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//
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//  Notifications.swift
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//
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//  Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
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//
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//  Permission is hereby granted, free of charge, to any person obtaining a copy
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//  of this software and associated documentation files (the "Software"), to deal
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//  in the Software without restriction, including without limitation the rights
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//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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//  copies of the Software, and to permit persons to whom the Software is
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//  furnished to do so, subject to the following conditions:
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//
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//  The above copyright notice and this permission notice shall be included in
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//  all copies or substantial portions of the Software.
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//
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//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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//  THE SOFTWARE.
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//
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import Foundation
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extension Request {
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    /// Posted when a `Request` is resumed. The `Notification` contains the resumed `Request`.
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    public static let didResumeNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didResume")
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    /// Posted when a `Request` is suspended. The `Notification` contains the suspended `Request`.
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    public static let didSuspendNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didSuspend")
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    /// Posted when a `Request` is cancelled. The `Notification` contains the cancelled `Request`.
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    public static let didCancelNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didCancel")
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    /// Posted when a `Request` is finished. The `Notification` contains the completed `Request`.
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    public static let didFinishNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didFinish")
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    /// Posted when a `URLSessionTask` is resumed. The `Notification` contains the `Request` associated with the `URLSessionTask`.
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    public static let didResumeTaskNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didResumeTask")
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    /// Posted when a `URLSessionTask` is suspended. The `Notification` contains the `Request` associated with the `URLSessionTask`.
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    public static let didSuspendTaskNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didSuspendTask")
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    /// Posted when a `URLSessionTask` is cancelled. The `Notification` contains the `Request` associated with the `URLSessionTask`.
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    public static let didCancelTaskNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didCancelTask")
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    /// Posted when a `URLSessionTask` is completed. The `Notification` contains the `Request` associated with the `URLSessionTask`.
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    public static let didCompleteTaskNotification = Notification.Name(rawValue: "org.alamofire.notification.name.request.didCompleteTask")
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}
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// MARK: -
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extension Notification {
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    /// The `Request` contained by the instance's `userInfo`, `nil` otherwise.
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    public var request: Request? {
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        userInfo?[String.requestKey] as? Request
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    }
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    /// Convenience initializer for a `Notification` containing a `Request` payload.
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    ///
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    /// - Parameters:
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    ///   - name:    The name of the notification.
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    ///   - request: The `Request` payload.
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    init(name: Notification.Name, request: Request) {
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        self.init(name: name, object: nil, userInfo: [String.requestKey: request])
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    }
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}
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extension NotificationCenter {
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    /// Convenience function for posting notifications with `Request` payloads.
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    ///
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    /// - Parameters:
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    ///   - name:    The name of the notification.
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    ///   - request: The `Request` payload.
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    func postNotification(named name: Notification.Name, with request: Request) {
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        let notification = Notification(name: name, request: request)
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        post(notification)
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    }
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}
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extension String {
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    /// User info dictionary key representing the `Request` associated with the notification.
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    fileprivate static let requestKey = "org.alamofire.notification.key.request"
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}
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/// `EventMonitor` that provides Alamofire's notifications.
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public final class AlamofireNotifications: EventMonitor {
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    public func requestDidResume(_ request: Request) {
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        NotificationCenter.default.postNotification(named: Request.didResumeNotification, with: request)
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    }
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    public func requestDidSuspend(_ request: Request) {
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        NotificationCenter.default.postNotification(named: Request.didSuspendNotification, with: request)
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    }
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    public func requestDidCancel(_ request: Request) {
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        NotificationCenter.default.postNotification(named: Request.didCancelNotification, with: request)
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    }
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    public func requestDidFinish(_ request: Request) {
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        NotificationCenter.default.postNotification(named: Request.didFinishNotification, with: request)
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    }
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    public func request(_ request: Request, didResumeTask task: URLSessionTask) {
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        NotificationCenter.default.postNotification(named: Request.didResumeTaskNotification, with: request)
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    }
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    public func request(_ request: Request, didSuspendTask task: URLSessionTask) {
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        NotificationCenter.default.postNotification(named: Request.didSuspendTaskNotification, with: request)
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    }
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    public func request(_ request: Request, didCancelTask task: URLSessionTask) {
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        NotificationCenter.default.postNotification(named: Request.didCancelTaskNotification, with: request)
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    }
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    public func request(_ request: Request, didCompleteTask task: URLSessionTask, with error: AFError?) {
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        NotificationCenter.default.postNotification(named: Request.didCompleteTaskNotification, with: request)
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    }
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}