/*
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* Copyright (c) 2014, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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@class BFTask<__covariant ResultType>;
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/*!
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A BFTaskCompletionSource represents the producer side of tasks.
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It is a task that also has methods for changing the state of the
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task by settings its completion values.
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*/
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@interface BFTaskCompletionSource<__covariant ResultType> : NSObject
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/*!
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Creates a new unfinished task.
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*/
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+ (instancetype)taskCompletionSource;
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/*!
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The task associated with this TaskCompletionSource.
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*/
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@property (nonatomic, strong, readonly) BFTask<ResultType> *task;
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/*!
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Completes the task by setting the result.
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Attempting to set this for a completed task will raise an exception.
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@param result The result of the task.
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*/
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- (void)setResult:(nullable ResultType)result NS_SWIFT_NAME(set(result:));
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/*!
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Completes the task by setting the error.
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Attempting to set this for a completed task will raise an exception.
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@param error The error for the task.
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*/
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- (void)setError:(NSError *)error NS_SWIFT_NAME(set(error:));
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/*!
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Completes the task by marking it as cancelled.
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Attempting to set this for a completed task will raise an exception.
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*/
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- (void)cancel;
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/*!
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Sets the result of the task if it wasn't already completed.
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@returns whether the new value was set.
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*/
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- (BOOL)trySetResult:(nullable ResultType)result NS_SWIFT_NAME(trySet(result:));
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/*!
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Sets the error of the task if it wasn't already completed.
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@param error The error for the task.
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@returns whether the new value was set.
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*/
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- (BOOL)trySetError:(NSError *)error NS_SWIFT_NAME(trySet(error:));
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/*!
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Sets the cancellation state of the task if it wasn't already completed.
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@returns whether the new value was set.
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*/
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- (BOOL)trySetCancelled;
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@end
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NS_ASSUME_NONNULL_END
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