Publishers.Merge

์ œ๋„ค๋ฆญ ๊ตฌ์กฐ์ฒด | ๋‘ ๊ฐœ์˜ ์ƒ์œ„ Publisher์— ๊ฒฐํ•ฉ ํ•จ์ˆ˜๋ฅผ ์ ์šฉํ•˜์—ฌ ์ƒ์„ฑ๋˜๋Š” Publisher

์ด๋‹ˆ์…œ๋ผ์ด์ €๋Š” ์กฐํ•ฉํ•  ๋‘ ๊ฐœ์˜ Publisher๋ฅผ ๋ฐ›๋Š”๋‹ค.

์ธ์ž์— ๋“ค์–ด๊ฐ€๋Š” ๋ชจ๋“  Publisher์˜ Output ํƒ€์ž…๊ณผ ์—๋Ÿฌ ํƒ€์ž…์€ ๊ฐ™์•„์•ผ ํ•œ๋‹ค.

๋‘ ๊ฐœ์˜ ์ŠคํŠธ๋ฆผ์„ ํ•˜๋‚˜๋กœ ํ•ฉ์ณ ํ•˜๋‚˜์˜ ์ŠคํŠธ๋ฆผ์„ ๋‹ค๋ฃจ๋Š” ๊ฒƒ์ฒ˜๋Ÿผ ํ•˜๊ธฐ ์œ„ํ•ด ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค.

merge ์˜คํผ๋ ˆ์ดํ„ฐ์™€ ๊ด€๋ จ์ด ์žˆ๋‹ค.

let aSubject = PassthroughSubject<Int, Never>()
let bSubject = PassthroughSubject<Int, Never>()

// Publishers.Merge Publisher
Publishers
  .Merge(aSubject, bSubject)
  .sink(receiveCompletion: { completion in
    switch completion {
    case .failure:
      print("Combine Merge Error")
    case .finished:
      print("Combine Merge Finish")
    }
  }, receiveValue: { value in
    print("Combine Merge : \(value)")
  })
  .store(in: &cancellables)

// merge Operator
aSubject
  .merge(with: bSubject)
  .sink(receiveCompletion: { completion in
    switch completion {
    case .failure:
      print("Combine Merge Error")
    case .finished:
      print("Combine Merge Finish")
    }
  }, receiveValue: { value in
    print("Combine Merge : \(value)")
  })
  .store(in: &cancellables)

// 1
aSubject.send(1)
// 2
aSubject.send(2)
// 3
bSubject.send(3)
// 4
bSubject.send(4)

// Combine Merge : 1
// Combine Merge : 2
// Combine Merge : 3
// Combine Merge : 4

์ฝ”๋“œ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์ด ๋™์ž‘ํ•œ๋‹ค.

  1. 1์˜ ์ฝ”๋“œ๋ฅผ ์‹คํ–‰ํ•˜์—ฌ aSubject์— 1์˜ ๊ฐ’์„ ์ „๋‹ฌํ•œ๋‹ค. ํ•ด๋‹น Publisher๋Š” 1์˜ ๊ฐ’์„ ๋‚ธ๋‹ค.

  2. 2์˜ ์ฝ”๋“œ๋ฅผ ์‹คํ–‰ํ•˜์—ฌ aSubject์— 2์˜ ๊ฐ’์„ ์ „๋‹ฌํ•œ๋‹ค. ํ•ด๋‹น Publisher๋Š” 2์˜ ๊ฐ’์„ ๋‚ธ๋‹ค.

  3. 3์˜ ์ฝ”๋“œ๋ฅผ ์‹คํ–‰ํ•˜์—ฌ bSubject์— 3์˜ ๊ฐ’์„ ์ „๋‹ฌํ•œ๋‹ค. ํ•ด๋‹น Publisher๋Š” 3์˜ ๊ฐ’์„ ๋‚ธ๋‹ค.

  4. 4์˜ ์ฝ”๋“œ๋ฅผ ์‹คํ–‰ํ•˜์—ฌ bSubject์— 4์˜ ๊ฐ’์„ ์ „๋‹ฌํ•œ๋‹ค. ํ•ด๋‹น Publisher๋Š” 4์˜ ๊ฐ’์„ ๋‚ธ๋‹ค.

RxSwift

merge ์˜คํผ๋ ˆ์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๊ตฌํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค.

let aSubject = PublishSubject<Int>()
let bSubject = PublishSubject<Int>()

Observable.merge(aSubject, bSubject)
  .subscribe(onNext: { value in
    print("RxSwift Merge : \(value)")
  }, onError: { _ in
    print("RxSwift Merge Error")
  }, onCompleted: {
    print("RxSwift Merge Finish")
  })
  .disposed(by: disposeBag)

aSubject.onNext(1)
aSubject.onNext(2)
bSubject.onNext(3)
bSubject.onNext(4)

// RxSwift Merge : 1
// RxSwift Merge : 2
// RxSwift Merge : 3
// RxSwift Merge : 4

ReactiveSwift

merge ์˜คํผ๋ ˆ์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๊ตฌํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค.

let aProperty = MutableProperty<Int>(0)
let bProperty = MutableProperty<Int>(0)

aProperty.signal
  .merge(with: bProperty.signal)
  .observe { event in
    switch event {
    case let .value(value):
      print("ReactiveSwift Merge : \(value)")
    case .failed:
      print("ReactiveSwift Merge Error")
    case .completed:
      print("ReactiveSwift Merge Finish")
    default:
      break
    }
  }

aProperty.value = 1
aProperty.value = 2
bProperty.value = 3
bProperty.value = 4

// ReactiveSwift Merge : 1
// ReactiveSwift Merge : 2
// ReactiveSwift Merge : 3
// ReactiveSwift Merge : 4
// ReactiveSwift Merge Finish

์ฐธ๊ณ 

ReactiveX - Operators - Merge

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