Promise (original) (raw)
scala.concurrent.Promise
See thePromise companion object
Promise is an object which can be completed with a value or failed with an exception.
A promise should always eventually be completed, whether for success or failure, in order to avoid unintended resource retention for any associated Futures' callbacks or transformations.
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Companion
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Members list
Future containing the value of this promise.
Future containing the value of this promise.
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Returns whether the promise has already been completed with a value or an exception.
Returns whether the promise has already been completed with a value or an exception.
Note: Using this method may result in non-deterministic concurrent programs.
Attributes
Returns
true if the promise is already completed, false otherwise
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Tries to complete the promise with either a value or the exception.
Tries to complete the promise with either a value or the exception.
Note: Using this method may result in non-deterministic concurrent programs.
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Returns
If the promise has already been completed returns false, or true otherwise.
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Completes the promise with either an exception or a value.
Completes the promise with either an exception or a value.
Value parameters
result
Either the value or the exception to complete the promise with. If the promise has already been fulfilled, failed or has timed out, calling this method will throw an IllegalStateException.
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Completes this promise with the specified future, once that future is completed.
Completes this promise with the specified future, once that future is completed.
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Returns
This promise
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Completes the promise with an exception.
Completes the promise with an exception.
Value parameters
cause
The throwable to complete the promise with. If the throwable used to fail this promise is an error, a control exception or an interrupted exception, it will be wrapped as a cause within an ExecutionException which will fail the promise. If the promise has already been fulfilled, failed or has timed out, calling this method will throw an IllegalStateException.
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Completes the promise with a value.
Completes the promise with a value.
Value parameters
value
The value to complete the promise with. If the promise has already been fulfilled, failed or has timed out, calling this method will throw an IllegalStateException.
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Tries to complete the promise with an exception.
Tries to complete the promise with an exception.
Note: Using this method may result in non-deterministic concurrent programs.
Attributes
Returns
If the promise has already been completed returns false, or true otherwise.
Source
Tries to complete the promise with a value.
Tries to complete the promise with a value.
Note: Using this method may result in non-deterministic concurrent programs.
Attributes
Returns
If the promise has already been completed returns false, or true otherwise.
Source
Attempts to complete this promise with the specified future, once that future is completed.
Attempts to complete this promise with the specified future, once that future is completed.
Attributes
Returns
This promise
Deprecated
[Since version 2.13.0] Since this method is semantically equivalent to `completeWith`, use that instead.
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