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