Actor のサンプル

ActorSample.playground

import _Concurrency


// MARK: Class
print("------------------ CLASS ------------------------")
// class だと順番がぐちゃぐちゃになることがある 1 -> 8 まで順番に出力されない（データ競合）
class ClassCounter {
    static var shared = ClassCounter()
    private init() {}

    var value = 0

    func increment() -> Int {
        value += 1
        return value
    }
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

Task.detached {
    print( ClassCounter.shared.increment()) // data race
}

// MARK: Actor
print("------------------ ACTOR ------------------------")
// actor はデータ競合から守る 1 -> 8 まで順番に表示される
actor ActorCounter {
    static var shared = ActorCounter()
    private init() {}

    var value = 0

    func increment() -> Int {
        value += 1
        return value
    }
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}

Task.detached {
    print(await ActorCounter.shared.increment())
}