1.
.Net in Social Gamingby Yan Cui @theburningmonk theburningmonk.com

2.
Name : Yan CuiIndustry : Social Gaming

3.
• Social Gaming division of GameSys• .Net backend (mostly)• Amazon Web Services

4.
• Top 30 grossing FB apps!• F# slots engine

5.
Architecture Highlights

6.
• Clients  Flash  iOS (objective-C & Lua)

7.
• Web Servers  Written in C#  WCF with custom AMF binding  Hosted in Amazon EC2

8.
• Messaging  Amazon SQS  Distributed  Highly scalable  Unordered delivery

9.
• Monitoring  Method exec time/count  Error count  AOP to capture performance metrics  Amazon CloudWatch

10.
• Slots Engine  Written in F#  The ‘brain’  Enforces game rules and maths model

11.
• Persistence  Hot data  Cold data

12.
Considerations

13.
• Ease of use/maintenance• Cost• Speed• Ability to handle size• Ability to handle volume of transactions• Eventual/Strong consistency• Replication• ...

14.
Choices (just to name a few...)

15.
So many considerations...so many choices...

16.
Different data = different requirements

17.
Different data = different requirements

18.
Polyglot Persistence!

19.
• Amazon SimpleDB• Amazon DynamoDB• CouchBase• Amazon S3• MySql via Amazon RDS• Google High Replication Data Store• Google Cloud Storage

20.
Scalability Challenge

21.
• 150 million requests/day  15x StackOverflow!

22.
• 10s of GBs of analytics data/day  Google BigQuery  A/B testing

23.
• 2500 requests / second  100+ commodity servers  Stateless servers

24.
• 15K IO ops / second  Protocol-Buffer  5x faster than BinaryFormatter  60% smaller payload

25.
Where F# comes in

26.
Special Symbol CollectablesAvg Wager Size Wager Size Web Server call

27.
• Line Win  X number of matching symbols on adjacent columns  Positions have to be a ‘line’  Wild symbols substitute for other symbols

28.
• Scatter Win  X number of matching symbols anywhere  Triggers bonus game

29.
What’s the player’s What symbols should land? new avg wager? What lines did the player bet on? How much did the player wager? Did the player win anything? Any special symbol wins? Should the player receive collectables?

30.
State representation

31.
New avg wager Got a Collectable! A pay line win!

32.
Bonus Game!Betting small reduces avg wager!

33.
Use collectables

34.
Representing Monopoly board

35.
Collected in the bonus game. Gives player extra ‘lives’. And a pay line win! Houses = multiplier on wins GAME OVERCoin size broughtover from main game

36.
Thank You! @theburningmonktheburningmonk.com

37.
Bingo.nethttp://apps.facebook.com/ilovebingoSuper Fun Townhttp://apps.facebook.com/superfuntownJackpot Joy Slotshttp://apps.facebook.com/jackpotjoyslotsLucky Gem Casinohttp://apps.facebook.com/luckygemcasinoJackpot Joy Casinohttp://apps.facebook.com/jackpotjoycasino