public function run($command, $args = array())
    {
        $process = $this->getProcess($command, $args);

        if ($this->logger) {
            $this->logger->info(sprintf('run command: %s "%s" ', $command, implode(' ', $args)));
            $before = microtime(true);
        }

        $process->run();

        $output = $process->getOutput();

        if ($this->logger && $this->debug) {
            $duration = microtime(true) - $before;
            $this->logger->debug(sprintf('last command (%s) duration: %sms', $command, sprintf('%.2f', $duration * 1000)));
            $this->logger->debug(sprintf('last command (%s) return code: %s', $command, $process->getExitCode()));
            $this->logger->debug(sprintf('last command (%s) output: %s', $command, $output));
        }

        if (!$process->isSuccessful()) {
            $error = sprintf("error while running %s\n output: \"%s\"", $command, $process->getErrorOutput());

            if ($this->logger) {
                $this->logger->error($error);
            }

            if ($this->debug) {
                throw new ProcessException($process);
            }

            return;
        }

        return $output;
    }