Saga support
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Key: QI-262
URL: http://issues.ops4j.org/browse/QI-262
Project: Qi4j
Issue Type: New Feature
Reporter: Niclas Hedhman
Assignee: Rickard Öberg
Rickard wrote;
Another interesting thing once we have the EventSourcing in Qi4j is that
there's a complementary concept to Entities called Sagas, which basically
subscribe to events and perform business transactions, i.e. they create
commands in the event. But they also have identities, like entities. Here's a
good summary:
http://abdullin.com/journal/2010/9/26/theory-of-cqrs-command-handlers-sagas-ars-and-event-subscrip.html
It should be quite simple for us to create Saga's as special cases of
EntityComposite, and handle the event routing etc. I don't have any specific
usecase for it right now though, which is a problem. The closest for me is my
statistics handling for cases, where currently a service get an event and then
read the model to get all necessary statistics and publish it to a db. With
Sagas it could instead build up the necessary state within the Saga, as opposed
to getting it from the domain model (which should be for handling Commands
only, really).
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