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/**
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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+Any.h"
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#import "FBLPromise+Async.h"
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#import "FBLPromisePrivate.h"
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static NSArray *FBLPromiseCombineValuesAndErrors(NSArray<FBLPromise *> *promises) {
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NSMutableArray *combinedValuesAndErrors = [[NSMutableArray alloc] init];
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for (FBLPromise *promise in promises) {
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if (promise.isFulfilled) {
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[combinedValuesAndErrors addObject:promise.value ?: [NSNull null]];
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continue;
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}
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if (promise.isRejected) {
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[combinedValuesAndErrors addObject:promise.error];
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continue;
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}
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assert(!promise.isPending);
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};
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return combinedValuesAndErrors;
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}
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@implementation FBLPromise (AnyAdditions)
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+ (FBLPromise<NSArray *> *)any:(NSArray *)promises {
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return [self onQueue:FBLPromise.defaultDispatchQueue any:promises];
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}
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+ (FBLPromise<NSArray *> *)onQueue:(dispatch_queue_t)queue any:(NSArray *)anyPromises {
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NSParameterAssert(queue);
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NSParameterAssert(anyPromises);
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if (anyPromises.count == 0) {
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return [[FBLPromise alloc] initWithResolution:@[]];
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}
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NSMutableArray *promises = [anyPromises mutableCopy];
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return [FBLPromise
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onQueue:queue
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async:^(FBLPromiseFulfillBlock fulfill, FBLPromiseRejectBlock reject) {
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for (NSUInteger i = 0; i < promises.count; ++i) {
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id promise = promises[i];
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if ([promise isKindOfClass:self]) {
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continue;
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} else {
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[promises replaceObjectAtIndex:i
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withObject:[[FBLPromise alloc] initWithResolution:promise]];
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}
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}
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for (FBLPromise *promise in promises) {
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[promise observeOnQueue:queue
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fulfill:^(id __unused _) {
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// Wait until all are resolved.
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for (FBLPromise *promise in promises) {
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if (promise.isPending) {
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return;
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}
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}
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// If called multiple times, only the first one affects the result.
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fulfill(FBLPromiseCombineValuesAndErrors(promises));
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}
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reject:^(NSError *error) {
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BOOL atLeastOneIsFulfilled = NO;
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for (FBLPromise *promise in promises) {
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if (promise.isPending) {
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return;
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}
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if (promise.isFulfilled) {
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atLeastOneIsFulfilled = YES;
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}
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}
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if (atLeastOneIsFulfilled) {
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fulfill(FBLPromiseCombineValuesAndErrors(promises));
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} else {
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reject(error);
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}
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}];
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}
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}];
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}
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@end
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@implementation FBLPromise (DotSyntax_AnyAdditions)
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+ (FBLPromise<NSArray *> * (^)(NSArray *))any {
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return ^(NSArray *promises) {
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return [self any:promises];
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};
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}
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+ (FBLPromise<NSArray *> * (^)(dispatch_queue_t, NSArray *))anyOn {
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return ^(dispatch_queue_t queue, NSArray *promises) {
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return [self onQueue:queue any:promises];
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};
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}
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@end
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