give user only a certain time to complete a transaction, like 5 minutes no other transaction process

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Need to come up with a way to "temp hold" inventory and give user only a certain time to complete a transaction, like 5 minutes;
Problem is 2 people booking same inventory at the same time. How can we make sure this does not happen?
a). Can we "temp hold" the inventory for the first user and if they do not book within 5 minutes, release the hold or something simiilar?

please help me

Posted 3-Feb-14 19:13pm

joti parkash

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CoderPanda · Answer 1 · 2014-02-03T19:35:00

I have implemented it the following way long time ago. See if it works for you.
Flow
1. Customer visits product catalog page.
2. Customer selects one or more items and adds them to the shopping cart.
3. Each time an item is added to the cart,
A stored proc is invoked to reduce the quantity of that item by 1 in the Inventory table.
The shopping cart for this user is kept in 'Awaiting Payment' Status in ShoppingCart Table.
4. Customer makes payment. Cart goes to 'Payment Completed' Status.
OR
Customer doesn't make payment and leaves. Cart stays in 'Awaiting Payment' Status for 2 hrs(configurable).
5. Every 5 minutes
a 'BookingCleanup' stored procedure runs (via a SQL job)
that goes to ShoppingCart table
converts all Carts in 'Awaiting Payment' status for more than 2hrs to 'Cancelled'
increases quantity by 1 in the Inventory table for each item in the cart
6. Meanwhile in these 5 minutes some more customers may have viewed this item and would have seen an 'Out Of Stock' message on the site. Those customer IDs are captured and emails are sent out by another scheduled job to tell them that the product is now back in stock.

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