| commit | author | age | ||
| bad748 | 1 | /* |
| W | 2 | * Copyright (c) 2014, Facebook, Inc. |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This source code is licensed under the BSD-style license found in the | |
| 6 | * LICENSE file in the root directory of this source tree. An additional grant | |
| 7 | * of patent rights can be found in the PATENTS file in the same directory. | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| 11 | #import <Foundation/Foundation.h> | |
| 12 | ||
| 13 | NS_ASSUME_NONNULL_BEGIN | |
| 14 | ||
| 15 | @class BFTask<ResultType>; | |
| 16 | ||
| 17 | /*! | |
| 18 | A BFTaskCompletionSource represents the producer side of tasks. | |
| 19 | It is a task that also has methods for changing the state of the | |
| 20 | task by settings its completion values. | |
| 21 | */ | |
| 22 | @interface BFTaskCompletionSource<__covariant ResultType> : NSObject | |
| 23 | ||
| 24 | /*! | |
| 25 | Creates a new unfinished task. | |
| 26 | */ | |
| 27 | + (instancetype)taskCompletionSource; | |
| 28 | ||
| 29 | /*! | |
| 30 | The task associated with this TaskCompletionSource. | |
| 31 | */ | |
| 32 | @property (nonatomic, strong, readonly) BFTask<ResultType> *task; | |
| 33 | ||
| 34 | /*! | |
| 35 | Completes the task by setting the result. | |
| 36 | Attempting to set this for a completed task will raise an exception. | |
| 37 | @param result The result of the task. | |
| 38 | */ | |
| 39 | - (void)setResult:(nullable ResultType)result; | |
| 40 | ||
| 41 | /*! | |
| 42 | Completes the task by setting the error. | |
| 43 | Attempting to set this for a completed task will raise an exception. | |
| 44 | @param error The error for the task. | |
| 45 | */ | |
| 46 | - (void)setError:(NSError *)error; | |
| 47 | ||
| 48 | /*! | |
| 49 | Completes the task by setting an exception. | |
| 50 | Attempting to set this for a completed task will raise an exception. | |
| 51 | @param exception The exception for the task. | |
| 52 | */ | |
| 53 | - (void)setException:(NSException *)exception; | |
| 54 | ||
| 55 | /*! | |
| 56 | Completes the task by marking it as cancelled. | |
| 57 | Attempting to set this for a completed task will raise an exception. | |
| 58 | */ | |
| 59 | - (void)cancel; | |
| 60 | ||
| 61 | /*! | |
| 62 | Sets the result of the task if it wasn't already completed. | |
| 63 | @returns whether the new value was set. | |
| 64 | */ | |
| 65 | - (BOOL)trySetResult:(nullable ResultType)result; | |
| 66 | ||
| 67 | /*! | |
| 68 | Sets the error of the task if it wasn't already completed. | |
| 69 | @param error The error for the task. | |
| 70 | @returns whether the new value was set. | |
| 71 | */ | |
| 72 | - (BOOL)trySetError:(NSError *)error; | |
| 73 | ||
| 74 | /*! | |
| 75 | Sets the exception of the task if it wasn't already completed. | |
| 76 | @param exception The exception for the task. | |
| 77 | @returns whether the new value was set. | |
| 78 | */ | |
| 79 | - (BOOL)trySetException:(NSException *)exception; | |
| 80 | ||
| 81 | /*! | |
| 82 | Sets the cancellation state of the task if it wasn't already completed. | |
| 83 | @returns whether the new value was set. | |
| 84 | */ | |
| 85 | - (BOOL)trySetCancelled; | |
| 86 | ||
| 87 | @end | |
| 88 | ||
| 89 | NS_ASSUME_NONNULL_END | |
