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//
// OperationObserver.swift
// MullvadVPN
//
// Created by pronebird on 30/05/2022.
// Copyright © 2022 Mullvad VPN AB. All rights reserved.
//
import Foundation
protocol OperationObserver {
func didAttach(to operation: Operation)
func operationDidStart(_ operation: Operation)
func operationDidCancel(_ operation: Operation)
func operationDidFinish(_ operation: Operation)
}
/// Block based operation observer.
class OperationBlockObserver<OperationType: Operation>: OperationObserver {
typealias VoidBlock = (OperationType) -> Void
private let _didAttach: VoidBlock?
private let _didStart: VoidBlock?
private let _didCancel: VoidBlock?
private let _didFinish: VoidBlock?
init(
didAttach: VoidBlock? = nil,
didStart: VoidBlock? = nil,
didCancel: VoidBlock? = nil,
didFinish: VoidBlock? = nil
)
{
_didAttach = didAttach
_didStart = didStart
_didCancel = didCancel
_didFinish = didFinish
}
func didAttach(to operation: Operation) {
if let operation = operation as? OperationType {
_didAttach?(operation)
}
}
func operationDidStart(_ operation: Operation) {
if let operation = operation as? OperationType {
_didStart?(operation)
}
}
func operationDidCancel(_ operation: Operation) {
if let operation = operation as? OperationType {
_didCancel?(operation)
}
}
func operationDidFinish(_ operation: Operation) {
if let operation = operation as? OperationType {
_didFinish?(operation)
}
}
}
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