diff --git a/graphics/Chess_no_text.dia b/graphics/Chess_no_text.dia
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diff --git a/graphics/Chess_no_text.eps b/graphics/Chess_no_text.eps
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diff --git a/report.lyx b/report.lyx
index dc8d147..40acde2 100644
--- a/report.lyx
+++ b/report.lyx
@@ -155,7 +155,7 @@ end{textblock*}
 \end_layout
 
 \begin_layout Title
-Generic Game Server
+Reliable Generic Game Server
 \end_layout
 
 \begin_layout Author
@@ -288,31 +288,29 @@ Introduction
 \end_layout
 
 \begin_layout Standard
-The introduction aims to give the reader a good base to stand on when taking
- on the rest of this thesis.
- A background and motivation of why this topic is interesting is given,
- and some basic terminoligy is defined and explained.
- To understand many of the core issues in the GGS, some prior knowledge
- of other topics is needed, the introduction aims to give this prior knowledge.
-\end_layout
+Online gaming, and computer gaming in general has become an important part
+ in many peoples day-to day lives.
+ A few years ago, computer games were not at all as popular as they are
+ today.
+ With the advances in computer graphics and computer hardware today's games
+ are much more sophisticated then they were in the days of 
+\emph on
+Hack
+\emph default
+, 
+\emph on
+Zork, 
+\emph default
+or 
+\emph on
+Pac Man.
+\emph default
 
-\begin_layout Standard
-We draw some parallels to existing solutions which solve similar problems
- in different sectors.
- The main challenges of the project are outlined, with the solutions thereof
- following later on in the paper.
- Some boundaries are placed on the project, since it is not possible to
- cover everything at once.
- By placing these boundaries, the purpose of the GGS is further refined.
-\end_layout
-
-\begin_layout Standard
 \begin_inset Note Note
 status open
 
 \begin_layout Plain Layout
-Also cover the final topics; method (development process, etc).
- As of this eriting, the contents of method are unknown.
+Was it really called Zork?
 \end_layout
 
 \end_inset
@@ -320,6 +318,151 @@ Also cover the final topics; method (development process, etc).
 
 \end_layout
 
+\begin_layout Standard
+The early computer games featured simple, or no graphics at all.
+ 
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Drop a reference to Hack
+\end_layout
+
+\end_inset
+
+ The games often took place in a textual world, leaving the task of picturing
+ the world up to the player.
+ Multi-player games were not as common as they are today, whereas most games
+ today are expected to have a multi-player mode, most early games did not.
+\end_layout
+
+\begin_layout Standard
+Since these early games, the gaming industry have become much more influential
+ in many ways.
+ Many advanced in computer hardware are thought to come from pressure from
+ the computer game industry.
+ More powerful games require more powerful, and more easily available hardware
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Drop a reference to the gaming industry pressuring more advanced hardware
+\end_layout
+
+\end_inset
+
+.
+ Due to the high entertainment value of modern computer games, gaming has
+ become a huge industry, where large amounts of money are invested.
+ The gaming industry is today, in some places even larger than the motion
+ picture industry.
+ 
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Drop a reference to that graphic we found, about the motion picture industry
+ VS.
+ gaming industry
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Due to the increasing importance of computer gaming, more focus should be
+ spent on improving the quality of the gaming service.
+ As more and more computer games are gaining multi-player capabilities,
+ the demands for multiplayer networking software rises.
+ This thesis is about techniques for improving the quality if this networking
+ software.
+\end_layout
+
+\begin_layout Standard
+The reliable generic game server, hereafter known as GGS, is a computer
+ program designed to 
+\emph on
+host
+\emph default
+ network games on one or more server computers.
+ Hosting, in a network software setting, means allowing client software
+ connect to the server software, for the purpose of utilizing services provided
+ by the server.
+ The GGS software provides games as a service, and the clients connecting
+ to the GGS can play these games on the GGS.
+\end_layout
+
+\begin_layout Standard
+The idea of game servers is not new, network games have been played for
+ decades.
+ Early, popular examples of network games include the 
+\emph on
+Quake
+\emph default
+ series, or the 
+\emph on
+Doom
+\begin_inset Note Note
+status collapsed
+
+\begin_layout Plain Layout
+
+\emph on
+Come up w/ better game
+\end_layout
+
+\end_inset
+
+
+\emph default
+ games.
+ Newer examples of network games include 
+\emph on
+World of Warcraft
+\emph default
+, and 
+\emph on
+Counter-Strike
+\emph default
+.
+ The difference between the GGS and the servers for these games is that
+ the servers for Doom, Quake, and the others listed, were designed with
+ these specific games in mind.
+\end_layout
+
+\begin_layout Standard
+What GGS does is to provide a 
+\emph on
+generic
+\emph default
+ framework for developing network games.
+ The framework is generic in the sense that it is not bound to a specific
+ game.
+ There are many different types of games, some are inheritly more time sensitive
+ than others, strategy games are examples of games which are not very sensitive
+ to time delays, first-person shooters however, can be very sensitive.
+\end_layout
+
+\begin_layout Standard
+The generic nature of the GGS allows the creation of many different types
+ of games, the motivation behind this is to remove the neccessity of writing
+ new game servers when developing new games.
+\end_layout
+
+\begin_layout Standard
+The GGS is in addition to being generic, also 
+\emph on
+reliable
+\emph default
+ in the sense that the gaming service provided is consistant and available.
+ A consistant and available server is a server that handles hardware failiures
+ and software failiures gracefully.
+ In the event of a component breaking within the GGS, the error is handled
+ by fault recovery processes, thereby creating a more reliable system.
+\end_layout
+
 \begin_layout Section
 Background 
 \end_layout
@@ -327,18 +470,36 @@ Background
 \begin_layout Standard
 The game industry is a quickly growing industry where the need for new technique
 s is large.
- One specific section where development has stalled is the game server section.
+ One specific section where the development has stalled is the game server
+ section.
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Citation needed
+\end_layout
+
+\end_inset
+
  The existing game servers are functional but they lack good fault tolerance
- and the ability to scale well.
+ and the ability to scale well
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Citation needed
+\end_layout
+
+\end_inset
+
+.
  Users will notice this in low uptime and many crashes.
  This is a problem that has existed and been resolved in other industries.
- One good example is the telecom industry which managed to develop solutions
- to similar problems.
+ In the telecom industry solutins to similar problems have been found.
 \end_layout
 
 \begin_layout Standard
-A common figure often used to measure the availability in telecoms is that
- of 
+A common figure often used in telecoms is that of 
 \emph on
 the nine nines
 \emph default
@@ -355,24 +516,30 @@ the nine nines
  industry would not have been accepted in the telecoms industry.
  This level of instability should not be accepted in the game server industry
  either.
+ An unavailabvle phone system could potentially have life threatening consequenc
+es, leaving the public unable to contant emergency services.
+ The same can not be said about an unavailable game server.
+ The statement that game servers are less important than phone systems is
+ not a reason not to draw wisdom from what the telecoms have already learnt.
 \end_layout
 
 \begin_layout Standard
-The main reason to develop reliable servers are monetary as it is important
- for game companies to expand their customer base.
+Moving back to the gaming industry.
+ The main reason to develop reliable servers are monetary, it is important
+ for game companies to expand its customer base.
  Reliable game servers are one improvement that will create a good image
  of a company.
  In general the downtime of game servers are much higher than the downtime
  of telecom system.
- The structure of the system is similar and it should be possible to reuse
- solutions from the telecom system to improve game servers.
+ The structure of the system is similar in many ways and it should be possible
+ to reuse solutions from the telecom system to improve game servers.
+ 
 \end_layout
 
 \begin_layout Standard
-In the current state game servers are coded for specific games, in many
- cases this seems like a bad solution.
- Developers that want to make a network game need to understand network
- programming.
+In the current state game servers are developed on a per-game basis, in
+ many cases this seems like a bad solution.
+ Developers of network game need to understand network programming.
  A way to change this is a generic game server which give the game developers
  a server which they implement their game towards.
  This approach would not only make it easier to develop network games, it
@@ -380,30 +547,31 @@ In the current state game servers are coded for specific games, in many
  using the same server.
 \end_layout
 
-\begin_layout Section
-Purpose
-\end_layout
-
 \begin_layout Standard
-The purpose of the GGS project is to create a 
+Some factors key to the development of GGS have been isolated.
+ Many of these come from the telecom sector.
+ The factors are 
 \emph on
-scalable
+scalability, fault tolerance 
 \emph default
- and 
-\emph on
-fault tolerant
-\emph default
- server, while still allowing the server to be as 
+and being 
 \emph on
 generic
 \emph default
- as possible.
- These three italicised terms need some explanation.
+.
+ These terms are defined below.
 \end_layout
 
 \begin_layout Standard
-Scalability in computer science is a large topic and is commonly divided
- into sub-fields, two of which are 
+Scalability (see 
+\begin_inset CommandInset ref
+LatexCommand ref
+reference "sec:Scalability"
+
+\end_inset
+
+) in computer science is a large topic and is commonly divided into sub-fields,
+ two of which are 
 \emph on
 structural scalability
 \emph default
@@ -427,7 +595,14 @@ key "Bondi:2000:CSI:350391.350432"
 \end_layout
 
 \begin_layout Standard
-Fault tolerance is used to raise the level of 
+Fault tolerance (see 
+\begin_inset CommandInset ref
+LatexCommand ref
+reference "sec:Fault-Tolerance"
+
+\end_inset
+
+) is used to raise the level of 
 \emph on
 dependability
 \emph default
@@ -452,8 +627,15 @@ key "Gartner:1999:FFD:311531.311532"
 \end_layout
 
 \begin_layout Standard
-A generic game server has to be able to run different client-server network
- games regardless of the platform the clients are running on.
+A generic (see 
+\begin_inset CommandInset ref
+LatexCommand ref
+reference "sec:Generic"
+
+\end_inset
+
+) game server has to be able to run different client-server network games
+ regardless of the platform the clients are running on.
  It runs network games of different type.
  A very rough separation of games is real time games and turn based games.
 \end_layout
@@ -461,14 +643,14 @@ A generic game server has to be able to run different client-server network
 \begin_layout Standard
 The server behaves in a way similar to an application server, but is designed
  to help running games.
- An application server provides processing ability and time; therefore,
- it is different from a file- or print-server, which only serves resources
+ An application server provides processing ability and time, therefore it
+ is different from a file- or print-server, which only serves resources
  to the clients.
 \end_layout
 
 \begin_layout Standard
-The most common type of application servers are web servers, where the user
- run a web application within the server.
+The most common type of application servers are web servers, where you run
+ a web application within the server.
  The application server provides an environment and interfaces to the outer
  world, in which applications run.
  Hooks and helpers are provided to use the resources of the server.
@@ -507,10 +689,114 @@ One of the purposes of this thesis is to investigate how we can make a game
  server as generic as possible.
  Some important helpers are discussed, such as abstraction of the network
  layer, data store and game specific features.
+ 
+\end_layout
+
+\begin_layout Standard
+As an aid in discussing the theoretical parts of the GGS a prototype has
+ been developed.
+ The prototype does not feature all of the characteristics described in
+ this thesis.
+ A selection has been made among the features, and the most important ones
+ have been implemented either full or in part in the prototype.
+\end_layout
+
+\begin_layout Standard
+The choice of implementation language for the prototype of the GGS was made
+ with inspiration from the telecom industry.
+ The Erlang language was developed by the telecom company Ericsson to develop
+ highly available and dependable telecom switches.
+ One of the most reliable systems ever developed by Ericsson, the AXD301
+ was developed using Erlang.
+ The AXD301 is also possibly has the largest code base even written in a
+ functional language 
+\begin_inset CommandInset citation
+LatexCommand citep
+key "Armstrong03"
+
+\end_inset
+
+.
+ The same language is used to develop the prototype of the GGS.
+ Chapter 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "cha:Implementation-of-a"
+
+\end_inset
+
+ provides a description of the prototype developed for this thesis.
+  
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+We could go on and on about erlang..
+\end_layout
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Section
-Challenges 
+Purpose
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status collapsed
+
+\begin_layout Plain Layout
+The purpose of the GGS project.
+ What is the purpose of creating a fault tolerant server, why is it generic,
+ and what good does it do to have a scalable system? In the background,
+ we should give the motivations behind creating this software, but here
+ we should outline why the software is needed.
+ This section should be shortened, and the bulk of the text should be moved
+ to theory or background.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+The purpose of creating a generic and fault tolerant game server is to provide
+ a good framework for the development of many different types of games.
+ Allowing the system to scale up and down is a powerful way to maximize
+ the usage of physical resources.
+ By scaling up to new machines when load increases, and scaling down from
+ machines when load decreases costs and energy consumption can be optimized.
+\end_layout
+
+\begin_layout Standard
+Fault tolerance is important for the GGS in order to create a reliable service.
+ The purpose of a reliable game server is to provide a consistant service
+ to people using the server.
+ Going back to the telecom example, the purpose of creating a reliable telecom
+ system is to allow calls, possibly emergency calls, at any time.
+ Should the telecom network be unavailable at any time, emergency services
+ may become unavailable, furthermore the consumer image of the telecom system
+ degrades.
+\end_layout
+
+\begin_layout Standard
+Returning to the game industry, emergency services will not be contacted
+ using a game server, however an unavailable server will degrade the consumer
+ image of the system.
+ Consider an online casino company.
+ The online casino company's servers must be available at all times to allow
+ customers to play.
+ If the servers are unavailable, customers can not play, and the company
+ loses money.
+ In this scenario, an unavailable server can be compared to a closed real-world
+ casino.
+\end_layout
+
+\begin_layout Section
+Challenges in developing the prototype
 \end_layout
 
 \begin_layout Standard
@@ -518,9 +804,9 @@ The word
 \emph on
 generic
 \emph default
- in the GGS implies that the system is able to run a very broad range of
- different code, for instance code written in different programming languages,
- in addition to a broad range of different game types.
+ in the name of the GGS implies that the system is able to run a very broad
+ range of different code, for instance code written in different programming
+ languages, in addition to a broad range of different game types.
  In order to support this, a virtual machine (VM) for each 
 \emph on
 game development language
@@ -591,7 +877,7 @@ reliable
 \end_layout
 
 \begin_layout Section
-Delimitations
+Limitations of the prototype
 \end_layout
 
 \begin_layout Standard
@@ -603,20 +889,42 @@ The implementation of the GGS protocol, together with storage possibilities,
 \end_layout
 
 \begin_layout Standard
-The UDP protocol will not be implemented, only TCP, the main reason behind
- this is a strict timetable.
- This decision means that games that requires a high speed protocol will
- not be supported by the GGS prototype.
+The UDP protocol is not supported for communication between client and server.
+ The TCP protocol was chosen in favour of UDP, due to the fact that the
+ implementation process using TCP was faster than if UDP would have been
+ used.
+ UDP is generally considered to be faster than TCP for the transfer of game
+ (and other) related data, this is discussed in more depth in 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "sec:Choice-of-network"
+
+\end_inset
+
+.
+ In short, the decision of using TCP means that games that requires a high
+ speed protocol will not be supported by the GGS prototype.
  Another limitation necessary to set on the system is the possibility to
- have huge game worlds.
- 
+ have huge game worlds due to the implementation of the scaling mechanism
+ in the prototype.
 \end_layout
 
 \begin_layout Standard
 In real time games all players are playing together at the same time.
  Latency is a huge problem in real time games, a typical round trip time
- for such games is one of 50 to 150 ms and everything above 200 ms is reported
- to be intolerable
+ for such games is one of 
+\begin_inset Formula $50$
+\end_inset
+
+ to 
+\begin_inset Formula $150ms$
+\end_inset
+
+ and everything above 
+\begin_inset Formula $200ms$
+\end_inset
+
+ is reported to be intolerable 
 \begin_inset CommandInset citation
 LatexCommand citet
 key "Farber:2002:NGT:566500.566508"
@@ -653,9 +961,8 @@ ng them, a Generic Game Server should address all of them and help the developer
 \end_layout
 
 \begin_layout Standard
-Due to the limited capability of threading in many GDL VMs, the GGS prototype
- will not support MMORPGs as it is not possible to implement and test something
- that complex within the projects timetable.
+Due to the limited capability of threading in many GDL VM:s, the GGS prototype
+ will not support MMORPG:s.
 \end_layout
 
 \begin_layout Standard
@@ -668,7 +975,7 @@ The implementation of the GGS described in this thesis is only a small prototype
 \end_layout
 
 \begin_layout Section
-Method 
+Method
 \end_layout
 
 \begin_layout Subsection
@@ -676,17 +983,54 @@ Development process
 \end_layout
 
 \begin_layout Standard
-May be Extreme Programming(XP), need to check this out further.
- Maybe adapt so we can say that we use a standardized software development
- method.
+A prototype was developed early on in the project in order to carry out
+ experiments.
+ Using this prototype, the system was divided into modules.
+ A demand specification was created, using this specification, the modules
+ were easily identifiable.
 \end_layout
 
-\begin_layout Subsubsection
-Demand specification 
+\begin_layout Standard
+The first prototype of the GGS consisted of simple modules, however, due
+ to the separation of concerns between the modules, they were easily independant
+ly modified and improved.
+\end_layout
+
+\begin_layout Standard
+Once the basic structure of the GGS had been established, the first prototype
+ was removed, remaining was the structure of the modules and the internal
+ flow of the application.
+ This could be seen as an interative workflow, with the first prototype
+ being the first iteration.
+ The second iteration later became the final result of the GGS
 \end_layout
 
 \begin_layout Subsection
-Design 
+Design
+\end_layout
+
+\begin_layout Standard
+The layout of the GGS is both layered and modular.
+ The first layer handles the most primitive data and produces a higher level
+ representation of the data, passing it along to different modules of the
+ GGS.
+ The modular structure of the GGS plays an important role in making the
+ system fault tolerant.
+ The approach to fault tolerance is by replication, and restarting faulting
+ modules with the last known good data.
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Perhaps a graphic of this modular layout..?
+\end_layout
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Subsection
@@ -698,7 +1042,7 @@ Can we use quickcheck?
 \end_layout
 
 \begin_layout Chapter
-Theory 
+Theory behind the GGS 
 \begin_inset CommandInset label
 LatexCommand label
 name "cha:Theory"
@@ -710,16 +1054,727 @@ name "cha:Theory"
 
 \begin_layout Standard
 In this chapter, the theory behind the techniques used in the GGS are discussed.
- Performance issues and the measuring of performance are discussed.
+ Performance issues and the measuring of performance is discussed.
  Benchmarking techniques are discussed.
- The options when choosing network protocols are given, along with advantages
- and disadvantages for each of the alternatives.
- Finally, an overview of scalability, fault tolerance and availability is
+ The options when choosing network protocols are given, along with a discussion
+ of each alternative.
+ Finally, a overview of scalability, fault tolerance and availability is
  presented.
 \end_layout
 
 \begin_layout Section
-Performance 
+Design of the GGS system
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:Design-of-the"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+The GGS is modelled after a real world system performing much of the same
+ duties as GGS.
+ This is common practice 
+\begin_inset CommandInset citation
+LatexCommand citep
+key "armstrong2011"
+
+\end_inset
+
+ in the computer software world, in order to understand complex problems
+ more easily.
+ While there may not always be a real world example of a system performing
+ th exact duties of the system being modelled in the computer, it is often
+ easier to create and analyze requirements for real world systems and processes
+ than systems existing soley in a computer.
+ The requirements and limitations imposed on the real-world system can,
+ using the proper tools, be transferred in to the software.
+\end_layout
+
+\begin_layout Standard
+The real world system chosen for the GGS is a 
+\begin_inset Quotes eld
+\end_inset
+
+Chess club
+\begin_inset Quotes erd
+\end_inset
+
+ - a building where chess players can meet and play chess.
+ Since a real-world scenario is readily available, and to such a large extent
+ resembles the computer software required for the GGS, the next step in
+ developing the GGS system is to duplicate this real world scenario in a
+ software setting.
+\end_layout
+
+\begin_layout Standard
+Some requirements, limitations and additions were made to the chess club
+ system, so that the system would more easily and efficiently be replicated
+ in a software setting.
+\end_layout
+
+\begin_layout Standard
+In the text below, two examples will be presented.
+ On example is that of a real-world chess club, in which players meet to
+ play chess against each other, the other example is the GGS, and how it
+ corresponds to this chess club.
+ 
+\begin_inset Float figure
+wide false
+sideways false
+status collapsed
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+begin{centering}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset Graphics
+	filename graphics/theory_layout.eps
+	scale 40
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+end{centering}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset Caption
+
+\begin_layout Plain Layout
+\begin_inset CommandInset label
+LatexCommand label
+name "fig:theory-layout"
+
+\end_inset
+
+The layout of a physical 
+\begin_inset Quotes eld
+\end_inset
+
+Chess club
+\begin_inset Quotes erd
+\end_inset
+
+ with two players (P) sitting by each chess table (Table), a coordinator
+ keeps track of all moves and players in the building.
+ A player has to pass by the entrance to enter or exit the building.
+ The building is represented by the outermost box.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+In figure 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "fig:theory-layout"
+
+\end_inset
+
+ a graphical representation for the chess club is presented.
+ The club is seen from above.
+ The outermost box represents the building.
+ In the GGS setting, the building would represent one instance of GGS.
+ Several buildings linked together would represent a cluster of GGS instances.
+ In order for a player (the P symbol in the graphic) to enter the theoretical
+ chess club, the player must pass by the entrance.
+ By having each player pass by the entrance, a tally
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Does this mean what I think it does? 
+\begin_inset Quotes eld
+\end_inset
+
+Räkning
+\begin_inset Quotes erd
+\end_inset
+
+ ?
+\end_layout
+
+\end_inset
+
+ can be kept, ensuring that there are not too many players within the building.
+ In the GGS setting, too many players entering would mean too many connections
+ have been accepted to the GGS system, and that the structure of the system
+ thus must be modified, adding additional servers.
+\end_layout
+
+\begin_layout Standard
+Once a player has been allowed in to the chess club the player is greeted
+ by the host of the chess club, in the GGS setting represented by the 
+\emph on
+Coordinator
+\emph default
+, and is seated by a table.
+ The coordinator keeps track of all the players in the building, and all
+ moved made by the players.
+ The information available to the coordinator means that cheating can be
+ monitored and book keeping can be performed by this entity.
+\end_layout
+
+\begin_layout Standard
+Moves by players are made using the tables present in the chess club.
+ Every game is isolated to a table, just as expected.
+ This means that communication during a game only has to pass by the players
+ of that particular game, and the coordinator, making sure that no cheating
+ takes place.
+\end_layout
+
+\begin_layout Standard
+This isolation of the games plays an imporant part in many properties of
+ the GGS, the isolation means that games can for example be transferred
+ between different chess clubs, furthermore, if cheating takes place, corruption
+ can only occur in the particular table where it was found, and can not
+ spread.
+\end_layout
+
+\begin_layout Standard
+Moving chess players from one location to another is one of the alterations
+ made to the real world chess club system to make the system more appropriate
+ for a software setting.
+ Allowing games to be transferred is not a property usually desired in a
+ real world chess club, where transferring players would mean moving the
+ players from one building to another.
+ In the software setting, moving players means moving the game processes
+ from one system to another, perhaps to balance the system load.
+ This transfer of players can occur transparently, without notifying the
+ players.
+\end_layout
+
+\begin_layout Standard
+The simplified life cycle of a game in GGS can be viewed using algorithm
+ 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "alg:game-lifecycle"
+
+\end_inset
+
+.
+ In order to make this life cycle as efficient and useful as possible, the
+ scalability, fault tolerant and generic traits are added to the GGS.
+ These are not shown in the algorithm, as these traits are tools in making
+ the algorithm behave as efficient as possible, and are not the main focus
+ when studying the life cycle of a game.
+\end_layout
+
+\begin_layout Standard
+The limits imposed in 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "alg:game-lifecycle"
+
+\end_inset
+
+ are arbitrary for this example, there are no limits in the GGS on the number
+ of players connecting, for example.
+\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
+begin{algorithmic}[1]
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+newcommand{
+\backslash
+INDSTATE}[1][1]{
+\backslash
+STATE
+\backslash
+hspace{#1
+\backslash
+algorithmicindent}}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+STATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+while
+\series default
+ 
+\begin_inset Formula $players<2$
+\end_inset
+
+:
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+if
+\series default
+ a player connects, call 
+\emph on
+connected
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+STATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+while 
+\series default
+the game commences:
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+call the function 
+\emph on
+game
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+STATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+when
+\series default
+ the game has stopped
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+call the function 
+\emph on
+endGame
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+STATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+function 
+\series default
+connected:
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+assign the new player an id
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+alert the coordinator of the new player
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+if
+\series default
+ a free table does not exist:
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE[2] 
+\end_layout
+
+\end_inset
+
+the coordinator creates a new table 
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+the coordinator places the player by the table, and begins watching the
+ player
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+STATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+function
+\series default
+ game
+\series bold
+:
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+ perform game-specific functions.
+ In chess, the rules of chess are placed here
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+STATE 
+\end_layout
+
+\end_inset
+
+
+\series bold
+function 
+\series default
+endGame:
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+alert the coordinator, de-registering the players
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+INDSTATE 
+\end_layout
+
+\end_inset
+
+disconnect the players from the system, freeing system resources
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+end{algorithmic}
+\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:game-lifecycle"
+
+\end_inset
+
+A very simple example of the flow through the GGS system when a game played.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+
+\end_layout
+
+\begin_layout Section
+Performance
+\end_layout
+
+\begin_layout Standard
+There are many ways in which performance could be measured.
+ For the clients, time and response times are useful measurements in time
+ critical settings.
+ In non-time critical settings, the reliability of message delivery may
+ be an even more important factor than speed.
+\end_layout
+
+\begin_layout Standard
+In a first person shooter game, the speed of delivery of messages is essential.
+ Failiure to deliver messages in time results in choppy gameplay for the
+ players.
+ In strategy games, the reliability of delivery may be more important than
+ the speed, since the game is not percieved as choppy even if the messages
+ are delayed.
+\end_layout
+
+\begin_layout Standard
+For someone operating a GGS, it is perhaps more interesting to measure the
+ system load, memory consumption, energy consumption and network saturation.
+ These topics are discussed in theory in this section.
+ The practical results for the prototype are discussed in chapter 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "cha:Implementation-of-a"
+
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Subsection
+Performance measurements
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Tue apr 26, 9:15.
+ Continue from here on.
+ Discuss which results we may expect in a fully fledged GGS system.
+ What impedes the speeds, what raises the CPU load (and therefore the temperetur
+es & power consumption).
+ What factors are there in the network saturation problem?
+\end_layout
+
+\begin_layout Plain Layout
+Which games are affected by what, and what does this mean for the number
+ of players a GGS can handle?
+\end_layout
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
@@ -818,6 +1873,13 @@ Find reference on how to benchmark distributed, multiprocess systems
 
 \begin_layout Section
 Choice of network protocol
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:Choice-of-network"
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
@@ -915,15 +1977,47 @@ Same here it is simply not true for a generic server to chose one or the
 \end_layout
 
 \begin_layout Section
-Fault Tolerance
+Generic
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:Generic"
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
-Fault tolerance is an important factor in all servers; a server that is
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Bad name of the chapter, but here we should give the theory of how the server
+ is generic
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Section
+Fault Tolerance
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:Fault-Tolerance"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Fault tolerance is an important factor in all servers, a server that is
  fault tolerant should be able to follow a given specification when parts
  of the system failures.
  This means that fault tolerance is different in each system depending on
- what specification the system have.
+ what specification they have.
  A system could be fault tolerant in different aspects, one is where the
  system is guaranteed to be available but not safe and it could also be
  reversed, that the system is safe but not guaranteed to be available.
@@ -952,11 +2046,11 @@ In order to make the GGS prototype fault tolerant the programming language
 
 \begin_layout Standard
 The need for fault tolerance in game servers is not as obvious as it may
- be for other types of servers.
+ be for other typ of servers.
  In general all servers strive to be fault tolerant as fault tolerance means
  more uptime and a safer system.
- This applies to game servers as well, in brief good fault tolerance is
- a way of satisfying customers.
+ This applies to game servers aswell, in brief good fault tolerance is a
+ way of satisfying customers.
  In general, game servers differ from many other fault tolerant systems
  in that high-availability is more important than the safety of the system.
  For example a simple calculation error will not be critical for a game
@@ -971,14 +2065,21 @@ Performance penalties
 \end_layout
 
 \begin_layout Section
-Availability 
+Availability
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:Availability"
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
 One important factor of any server is the availability.
  A server to which you are unable to connect to is a useless server.
- Other then within telecommunication, their uptime is of about 99,9999999%,
- the game developer community hasn't approached this problem very genuinely
+ Other then within telecomunication, their uptime is of about 99,9999999%,
+ the game developer community hasn't approched this problem very genuinely
  yet so there is much room for improvement.
 \end_layout
 
@@ -1019,7 +2120,14 @@ messages
 \end_layout
 
 \begin_layout Section
-Scalability 
+Scalability
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:Scalability"
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
@@ -1035,7 +2143,7 @@ Each instance of the GGS contains several tables.
  down at a new table, all within the same game session.
  With this in mind, the main focus of the GGS is not to move players between
  tables, but to keep a player in a table, and to start new tables instead.
- When a server has reached a certain number of players the performance will
+ When a server has reached a certain amount of players the performance will
  start to decrease.
  To avoid this the GGS will start new tables on another server, using this
  technique the players will be close to evenly distributed between the servers.
@@ -1143,7 +2251,7 @@ UUID
 \begin_inset Float algorithm
 wide false
 sideways false
-status collapsed
+status open
 
 \begin_layout Plain Layout
 \begin_inset ERT
@@ -1432,7 +2540,7 @@ reference "alg:A-simple-generator"
 \begin_inset Float figure
 wide false
 sideways false
-status open
+status collapsed
 
 \begin_layout Plain Layout
 \begin_inset ERT
@@ -1481,7 +2589,7 @@ end{centering}
 status open
 
 \begin_layout Plain Layout
-Add clients on each side, and replace the cloud with pole-landlines being
+Add clients on each side, and replace the cloud with phole-landlines being
  cut by a pair of scissors
 \end_layout
 
@@ -1518,7 +2626,7 @@ Security
 \end_layout
 
 \begin_layout Standard
-The project only support languages running in a sandboxed environment.
+We only support languages running in a sandboxed environment.
  Each game session is started in its own sandbox.
  The sandboxing isolates the games in such a way that they can not interfere
  with each other.
@@ -1543,11 +2651,11 @@ Game Development Language in a Virtual Machine
 There is only a very limited number of game developers who would like to
  write their games in Erlang, therefore we had to come up with something
  to resolve this problem.
- The main idea was to offer a replaceable module which would introduce a
+ The main idea was to offer a replacable module which would introduce a
  interface to different virtual machines which would run the game code.
- This way a game developer can write the game in his favorite language while
- the server part still is written in Erlang and can benefit from all of
- its advantages.
+ This way a game developer can write the game in his favourite language
+ while the server part still is written in Erlang and can benefit from all
+ of its advantages.
 \end_layout
 
 \begin_layout Subsection
@@ -1709,40 +2817,21 @@ number of clients
 \end_layout
 
 \begin_layout Chapter
-Implementation
-\begin_inset Note Note
-status collapsed
-
-\begin_layout Plain Layout
-Perhaps call this 
-\begin_inset Quotes eld
-\end_inset
-
-realization
-\begin_inset Quotes erd
-\end_inset
-
- or 
-\begin_inset Quotes eld
-\end_inset
-
-implementation
-\begin_inset Quotes erd
-\end_inset
-
-
-\end_layout
+Implementation of a prototype
+\begin_inset CommandInset label
+LatexCommand label
+name "cha:Implementation-of-a"
 
 \end_inset
 
- 
+
 \end_layout
 
 \begin_layout Standard
-This chapter contains the realization of many of the principles and techniques
+This chapter contains the realization of much of the principles and techniques
  described in chapter 
 \begin_inset CommandInset ref
-LatexCommand ref
+LatexCommand vref
 reference "cha:Theory"
 
 \end_inset
@@ -1764,6 +2853,577 @@ and distribution of erlang nodes on physical nodes.
  with third parties are also discussed here.
 \end_layout
 
+\begin_layout Section
+Overview of the prototype
+\end_layout
+
+\begin_layout Standard
+The prototype of the GGS was developed using the Erlang language.
+ The functional and concurrent style of Erlang facilitates devlopment of
+ software based on a real-world model 
+\begin_inset CommandInset citation
+LatexCommand citep
+key "armstrong2011"
+
+\end_inset
+
+.
+ In Erlang, most things are processes.
+ The software running the Erlang code is known as the Erlang machine, or
+ an Erlang node.
+ Each Erlang node is capable of running several 
+\emph on
+threads 
+\emph default
+(also known as 
+\emph on
+Light Weight Processes; LWP
+\emph default
+)
+\emph on
+, 
+\emph default
+much like the threads in an operating system.
+ Threads in a Linux system, for example, are treated much like operating
+ system processes in different systems.
+ Due to the size of datastructures related to each process, swapping one
+ process for another (known as 
+\emph on
+context switching
+\emph default
+) is an expensive task in many systems.
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Citation needed, perhaps the book for the 
+\emph on
+Unix Internals
+\emph default
+ course?
+\end_layout
+
+\end_inset
+
+ 
+\end_layout
+
+\begin_layout Standard
+The cost of swapping operating system processes becomes a problem when many
+ processes are involved.
+ If the GGS system had been developed using regular operating system processes,
+ it would have had to be designed in a way to minimize the number of processes.
+ Using Erlang, which is capable of running very many processes, several
+ times more than an operating system can, the mapping between the real world
+ system (described in 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "sec:Design-of-the"
+
+\end_inset
+
+) becomes clearer.
+\end_layout
+
+\begin_layout Standard
+Erlang allows the GGS to create several process for each player connecting,
+ these processes can handle a multitude of different tasks, parsing data
+ for example.
+ Since each task is handled by a different process, the tasks are clearly
+ separated and the failiure of one is easily recovered without affecting
+ the others.
+\end_layout
+
+\begin_layout Standard
+In addition to creating (or 
+\emph on
+spawning
+\emph default
+) processes specifically to handle new players connecting, the GGS has more
+ permanent processes running at all times.
+ The constantly running processes in the GGS system are called 
+\emph on
+modules
+\emph default
+.
+ An example of a module in the GGS is the 
+\emph on
+dispatcher module
+\emph default
+, which handles the initial connection made by a client, passing the connection
+ along further in to the system.
+\end_layout
+
+\begin_layout Standard
+\begin_inset Float figure
+wide false
+sideways false
+status collapsed
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+begin{centering}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset Graphics
+	filename graphics/Chess_no_text.eps
+	width 100text%
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+end{centering}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Plain Layout
+\begin_inset Caption
+
+\begin_layout Plain Layout
+\begin_inset CommandInset label
+LatexCommand label
+name "fig:The-layout-of"
+
+\end_inset
+
+The layout of the GGS.
+ The circles marked with 'C' topmost in the picture represent clients.
+ The cloud marked 'network' pictured directly below the clients can be any
+ network, for example the Internet.
+ The barell figure marked 'backup' is a process being fed backup data from
+ the coordinator.
+ The barell marked 'State' contains the state of a table, and this is fed
+ into the box marked 'Mnesia' which is database.
+ Finally the figure shaped as a shield marked 'GameVM' contains the actual
+ game process.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+In figure
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "fig:The-layout-of"
+
+\end_inset
+
+ the entire GGS system is represented graphically.
+ The circles marked with 'C' topmost in the picture represent game clients.
+ These circles represent processes running on gamers' computers, and not
+ on the GGS machine.
+ If a game of chess is to be played on the server, the clients on the gamers'
+ machines will be chess game clients.
+ Clients connect through a network, pictured as a cloud, to the dispatcher
+ process in the GGS.
+ The dispatcher process and all other modules are discussed in
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "sec:The-modular-structure"
+
+\end_inset
+
+.
+ For each connection, a new player process is spawned, which immediately
+ after spawning is integrated in to the GGS by the coordinator process.
+\end_layout
+
+\begin_layout Section
+The usage of Erlang in the GGS
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Here we can have a more in-depth look at why Erlang was used, and outline
+ the characteristics of EWrlang that we make use of in the GGS.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Section
+The modular structure of the GGS prototype
+\begin_inset CommandInset label
+LatexCommand label
+name "sec:The-modular-structure"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+The separation of concerns, and principle of single responsibility 
+\begin_inset Foot
+status collapsed
+
+\begin_layout Plain Layout
+More information on the SRP is available at: 
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Insert adress!
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+ are widely respected as good practices in the world of software engineering
+ and development.
+ By dividing the GGS up into modules each part of the GGS can be modified
+ without damaging the rest of the system.
+\end_layout
+
+\begin_layout Standard
+The responsibility and concern of each module comes from the responsibility
+ and concern of the real-world entity the model represents.
+ The modelling of the GGS after a real world system was discussed in chapter
+ 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "cha:Theory"
+
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Standard
+In the text below the word module refers to the actual code of the discussed
+ feature, while the word process is used when referring to a running instance
+ of the code.
+ Those familiar to object oriented programming may be helped by thinking
+ in the lines of classes and objects.
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Am I right here?
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Subsection
+The dispatcher module
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+The discussion of the modules is divided into the following parts:
+\end_layout
+
+\begin_layout Itemize
+What does the module do?
+\end_layout
+
+\begin_layout Itemize
+What happens when the module fails?
+\end_layout
+
+\begin_layout Itemize
+How does the module correspond to the real-world scenario of the chess club?
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+The dispatcher module is the first module to have contact with a player.
+ When a player connects to the GGS, it is first greeted by the dispatcher
+ module, which sets up an accepting socket for each player.
+ 
+\begin_inset Note Note
+status collapsed
+
+\begin_layout Plain Layout
+Is this the proper way to day the dispatcher greets connecting players?
+\end_layout
+
+\end_inset
+
+ The dispatcher is the module which handles the interfacing to the operating
+ system when working with sockets.
+ Operating system limits concering the number of open files, or number of
+ open sockets are handled here.
+ The operating system limits can impose problems on the GGS, this is discussed
+ more in detail in chapter 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "cha:Problems-of-implementation"
+
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Standard
+Should the dispatcher module fail to function, no new connections to the
+ GGS can be made.
+ In the event of a crash in the dispatcher module, a supervisor process
+ immediately restarts the dispatcher.
+ There exists a window of time between the crashing of the dispatcher and
+ the restarting of the dispatcher, this window is very short, and only during
+ this window is the GGS unable to process new connection requests.
+ Due to the modular structure of the GGS, the rest of the system is not
+ harmed by the dispatcher process not functioning.
+ The process does not contain a state, therefore a simple restart of the
+ process is sufficient in restoring the GGS to a pristine state after a
+ dispatcher crash
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Well..
+ In theory..
+\end_layout
+
+\end_inset
+
+.
+\end_layout
+
+\begin_layout Standard
+Returning to scenario of the chess club, the dispatcher module is the doorman
+ of the club.
+ When a player enters the chess club, the player is greeted by the doorman,
+ letting the player in to the club.
+ The actual letting in to the club is in the GGS represented by the creation
+ of a player process discussed in 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "sub:The-player-module"
+
+\end_inset
+
+.
+ The newly created player process is handed, and granted rights to, the
+ socket of the newly connected player.
+\end_layout
+
+\begin_layout Subsection
+The player module
+\begin_inset CommandInset label
+LatexCommand label
+name "sub:The-player-module"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+The player module is responsible for representing a player in the system.
+ Each connected player has its own player process.
+ The player process has access to the connection of the player it represents,
+ and can communicate with this player.
+ In order to communicate with a player, the data to and from the player
+ object must pass through a protocol parser module, discussed in 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "sub:The-protocol-parser"
+
+\end_inset
+
+.
+ Raw communication, witout passing the data through a protocol parser is
+ in theory possible, but is not useful.
+\end_layout
+
+\begin_layout Standard
+In the creation of a player process, the coordinator process, discussed
+ in 
+\begin_inset CommandInset ref
+LatexCommand vref
+reference "sub:The-coordinator-module"
+
+\end_inset
+
+, is notified by the newly connected process.
+\end_layout
+
+\begin_layout Standard
+In the event of a crash in a player process, several things happen.
+ 
+\end_layout
+
+\begin_layout Enumerate
+The player process, which is the only process with a reference to the socket
+ leading to the remote client software, passes this reference of the socket
+ to the coordinator process temporarily.
+\end_layout
+
+\begin_layout Enumerate
+The player process exits.
+\end_layout
+
+\begin_layout Enumerate
+The coordinator spawns a new player process, with the same socket reference
+ as the old player process had.
+\end_layout
+
+\begin_layout Enumerate
+The player process resumes operation, immediately starting a new protocol
+ parser process, and begind receiving and sending network messaged again.
+\end_layout
+
+\begin_layout Standard
+The window of time between the crash of the player process and the starting
+ of a new player process is, as with the dispatcher, very short.
+ Since the connection changes owners for a short period of time, but is
+ never dropped, the implications of a crash are only noticed, at worst,
+ as choppy gameplay for the client.
+ Note however that this crash recovery scheme is not implemented in the
+ GGS prototype.
+ 
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Can we do this..? Seems a bit sneaky.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Moving back to the real world example, the player process represent an actual
+ person in the chess club.
+ When a person sits down at a table in the chess club, the person does so
+ by requesting a seat from some coordinating person, and is then seated
+ by the same coordinator.
+ Once seated, the player may make moves on the table he or she is seated
+ by, this corresponds clearly to how the GGS is structured, as can be seen
+ in the following sections.
+\end_layout
+
+\begin_layout Subsection
+The protocol parser module
+\begin_inset CommandInset label
+LatexCommand label
+name "sub:The-protocol-parser"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+The protocol parser is an easily interchangable module in the GGS, handling
+ the client-to-server, and server-to-client protocol parsing.
+ In the GGS prototype, there is only one protocol supported, namely the
+ 
+\emph on
+GGS Protocol
+\emph default
+.
+ The role of the protocol parser is to translate the meaning of packets
+ sent using the prototocol in use to internal messages of the GGS system.
+ The GGS protocol, discussed below is used as a sample protocol in order
+ to explain how protocol parsers can be built for the GGS.
+\end_layout
+
+\begin_layout Subsubsection
+The structure of the GGS Protocol
+\begin_inset CommandInset label
+LatexCommand label
+name "sub:The-structure-of"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+Mention that the protocol is heavily influenced bye HTTP, is parsed using
+ a FSM, perhaps give a sample packet.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Subsection
+The coordinator module
+\begin_inset CommandInset label
+LatexCommand label
+name "sub:The-coordinator-module"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Subsection
+The table module
+\end_layout
+
+\begin_layout Subsection
+The game virtual machine module
+\end_layout
+
+\begin_layout Subsection
+The database module
+\end_layout
+
 \begin_layout Section
 Techniques for ensuring reliability 
 \end_layout
@@ -1772,7 +3432,7 @@ Techniques for ensuring reliability
 One of the main goals of the project is to achieve high reliability.
  A highly reliable application is one that crashes very, very rarely 
 \begin_inset Note Note
-status collapsed
+status open
 
 \begin_layout Plain Layout
 CITATION NEEDED
@@ -1818,6 +3478,16 @@ d reliability systems in Erlang.
 
 \begin_layout Subsection
 Supervisor structure 
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
+This entire section is bad.
+\end_layout
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
@@ -1853,7 +3523,7 @@ In Erlang, we have a simple version of supervisors.
 \end_layout
 
 \begin_layout Standard
-When the linking of processes in order to monitor exit behavior is coupled
+When the linking of processes in order to monitor exit behaviour is coupled
  with the transparent distribution of Erlang, a very powerful supervision
  system is created.
  For instance, we can restart a failing process on a different, new node,
@@ -1862,7 +3532,7 @@ When the linking of processes in order to monitor exit behavior is coupled
 \end_layout
 
 \begin_layout Standard
-In the GGS, we have separated the system into two large supervised parts.
+In the GGS, we have separated the system in to two large supervised parts.
  We try to restart a crashing child separately, if this fails too many
 \begin_inset Foot
 status collapsed
@@ -1888,7 +3558,7 @@ too many
 \begin_inset Float figure
 wide false
 sideways false
-status collapsed
+status open
 
 \begin_layout Plain Layout
 \begin_inset Note Note
@@ -2009,7 +3679,14 @@ User interface
 \end_layout
 
 \begin_layout Chapter
-Problems 
+Problems of implementation
+\begin_inset CommandInset label
+LatexCommand label
+name "cha:Problems-of-implementation"
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Section
@@ -2017,20 +3694,20 @@ erlang_js
 \end_layout
 
 \begin_layout Standard
-To be able to run JavaScript on the server there was a need to embed a JavaScrip
-t engine within the server.
- After a thorough investigation erlang_js became the choice.
+To be able to run JavaScript on our server we needed to embed a JavaScript
+ engine within the server.
+ After a thorough investigation erlang_js became our choice.
  Erlang_js provides direct communication with a JavaScript VM (Virtual Machine).
- This was exactly what was wanted, but there was also a need to communicate
- from erlang_js to Erlang.
+ This was exactly what we wanted, but we also needed the possibility to
+ communicate from erlang_js to Erlang.
  This functionality was not yet implemented in erlang_js, due to lack of
  time.
 \end_layout
 
 \begin_layout Standard
 There were two possible solutions to the problem.
- To rewrite some part of erlang_js, or to switch erlang_js for some other
- JavaScript engine.
+ We could rewrite some part of erlang_js, or we could switch erlang_js for
+ some other JavaScript engine.
  Searching for other engines we found erlv8 and beam.js which provided the
  functionality that we wanted.
  As we tested beam.js it occurred random crashes of the whole Erlang environment.
@@ -2072,7 +3749,7 @@ Design choices
 
 \begin_layout Standard
 When designing concurrent applications, it is useful to picture them as
- real world scenarios, and to model each actor# as a real world process.
+ real world scenarios, and to model each actor as a real world process.
  A real world process is a process which performs some action in the real
  world, such as a mailbox receiving a letter, a door being opened, a person
  translating a text, a soccer player kicking the ball, just to name a few
@@ -2158,68 +3835,6 @@ Coordinator
 \emph default
  rounding up all the tables, running to a new location and building the
  club up in the exact state it was prior to the fire.
-\begin_inset Float figure
-wide false
-sideways false
-status collapsed
-
-\begin_layout Plain Layout
-\begin_inset ERT
-status open
-
-\begin_layout Plain Layout
-
-
-\backslash
-begin{centering}
-\end_layout
-
-\end_inset
-
-
-\end_layout
-
-\begin_layout Plain Layout
-\begin_inset Graphics
-	filename graphics/Chess_no_text.eps
-	width 100text%
-
-\end_inset
-
-
-\end_layout
-
-\begin_layout Plain Layout
-\begin_inset ERT
-status open
-
-\begin_layout Plain Layout
-
-
-\backslash
-end{centering}
-\end_layout
-
-\end_inset
-
-
-\end_layout
-
-\begin_layout Plain Layout
-\begin_inset Caption
-
-\begin_layout Plain Layout
-The layout of GGS
-\end_layout
-
-\end_inset
-
-
-\end_layout
-
-\end_inset
-
-
 \end_layout
 
 \begin_layout Section
@@ -2325,6 +3940,18 @@ The GGS doesn't support many programming languages nor does it have a complete
 Conclusion
 \end_layout
 
+\begin_layout Chapter*
+Glossary
+\end_layout
+
+\begin_layout Standard
+Here we could add some important words and their definitions..
+\end_layout
+
+\begin_layout Standard
+
+\end_layout
+
 \begin_layout Standard
 \begin_inset CommandInset bibtex
 LatexCommand bibtex