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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+Async.h"
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#import "FBLPromisePrivate.h"
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@implementation FBLPromise (AsyncAdditions)
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+ (instancetype)async:(FBLPromiseAsyncWorkBlock)work {
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return [self onQueue:self.defaultDispatchQueue async:work];
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}
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+ (instancetype)onQueue:(dispatch_queue_t)queue async:(FBLPromiseAsyncWorkBlock)work {
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NSParameterAssert(queue);
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NSParameterAssert(work);
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FBLPromise *promise = [[FBLPromise alloc] initPending];
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dispatch_group_async(FBLPromise.dispatchGroup, queue, ^{
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work(
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^(id __nullable value) {
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if ([value isKindOfClass:[FBLPromise class]]) {
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[(FBLPromise *)value observeOnQueue:queue
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fulfill:^(id __nullable value) {
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[promise fulfill:value];
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}
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reject:^(NSError *error) {
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[promise reject:error];
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}];
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} else {
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[promise fulfill:value];
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}
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},
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^(NSError *error) {
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[promise reject:error];
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});
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});
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return promise;
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}
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@end
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@implementation FBLPromise (DotSyntax_AsyncAdditions)
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+ (FBLPromise* (^)(FBLPromiseAsyncWorkBlock))async {
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return ^(FBLPromiseAsyncWorkBlock work) {
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return [self async:work];
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};
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}
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+ (FBLPromise* (^)(dispatch_queue_t, FBLPromiseAsyncWorkBlock))asyncOn {
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return ^(dispatch_queue_t queue, FBLPromiseAsyncWorkBlock work) {
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return [self onQueue:queue async:work];
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};
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}
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@end
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