CloudI\API::callback PHP Method

    private function callback($command, $name, $pattern, $request_info, $request, $timeout, $priority, $trans_id, $pid)
    {
        if ($this->request_timeout_adjustment) {
            $this->request_timer = microtime(true);
            $this->request_timeout = $timeout;
        }
        if (!isset($this->callbacks[$pattern])) {
            $function = array($this, 'null_response');
        } else {
            $function_queue =& $this->callbacks[$pattern];
            $function = array_shift($function_queue);
            $function_queue[] = $function;
        }
        switch ($command) {
            case MESSAGE_SEND_ASYNC:
                try {
                    $response = call_user_func($function, API::$ASYNC, $name, $pattern, $request_info, $request, $timeout, $priority, $trans_id, $pid);
                    if (is_array($response)) {
                        assert(count($response) == 2);
                        $response_info = $response[0];
                        $response = $response[1];
                        if (!is_string($response_info)) {
                            $response_info = '';
                        }
                    } else {
                        $response_info = '';
                    }
                    if (!is_string($response)) {
                        $response = '';
                    }
                } catch (InvalidInputException $e) {
                    throw $e;
                } catch (MessageDecodingException $e) {
                    throw $e;
                } catch (TerminateException $e) {
                    throw $e;
                } catch (ReturnAsyncException $e) {
                    return;
                } catch (ForwardAsyncException $e) {
                    return;
                } catch (ReturnSyncException $e) {
                    echo "{$e->getMessage()}\n{$e}\n";
                    assert(false);
                    return;
                } catch (ForwardSyncException $e) {
                    echo "{$e->getMessage()}\n{$e}\n";
                    assert(false);
                    return;
                } catch (\Exception $e) {
                    echo "{$e->getMessage()}\n{$e}\n";
                    $response_info = '';
                    $response = '';
                }
                try {
                    $this->return_async($name, $pattern, $response_info, $response, $timeout, $trans_id, $pid);
                } catch (ReturnAsyncException $e) {
                }
                return;
            case MESSAGE_SEND_SYNC:
                try {
                    $response = call_user_func($function, API::$SYNC, $name, $pattern, $request_info, $request, $timeout, $priority, $trans_id, $pid);
                    if (is_array($response)) {
                        assert(count($response) == 2);
                        $response_info = $response[0];
                        $response = $response[1];
                        if (!is_string($response_info)) {
                            $response_info = '';
                        }
                    } else {
                        $response_info = '';
                    }
                    if (!is_string($response)) {
                        $response = '';
                    }
                } catch (InvalidInputException $e) {
                    throw $e;
                } catch (MessageDecodingException $e) {
                    throw $e;
                } catch (TerminateException $e) {
                    throw $e;
                } catch (ReturnSyncException $e) {
                    return;
                } catch (ForwardSyncException $e) {
                    return;
                } catch (ReturnAsyncException $e) {
                    echo "{$e->getMessage()}\n{$e}\n";
                    assert(false);
                    return;
                } catch (ForwardAsyncException $e) {
                    echo "{$e->getMessage()}\n{$e}\n";
                    assert(false);
                    return;
                } catch (\Exception $e) {
                    echo "{$e->getMessage()}\n{$e}\n";
                    $response_info = '';
                    $response = '';
                }
                try {
                    $this->return_sync($name, $pattern, $response_info, $response, $timeout, $trans_id, $pid);
                } catch (ReturnSyncException $e) {
                }
                return;
            default:
                throw new MessageDecodingException();
        }
    }