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//
// AsyncBlockOperation.swift
// MullvadVPN
//
// Created by pronebird on 06/07/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
import Foundation
/// Asynchronous block operation
class AsyncBlockOperation: AsyncOperation {
private let stateLock = NSLock()
private var executionBlock: ((AsyncBlockOperation) -> Void)?
private var cancellationBlocks: [() -> Void] = []
init(block: @escaping (AsyncBlockOperation) -> Void) {
executionBlock = block
}
override func main() {
stateLock.lock()
let block = executionBlock
executionBlock = nil
stateLock.unlock()
block?(self)
}
override func finish() {
stateLock.lock()
cancellationBlocks.removeAll()
executionBlock = nil
stateLock.unlock()
super.finish()
}
override func cancel() {
super.cancel()
stateLock.lock()
let blocks = cancellationBlocks
cancellationBlocks.removeAll()
stateLock.unlock()
for block in blocks {
block()
}
}
func addCancellationBlock(_ block: @escaping () -> Void) {
stateLock.lock()
if isCancelled {
stateLock.unlock()
block()
} else {
cancellationBlocks.append(block)
stateLock.unlock()
}
}
}
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