RollingCurl\RollingCurl::execute PHP 메소드

    public function execute()
    {
        $master = curl_multi_init();
        foreach ($this->multicurlOptions as $multiOption => $multiValue) {
            curl_multi_setopt($master, $multiOption, $multiValue);
        }
        // start the first batch of requests
        $firstBatch = $this->getNextPendingRequests($this->getSimultaneousLimit());
        // what a silly "error"
        if (count($firstBatch) == 0) {
            return;
        }
        foreach ($firstBatch as $request) {
            // setup the curl request, queue it up, and put it in the active array
            $ch = curl_init();
            $options = $this->prepareRequestOptions($request);
            curl_setopt_array($ch, $options);
            curl_multi_add_handle($master, $ch);
            $this->activeRequests[(int) $ch] = $request;
        }
        $active = null;
        // Use a shorter select timeout when there is something to do between calls
        $idleCallback = $this->idleCallback;
        $selectTimeout = $idleCallback ? 0.1 : 1.0;
        do {
            // ensure we're running
            $status = curl_multi_exec($master, $active);
            // see if there is anything to read
            while ($transfer = curl_multi_info_read($master)) {
                // get the request object back and put the curl response into it
                $key = (int) $transfer['handle'];
                $request = $this->activeRequests[$key];
                $request->setResponseText(curl_multi_getcontent($transfer['handle']));
                $request->setResponseErrno(curl_errno($transfer['handle']));
                $request->setResponseError(curl_error($transfer['handle']));
                $request->setResponseInfo(curl_getinfo($transfer['handle']));
                // remove the request from the list of active requests
                unset($this->activeRequests[$key]);
                // move the request to the completed set
                $this->completedRequests[] = $request;
                $this->completedRequestCount++;
                // start a new request (it's important to do this before removing the old one)
                if ($nextRequest = $this->getNextPendingRequest()) {
                    // setup the curl request, queue it up, and put it in the active array
                    $ch = curl_init();
                    $options = $this->prepareRequestOptions($nextRequest);
                    curl_setopt_array($ch, $options);
                    curl_multi_add_handle($master, $ch);
                    $this->activeRequests[(int) $ch] = $nextRequest;
                }
                // remove the curl handle that just completed
                curl_multi_remove_handle($master, $transfer['handle']);
                // if there is a callback, run it
                if (is_callable($this->callback)) {
                    $callback = $this->callback;
                    $callback($request, $this);
                }
                // if something was requeued, this will get it running/update our loop check values
                $status = curl_multi_exec($master, $active);
            }
            // Error detection -- this is very, very rare
            $err = null;
            switch ($status) {
                case CURLM_BAD_EASY_HANDLE:
                    $err = 'CURLM_BAD_EASY_HANDLE';
                    break;
                case CURLM_OUT_OF_MEMORY:
                    $err = 'CURLM_OUT_OF_MEMORY';
                    break;
                case CURLM_INTERNAL_ERROR:
                    $err = 'CURLM_INTERNAL_ERROR';
                    break;
                case CURLM_BAD_HANDLE:
                    $err = 'CURLM_BAD_HANDLE';
                    break;
            }
            if ($err) {
                throw new \Exception("curl_multi_exec failed with error code ({$status}) const ({$err})");
            }
            // Block until *something* happens to avoid burning CPU cycles for naught
            while (0 == curl_multi_select($master, $selectTimeout) && $idleCallback) {
                $idleCallback($this);
            }
            // see if we're done yet or not
        } while ($status === CURLM_CALL_MULTI_PERFORM || $active);
        curl_multi_close($master);
    }