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For each programming language supported, there is a virtual machine that
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interprets the game.
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Furthermore an interface for communication between the GGS, the game and
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the players playing the game is present.
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\end_layout
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\begin_layout Standard
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Callbacks written in Erlang are registered to the VM for the interface to
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work.
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It is only with the help of the interface that the game developer can access
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the game state and send messages to the clients.
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The interface provides access to three objects called
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\emph on
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world, players
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\emph default
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and
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\emph on
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localStorage
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\emph default
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.
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The game state is safely stored in a database and retrieved for manipulation
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by a call for the world object.
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Interaction with the players is done by using the
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\emph on
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GGS.sendCommand(player_id, command, args)
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\emph default
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and
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\emph on
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GGS.
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\emph default
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sendCommandToAll(command, args).
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The localStorage is a convenient way to store globals and other variables
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seperated from the game state.
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Unique id:s called gametokens are generated for hosted games so that they
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are not mixed up.
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\begin_inset ERT
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status open
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\begin_layout Plain Layout
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\backslash
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nomenclature{
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\backslash
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textbf{WebStorage}}{A new standard for letting websites store data on visitors'
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computers}
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Subsection
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Exposing Erlang functionality to the GDL VM
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\end_layout
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\begin_layout Standard
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\begin_inset Note Note
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status open
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\begin_layout Plain Layout
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Prior to this section, the Erlang syntax has to be briefly explained.
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I think the 'usage of erlang' section is a good place to do this in.
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Standard
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\begin_inset Float algorithm
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wide false
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sideways false
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status open
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\begin_layout Plain Layout
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\begin_inset ERT
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status open
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\begin_layout Plain Layout
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\backslash
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lstset{
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\end_layout
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\begin_layout Plain Layout
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language=Erlang,
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\end_layout
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\begin_layout Plain Layout
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backgroundcolor=
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\backslash
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color{white},
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\end_layout
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\begin_layout Plain Layout
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extendedchars=true,
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\end_layout
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\begin_layout Plain Layout
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basicstyle=
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\backslash
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footnotesize
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\backslash
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ttfamily,
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\end_layout
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\begin_layout Plain Layout
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showstringspaces=false,
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\end_layout
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\begin_layout Plain Layout
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showspaces=false,
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\end_layout
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\begin_layout Plain Layout
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numbers=left,
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\end_layout
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\begin_layout Plain Layout
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numberstyle=
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\backslash
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footnotesize,
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\end_layout
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\begin_layout Plain Layout
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numbersep=9pt,
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\end_layout
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\begin_layout Plain Layout
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tabsize=2,
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\end_layout
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\begin_layout Plain Layout
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breaklines=true,
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\end_layout
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\begin_layout Plain Layout
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showtabs=false,
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\end_layout
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\begin_layout Plain Layout
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captionpos=b
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\end_layout
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\begin_layout Plain Layout
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}
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\end_layout
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\begin_layout Plain Layout
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\backslash
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begin{lstlisting}[language=Erlang]
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\end_layout
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\begin_layout Plain Layout
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% @doc Exposes some GGS functions to JavaScript
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\end_layout
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\begin_layout Plain Layout
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expose(GameVM, Table) ->
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\end_layout
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\begin_layout Plain Layout
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Global = erlv8_vm:global(GameVM),
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\end_layout
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\begin_layout Plain Layout
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Global:set_value("GGS", erlv8_object:new([
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\end_layout
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\begin_layout Plain Layout
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{"localStorage", erlv8_object:new([
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\end_layout
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\begin_layout Plain Layout
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{"setItem", fun(#erlv8_fun_invocation{}, [Key, Val])->
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\end_layout
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\begin_layout Plain Layout
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ggs_db:setItem(Table, local_storage, Key, Val)
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\end_layout
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\begin_layout Plain Layout
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end},
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\end_layout
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\begin_layout Plain Layout
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{"getItem", fun(#erlv8_fun_invocation{}, [Key])->
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\end_layout
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\begin_layout Plain Layout
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ggs_db:getItem(Table, local_storage, Key)
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\end_layout
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\begin_layout Plain Layout
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end}
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\end_layout
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\begin_layout Plain Layout
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% more functions ...
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\end_layout
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\begin_layout Plain Layout
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])},
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\end_layout
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\begin_layout Plain Layout
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{"world", erlv8_object:new([
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\end_layout
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\begin_layout Plain Layout
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{"setItem", fun(#erlv8_fun_invocation{}, [Key, Val])->
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\end_layout
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\begin_layout Plain Layout
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ggs_db:setItem(Table, world, Key, Val),
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\end_layout
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\begin_layout Plain Layout
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ggs_table:send_command_to_all(
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\end_layout
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\begin_layout Plain Layout
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Table, {"world_set", Key ++ "=" ++ Val}
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\end_layout
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\begin_layout Plain Layout
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)
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\end_layout
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\begin_layout Plain Layout
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end},
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\end_layout
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\begin_layout Plain Layout
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{"getItem", fun(#erlv8_fun_invocation{}, [Key])->
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\end_layout
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\begin_layout Plain Layout
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ggs_db:getItem(Table, world, Key),
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\end_layout
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\begin_layout Plain Layout
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end}
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\end_layout
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\begin_layout Plain Layout
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% more functions ...
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\end_layout
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\begin_layout Plain Layout
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])},
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\end_layout
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\begin_layout Plain Layout
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{"sendCommand", fun(#erlv8_fun_invocation{}, [Player, Command, Args])->
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\end_layout
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\begin_layout Plain Layout
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ggs_table:send_command(Table, Player, {Command, Args})
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\end_layout
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\begin_layout Plain Layout
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end},
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\end_layout
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\begin_layout Plain Layout
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{"sendCommandToAll", fun(#erlv8_fun_invocation{}, [Command, Args])->
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\end_layout
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\begin_layout Plain Layout
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ggs_table:send_command_to_all(Table, {Command, Args})
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\end_layout
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\begin_layout Plain Layout
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end}
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\end_layout
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\begin_layout Plain Layout
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{"setTimeout", fun(#erlv8_fun_invocation{}, [Time, Function])->
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\end_layout
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\begin_layout Plain Layout
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timer:apply_after(Time, ?MODULE, call_js, [GameVM, Function])
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\end_layout
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\begin_layout Plain Layout
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end}
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\end_layout
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\begin_layout Plain Layout
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% more functions ...
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\end_layout
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\begin_layout Plain Layout
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])).
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\end_layout
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\begin_layout Plain Layout
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\backslash
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end{lstlisting}
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Plain Layout
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\begin_inset Caption
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\begin_layout Plain Layout
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\begin_inset CommandInset label
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LatexCommand label
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name "alg:exposing-erlang"
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\end_inset
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An example of how Erlang functionality is exposed to a JavaScript GDL
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\end_layout
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\end_inset
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Standard
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\begin_inset Note Note
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status open
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\begin_layout Plain Layout
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TODO: Go in to more detail about how the world, player and localstorage
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objects are implemented.
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Also discuss localstorage and how it derives from the webstorage standard
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in detail.
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This is a great point on how we try to follow standards.
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Standard
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\begin_inset Note Note
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status open
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\begin_layout Plain Layout
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My idea here is that we describe the erlang-js (which failed, but nontheless),
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v8, UUID and other external communication.
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We shouldn't describe sockets here though..
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or..
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maybe?
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\end_layout
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\begin_layout Plain Layout
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Also discuss how we allow GDLs to communicate with Erlang, this is
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\begin_inset Quotes eld
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\end_inset
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external
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\begin_inset Quotes erd
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\end_inset
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to thre GDL.
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Discuss the GGS world object (there is a reference to this secxtion for
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that purpose)
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\end_layout
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\end_inset
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\end_layout
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\begin_layout Section
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@ -5214,6 +4765,14 @@ The VM itself makes it possible for the game developer to program in the
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\begin_layout Standard
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This module does not affect game runtime but evaluates a new game state
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and handles communication between the game and the players.
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A closer look at the structure of this model is given in
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\begin_inset CommandInset ref
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LatexCommand vref
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reference "sec:Communication-with-the-GDL-VM"
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\end_inset
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.
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\end_layout
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\begin_layout Subsection
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@ -5485,6 +5044,455 @@ The player module sends the message with help of the gen_tcp module to the
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client
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\end_layout
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\begin_layout Section
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Communication with the GDL VM
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\begin_inset CommandInset label
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LatexCommand label
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name "sec:Communication-with-the-GDL-VM"
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\end_inset
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\end_layout
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\begin_layout Standard
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A game launched on the GGS is run within a virtual machine.
|
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For each programming language supported, there is a virtual machine that
|
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interprets the game.
|
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Furthermore an interface for communication between the GGS, the game and
|
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the players playing the game is present.
|
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\end_layout
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|
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\begin_layout Standard
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Callbacks written in Erlang are registered to the VM for the interface to
|
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work.
|
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It is only with the help of the interface that the game developer can access
|
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the game state and send messages to the clients.
|
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The interface provides access to three objects called
|
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\emph on
|
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world, players
|
||||
\emph default
|
||||
and
|
||||
\emph on
|
||||
localStorage
|
||||
\emph default
|
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.
|
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The game state is safely stored in a database and retrieved for manipulation
|
||||
by a call for the world object.
|
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Interaction with the players is done by using the
|
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\emph on
|
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GGS.sendCommand(player_id, command, args)
|
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\emph default
|
||||
and
|
||||
\emph on
|
||||
GGS.
|
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\emph default
|
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sendCommandToAll(command, args).
|
||||
The localStorage is a convenient way to store globals and other variables
|
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seperated from the game state.
|
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Unique id:s called gametokens are generated for hosted games so that they
|
||||
are not mixed up.
|
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\begin_inset ERT
|
||||
status open
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
|
||||
\backslash
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nomenclature{
|
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\backslash
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textbf{WebStorage}}{A new standard for letting websites store data on visitors'
|
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computers}
|
||||
\end_layout
|
||||
|
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\end_inset
|
||||
|
||||
|
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\end_layout
|
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|
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\begin_layout Subsection
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Exposing Erlang functionality to the GDL VM
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||||
\end_layout
|
||||
|
||||
\begin_layout Standard
|
||||
\begin_inset Note Note
|
||||
status open
|
||||
|
||||
\begin_layout Plain Layout
|
||||
Prior to this section, the Erlang syntax has to be briefly explained.
|
||||
I think the 'usage of erlang' section is a good place to do this in.
|
||||
\end_layout
|
||||
|
||||
\end_inset
|
||||
|
||||
|
||||
\end_layout
|
||||
|
||||
\begin_layout Standard
|
||||
\begin_inset Float algorithm
|
||||
wide false
|
||||
sideways false
|
||||
status collapsed
|
||||
|
||||
\begin_layout Plain Layout
|
||||
\begin_inset ERT
|
||||
status open
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
|
||||
\backslash
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||||
lstset{
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||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
language=Erlang,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
backgroundcolor=
|
||||
\backslash
|
||||
color{white},
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
extendedchars=true,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
basicstyle=
|
||||
\backslash
|
||||
footnotesize
|
||||
\backslash
|
||||
ttfamily,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
showstringspaces=false,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
showspaces=false,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
numbers=left,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
numberstyle=
|
||||
\backslash
|
||||
footnotesize,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
numbersep=9pt,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
tabsize=2,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
breaklines=true,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
showtabs=false,
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
captionpos=b
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
}
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
|
||||
\backslash
|
||||
begin{lstlisting}[language=Erlang]
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
% @doc Exposes some GGS functions to JavaScript
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
expose(GameVM, Table) ->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
Global = erlv8_vm:global(GameVM),
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
Global:set_value("GGS", erlv8_object:new([
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"localStorage", erlv8_object:new([
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"setItem", fun(#erlv8_fun_invocation{}, [Key, Val])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_db:setItem(Table, local_storage, Key, Val)
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end},
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"getItem", fun(#erlv8_fun_invocation{}, [Key])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_db:getItem(Table, local_storage, Key)
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end}
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
% more functions ...
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
])},
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"world", erlv8_object:new([
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"setItem", fun(#erlv8_fun_invocation{}, [Key, Val])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_db:setItem(Table, world, Key, Val),
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_table:send_command_to_all(
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
Table, {"world_set", Key ++ "=" ++ Val}
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
)
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end},
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"getItem", fun(#erlv8_fun_invocation{}, [Key])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_db:getItem(Table, world, Key),
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end}
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
% more functions ...
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
])},
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"sendCommand", fun(#erlv8_fun_invocation{}, [Player, Command, Args])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_table:send_command(Table, Player, {Command, Args})
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end},
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"sendCommandToAll", fun(#erlv8_fun_invocation{}, [Command, Args])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
ggs_table:send_command_to_all(Table, {Command, Args})
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end}
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
{"setTimeout", fun(#erlv8_fun_invocation{}, [Time, Function])->
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
timer:apply_after(Time, ?MODULE, call_js, [GameVM, Function])
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
end}
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
% more functions ...
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
])).
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
|
||||
|
||||
\backslash
|
||||
end{lstlisting}
|
||||
\end_layout
|
||||
|
||||
\end_inset
|
||||
|
||||
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
\begin_inset Caption
|
||||
|
||||
\begin_layout Plain Layout
|
||||
\begin_inset CommandInset label
|
||||
LatexCommand label
|
||||
name "alg:exposing-erlang"
|
||||
|
||||
\end_inset
|
||||
|
||||
An example of how Erlang functionality is exposed to a JavaScript GDL
|
||||
\end_layout
|
||||
|
||||
\end_inset
|
||||
|
||||
|
||||
\end_layout
|
||||
|
||||
\end_inset
|
||||
|
||||
|
||||
\end_layout
|
||||
|
||||
\begin_layout Standard
|
||||
\begin_inset Note Note
|
||||
status open
|
||||
|
||||
\begin_layout Plain Layout
|
||||
TODO: Go in to more detail about how the world, player and localstorage
|
||||
objects are implemented.
|
||||
Also discuss localstorage and how it derives from the webstorage standard
|
||||
in detail.
|
||||
This is a great point on how we try to follow standards.
|
||||
\end_layout
|
||||
|
||||
\end_inset
|
||||
|
||||
|
||||
\end_layout
|
||||
|
||||
\begin_layout Standard
|
||||
\begin_inset Note Note
|
||||
status open
|
||||
|
||||
\begin_layout Plain Layout
|
||||
My idea here is that we describe the erlang-js (which failed, but nontheless),
|
||||
v8, UUID and other external communication.
|
||||
We shouldn't describe sockets here though..
|
||||
or..
|
||||
maybe?
|
||||
\end_layout
|
||||
|
||||
\begin_layout Plain Layout
|
||||
Also discuss how we allow GDLs to communicate with Erlang, this is
|
||||
\begin_inset Quotes eld
|
||||
\end_inset
|
||||
|
||||
external
|
||||
\begin_inset Quotes erd
|
||||
\end_inset
|
||||
|
||||
to thre GDL.
|
||||
Discuss the GGS world object (there is a reference to this secxtion for
|
||||
that purpose)
|
||||
\end_layout
|
||||
|
||||
\end_inset
|
||||
|
||||
|
||||
\end_layout
|
||||
|
||||
\begin_layout Section
|
||||
Techniques for ensuring reliability
|
||||
\end_layout
|
||||
|
|
@ -5919,7 +5927,7 @@ changeNick
|
|||
function uses a feature of the GGS called localStorage (see section
|
||||
\begin_inset CommandInset ref
|
||||
LatexCommand ref
|
||||
reference "sec:Communication-with-external"
|
||||
reference "sec:Communication-with-the-GDL-VM"
|
||||
|
||||
\end_inset
|
||||
|
||||
|
|
@ -5947,7 +5955,7 @@ GGS object
|
|||
Implementation specifics of the GGS object are provided in
|
||||
\begin_inset CommandInset ref
|
||||
LatexCommand ref
|
||||
reference "sec:Communication-with-external"
|
||||
reference "sec:Communication-with-the-GDL-VM"
|
||||
|
||||
\end_inset
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue