mirror of
https://github.com/zhigang1992/RestKit.git
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79e31b524a
* Migrated the caches to return `NSSet` to eliminate duplicate objects when your cache keys overlap * Introduced new recursive strategy for building cache keys in `RKInMemoryManagedObjectCache` * Added support for array cache key values in `RKFetchRequestManagedObjectCache` * Re-enabled a slew of tests that were disabled during 0.20 development
88 lines
3.6 KiB
Objective-C
88 lines
3.6 KiB
Objective-C
//
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// RKFetchRequestMappingCache.m
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// RestKit
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//
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// Created by Jeff Arena on 1/24/12.
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// Copyright (c) 2009-2012 RestKit. All rights reserved.
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//
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#import "RKFetchRequestManagedObjectCache.h"
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#import "RKLog.h"
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#import "RKPropertyInspector.h"
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#import "RKPropertyInspector+CoreData.h"
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#import "RKObjectUtilities.h"
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// Set Logging Component
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#undef RKLogComponent
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#define RKLogComponent RKlcl_cRestKitCoreData
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/*
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NOTE: At the moment this cache key assume that the structure of the values for each key in the `attributeValues` in constant
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i.e. if you have `userID`, it will always be a single value, or `userIDs` will always be an array.
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It will need to be reimplemented if changes in attribute values occur during the life of a single cache
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*/
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static NSString *RKPredicateCacheKeyForAttributes(NSArray *attributeNames)
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{
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return [[attributeNames sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] componentsJoinedByString:@":"];
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}
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// NOTE: We build a dynamic format string here because `NSCompoundPredicate` does not support use of substiution variables
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static NSPredicate *RKPredicateWithSubsitutionVariablesForAttributeValues(NSDictionary *attributeValues)
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{
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NSArray *attributeNames = [attributeValues allKeys];
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NSMutableArray *formatFragments = [NSMutableArray arrayWithCapacity:[attributeNames count]];
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[attributeValues enumerateKeysAndObjectsUsingBlock:^(NSString *attributeName, id value, BOOL *stop) {
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NSString *formatFragment = RKObjectIsCollection(value)
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? [NSString stringWithFormat:@"%@ IN $%@", attributeName, attributeName]
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: [NSString stringWithFormat:@"%@ = $%@", attributeName, attributeName];
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[formatFragments addObject:formatFragment];
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}];
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return [NSPredicate predicateWithFormat:[formatFragments componentsJoinedByString:@" AND "]];
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}
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@interface RKFetchRequestManagedObjectCache ()
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@property (nonatomic, strong) NSCache *predicateCache;
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@end
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@implementation RKFetchRequestManagedObjectCache
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- (id)init
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{
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self = [super init];
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if (self) {
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self.predicateCache = [NSCache new];
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}
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return self;
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}
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- (NSSet *)managedObjectsWithEntity:(NSEntityDescription *)entity
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attributeValues:(NSDictionary *)attributeValues
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inManagedObjectContext:(NSManagedObjectContext *)managedObjectContext
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{
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NSAssert(entity, @"Cannot find existing managed object without a target class");
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NSAssert(attributeValues, @"Cannot retrieve cached objects without attribute values to identify them with.");
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NSAssert(managedObjectContext, @"Cannot find existing managed object with a nil context");
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NSString *predicateCacheKey = RKPredicateCacheKeyForAttributes([attributeValues allKeys]);
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NSPredicate *substitutionPredicate = [self.predicateCache objectForKey:predicateCacheKey];
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if (! substitutionPredicate) {
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substitutionPredicate = RKPredicateWithSubsitutionVariablesForAttributeValues(attributeValues);
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[self.predicateCache setObject:substitutionPredicate forKey:predicateCacheKey];
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}
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NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:[entity name]];
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fetchRequest.predicate = [substitutionPredicate predicateWithSubstitutionVariables:attributeValues];
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NSError *error = nil;
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NSArray *objects = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
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if (! objects) {
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RKLogError(@"Failed to execute fetch request due to error: %@", error);
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}
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RKLogDebug(@"Found objects '%@' using fetchRequest '%@'", objects, fetchRequest);
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return [NSSet setWithArray:objects];
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}
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@end
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