function coroutine in Zircon Profile 8

Same name and namespace in other branches

1. 8.0 vendor/guzzlehttp/promises/src/functions.php \GuzzleHttp\Promise\coroutine()

Creates a promise that is resolved using a generator that yields values or promises (somewhat similar to C#'s async keyword).

When called, the coroutine function will start an instance of the generator and returns a promise that is fulfilled with its final yielded value.

Control is returned back to the generator when the yielded promise settles. This can lead to less verbose code when doing lots of sequential async calls with minimal processing in between.

use GuzzleHttp\Promise;

function createPromise($value) { return new Promise\FulfilledPromise($value); }

$promise = Promise\coroutine(function () { $value = (yield createPromise('a')); try { $value = (yield createPromise($value . 'b')); } catch (\Exception $e) { // The promise was rejected. } yield $value . 'c'; });

// Outputs "abc" $promise->then(function ($v) { echo $v; });

@link https://github.com/petkaantonov/bluebird/blob/master/API.md#generators inspiration

Parameters

callable $generatorFn Generator function to wrap into a promise.:

Return value

Promise

File

vendor/guzzlehttp/promises/src/functions.php, line 473

Namespace

GuzzleHttp\Promise

Code

function coroutine(callable $generatorFn) {
  $generator = $generatorFn();
  return __next_coroutine($generator
    ->current(), $generator)
    ->then();
}