Created
July 11, 2020 03:57
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import Cocoa | |
import Combine | |
import ObjectiveC | |
import PlaygroundSupport | |
PlaygroundPage.current.needsIndefiniteExecution = true | |
enum Action { | |
static func run(after delay: Double, action: @escaping () -> Void) { | |
let delayTime = UInt64(delay * Double(NSEC_PER_SEC)) | |
let dispatchTime = DispatchTime(uptimeNanoseconds: DispatchTime.now().rawValue + delayTime) | |
DispatchQueue.global(qos: .background) | |
.asyncAfter(deadline: dispatchTime, execute: action) | |
} | |
} | |
class AsyncRandomNumberSource { | |
var number: Int | |
var subject: PassthroughSubject<Int, Never> | |
func action() { | |
Action.run(after: Double.random(in: 0.1 ... 3.0)) { [weak self] in | |
if let self = self { | |
// send a number or end | |
switch Int.random(in: 1 ... 20) { | |
case 20: | |
self.subject.send(completion: .finished) | |
default: | |
self.number = Int.random(in: 1 ..< 1000) | |
self.subject.send(self.number) | |
self.roll() | |
} | |
} | |
} | |
} | |
func roll() { | |
action() | |
} | |
init(_ subject: PassthroughSubject<Int, Never>) { | |
self.subject = subject | |
number = 0 | |
action() | |
} | |
} | |
let passthroughSubject = PassthroughSubject<Int,Never>() | |
let cancellableSubscriber = passthroughSubject.sink { completionInfo in | |
switch completionInfo { | |
case .finished: print("Done!!") | |
case .failure(let error): print("Error: \(error)") | |
} | |
} receiveValue: { stringElement in | |
print(stringElement, "received") | |
} | |
let source = AsyncRandomNumberSource(passthroughSubject) |
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