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/*
DCTCoreDataStack.m
DCTCoreDataStack
Created by Daniel Tull on 01.12.2011.
Copyright (c) 2011 Daniel Tull. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its contributors may be used
to endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "DCTCoreDataStack.h"
#import "NSManagedObjectContext+DCTCoreDataStack.h"
#import <objc/runtime.h>
@interface DCTCoreDataStack_ManagedObjectContext : NSManagedObjectContext
@end
typedef void (^DCTInternalCoreDataStackSaveBlock) (NSManagedObjectContext *managedObjectContext,
DCTManagedObjectContextSaveCompletionBlock completionHandler);
@interface DCTCoreDataStack ()
+ (NSURL *)dctInternal_applicationDocumentsDirectory;
- (void)dctInternal_loadManagedObjectContext;
- (void)dctInternal_loadManagedObjectModel;
- (void)dctInternal_loadPersistentStoreCoordinator;
@property (nonatomic, readonly) NSPersistentStoreCoordinator *dctInternal_persistentStoreCoordinator;
@end
@implementation DCTCoreDataStack {
__strong NSManagedObjectContext *managedObjectContext;
__strong NSManagedObjectModel *managedObjectModel;
__strong NSPersistentStoreCoordinator *persistentStoreCoordinator;
__strong NSString *modelName;
__strong NSManagedObjectContext *backgroundSavingContext;
}
@synthesize storeType;
@synthesize storeOptions;
@synthesize modelConfiguration;
@synthesize storeURL;
@synthesize modelName;
static NSMutableArray *initBlocks = nil;
static NSMutableArray *deallocBlocks = nil;
+ (void)addInitBlock:(void(^)(DCTCoreDataStack *))block {
static dispatch_once_t sharedToken;
dispatch_once(&sharedToken, ^{
initBlocks = [[NSMutableArray alloc] initWithCapacity:1];
});
[initBlocks addObject:[block copy]];
}
+ (void)addDeallocBlock:(void(^)(DCTCoreDataStack *))block {
static dispatch_once_t sharedToken;
dispatch_once(&sharedToken, ^{
deallocBlocks = [[NSMutableArray alloc] initWithCapacity:1];
});
[deallocBlocks addObject:[block copy]];
}
#pragma mark - NSObject
- (void)dealloc {
for (void(^block)(DCTCoreDataStack *) in deallocBlocks)
block(self);
}
#pragma mark - Initialization
- (id)init {
if (!(self = [super init])) return nil;
for (void(^block)(DCTCoreDataStack *) in initBlocks)
block(self);
return self;
}
- (id)initWithStoreURL:(NSURL *)URL
storeType:(NSString *)type
storeOptions:(NSDictionary *)options
modelConfiguration:(NSString *)configuration
modelName:(NSString *)name {
NSParameterAssert(URL);
NSParameterAssert(type);
if (!(self = [self init])) return nil;
storeURL = [URL copy];
storeType = [type copy];
storeOptions = [options copy];
modelName = [name copy];
modelConfiguration = [configuration copy];
return self;
}
- (id)initWithStoreFilename:(NSString *)filename
storeType:(NSString *)type
storeOptions:(NSDictionary *)options
modelConfiguration:(NSString *)configuration
modelName:(NSString *)name {
NSURL *URL = [[[self class] dctInternal_applicationDocumentsDirectory] URLByAppendingPathComponent:filename];
return [self initWithStoreURL:URL storeType:type storeOptions:options modelConfiguration:configuration modelName:name];
}
- (id)initWithStoreFilename:(NSString *)filename {
return [self initWithStoreFilename:filename storeType:NSSQLiteStoreType storeOptions:nil modelConfiguration:nil modelName:nil];
}
#pragma mark - Getters
- (NSManagedObjectContext *)managedObjectContext {
if (managedObjectContext == nil)
[self dctInternal_loadManagedObjectContext];
return managedObjectContext;
}
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel == nil)
[self dctInternal_loadManagedObjectModel];
return managedObjectModel;
}
#pragma mark - Internal Loading
- (NSPersistentStoreCoordinator *)dctInternal_persistentStoreCoordinator {
if (persistentStoreCoordinator == nil)
[self dctInternal_loadPersistentStoreCoordinator];
return persistentStoreCoordinator;
}
- (void)dctInternal_loadManagedObjectContext {
NSPersistentStoreCoordinator *psc = self.dctInternal_persistentStoreCoordinator;
if (psc == nil) return; // when would this ever happen?
if ([NSManagedObjectContext instancesRespondToSelector:@selector(initWithConcurrencyType:)]) {
backgroundSavingContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
[backgroundSavingContext setPersistentStoreCoordinator:psc];
backgroundSavingContext.dct_name = @"DCTCoreDataStack.backgroundSavingContext";
managedObjectContext = [[DCTCoreDataStack_ManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
[managedObjectContext setParentContext:backgroundSavingContext];
managedObjectContext.dct_name = @"DCTCoreDataStack.managedObjectContext";
} else {
managedObjectContext = [[NSManagedObjectContext alloc] init];
[managedObjectContext setPersistentStoreCoordinator:psc];
managedObjectContext.dct_name = @"DCTCoreDataStack.managedObjectContext";
}
}
- (void)dctInternal_loadManagedObjectModel {
if (modelName) {
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:modelName withExtension:@"momd"];
managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
} else {
managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:[NSBundle mainBundle]]];
}
}
- (void)dctInternal_loadPersistentStoreCoordinator {
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];
NSError *error = nil;
if (![persistentStoreCoordinator addPersistentStoreWithType:self.storeType
configuration:self.modelConfiguration
URL:self.storeURL
options:self.storeOptions
error:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
}
#pragma mark - Other Internal
+ (NSURL *)dctInternal_applicationDocumentsDirectory {
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}
@end
@implementation DCTCoreDataStack_ManagedObjectContext
- (BOOL)save:(NSError **)error {
id object = objc_getAssociatedObject(self, @selector(dct_saveWithCompletionHandler:));
if (object) return [super save:error];
__block BOOL success = [super save:error];
if (success) {
NSManagedObjectContext *parent = self.parentContext;
[parent performBlockAndWait:^{
success = [parent save:error];
}];
}
return success;
}
- (void)dct_saveWithCompletionHandler:(DCTManagedObjectContextSaveCompletionBlock)clientCompletion {
dispatch_queue_t queue = dispatch_get_current_queue();
NSManagedObjectContext *parent = self.parentContext;
#ifdef TARGET_OS_IPHONE
UIBackgroundTaskIdentifier backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];
#endif
DCTManagedObjectContextSaveCompletionBlock completion = ^(BOOL success, NSError *error) {
dispatch_async(queue, ^{
if (clientCompletion != NULL)
clientCompletion(success, error);
#ifdef TARGET_OS_IPHONE
[[UIApplication sharedApplication] endBackgroundTask:backgroundTaskIdentifier];
#endif
});
};
// Put anything in this association to switch on save:
objc_setAssociatedObject(self, _cmd, [NSNull null], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
[super dct_saveWithCompletionHandler:^(BOOL success, NSError *error) {
// Clear the association after the save
objc_setAssociatedObject(self, _cmd, nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
if (!success) {
completion(success, error);
return;
}
[parent performBlock:^{
[parent dct_saveWithCompletionHandler:completion];
}];
}];
}
@end