| 1 |
efrain |
1 |
/**
|
|
|
2 |
Copyright 2018 Google Inc. All rights reserved.
|
|
|
3 |
|
|
|
4 |
Licensed under the Apache License, Version 2.0 (the "License");
|
|
|
5 |
you may not use this file except in compliance with the License.
|
|
|
6 |
You may obtain a copy of the License at:
|
|
|
7 |
|
|
|
8 |
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
9 |
|
|
|
10 |
Unless required by applicable law or agreed to in writing, software
|
|
|
11 |
distributed under the License is distributed on an "AS IS" BASIS,
|
|
|
12 |
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
|
13 |
See the License for the specific language governing permissions and
|
|
|
14 |
limitations under the License.
|
|
|
15 |
*/
|
|
|
16 |
|
|
|
17 |
#import "FBLPromise+Race.h"
|
|
|
18 |
|
|
|
19 |
#import "FBLPromise+Async.h"
|
|
|
20 |
#import "FBLPromisePrivate.h"
|
|
|
21 |
|
|
|
22 |
@implementation FBLPromise (RaceAdditions)
|
|
|
23 |
|
|
|
24 |
+ (instancetype)race:(NSArray *)promises {
|
|
|
25 |
return [self onQueue:self.defaultDispatchQueue race:promises];
|
|
|
26 |
}
|
|
|
27 |
|
|
|
28 |
+ (instancetype)onQueue:(dispatch_queue_t)queue race:(NSArray *)racePromises {
|
|
|
29 |
NSParameterAssert(queue);
|
|
|
30 |
NSAssert(racePromises.count > 0, @"No promises to observe");
|
|
|
31 |
|
|
|
32 |
NSArray *promises = [racePromises copy];
|
|
|
33 |
return [FBLPromise onQueue:queue
|
|
|
34 |
async:^(FBLPromiseFulfillBlock fulfill, FBLPromiseRejectBlock reject) {
|
|
|
35 |
for (id promise in promises) {
|
|
|
36 |
if (![promise isKindOfClass:self]) {
|
|
|
37 |
fulfill(promise);
|
|
|
38 |
return;
|
|
|
39 |
}
|
|
|
40 |
}
|
|
|
41 |
// Subscribe all, but only the first one to resolve will change
|
|
|
42 |
// the resulting promise's state.
|
|
|
43 |
for (FBLPromise *promise in promises) {
|
|
|
44 |
[promise observeOnQueue:queue fulfill:fulfill reject:reject];
|
|
|
45 |
}
|
|
|
46 |
}];
|
|
|
47 |
}
|
|
|
48 |
|
|
|
49 |
@end
|
|
|
50 |
|
|
|
51 |
@implementation FBLPromise (DotSyntax_RaceAdditions)
|
|
|
52 |
|
|
|
53 |
+ (FBLPromise * (^)(NSArray *))race {
|
|
|
54 |
return ^(NSArray *promises) {
|
|
|
55 |
return [self race:promises];
|
|
|
56 |
};
|
|
|
57 |
}
|
|
|
58 |
|
|
|
59 |
+ (FBLPromise * (^)(dispatch_queue_t, NSArray *))raceOn {
|
|
|
60 |
return ^(dispatch_queue_t queue, NSArray *promises) {
|
|
|
61 |
return [self onQueue:queue race:promises];
|
|
|
62 |
};
|
|
|
63 |
}
|
|
|
64 |
|
|
|
65 |
@end
|