vendor/guzzlehttp/promises/src/PromiseInterface.php

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<?php

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.
 *
 * @link https://promisesaplus.com/
 */
interface PromiseInterface
{
    const PENDING = 'pending';
    const FULFILLED = 'fulfilled';
    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.
     *
     * @return PromiseInterface
     */
    public function then(
        callable $onFulfilled = null,
        callable $onRejected = null
    );

    /**
     * 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.
     *
     * @return PromiseInterface
     */
    public function otherwise(callable $onRejected);

    /**
     * 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.
     *
     * @return string
     */
    public function getState();

    /**
     * Resolve the promise with the given value.
     *
     * @param mixed $value
     *