How is the mall flash sale implemented?

How is the mall flash sale implemented?

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Just your thoughts, thank you everyone!

Queue Optimistic Lock Pessimistic Lock

Set the upper limit for participating in flash sales. All requests exceeding the upper limit will be blocked.
The specific quantity of the flash sale upper limit requires stress testing.
Malicious IP requests will be blocked directly.

ajax sends a request to the backend, and the backend uses a queue to request the database.

At the same time, ajax keeps requesting the backend on the front end, and the backend returns success or failure of the flash sale.

You can use the redis queue to lock the inventory and generate an order. For example, if you have 100 stocks, then every time you add a shopping cart, you can start to calculate whether the length of the queue is greater than 100.

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