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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 var executionBlock: ((AsyncBlockOperation) -> Void)?
private var cancellationBlocks: [() -> Void] = []
override init(dispatchQueue: DispatchQueue? = nil) {
super.init(dispatchQueue: dispatchQueue)
}
init(dispatchQueue: DispatchQueue? = nil, block: @escaping (AsyncBlockOperation) -> Void) {
executionBlock = block
super.init(dispatchQueue: dispatchQueue)
}
init(dispatchQueue: DispatchQueue? = nil, block: @escaping () -> Void) {
executionBlock = { operation in
block()
operation.finish()
}
super.init(dispatchQueue: dispatchQueue)
}
override func main() {
let block = executionBlock
executionBlock = nil
if let block = block {
block(self)
} else {
finish()
}
}
override func operationDidCancel() {
let blocks = cancellationBlocks
cancellationBlocks.removeAll()
for block in blocks {
block()
}
}
override func operationDidFinish() {
cancellationBlocks.removeAll()
executionBlock = nil
}
func setExecutionBlock(_ block: @escaping (AsyncBlockOperation) -> Void) {
dispatchQueue.async {
assert(!self.isExecuting && !self.isFinished)
self.executionBlock = block
}
}
func setExecutionBlock(_ block: @escaping () -> Void) {
setExecutionBlock { operation in
block()
operation.finish()
}
}
func addCancellationBlock(_ block: @escaping () -> Void) {
dispatchQueue.async {
if self.isCancelled {
block()
} else {
self.cancellationBlocks.append(block)
}
}
}
}
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