How to do resource control in mvc?

Question

Suppose in a website like flipcart how can we control a product being purchased by 2 users if there is only one product available for sell .

is there any locking mechanism ?please let me know the logic .Thanks in advance.

Afzaal Ahmad Zeeshan · Answer

Yes look for who purchased it first! Compared their time of transaction then let one purchase it and show error message to another. You must consider reading more about Thread Safety . Thread safety allows you to hold the member values valid when they are being used by multiple threads. The problem you are talking about comes in action when multiple users access values and both of them use the same value to perform actions. Obviously in such cases the problem arises and the product may be wanted by both of them or one of them would be expecting a delivery but won't get it and so on and so forth. But you can overcome is by ensuring that the objects and members are thread safe. What language are you using? If that is C# you can use the locks to ensure thread-safety but then rises the problem of deadlock . ;-) Read both of the documentations and learn about them.