Retrieves the value of the promise, suspending the fiber running the action until the result is available.
Completes the promise with the result of the specified effect.
Completes the promise with the result of the specified effect. If the promise has already been completed, the method will produce false.
Note that Promise.completeWith will be much faster, so consider using that if you do not need to memoize the result of the specified effect.
Completes the promise with the specified effect.
Completes the promise with the specified effect. If the promise has already been completed, the method will produce false.
Note that since the promise is completed with an effect, the effect will
be evaluated each time the value of the promise is retrieved through
combinators such as await
, potentially producing different results if
the effect produces different results on subsequent evaluations. In this
case te meaning of the "exactly once" guarantee of Promise
is that the
promise can be completed with exactly one effect. For a version that
completes the promise with the result of an effect see
Promise.complete.
Kills the promise with the specified error, which will be propagated to all fibers waiting on the value of the promise.
Exits the promise with the specified exit, which will be propagated to all fibers waiting on the value of the promise.
Fails the promise with the specified error, which will be propagated to all fibers waiting on the value of the promise.
Halts the promise with the specified cause, which will be propagated to all fibers waiting on the value of the promise.
Completes the promise with interruption.
Completes the promise with interruption. This will interrupt all fibers waiting on the value of the promise.
Checks for completion of this Promise.
Checks for completion of this Promise. Produces true if this promise has already been completed with a value or an error and false otherwise.
Completes immediately this promise and returns optionally it's result.
Completes the promise with the specified value.
Alias for Promise.complete
Alias for Promise.complete
(Since version 1.0.0) use Promise.complete
A promise represents an asynchronous variable, of zio.IO type, that can be set exactly once, with the ability for an arbitrary number of fibers to suspend (by calling
await
) and automatically resume when the variable is set.Promises can be used for building primitive actions whose completions require the coordinated action of multiple fibers, and for building higher-level concurrent or asynchronous structures.