/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Downloads, parses, and imports the iTunes top songs RSS feed into Core Data.

 */

@import UIKit;

@class iTunesRSSImporter, Song, CategoryCache;

// Protocol for the importer to communicate with its delegate.

@protocol iTunesRSSImporterDelegate <NSObject>

@optional

// Notification posted by NSManagedObjectContext when saved.

- (void)importerDidSave:(NSNotification *)saveNotification;

// Called by the importer when parsing is finished.

- (void)importerDidFinishParsingData:(iTunesRSSImporter *)importer;

// Called by the importer in the case of an error.

- (void)importer:(iTunesRSSImporter *)importer didFailWithError:(NSError *)error;

@end

// Although NSURLConnection is inherently asynchronous, the parsing can be quite CPU intensive on the device, so

// the user interface can be kept responsive by moving that work off the main thread. This does create additional

// complexity, as any code which interacts with the UI must then do so in a thread-safe manner.

//

@interface iTunesRSSImporter : NSOperation

@property (nonatomic, strong, readonly) CategoryCache *theCache;

@property (nonatomic, strong) NSURL *iTunesURL;

@property (nonatomic, assign) id <iTunesRSSImporterDelegate> delegate;

@property (nonatomic, strong) NSPersistentStoreCoordinator *persistentStoreCoordinator;

@end