protected function _workerCmd($workerCmd, $workerCount)
    {
        // Shell command builder
        $cmd = "{$workerCmd}/{$workerCount}";
        $cmd = ($this->logPath) ? "{$cmd} >> {$this->logPath}" : $cmd;

        // Process handler
        $process = proc_open("{$cmd} &", self::$_procDescriptorspec, $pipe);
        // Find out worker command's PID
        $status = proc_get_status($process);
        $pid = $status['pid'] + 1;
        // Stack workers
        $this->_pidStack[$workerCount] = $pid;
        // Close
        proc_close($process);

        // Log
        $time = date("Y-m-d H:i:s");
        $this->_log("Queue Listener - Dispatch Worker #{$workerCount} (PID: {$pid})");

        return true;
    }