public function bindHandler($commandName, $handler)
    {
        // If the $handler given is an instance of CommandHandler, simply bind that
        if ($handler instanceof CommandHandler) {
            $this->handlers[$commandName] = $handler;
            return;
        }

        // If the handler given is callable, wrap it up in a CallableCommandHandler for executing later
        if (is_callable($handler)) {
            return $this->bindHandler($commandName, new CallableCommandHandler($handler));
        }

        // If the handler given is a string, wrap it up in a LazyLoadingCommandHandler for loading later
        if (is_string($handler)) {
            return $this->bindHandler($commandName, new LazyLoadingCommandHandler($handler, $this->container));
        }

        throw new \InvalidArgumentException('Could not push handler. Command Handlers should be an
            instance of Chief\CommandHandler, a callable, or a string representing a CommandHandler class');
    }