Eventual consistency and 1 to n relationships

Hi,

In my domain I have Product and Order aggregates. Orders reference Products.
This is a 1 to n relationship, so a Product has many Orders and Orders
belong to a Product. When a Product is discontinued a ProductDiscontinued
event is published and all Orders that belong to this Product must be
cancelled. So there's an adapter that receives the ProductDiscontinued event
via RabbitMQ. The adapters then delegates cancelling Orders to an
application service. How can I achieve that a single Order is cancelled in a
single transaction? Should the adapter iterate over all Orders for the
discontinued Product and call the application service for every single
Order? Should I just ignore that I modify more than one aggregate in a
single transaction and call the application service just once with a list of
all affected OrderIds? Or is there a better solution?

Many thanks,

Dirk



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Posted by: dirk g <[email protected]>
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