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Boolによる簡易排他制御

Last updated at Posted at 2017-09-16

連続して同じ処理が走らないようにBoolを使った排他制御をすることがあると思います。そういったケースで使えるプチ便利なクラスを書きました。

class BooleanLock {
    
    private var doing = false
    
    func withLock(_ f: (@escaping () -> Void) -> Void) {
        if doing { return }
        
        doing = true
        f(unlock)
    }
    
    private func unlock() {
        doing = false
    }
}

使い方

class BooleanLockTest {

    ...

    private let fetching = BooleanLock()

    ...

    func doFetch() {
        fetching.withLock { unlock in
            // do something
            // ...

            unlock()
        }
    }    
}

以上

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