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Async Programming & Actor Model
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Pishen Tsai
July 24, 2015
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Async Programming & Actor Model
Pishen Tsai
July 24, 2015
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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~