Current File : /home2/selectio/www/fms-worksuite/vendor/amphp/amp/lib/LazyPromise.php
<?php
namespace Amp;
/**
* Creates a promise that calls $promisor only when the result of the promise is requested (i.e. onResolve() is called
* on the promise). $promisor can return a promise or any value. If $promisor throws an exception, the promise fails
* with that exception. If $promisor returns a Generator, it will be run as a coroutine.
*/
final class LazyPromise implements Promise
{
/** @var callable|null */
private $promisor;
/** @var Promise|null */
private $promise;
/**
* @param callable $promisor Function which starts an async operation, returning a Promise (or any value).
* Generators will be run as a coroutine.
*/
public function __construct(callable $promisor)
{
$this->promisor = $promisor;
}
/**
* {@inheritdoc}
*/
public function onResolve(callable $onResolved)
{
if ($this->promise === null) {
\assert($this->promisor !== null);
$provider = $this->promisor;
$this->promisor = null;
$this->promise = call($provider);
}
\assert($this->promise !== null);
$this->promise->onResolve($onResolved);
}
}
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