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Jan 26, 2016
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Add promise resolution type #80

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Add promise resolution type, closes #79
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@sagikazarmark
sagikazarmark authored and Márk Sági-Kazár committed Jan 26, 2016
commit b17faa4bda3e602b84ea6712392b0e554083fcf7
15 changes: 11 additions & 4 deletions components/promise.rst
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Promise
=======

When sending asynchronous HTTP requests, a promise is returned. The promise acts
as a proxy for the response or error result, which is not yet known.
A promise represents a single result of an asynchronous operation.
It is not necessarily available at a specific time, but should become in the future.

The PHP-HTTP promise follows the `Promises/A+`_ standard.

.. note::
Expand All @@ -13,8 +14,11 @@ The PHP-HTTP promise follows the `Promises/A+`_ standard.
Asynchronous requests
---------------------

Asynchronous requests enable non-blocking HTTP operations. To execute such a
request with HTTPlug::
Asynchronous requests enable non-blocking HTTP operations.
When sending asynchronous HTTP requests, a promise is returned. The promise acts
as a proxy for the response or error result, which is not yet known.

To execute such a request with HTTPlug::

$request = $messageFactory->createRequest('GET', 'http://php-http.org');

Expand All @@ -27,6 +31,9 @@ request with HTTPlug::

See :ref:`message-factory` on how to use message factories.

Although the promise itself is not restricted to resolve a specific result type,
in HTTP context it resolves a PSR-7 ``Psr\Http\Message\ResponseInterface`` or fails with an ``Http\Client\Exception``.

Wait
----

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