October 2017
Intermediate to advanced
442 pages
12h 33m
English
Content preview from Architecting Modern Java EE Applications
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Competing transactions
Another challenge that comes with CRUD-based models is to handle competing transactions. Business use cases that include the same domain entities and operate simultaneously need to ensure that the resulting state of the entities is consistent.
Editing a user's name and at the same time updating its account credit limit should not result in lost updates. The implementation has to ensure that the overall result of both transactions is still consistent.
Competing transactions that rely on optimistic locking usually result in failing transactions. This is definitely not ideal from a user's perspective, but at least maintains consistency, rather than suppressing that a transaction has been lost in space.
Following this approach, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.