Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Async Programming & Actor Model
Search
Pishen Tsai
July 24, 2015
0
67
Async Programming & Actor Model
Pishen Tsai
July 24, 2015
Tweet
Share
More Decks by Pishen Tsai
See All by Pishen Tsai
Introduction to Minitime
pishen
1
100
都什麼時代了,你還在寫 while loop 嗎?
pishen
2
680
Pishen's Emacs Journey
pishen
0
99
Scala + Google Dataflow = Serverless Spark
pishen
6
740
Shapeless Introduction
pishen
2
820
ScalaKitchen
pishen
1
320
sbt-emr-spark
pishen
1
95
My Personal Report of Scala Kansai 2016
pishen
0
160
SBT Basic Concepts
pishen
1
490
Featured
See All Featured
Put a Button on it: Removing Barriers to Going Fast.
kastner
58
3k
KATA
mclloyd
14
11k
Code Reviewing Like a Champion
maltzj
512
39k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
39
4.3k
Visualization
eitanlees
135
14k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
18
1.7k
Teambox: Starting and Learning
jrom
126
8.4k
Unsuck your backbone
ammeep
661
56k
Adopting Sorbet at Scale
ufuk
66
8.5k
How to train your dragon (web standard)
notwaldorf
71
5.1k
5 minutes of I Can Smell Your CMS
philhawksworth
199
19k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
657
120k
Transcript
Async Programming & Actor Model @pishen
Asynchronous programming val a: Future[Int] = Future { //time-consuming process
result } a.map(x => x + 1) callback listener
Asynchronous programming val a: Future[Int] = ??? def f(x: Int):
Future[Int] = ??? val r = a.map(x => f(x)) Future[Future[Int]]
Asynchronous programming val a: Future[Int] = ??? def f(x: Int):
Future[Int] = ??? val r = a.flatMap(x => f(x)) Future[Int]
Asynchronous programming val a: Future[Int] = ??? def f(x: Int):
Future[Int] = ??? val r = a.flatMap(x => f(x)) val p = Await.result(r, 3.seconds) Int
T T T T T T T Future { ???
} a.map(???) ??? Await(???)
T T T T T T T Future { ???
} a.map(???) F ??? Await(???)
T T T T T T T Future { ???
} a.map(???) F ??? Await(???)
T T T T T T T Future { ???
} a.map(???) F ??? F Await(???)
T T T T T T T Future { ???
} a.map(???) F ??? F Await(???)
T T T T T T Future { ??? }
a.map(???) F F ??? Await(???) T
T T T T T T Future { ??? }
a.map(???) F F ??? Await(???) T
T T T T T T Future { ??? }
a.map(???) F F ??? Await(???) T
T T T T T T Future { ??? }
a.map(???) F F ??? Await(???) T
T T T T T T Future { ??? }
a.map(???) F F ??? Await(???) T
T T T T T T Future { ??? }
a.map(???) F F ??? Await(???) T C C
T R
T R R R
T R R R C C C C C C
C C
T R C C C C C C C C
T T R R
T R C C C C C C C C
T T R R R R R R R R R R R R R R 1000+
Orz T T R C C C C C C
C T T R R R R R R R R R R R R R R 1000+ T T T T T T T T T switching thread takes time... crashed, nothing get computed after all...
R C C C C C C C T R
R R R R R R R R R R R R R 1000+ T thread pool C T T T T T T
R C C C C C C C T R
R R R R R R R R R R R R R T C T T T T T T access DB long computing
R C C C C C C C T R
R R R R R R R R R R R R R T C T T T T T T access DB long computing blocking
R C C C C C C C T R
R R R R R R R R R R R R R C T T T T T T T T T T T T T T T T T T T T T T T T T T T T T F F F F F F 1000+ async squeeze out the performance of your machine
Life is beautiful ...before you have states.
HP MP position weapon exp hunger Running Attacked Attacking Eating
HP MP position weapon exp hunger Running Attacked Attacking Need
lock(s) to prevent strange things happen. Eating
HP MP position weapon exp hunger Running Attacked Attacking No
matter you forward the job to DB or what. Eating
HP MP position weapon exp hunger Running Attacked Attacking All
the other threads get blocked. Eating
Can we get rid of the locks?
P W Wrap the states in an Actor. T m
h p a e mailbox
P W Wrap the states in an Actor. T m
h p a e mailbox T
P W Wrap the states in an Actor. T m
h p a e mailbox T
T T T T T T T T T T
T T T T T T T front m back
T T T T T T T T T T
T T T T T T T front m l back
T T T T T T T T T T
T T T T T T T front m l back Disk
Life is beautiful ...before you have many machines.
T T T T T T T T T T
T T T T T T T front m l back Machine A T T T T T T s Machine B Disk
Tell & Ask val a: ActorRef = ctx.actorOf(???) a !
“Hello!” (a ? “What’s your name?”) .mapTo[String] .map(name => ???)
Receive messages class MyActor extends Actor { def receive =
{ case “Hello!” => ??? case “What’s your name?” => sender ! “Pishen” } }
Create the Future[T] with Scala~