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CoreData utility class for LocalCacheSample #BLOG
#import "CoreDataController.h"
@interface CoreDataController ()
@property (strong, nonatomic) NSManagedObjectContext *masterManagedObjectContext;
@property (strong, nonatomic) NSManagedObjectContext *backgroundManagedObjectContext;
@property (strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@end
@implementation CoreDataController
+ (id)sharedInstance {
static dispatch_once_t once;
static CoreDataController *sharedInstance;
dispatch_once(&once, ^{
sharedInstance = [[self alloc] init];
});
return sharedInstance;
}
#pragma mark - Core Data stack
// Used to propegate saves to the persistent store (disk) without blocking the UI
- (NSManagedObjectContext *)masterManagedObjectContext {
if (_masterManagedObjectContext != nil) {
return _masterManagedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
_masterManagedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
[_masterManagedObjectContext performBlockAndWait:^{
[_masterManagedObjectContext setPersistentStoreCoordinator:coordinator];
}];
}
return _masterManagedObjectContext;
}
// Return the NSManagedObjectContext to be used in the background during sync
- (NSManagedObjectContext *)backgroundManagedObjectContext {
if (_backgroundManagedObjectContext != nil) {
return _backgroundManagedObjectContext;
}
NSManagedObjectContext *masterContext = [self masterManagedObjectContext];
if (masterContext != nil) {
_backgroundManagedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
[_backgroundManagedObjectContext performBlockAndWait:^{
[_backgroundManagedObjectContext setParentContext:masterContext];
}];
}
return _backgroundManagedObjectContext;
}
// Return the NSManagedObjectContext to be used in the background during sync
- (NSManagedObjectContext *)newManagedObjectContext {
NSManagedObjectContext *newContext = nil;
NSManagedObjectContext *masterContext = [self masterManagedObjectContext];
if (masterContext != nil) {
newContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
[newContext performBlockAndWait:^{
[newContext setParentContext:masterContext];
}];
}
return newContext;
}
- (void)saveMasterContext {
[self.masterManagedObjectContext performBlockAndWait:^{
NSError *error = nil;
BOOL saved = [self.masterManagedObjectContext save:&error];
if (!saved) {
// do some real error handling
DLog(@"Could not save master context due to %@", error);
}
}];
}
- (void)saveBackgroundContext {
[self.backgroundManagedObjectContext performBlockAndWait:^{
NSError *error = nil;
BOOL saved = [self.backgroundManagedObjectContext save:&error];
if (!saved) {
// do some real error handling
DLog(@"Could not save background context due to %@", error);
}
}];
}
// Returns the managed object model for the application.
// If the model doesn't already exist, it is created from the application's model.
- (NSManagedObjectModel *)managedObjectModel
{
if (_managedObjectModel != nil) {
return _managedObjectModel;
}
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:YOUR_APP_NAME withExtension:@"momd"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return _managedObjectModel;
}
// Returns the persistent store coordinator for the application.
// If the coordinator doesn't already exist, it is created and the application's store added to it.
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (_persistentStoreCoordinator != nil) {
return _persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"YOURAPPNAME.sqlite"];
NSError *error = nil;
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
DLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
return _persistentStoreCoordinator;
}
#pragma mark - Application's Documents directory
// Returns the URL to the application's Documents directory.
- (NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}
@end
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