Web Service based application - Cache as a Master Data Source

[vss123]

Hi,

We want to develop a shopping web-application that interacts with system(s) of many vendors. It could be thro. web-services or any other means.

Moreover, vendors can register themselves and the data will be stored in DB.
Now, when the customer searches data from vendors in DB as well as other vendors have to be shown.

So, we have planned to use 'cache as a master data source'. The proposed architecture is attached.

1) Will it work?

2) How to implement this with J2EE (Spring & Hibernate)?

3) Sites like redbus.in, makeMyTrip.com have similar functionality. So, what is the standard way to do that?