// AFURLSessionManager.h
// Copyright (c) 2011–2015 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/Foundation.h>
#import "AFURLResponseSerialization.h"
#import "AFURLRequestSerialization.h"
#import "AFSecurityPolicy.h"
#if !TARGET_OS_WATCH
#import "AFNetworkReachabilityManager.h"
#endif
#ifndef NS_DESIGNATED_INITIALIZER
#if __has_attribute(objc_designated_initializer)
#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
#else
#define NS_DESIGNATED_INITIALIZER
#endif
#endif
/**
`AFURLSessionManager` creates and manages an `NSURLSession` object based on a specified `NSURLSessionConfiguration` object, which conforms to `<NSURLSessionTaskDelegate>`, `<NSURLSessionDataDelegate>`, `<NSURLSessionDownloadDelegate>`, and `<NSURLSessionDelegate>`.
## Subclassing Notes
This is the base class for `AFHTTPSessionManager`, which adds functionality specific to making HTTP requests. If you are looking to extend `AFURLSessionManager` specifically for HTTP, consider subclassing `AFHTTPSessionManager` instead.
## NSURLSession & NSURLSessionTask Delegate Methods
`AFURLSessionManager` implements the following delegate methods:
### `NSURLSessionDelegate`
- `URLSession:didBecomeInvalidWithError:`
- `URLSession:didReceiveChallenge:completionHandler:`
- `URLSessionDidFinishEventsForBackgroundURLSession:`
### `NSURLSessionTaskDelegate`
- `URLSession:willPerformHTTPRedirection:newRequest:completionHandler:`
- `URLSession:task:didReceiveChallenge:completionHandler:`
- `URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:`
- `URLSession:task:didCompleteWithError:`
### `NSURLSessionDataDelegate`
- `URLSession:dataTask:didReceiveResponse:completionHandler:`
- `URLSession:dataTask:didBecomeDownloadTask:`
- `URLSession:dataTask:didReceiveData:`
- `URLSession:dataTask:willCacheResponse:completionHandler:`
### `NSURLSessionDownloadDelegate`
- `URLSession:downloadTask:didFinishDownloadingToURL:`
- `URLSession:downloadTask:didWriteData:totalBytesWritten:totalBytesWritten:totalBytesExpectedToWrite:`
- `URLSession:downloadTask:didResumeAtOffset:expectedTotalBytes:`
If any of these methods are overridden in a subclass, they _must_ call the `super` implementation first.
## Network Reachability Monitoring
Network reachability status and change monitoring is available through the `reachabilityManager` property. Applications may choose to monitor network reachability conditions in order to prevent or suspend any outbound requests. See `AFNetworkReachabilityManager` for more details.
## NSCoding Caveats
- Encoded managers do not include any block properties. Be sure to set delegate callback blocks when using `-initWithCoder:` or `NSKeyedUnarchiver`.
## NSCopying Caveats
- `-copy` and `-copyWithZone:` return a new manager with a new `NSURLSession` created from the configuration of the original.
- Operation copies do not include any delegate callback blocks, as they often strongly captures a reference to `self`, which would otherwise have the unintuitive side-effect of pointing to the _original_ session manager when copied.
@warning Managers for background sessions must be owned for the duration of their use. This can be accomplished by creating an application-wide or shared singleton instance.
*/
NS_ASSUME_NONNULL_BEGIN
#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090) || TARGET_OS_WATCH
@interface AFURLSessionManager : NSObject <NSURLSessionDelegate, NSURLSessionTaskDelegate, NSURLSessionDataDelegate, NSURLSessionDownloadDelegate, NSSecureCoding, NSCopying>
/**
The managed session.
*/
@property (readonly, nonatomic, strong) NSURLSession *session;
/**
The operation queue on which delegate callbacks are run.
*/
@property (readonly, nonatomic, strong) NSOperationQueue *operationQueue;
/**
Responses sent from the server in data tasks created with `dataTaskWithRequest:success:failure:` and run using the `GET` / `POST` / et al. convenience methods are automatically validated and serialized by the response serializer. By default, this property is set to an instance of `AFJSONResponseSerializer`.
@warning `responseSerializer` must not be `nil`.
*/
@property (nonatomic, strong) id <AFURLResponseSerialization> responseSerializer;
///-------------------------------
/// @name Managing Security Policy
///-------------------------------
/**
The security policy used by created request operations to evaluate server trust for secure connections. `AFURLSessionManager` uses the `defaultPolicy` unless otherwise specified.
*/
@property (nonatomic, strong) AFSecurityPolicy *securityPolicy;
#if !TARGET_OS_WATCH
///--------------------------------------
/// @name Monitoring Network Reachability
///--------------------------------------
/**
The network reachability manager. `AFURLSessionManager` uses the `sharedManager` by default.
*/
@property (readwrite, nonatomic, strong) AFNetworkReachabilityManager *reachabilityManager;
#endif
///----------------------------
/// @name Getting Session Tasks
///----------------------------
/**
The data, upload, and download tasks currently run by the managed session.
*/
@property (readonly, nonatomic, strong) NSArray *tasks;
/**
The data tasks currently run by the managed session.
*/
@property (readonly, nonatomic, strong) NSArray *dataTasks;
/**
The upload tasks currently run by the managed session.
*/
@property (readonly, nonatomic, strong) NSArray *uploadTasks;
/**
The download tasks currently run by the managed session.
*/
@property (readonly, nonatomic, strong) NSArray *downloadTasks;
///-------------------------------
/// @name Managing Callback Queues
///-------------------------------
/**
The dispatch queue for `completionBlock`. If `NULL` (default), the main queue is used.
*/
#if OS_OBJECT_HAVE_OBJC_SUPPORT
@property (nonatomic, strong, nullable) dispatch_queue_t completionQueue;
#else
@property (nonatomic, assign, nullable) dispatch_queue_t completionQueue;
#endif
/**
The dispatch group for `completionBlock`. If `NULL` (default), a private dispatch group is used.
*/
#if OS_OBJECT_HAVE_OBJC_SUPPORT
@property (nonatomic, strong, nullable) dispatch_group_t completionGroup;
#else
@property (nonatomic, assign, nullable) dispatch_group_t completionGroup;
#endif
///---------------------------------
/// @name Working Around System Bugs
///---------------------------------
/**
Whether to attempt to retry creation of upload tasks for background sessions when initial call returns `nil`. `NO` by default.
@bug As of iOS 7.0, there is a bug where upload tasks created for background tasks are sometimes `nil`. As a workaround, if this property is `YES`, AFNetworking will follow Apple's recommendation to try creating the task again.
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