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F#in
 the
Real
 World
Hi, my name is Yan Cui.
agenda
Domain Modelling!
Infrastructure!
Game Logic!
Algorithms!
DSLs
1MILLION USERS
ACTIVE
DAILY
250MILLION DAY
PER
REQUEST
2MONTH
TB
P E R
sec
ops
25,000
we are polyglot
C#
why F#?
time to market
correctness
efficient
tame complexity
Collectables
Wager Size
Special Symbol
Avg Wager Size
Web Server call
• Line Win!
– X number of matching symbols on adjacent columns!
– Positions have to be a ‘line’!
– Wild symbols substitute for other symbols!
!
• Scatter Win!
– X number of matching symbols anywhere!
– Triggers bonus game
What symbols should land?!
Any special symbol wins?!
Did the player win anything?
What the player’s new
average wager?
Should the player receive
collectables?
type Symbol = Standard! of string!
! ! ! | Wild
type Symbol = Standard! of string!
! ! ! | Wild
e.g.! Standard “hat”!
! Standard “shoe”!
! Standard “bonus”!
! …
type Symbol = Standard! of string!
! ! ! | Wild
i.e.! Wild
!
!
!
type Win = LineWin of int * Symbol * int!
! | ScatterWin of Symbol * int
!
!
!
type Win = LineWin of int * Symbol * int!
! | ScatterWin of Symbol * int
e.g.! LineWin (5, Standard “shoe”, 4)
!
!
!
type Win = LineWin of int * Symbol * int!
! | ScatterWin of Symbol * int
e.g.! ScatterWin (Standard “bonus”, 3)
type LineNum = int!
type Count! = int!
!
type Win = LineWin of LineNum * Symbol * Count!
! | ScatterWin of Symbol * Count
closed hierarchy
no Nulls
make invalid states
unrepresentable
[Measure]!
type Pence
e.g.! 42Pence!
! 153Pence!
! …
10Meter / 2Second ! = 5Meter/Second!
10Meter * 2Second ! = 20Meter Second !
10Meter + 10Meter ! = 20Meter!
10Meter * 10! ! ! = 100Meter!
10Meter * 10Meter ! = 100Meter2!
10Meter + 2Second ! // error!
10Meter + 2 ! ! ! // error
10Meter / 2Second ! = 5Meter/Second!
10Meter * 2Second ! = 20Meter Second !
10Meter + 10Meter ! = 20Meter!
10Meter * 10! ! ! = 100Meter!
10Meter * 10Meter ! = 100Meter2!
10Meter + 2Second ! // error!
10Meter + 2 ! ! ! // error
type Wager = int64Pence!
type Multiplier = int!
!
type Payout = Coins! of Wager!
! ! | MultipliedCoins of Multiplier * Wager!
! ! | Multi! of Payout list!
! ! | BonusGame
type Wager = int64Pence!
type Multiplier = int!
!
type Payout = Coins! of Wager!
! ! | MultipliedCoins of Multiplier * Wager!
! ! | Multi! of Payout list!
! ! | BonusGame
type Wager = int64Pence!
type Multiplier = int!
!
type Payout = Coins! of Wager!
! ! | MultipliedCoins of Multiplier * Wager!
! ! | Multi! of Payout list!
! ! | BonusGame
type State = !
{!
AvgWager! : Wager!
SpecialSymbol : Symbol!
Collectables : MapCollectable, Count!
}
immutable by default
Recap
lightweight syntax
for types 
hierarchies
great for domain
modelling
make invalid states
unrepresentable
better correctness
order of magnitude
increase in productivity
player states are big
Stateless Server DatabaseClient
1:1 read-write ratio
ServerClient
Session 1
Session 2
ServerClient Database
Elastic Load Balancer
S3
Auto scaling Group
Server A Server B
...
EC2
CloudFront
Stateful Server
The Actor Model
An actor is the fundamental unit of computation
which embodies the 3 things!
• Processing!
• Storage!
• Communication!
that are essential to computation.!
!
-Carl Hewitt*
* http://bit.ly/HoNHbG
The Actor Model
• Everything is an actor!
• An actor has a mailbox!
• When an actor receives a message it can:!
– Create new actors!
– Send messages to actors!
– Designate how to handle the next message
Stateful Server
• Gatekeeper!
– Manages the local list of active workers!
– Spawns new workers!
!
• Worker!
– Manages the states for a player!
– Optimistic locking!
– Persist state after period of inactivity
Stateful Server
Game Server
Player A
Player B
S3
Worker C
Worker B
Gatekeeper
RequestHandlers
Asynchronous
Stateful Server
Game Server
Worker C
Worker B
Gatekeeper
Worker A
ok
RequestHandlers
Player A
Player B
Asynchronous
S3
Stateful Server
Game Server
S3
Worker C
Worker B
Gatekeeper
Worker A
RequestHandlers
Player A
Player B
Asynchronous
Stateful Server
Game Server
S3
Worker C
Gatekeeper
Worker A
RequestHandlers
Player A
Player B
Asynchronous
Stateful Server
Game Server
Worker C
Worker A
Gatekeeper
error
RequestHandlers
Player A
Player B
S3
Asynchronous
type Agent‘T = MailboxProcessor‘T!
!
!
!
type Agent‘T = MailboxProcessor‘T!
!
type Message = !
| Get of AsyncReplyChannel…!
| Put of State * Version * AsyncReplyChannel…
type Agent‘T = MailboxProcessor‘T!
!
type Message = !
| Get of AsyncReplyChannel…!
| Put of State * Version * AsyncReplyChannel…
type Result‘T =!
| Success! of ’T!
| Failure! of Exception!
!
!
!
type Result‘T =!
| Success! of ’T!
| Failure! of Exception!
!
type GetResult = ResultState * Version!
type PutResult = Resultunit!
type Agent‘T = MailboxProcessor‘T!
!
type Message = !
| Get of AsyncReplyChannelGetResult!
| Put of State * Version * AsyncReplyChannelPutResult
type Agent‘T = MailboxProcessor‘T!
!
type Message = !
| Get of AsyncReplyChannelGetResult!
| Put of State * Version * AsyncReplyChannelPutResult
type Worker (playerId) =!
let agent = AgentMessage.Start(fun inbox -!
let state = getCurrentState playerId!
!
let rec workingState (state, version) = !
async { … }!
and closedState () =!
async { … }!
!
workingState (state, 1))
type Worker (playerId) =!
let agent = AgentMessage.Start(fun inbox -!
let state = getCurrentState playerId!
!
let rec workingState (state, version) = !
async { … }!
and closedState () =!
async { … }!
!
workingState (state, 1))
type Worker (playerId) =!
let agent = AgentMessage.Start(fun inbox -!
let state = getCurrentState playerId!
!
let rec workingState (state, version) = !
async { … }!
and closedState () =!
async { … }!
!
workingState (state, 1))
type Worker (playerId) =!
let agent = AgentMessage.Start(fun inbox -!
let state = getCurrentState playerId!
!
let rec workingState (state, version) = !
async { … }!
and closedState () =!
async { … }!
!
workingState (state, 1))
type Worker (playerId) =!
let agent = AgentMessage.Start(fun inbox -!
let state = getCurrentState playerId!
!
let rec workingState (state, version) = !
async { … }!
and closedState () =!
async { … }!
!
workingState (state, 1))
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
| None - !
do! persist state!
return! closedState()!
…!
}!
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
| None - !
do! persist state!
return! closedState()!
…!
}!
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
| None - !
do! persist state!
return! closedState()!
…!
}!
non-blocking I/O
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
| None - !
do! persist state!
return! closedState()!
…!
}!
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
| None - !
do! persist state!
return! closedState()!
…!
}!
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
…!
| Some(Get(reply)) -!
reply.Reply | Success(state, version)!
return! workingState(state, version)!
…!
}!
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
…!
| Some(Put(newState, v, reply)) when version = v -!
reply.Reply | Success()!
return! workingState(newState, version+1)!
…!
}
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
…!
| Some(Put(_, v, reply)) -!
reply.Reply | Failure(VersionMismatch(version, v))!
return! workingState(state, version)!
}
let rec workingState (state, version) = !
async { !
let! msg = inbox.TryReceive(60000)!
match msg with!
| None ! ! ! ! ! ! - …!
| Some(Get(reply)) ! ! ! ! - …!
| Some(Put(newState, v, reply)) when version = v - …!
| Some(Put(_, v, reply)) ! ! ! - …!
}
and closedState () = !
async { !
let! msg = inbox.Receive()!
match msg with!
| Get(reply) -!
reply.Reply | Failure(WorkerStopped)!
return! closedState()!
| Put(_, _, reply) -!
reply.Reply | Failure(WorkerStopped)!
return! closedState()!
}
and closedState () = !
async { !
let! msg = inbox.Receive()!
match msg with!
| Get(reply) -!
reply.Reply | Failure(WorkerStopped)!
return! closedState()!
| Put(_, _, reply) -!
reply.Reply | Failure(WorkerStopped)!
return! closedState()!
}
5x efficient
improvement
60% latency drop
no databases
90% cost saving
Recap
Agents!
• no locks!
• async message passing!
!
Agents!
• no locks!
• async message passing!
• self-contained!
• easy to reason with
Cricket
akka.Net
Orleans
Async Workflow!
• non-blocking I/O!
• no callbacks
Pattern Matching!
• clear  concise
Caught a Gnome
EXP Item Gold
Quest Progress
Caught a Gnome
Level Up
Quest Progress
EXP Item Gold
Caught a Gnome
Quest Complete
Level Up
Quest Progress
EXP Item Gold
Caught a Gnome
New Quest
Quest Complete
Quest Progress
EXP Item Gold
Caught a Gnome
Quest Complete
New Quest
Level Up
Quest Progress
New Quest
Achievement
Progress
EXP Item Gold
Quest Complete
Level Up
Caught a Gnome
Level Up
Quest Progress
EXP Item Gold
Caught a Gnome
Quest Complete
New Quest
Achievement
Progress
Achievement
Complete
Level Up
Quest Progress
EXP Item Gold
Caught a Gnome
Quest Complete
New Quest
Achievement
Progress
Achievement
Complete
100+ actions
triggered by different
abstraction layers
non-functional
requirements
message-broker
pattern
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
Ignore
Process
Process
Process
Process
Ignore
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
EXP
Item
Gold
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
EXP
Item
Gold
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
EXP
Item
Gold
Process
Ignore
Ignore
Ignore
Process
Ignore
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
EXP
Item
Gold
Level Up
Caught Gnome Trapping
Queue
Levelling
Quests
Achievements
Analytics
Partner
Reporting
EXP
Item
Gold
Level Up
need lots of facts
type Fact =!
| GotExp! ! of Exp!
| GotGold! ! of Gold!
| GotItem! ! of Item * Count!
| CaughtMonster! of Monster * Bait * Location!
| LevelUp! ! of OldLevel * NewLevel!
…
type Reward =!
| GotExp! ! of Exp!
| GotGold! ! of Gold!
| GotItem! ! of Item * Count!
!
type StateChange =!
| LevelUp! ! of OldLevel * NewLevel!
…
type Fact =!
| StateChange! of StateChange!
| Reward! ! of Reward!
| Trapping! ! of Trapping!
| Fishing! ! of Fishing!
…
let process fact =!
match fact with!
| StateChange(stateChange)! - …!
| Reward(reward)! ! ! - …!
| Trapping(trapping)! ! - …!
…
C# interop
…!
var fact = Fact.NewStateChange(!
! StateChange.NewLevelUp(oldLvl, newLvl));!
…
type IFact = interface end!
!
type Reward =!
| GotExp! ! of Exp!
| GotGold! ! of Gold!
| GotItem! ! of Item * Count!
interface IFact
type IFact = interface end!
!
type Reward =!
| GotExp! ! of Exp!
| GotGold! ! of Gold!
| GotItem! ! of Item * Count!
interface IFact
let process (fact : IFact) =!
match fact with!
| :? StateChange ! as stateChange!- …!
| :? Reward ! ! as reward! ! - …!
| :? Trapping! ! as trapping! - …!
…!
| _ - raise | NotSupportedFact fact
let process (fact : IFact) =!
match fact with!
| :? StateChange ! as stateChange!- …!
| :? Reward ! ! as reward! ! - …!
| :? Trapping! ! as trapping! - …!
…!
| _ - raise | NotSupportedFact fact
simple
flexible
saver
location bait
attraction rate
catch rate
auto-tuning
trapping stats
Monster
strength
speed
intelligence
Trap
strength
speed
technology
Monster
strength
speed
intelligence
Trap
strength
speed
technology
Catch Rate %
trial-and-error
“…if you require constant diligence you’re
setting everyone up for failure and hurt”
genetic algorithms
F#-powered DSLs.!
Awesome!
wanna find
correlations?
wanna find
correlations?
you can DIY it! !
;-)
why was
payment service
slow last night?
Pain Driven Development
Amazon!
! .CloudWatch!
! .Selector
github.com/fsprojects/Amazon.CloudWatch.Selector
Find metrics whose 5
min average exceeded
1 second during last
12 hours
cloudWatch.Select(
unitIs “milliseconds” +
average () 1000.0
@ last 12 hours
| intervalOf 5 minutes)
cloudWatch.Select(“
unitIs ‘milliseconds’ and
average  1000.0
duringLast 12 hours
at intervalOf 5 minutes”)
did any cache
nodes’ CPU spike
yesterday?
cloudWatch.Select(
namespaceLike “elasticache” +
nameLike “cpu” +
max () 80.0
@ last 24 hours
| intervalOf 15 minutes)
cloudWatch.Select(
namespaceLike “elasticache” +
nameLike “cpu” +
max () 80.0
@ last 24 hours
| intervalOf 15 minutes)
regex support
Amazing
F#
=
Recap
managed!
key-value store
redundancy!
9-9s guarantee
great performance
name your
throughput
DynamoDB.SQL
github.com/fsprojects/DynamoDb.SQL
GOAL
Disguise
complexity
GOAL
SELECT UserId, TopScore
FROM GameScore
WHERE GameTitle CONTAINS “Zelda”
ORDER DESC!
LIMIT !! 3
WITH (NoConsistentRead)
Query
AST
Execution
F#  FParsec*
*www.quanttec.com/fparsec
External DSL
via
SELECT * FROM GameScore
Abstract Syntax Tree (AST)
FParsec
select GameTitle, UserId, TopScore
from GameScores
where GameTitle = “Starship X”
and TopScore = 1000
order desc
limit 3
with (NoConsistentRead, Index(GameTitleIndex, true))
S3 Provider
github.com/fsprojects/S3Provider
F# type provider for Amazon S3
compile time validation
no code generation
Domain Modelling!
Infrastructure!
Game Logic!
Algorithms!
DSLs
Domain Modelling!
Infrastructure!
Game Logic!
Algorithms!
DSLs
why F#?
time to market
correctness
efficient

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