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<?php
declare(strict_types=1);
namespace GuzzleHttp\Promise;
final class Each
{
/**
* Given an iterator that yields promises or values, returns a promise that
* is fulfilled with a null value when the iterator has been consumed or
* the aggregate promise has been fulfilled or rejected.
*
* $onFulfilled is a function that accepts the fulfilled value, iterator
* index, and the aggregate promise. The callback can invoke any necessary
* side effects and choose to resolve or reject the aggregate if needed.
*
* $onRejected is a function that accepts the rejection reason, iterator
* index, and the aggregate promise. The callback can invoke any necessary
* side effects and choose to resolve or reject the aggregate if needed.
*
* @param mixed $iterable Iterator or array to iterate over.
*/
public static function of(
$iterable,
?callable $onFulfilled = null,
?callable $onRejected = null
): PromiseInterface {
return (new EachPromise($iterable, [
'fulfilled' => $onFulfilled,
'rejected' => $onRejected,
]))->promise();
}
/**
* Like of, but only allows a certain number of outstanding promises at any
* given time.
*
* $concurrency may be an integer or a function that accepts the number of
* pending promises and returns a numeric concurrency limit value to allow
* for dynamic a concurrency size.
*
* @param mixed $iterable
* @param int|callable $concurrency
*/
public static function ofLimit(
$iterable,
$concurrency,
?callable $onFulfilled = null,
?callable $onRejected = null
): PromiseInterface {
return (new EachPromise($iterable, [
'fulfilled' => $onFulfilled,
'rejected' => $onRejected,
'concurrency' => $concurrency,
]))->promise();
}
/**
* Like limit, but ensures that no promise in the given $iterable argument
* is rejected. If any promise is rejected, then the aggregate promise is
* rejected with the encountered rejection.
*
* @param mixed $iterable
* @param int|callable $concurrency
*/
public static function ofLimitAll(
$iterable,
$concurrency,
?callable $onFulfilled = null
): PromiseInterface {
return self::ofLimit(
$iterable,
$concurrency,
$onFulfilled,
function ($reason, $idx, PromiseInterface $aggregate): void {
$aggregate->reject($reason);
}
);
}
}
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