任何人都可以帮我完成以下问题的图表 [英] Could anyone help me to complete the diagram for the below problem

问题描述

假设您正在开发一个显示银行网站货币汇率的网络应用程序。费率存储在银行的IBM大型机中，费率可通过网络服务获得。每次用户访问费率页面时，该页面都会向主机发出请求。这会在主机上产生过多的负载。特别是在大多数情况下，交付的费率是相同的。但同时费率可能在一天内波动，如果费率发生变化，网页不应显示缓存的值，而是向Web服务发出另一个请求。大型机的费率表支持触发器，其中每个对费率表的更新都可以调用触发器，其中触发器可以进一步调用Web服务。您将如何设计这样的缓存架构并确保它在速率变化时无效？请通过绘制图解释。



谢谢

Hadley

Assume that you are developing a web application that shows currency exchange rates for a bank web site. The rates are stored in an IBM Mainframe in the bank and rates are available through web services. Each time a user accesses the rates page, the page makes a request to the mainframe. This generates too much load on the mainframe. Especially most of the time the rates delivered is the same. But at the same time rates may fluctuate within the day and if rates have changed the web page should not display the cached values but make another request to the web service. The rates table at mainframe supports triggers where each update to the rates table can invoke a trigger where the trigger may further call a web service. How would you design such a caching architecture and make sure it is invalidated on rate changes? Please explain by drawing a diagram.

Thanks
Hadley

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