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Autobat Thread Safety with a Callout - Need a reference from the DB but cant commit
Hey Guys,
I understand the inability to commit DB changes (no updates or inserts) before you can make a callout. This however is a monumental problem.....
Scenario:
Drupal passes personal and payment details to Salesforce via SOAP. Salesforce sends payment details to bank and returns message back to drupal with success or error.
Problem:
Because i cant commit anything to the database before making the call out there is no way for me to make the application thread safe as i need to reserve a unique reference for the payment (client wants sequential references).
So my question, is there a way for me to make this thread safe? e.g. how do i stop 2 website users sending in a payment at exactly the same time and the system using the same reference for both? Or is the only way i can do this is by making the client move away from sequential references and I construct one from some source or another?
Many thanks,
Chris