94 lines
2.8 KiB
PHP
94 lines
2.8 KiB
PHP
<?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 $value
|
||
* @throws \RuntimeException if the promise is already resolved.
|
||
*/
|
||
public function resolve($value);
|
||
|
||
/**
|
||
* Reject the promise with the given reason.
|
||
*
|
||
* @param mixed $reason
|
||
* @throws \RuntimeException if the promise is already resolved.
|
||
*/
|
||
public function reject($reason);
|
||
|
||
/**
|
||
* Cancels the promise if possible.
|
||
*
|
||
* @link https://github.com/promises-aplus/cancellation-spec/issues/7
|
||
*/
|
||
public function cancel();
|
||
|
||
/**
|
||
* 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.
|
||
*
|
||
* @param bool $unwrap
|
||
*
|
||
* @return mixed
|
||
* @throws \LogicException if the promise has no wait function or if the
|
||
* promise does not settle after waiting.
|
||
*/
|
||
public function wait($unwrap = true);
|
||
}
|