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<?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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