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//
// CancellableChain.swift
// MullvadTransport
//
// Created by pronebird on 23/10/2023.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
import MullvadTypes
/// Cancellable object that cancels all cancellable objects linked to it.
final class CancellableChain: Cancellable {
private let stateLock = NSLock()
private var isCancelled = false
private var linkedTokens: [Cancellable] = []
init() {}
/// Link cancellation token with some other.
///
/// The token is cancelled immediately, if the chain is already cancelled.
func link(_ token: Cancellable) {
stateLock.withLock {
if isCancelled {
token.cancel()
} else {
linkedTokens.append(token)
}
}
}
/// Request cancellation.
///
/// Cancels and releases any of the connected tokens.
func cancel() {
stateLock.withLock {
isCancelled = true
linkedTokens.forEach { $0.cancel() }
linkedTokens.removeAll()
}
}
}
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