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<?php
namespace Http\Promise;
/**
* Promise represents a value that may not be available yet, but will be resolved at some point in future.
* It acts like a proxy to the actual value.
*
* This interface is an extension of the promises/a+ specification.
*
* @see https://promisesaplus.com/
*
* @author Joel Wurtz <joel.wurtz@gmail.com>
* @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
*/
interface Promise
{
/**
* Promise has not been fulfilled or rejected.
*/
const PENDING = 'pending';
/**
* Promise has been fulfilled.
*/
const FULFILLED = 'fulfilled';
/**
* Promise has been rejected.
*/
const REJECTED = 'rejected';
/**
* Adds behavior for when the promise is resolved or rejected (response will be available, or error happens).
*
* If you do not care about one of the cases, you can set the corresponding callable to null
* The callback will be called when the value arrived and never more than once.
*
* @param callable|null $onFulfilled called when a response will be available
* @param callable|null $onRejected called when an exception occurs
*
* @return Promise a new resolved promise with value of the executed callback (onFulfilled / onRejected)
*/
public function then(callable $onFulfilled = null, callable $onRejected = null);
/**
* Returns the state of the promise, one of PENDING, FULFILLED or REJECTED.
*
* @return string
*/
public function getState();
/**
* Wait for the promise to be fulfilled or rejected.
*
* When this method returns, the request has been resolved and if callables have been
* specified, the appropriate one has terminated.
*
* When $unwrap is true (the default), the response is returned, or the exception thrown
* on failure. Otherwise, nothing is returned or thrown.
*
* @param bool $unwrap Whether to return resolved value / throw reason or not
*
* @return mixed Resolved value, null if $unwrap is set to false
*
* @throws \Exception the rejection reason if $unwrap is set to true and the request failed
*/
public function wait($unwrap = true);
}