public ServerConfig setParameters(Map<String, String> parameters) {
        if (this.parameters == null) {
            this.parameters = new ConcurrentHashMap<String, String>();
            this.parameters.putAll(parameters);
        }
        return this;
    }
Sets virtualHost.

@param virtualHost the virtualHost
@return the virtualHost
core/api/src/main/java/com/alipay/sofa/rpc/config/ServerConfig.java