swiggy

Steps to follow:

1. Choose the option number from the list
2. Enter the id/timing as integer values.
3. To check for restaurants enter the time you want to select.

NOTE: Before checking for restaurants at a specific time, please update the cache for that time as a continous service is not running for updating the cache. Enter all values as int only.

Sample Output:

What would you like to do

1. Enter new restaurant
2. Enter holiday timings
3. Check restaurants for current time
4. Update cache for the given time
5. Exit choose -1 1 Enter the restaurant id as int 1 Please enter the timings of the restaurant Enter the number of timing values 2 Enter the opening time 1 Enter the closing time 7 Enter the opening time 13 Enter the closing time 17 What would you like to do
6. Enter new restaurant
7. Enter holiday timings
8. Check restaurants for current time
9. Update cache for the given time
10. Exit choose -1 4 Enter the time for which cache should be updated 1 Updating the cache for current time period Cache updated What would you like to do
11. Enter new restaurant
12. Enter holiday timings
13. Check restaurants for current time
14. Update cache for the given time
15. Exit choose -1 3 Enter the current time 3 Restaurant 1 open What would you like to do
16. Enter new restaurant
17. Enter holiday timings
18. Check restaurants for current time
19. Update cache for the given time
20. Exit choose -1 2 Enter the restaurant id as int 1 Please enter the timings of the restaurant Enter the start time 3 Enter the end time 4 What would you like to do
21. Enter new restaurant
22. Enter holiday timings
23. Check restaurants for current time
24. Update cache for the given time
25. Exit choose -1 4 Enter the time for which cache should be updated 3 Updating the cache for current time period Cache updated What would you like to do
26. Enter new restaurant
27. Enter holiday timings
28. Check restaurants for current time
29. Update cache for the given time
30. Exit choose -1 3 Enter the current time 3 Restaurant 1 closed will open at 4

For Scale (Not 100% sure this is the optimal way to do it): We can run a periodic service/cron jobs that just updates the cache at that interval or we can have a lambda function trigger a cache update whenever the time is the same as the starttime of updateState. For caching we can use a redis cache.