vendor/guzzle/guzzle/src/Guzzle/Http/Curl/CurlMultiProxy.php

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<?php

namespace Guzzle\Http\Curl;

use Guzzle\Common\AbstractHasDispatcher;
use Guzzle\Http\Message\RequestInterface;

/**
 * Proxies requests and connections to a pool of internal curl_multi handles. Each recursive call will add requests
 * to the next available CurlMulti handle.
 */
class CurlMultiProxy extends AbstractHasDispatcher implements CurlMultiInterface
{
    protected $handles = array();
    protected $groups = array();
    protected $queued = array();
    protected $maxHandles;
    protected $selectTimeout;

    /**
     * @param int   $maxHandles The maximum number of idle CurlMulti handles to allow to remain open
     * @param float $selectTimeout timeout for curl_multi_select
     */
    public function __construct($maxHandles = 3, $selectTimeout = 1.0)
    {
        $this->maxHandles = $maxHandles;
        $this->selectTimeout = $selectTimeout;
        // You can get some weird "Too many open files" errors when sending a large amount of requests in parallel.
        // These two statements autoload classes before a system runs out of file descriptors so that you can get back
        // valuable error messages if you run out.
        class_exists('Guzzle\Http\Message\Response');
        class_exists('Guzzle\Http\Exception\CurlException');
    }

    public function add(RequestInterface $request)
    {
        $this->queued[] = $request;

        return $this;
    }

    public function all()
    {
        $requests = $this->queued;
        foreach ($this->handles as $handle) {
            $requests = array_merge($requests, $handle->all());
        }

        return $requests;
    }

    public function remove(RequestInterface $request)
    {
        foreach ($this->queued as $i => $r) {
            if ($request === $r) {
                unset($this->queued[$i]);
                return true;
            }
        }