response constructor
Consumer(1 second)
response queue
4. 1 synch
3. push request
5.1 monitor the response queue
Seller Sprite
1. check product data
update request status to 4.2 queue
request producter
Product Service
call
5.2 fetch
request queue
2.1 fetch from cache
Data Management Service
Executors
Mobiles
3. drop
6 send back the result
2.2 return directly
