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//
// ObserverList.swift
// MullvadVPN
//
// Created by pronebird on 26/06/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
import Foundation
protocol WeakObserverBox: Equatable {
associatedtype Wrapped
var inner: Wrapped? { get }
}
class ObserverList<T: WeakObserverBox> {
private let lock = NSRecursiveLock()
private var observers = [T]()
func append(_ observer: T) {
lock.withCriticalBlock {
if !self.observers.contains(observer) {
self.observers.append(observer)
}
}
}
func remove(_ observer: T) {
lock.withCriticalBlock {
self.observers.removeAll { $0 == observer }
}
}
func forEach(_ body: (T) -> Void) {
lock.withCriticalBlock {
var discardObservers = [T]()
self.observers.forEach { (boxedObserver) in
body(boxedObserver)
if boxedObserver.inner == nil {
discardObservers.append(boxedObserver)
}
}
if !discardObservers.isEmpty {
self.observers.removeAll { (observer) -> Bool in
return discardObservers.contains(observer)
}
}
}
}
}
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