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weibo/Pods/Alamofire/Source/RequestTaskMap.swift

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4 years ago
//
// RequestTaskMap.swift
//
// Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
//
// 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
/// A type that maintains a two way, one to one map of `URLSessionTask`s to `Request`s.
struct RequestTaskMap {
private typealias Events = (completed: Bool, metricsGathered: Bool)
private var tasksToRequests: [URLSessionTask: Request]
private var requestsToTasks: [Request: URLSessionTask]
private var taskEvents: [URLSessionTask: Events]
var requests: [Request] {
Array(tasksToRequests.values)
}
init(tasksToRequests: [URLSessionTask: Request] = [:],
requestsToTasks: [Request: URLSessionTask] = [:],
taskEvents: [URLSessionTask: (completed: Bool, metricsGathered: Bool)] = [:]) {
self.tasksToRequests = tasksToRequests
self.requestsToTasks = requestsToTasks
self.taskEvents = taskEvents
}
subscript(_ request: Request) -> URLSessionTask? {
get { requestsToTasks[request] }
set {
guard let newValue = newValue else {
guard let task = requestsToTasks[request] else {
fatalError("RequestTaskMap consistency error: no task corresponding to request found.")
}
requestsToTasks.removeValue(forKey: request)
tasksToRequests.removeValue(forKey: task)
taskEvents.removeValue(forKey: task)
return
}
requestsToTasks[request] = newValue
tasksToRequests[newValue] = request
taskEvents[newValue] = (completed: false, metricsGathered: false)
}
}
subscript(_ task: URLSessionTask) -> Request? {
get { tasksToRequests[task] }
set {
guard let newValue = newValue else {
guard let request = tasksToRequests[task] else {
fatalError("RequestTaskMap consistency error: no request corresponding to task found.")
}
tasksToRequests.removeValue(forKey: task)
requestsToTasks.removeValue(forKey: request)
taskEvents.removeValue(forKey: task)
return
}
tasksToRequests[task] = newValue
requestsToTasks[newValue] = task
taskEvents[task] = (completed: false, metricsGathered: false)
}
}
var count: Int {
precondition(tasksToRequests.count == requestsToTasks.count,
"RequestTaskMap.count invalid, requests.count: \(tasksToRequests.count) != tasks.count: \(requestsToTasks.count)")
return tasksToRequests.count
}
var eventCount: Int {
precondition(taskEvents.count == count, "RequestTaskMap.eventCount invalid, count: \(count) != taskEvents.count: \(taskEvents.count)")
return taskEvents.count
}
var isEmpty: Bool {
precondition(tasksToRequests.isEmpty == requestsToTasks.isEmpty,
"RequestTaskMap.isEmpty invalid, requests.isEmpty: \(tasksToRequests.isEmpty) != tasks.isEmpty: \(requestsToTasks.isEmpty)")
return tasksToRequests.isEmpty
}
var isEventsEmpty: Bool {
precondition(taskEvents.isEmpty == isEmpty, "RequestTaskMap.isEventsEmpty invalid, isEmpty: \(isEmpty) != taskEvents.isEmpty: \(taskEvents.isEmpty)")
return taskEvents.isEmpty
}
mutating func disassociateIfNecessaryAfterGatheringMetricsForTask(_ task: URLSessionTask) -> Bool {
guard let events = taskEvents[task] else {
fatalError("RequestTaskMap consistency error: no events corresponding to task found.")
}
switch (events.completed, events.metricsGathered) {
case (_, true): fatalError("RequestTaskMap consistency error: duplicate metricsGatheredForTask call.")
case (false, false): taskEvents[task] = (completed: false, metricsGathered: true); return false
case (true, false): self[task] = nil; return true
}
}
mutating func disassociateIfNecessaryAfterCompletingTask(_ task: URLSessionTask) -> Bool {
guard let events = taskEvents[task] else {
fatalError("RequestTaskMap consistency error: no events corresponding to task found.")
}
switch (events.completed, events.metricsGathered) {
case (true, _): fatalError("RequestTaskMap consistency error: duplicate completionReceivedForTask call.")
#if os(watchOS) // watchOS doesn't gather metrics, so unconditionally remove the reference and return true.
default: self[task] = nil; return true
#else
case (false, false): taskEvents[task] = (completed: true, metricsGathered: false); return false
case (false, true): self[task] = nil; return true
#endif
}
}
}