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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 <[email protected]> * @author Márk Sági-Kazár <[email protected]> */ 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 $onFulfilled Called when a response will be available. * @param callable $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); }