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fix threading related crashes on OS 3.2/4.0 by switching Core Data thread safety pattern from context locking to using multiple contexts

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This commit is contained in:
Jeff Arena
2010-06-17 16:31:30 -04:00
parent f867c8d0ec
commit 142b89108c
15 changed files with 243 additions and 123 deletions
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42
Code/RKManagedObjectStore.m
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@@ -10,6 +10,7 @@
#import <UIKit/UIKit.h>
NSString* const RKManagedObjectStoreDidFailSaveNotification = @"RKManagedObjectStoreDidFailSaveNotification";
static NSString* const kRKManagedObjectContextKey = @"RKManagedObjectContext";
@interface RKManagedObjectStore (Private)
- (void)createPersistentStoreCoordinator;
@@ -29,7 +30,8 @@ NSString* const RKManagedObjectStoreDidFailSaveNotification = @"RKManagedObjectS
_managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
[self createPersistentStoreCoordinator];
_managedObjectContext = [[NSManagedObjectContext alloc] init];
_managedObjectContext.persistentStoreCoordinator = _persistentStoreCoordinator;
[_managedObjectContext setPersistentStoreCoordinator:_persistentStoreCoordinator];
[_managedObjectContext setUndoManager:nil];
}
return self;
@@ -104,7 +106,43 @@ NSString* const RKManagedObjectStoreDidFailSaveNotification = @"RKManagedObjectS
[_managedObjectContext release];
[self createPersistentStoreCoordinator];
_managedObjectContext = [[NSManagedObjectContext alloc] init];
_managedObjectContext.persistentStoreCoordinator = _persistentStoreCoordinator;
[_managedObjectContext setPersistentStoreCoordinator:_persistentStoreCoordinator];
}
/**
*
* Override managedObjectContext getter to ensure we return a separate context
* for each NSThread.
*
*/
-(NSManagedObjectContext*)managedObjectContext {
if ([NSThread isMainThread]) {
return _managedObjectContext;
} else {
NSMutableDictionary* threadDictionary = [[NSThread currentThread] threadDictionary];
NSManagedObjectContext* backgroundThreadContext = [threadDictionary objectForKey:kRKManagedObjectContextKey];
if (!backgroundThreadContext) {
backgroundThreadContext = [[NSManagedObjectContext alloc] init];
[backgroundThreadContext setPersistentStoreCoordinator:self.persistentStoreCoordinator];
[backgroundThreadContext setUndoManager:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mergeChanges:)
name:NSManagedObjectContextDidSaveNotification
object:backgroundThreadContext];
[threadDictionary setObject:backgroundThreadContext forKey:kRKManagedObjectContextKey];
[backgroundThreadContext release];
}
return backgroundThreadContext;
}
}
- (void)mergeChanges:(NSNotification *)notification {
// Merge changes into the main context on the main thread
[_managedObjectContext performSelectorOnMainThread:@selector(mergeChangesFromContextDidSaveNotification:)
withObject:notification
waitUntilDone:YES];
}
#pragma mark -