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::of method 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::of(function () {
$value = (yield createPromise('a'));
try {
$value = (yield createPromise($value . 'b'));
} catch (\Throwable $e) {
// The promise was rejected.
}
yield $value . 'c';
});
// Outputs "abc"
$promise->then(function ($v) { echo $v; });
- param callable $generatorFn Generator function to wrap into a promise.
- return \Promise
- see https://github.com/petkaantonov/bluebird/blob/master/API.md#generatorsinspiration
CloneableFinalInstantiable
Constants |
Methods |
public __construct(callable $generatorFn) |
public _handleFailure( $reason) : void
|
public _handleSuccess( $value) : void
|
public cancel() : void |
public getState() : string |
public static of(callable $generatorFn) : self Create a new coroutine. |
public otherwise(callable $onRejected) : GuzzleHttp |
public reject( $reason) : void |
public resolve( $value) : void |
public then(?callable $onFulfilled = NULL, ?callable $onRejected = NULL) : GuzzleHttp |
public wait(bool $unwrap = true) |
Properties |
private $currentPromise = NULL
|
private $generator = NULL
|
private $result = NULL
|
Methods |
private nextCoroutine( $yielded) : void |
Methods |
public static of(callable $generatorFn) : self Create a new coroutine. |