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// Copyright 2017 Google // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License.
#import "Private/FIRAppAssociationRegistration.h"
#import <objc/runtime.h>
@implementation FIRAppAssociationRegistration
+ (nullable id)registeredObjectWithHost:(id)host key:(NSString *)key creationBlock:(id _Nullable (^)(void))creationBlock { @synchronized(self) { SEL dictKey = @selector(registeredObjectWithHost:key:creationBlock:); NSMutableDictionary<NSString *, id> *objectsByKey = objc_getAssociatedObject(host, dictKey); if (!objectsByKey) { objectsByKey = [[NSMutableDictionary alloc] init]; objc_setAssociatedObject(host, dictKey, objectsByKey, OBJC_ASSOCIATION_RETAIN_NONATOMIC); } id obj = objectsByKey[key]; NSValue *creationBlockBeingCalled = [NSValue valueWithPointer:dictKey]; if (obj) { if ([creationBlockBeingCalled isEqual:obj]) { [NSException raise:@"Reentering registeredObjectWithHost:key:creationBlock: not allowed" format:@"host: %@ key: %@", host, key]; } return obj; } objectsByKey[key] = creationBlockBeingCalled; obj = creationBlock(); objectsByKey[key] = obj; return obj; } }
@end
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