How the ATG Order flow manages a transaction

See more about ATG Tx management @ http://tips4ufromsony.blogspot.com/2012/05/atg-how-to-use-transaction-manager.html

Most of the ATG Commerce form handlers extend atg.commerce.order.purchase.PurchaseProcessFormHandler. The transaction management pattern in order flow is implemented through this form handler’s beforeSet, afterSet, and handler methods.

The transaction will be started @ beforeSet method and is ended @ afterSet method.

In general, the design pattern for updating an order is as follows:

Acquire lock-manager write lock on profile id from the /atg/commerce/order/LocalLockManager
Begin Transaction
Synchronize on the Order object.
Modify Order
Call ((OrderImpl) pOrder).updateVersion(); --> atg.commerce.order.InvalidVersionException is thrown based on this
Call OrderManager.updateOrder()
Release Order synchronization
End Transaction
Release lock-manager write lock on profile id from the /atg/commerce/order/LocalLockManager

If you extend atg.commerce.order.purchase.PurchaseProcessFormHander, then steps 1,2,8 & 9 are done for you in the beforeSet and afterSet method implementations. Steps 3&7 are no longer strictly necessary, but are still good practice. Steps 3-7 should be performed manually in your application code.

Find below the screen shot of ATG doc with this details :

Find more info @ http://docs.oracle.com/cd/E23507_01/Platform.20073/ATGCommProgGuide/html/s0907preparingacomplexorderforcheckou01.html

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