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TypedNotificationCenter.swift
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TypedNotificationCenter.swift
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//
// TypedNotificationCenter.swift
// TypedNotificationCenter
//
// Created by Benedek Kozma on 2019. 05. 05.
// Copyright (c) 2019. Benedek Kozma
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
import Foundation
typealias NotificationIdentifier = ObjectIdentifier
typealias SenderIdentifier = ObjectIdentifier
public final class TypedNotificationCenter {
let observerLock = NSLock()
var observers = [NotificationIdentifier: [SenderIdentifier: [ObjectIdentifier: WeakBox<AnyObject>]]]()
let nsNotificationCenterForBridging: NotificationCenter
var bridgedObservers = [Notification.Name: [SenderIdentifier: [ObjectIdentifier: WeakBox<_GenericBridgedNotificationObservation>]]]()
var bridgedNsnotificationObservers = [Notification.Name: TypedNotificationObservation]()
var genericNsnotificationObservers = [Notification.Name: _GenericNsNotificationObservation]()
// MARK: - Utility functions
private func filter<T: TypedNotification>(_: T.Type, sender: AnyObject)
-> (nilObservations: Dictionary<ObjectIdentifier, WeakBox<AnyObject>>.Values?, objectObservations: Dictionary<ObjectIdentifier, WeakBox<AnyObject>>.Values?)
{
let notificationIdentifier = NotificationIdentifier(T.self)
let senderIdentifier = SenderIdentifier(sender)
let observationsForNotification = observers[notificationIdentifier]
let nilObservations = observationsForNotification?[nilSenderIdentifier]?.values
let objectObservations = observationsForNotification?[senderIdentifier]?.values
return (nilObservations, objectObservations)
}
// MARK: - Internal functions
func remove<T>(observation: _TypedNotificationObservation<T>) {
let notificationIdentifier = NotificationIdentifier(T.self)
let senderIdentifier = observation.senderIdentifier
let observerIdentifier = ObjectIdentifier(observation)
observerLock.lock()
observers[notificationIdentifier]?[senderIdentifier]?.removeValue(forKey: observerIdentifier)
if observers[notificationIdentifier]?[senderIdentifier]?.isEmpty == true {
observers[notificationIdentifier]?.removeValue(forKey: senderIdentifier)
}
observerLock.unlock()
}
func _observe<T: TypedNotification>(_: T.Type, object: T.Sender?, queue: OperationQueue? = nil, block: @escaping T.ObservationBlock) -> TypedNotificationObservation {
let object = T.Sender.self is NSNull.Type ? nil : object
let observation = _TypedNotificationObservation<T>(notificationCenter: self, sender: object, queue: queue, block: block)
let notificationIdentifier = NotificationIdentifier(T.self)
let senderIdentifier = observation.senderIdentifier
let observerIdentifier = ObjectIdentifier(observation)
let boxedObservation = WeakBox<AnyObject>(observation)
observerLock.lock()
observers[notificationIdentifier, default: [:]][senderIdentifier, default: [:]][observerIdentifier] = boxedObservation
observerLock.unlock()
return observation
}
func _post<T: TypedNotification>(_: T.Type, sender: T.Sender, payload: T.Payload) {
var nilObservations: Dictionary<ObjectIdentifier, WeakBox<AnyObject>>.Values?
var objectObservations: Dictionary<ObjectIdentifier, WeakBox<AnyObject>>.Values?
observerLock.lock()
(nilObservations, objectObservations) = filter(T.self, sender: sender)
observerLock.unlock()
nilObservations?.forEach { observation in
guard let observation = observation.object as? _TypedNotificationObservation<T> else { return }
if let queue = observation.queue,
let block = observation.block
{
queue.addOperation {
block(sender, payload)
}
} else {
observation.block?(sender, payload)
}
}
objectObservations?.forEach { observation in
guard let observation = observation.object as? _TypedNotificationObservation<T>,
observation.sender != nil
else { return }
if let queue = observation.queue,
let block = observation.block
{
queue.addOperation {
block(sender, payload)
}
} else {
observation.block?(sender, payload)
}
}
}
// MARK: - Public interface
public init(nsNotificationCenterForBridging: NotificationCenter = .default) {
self.nsNotificationCenterForBridging = nsNotificationCenterForBridging
}
public static let `default` = TypedNotificationCenter()
public func observe<T: TypedNotification>(_: T.Type, object: T.Sender?, queue: OperationQueue? = nil, block: @escaping T.ObservationBlock) -> TypedNotificationObservation {
if T.Payload.self is DictionaryRepresentable.Type {
let proxy = T.eraseNotificationName()
return observe(proxy, object: object, queue: queue, block: block)
} else {
return _observe(T.self, object: object, queue: queue, block: block)
}
}
public func post<T: TypedNotification>(_: T.Type, sender: T.Sender, payload: T.Payload) {
if T.Payload.self is DictionaryRepresentable.Type {
let proxy = T.eraseNotificationName()
post(proxy, sender: sender, payload: payload)
} else {
_post(T.self, sender: sender, payload: payload)
}
}
}