Tapestry - 基于后端事件更新UI

I am using Tapestry 4.1. I have a process running in the background. Once the process completes, I want to refresh a text in my UI. I am new to tapestry. It would be helpful if somebody can point out tapestry components I can use for this purpose.I am using Tapestry 4.1. I have a process runni