Issues/concurrency

[dpfaffenbauer]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no

The Problem we have quite often now is:

• The Notify and the Capture Request come simultaneously
• The Notify and Capture Controller read the Payment and update the same old Payment at quite the same time
• These leads to a lot of issues: The workflow gets executed multiple times, States mess up, emails being sent multiple times, etc.
• To fix this: We have to WRITE_LOCK the payment for the being of the request. This assures us that the second request, doesn't get to read the payment until the first one is finished. Since Payum doesn't support this out-of-the-box, we have to a be a bit tricky to do it....