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65 lines
2.1 KiB
65 lines
2.1 KiB
/**
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Copyright 2018 Google Inc. All rights reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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#import "FBLPromise+Race.h"
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#import "FBLPromise+Async.h"
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#import "FBLPromisePrivate.h"
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@implementation FBLPromise (RaceAdditions)
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+ (instancetype)race:(NSArray *)promises {
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return [self onQueue:self.defaultDispatchQueue race:promises];
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}
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+ (instancetype)onQueue:(dispatch_queue_t)queue race:(NSArray *)racePromises {
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NSParameterAssert(queue);
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NSAssert(racePromises.count > 0, @"No promises to observe");
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NSArray *promises = [racePromises copy];
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return [FBLPromise onQueue:queue
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async:^(FBLPromiseFulfillBlock fulfill, FBLPromiseRejectBlock reject) {
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for (id promise in promises) {
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if (![promise isKindOfClass:self]) {
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fulfill(promise);
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return;
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}
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}
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// Subscribe all, but only the first one to resolve will change
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// the resulting promise's state.
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for (FBLPromise *promise in promises) {
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[promise observeOnQueue:queue fulfill:fulfill reject:reject];
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}
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}];
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}
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@end
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@implementation FBLPromise (DotSyntax_RaceAdditions)
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+ (FBLPromise * (^)(NSArray *))race {
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return ^(NSArray *promises) {
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return [self race:promises];
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};
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}
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+ (FBLPromise * (^)(dispatch_queue_t, NSArray *))raceOn {
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return ^(dispatch_queue_t queue, NSArray *promises) {
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return [self onQueue:queue race:promises];
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};
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}
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@end
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