58 lines
2.2 KiB
ReStructuredText
58 lines
2.2 KiB
ReStructuredText
Dependency Injection
|
|
====================
|
|
|
|
WellRESTed strives to play nicely with other code and not force developers into using any specific libraries or frameworks. As such, WellRESTed does not provide a dependency injection container, nor does it require you to use a specific container (or any).
|
|
|
|
This section describes the recommended way of using WellRESTed with Pimple_, a common dependency injection container for PHP.
|
|
|
|
Imaging we have a ``FooHandler`` that depends on a ``BarInterface``, and ``BazInterface``. Our handler looks something like this:
|
|
|
|
.. code-block:: php
|
|
|
|
class FooHandler implements RequestHandlerInterface
|
|
{
|
|
private $bar;
|
|
private $baz;
|
|
|
|
public function __construct(BarInterface $bar, BazInterface $bar)
|
|
{
|
|
$this->bar = $bar;
|
|
$this->baz = $baz;
|
|
}
|
|
|
|
public function handle(ServerRequestInterface $request): ResponseInterface
|
|
{
|
|
// Do something with the bar and baz and return a response...
|
|
// ...
|
|
}
|
|
}
|
|
|
|
We can register the handler and these dependencies in a Pimple_ service provider.
|
|
|
|
.. code-block:: php
|
|
|
|
class MyServiceProvider implements ServiceProviderInterface
|
|
{
|
|
public function register(Container $c)
|
|
{
|
|
// Register the Bar and Baz as services.
|
|
$c['bar'] = function ($c) {
|
|
return new Bar();
|
|
};
|
|
$c['baz'] = function ($c) {
|
|
return new Baz();
|
|
};
|
|
|
|
// Register the Handler as a protected function. When you use
|
|
// protect, Pimple returns the function itself instead of the return
|
|
// value of the function.
|
|
$c['fooHandler'] = $c->protect(function () use ($c) {
|
|
return new FooHandler($c['bar'], $c['baz']);
|
|
});
|
|
}
|
|
}
|
|
|
|
By "protecting" the ``fooHandler`` service, we are delaying the instantiation of the ``FooHandler``, the ``Bar``, and the ``Baz`` until the handler needs to be dispatched. This works because we're not passing instance of ``FooHandler`` when we register this with a router, we're passing a function to it that does the instantiation on demand.
|
|
|
|
.. _Pimple: https://pimple.symfony.com/
|