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<?php
declare(strict_types=1);
namespace Http\Client\Common\HttpClientPool;
use Http\Client\Common\Exception\HttpClientNotFoundException;
use Http\Client\Common\HttpClientPool as HttpClientPoolInterface;
use Http\Client\HttpAsyncClient;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* A http client pool allows to send requests on a pool of different http client using a specific strategy (least used,
* round robin, ...).
*/
abstract class HttpClientPool implements HttpClientPoolInterface
{
/**
* @var HttpClientPoolItem[]
*/
protected $clientPool = [];
/**
* Add a client to the pool.
*
* @param ClientInterface|HttpAsyncClient $client
*/
public function addHttpClient($client): void
{
// no need to check for HttpClientPoolItem here, since it extends the other interfaces
if (!$client instanceof ClientInterface && !$client instanceof HttpAsyncClient) {
throw new \TypeError(
sprintf('%s::addHttpClient(): Argument #1 ($client) must be of type %s|%s, %s given', self::class, ClientInterface::class, HttpAsyncClient::class, get_debug_type($client))
);
}
if (!$client instanceof HttpClientPoolItem) {
$client = new HttpClientPoolItem($client);
}
$this->clientPool[] = $client;
}
/**
* Return an http client given a specific strategy.
*
* @throws HttpClientNotFoundException When no http client has been found into the pool
*
* @return HttpClientPoolItem Return a http client that can do both sync or async
*/
abstract protected function chooseHttpClient(): HttpClientPoolItem;
/**
* {@inheritdoc}
*/
public function sendAsyncRequest(RequestInterface $request)
{
return $this->chooseHttpClient()->sendAsyncRequest($request);
}
/**
* {@inheritdoc}
*/
public function sendRequest(RequestInterface $request): ResponseInterface
{
return $this->chooseHttpClient()->sendRequest($request);
}
}