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declare (strict_types=1);
namespace YoastSEO_Vendor\GuzzleHttp\Promise;
* A promise represents the eventual result of an asynchronous operation.
* The primary way of interacting with a promise is through its then method,
* which registers callbacks to receive either a promise’s eventual value or
* the reason why the promise cannot be fulfilled.
* @see https://promisesaplus.com/
interface PromiseInterface
public const PENDING = 'pending';
public const FULFILLED = 'fulfilled';
public const REJECTED = 'rejected';
* Appends fulfillment and rejection handlers to the promise, and returns
* a new promise resolving to the return value of the called handler.
* @param callable $onFulfilled Invoked when the promise fulfills.
* @param callable $onRejected Invoked when the promise is rejected.
public function then(callable $onFulfilled = null, callable $onRejected = null) : \YoastSEO_Vendor\GuzzleHttp\Promise\PromiseInterface;
* Appends a rejection handler callback to the promise, and returns a new
* promise resolving to the return value of the callback if it is called,
* or to its original fulfillment value if the promise is instead
* @param callable $onRejected Invoked when the promise is rejected.
public function otherwise(callable $onRejected) : \YoastSEO_Vendor\GuzzleHttp\Promise\PromiseInterface;
* Get the state of the promise ("pending", "rejected", or "fulfilled").
* The three states can be checked against the constants defined on
* PromiseInterface: PENDING, FULFILLED, and REJECTED.
public function getState() : string;
* Resolve the promise with the given value.
* @throws \RuntimeException if the promise is already resolved.
public function resolve($value) : void;
* Reject the promise with the given reason.
* @throws \RuntimeException if the promise is already resolved.
public function reject($reason) : void;
* Cancels the promise if possible.
* @see https://github.com/promises-aplus/cancellation-spec/issues/7
public function cancel() : void;
* Waits until the promise completes if possible.
* Pass $unwrap as true to unwrap the result of the promise, either
* returning the resolved value or throwing the rejected exception.
* If the promise cannot be waited on, then the promise will be rejected.
* @throws \LogicException if the promise has no wait function or if the
* promise does not settle after waiting.
public function wait(bool $unwrap = \true);