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File / Folder	Size	Action
.	-
AggregateException.php	0.403KB	edt ren
CancellationException.php	0.204KB	edt ren
Coroutine.php	4.063KB	edt ren
Create.php	1.964KB	edt ren
Each.php	2.597KB	edt ren
EachPromise.php	7.415KB	edt ren
FulfilledPromise.php	1.995KB	edt ren
Is.php	0.919KB	edt ren
Promise.php	8.747KB	edt ren
PromiseInterface.php	2.757KB	edt ren
PromisorInterface.php	0.243KB	edt ren
RejectedPromise.php	2.213KB	edt ren
RejectionException.php	1.211KB	edt ren
TaskQueue.php	1.967KB	edt ren
TaskQueueInterface.php	0.439KB	edt ren
Utils.php	8.18KB	edt ren

<?php

declare(strict_types=1);

namespace 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
    ): 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
     * fulfilled.
     *
     * @param callable $onRejected Invoked when the promise is rejected.
     */
    public function otherwise(callable $onRejected): 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.
     *
     * @param mixed $value
     *
     * @throws \RuntimeException if the promise is already resolved.
     */
    public function resolve($value): void;

/**
     * Reject the promise with the given reason.
     *
     * @param mixed $reason
     *
     * @throws \RuntimeException if the promise is already resolved.
     */
    public function reject($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.
     *
     * @return mixed
     *
     * @throws \LogicException if the promise has no wait function or if the
     *                         promise does not settle after waiting.
     */
    public function wait(bool $unwrap = true);
}