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Description:
Discussions about DDD, CQRS, and Event Sourcing
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ES and external services
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How do you handle something like an event sources app that relies on a rules engine? For example, I have events from a year ago where decisions were made by the rules engine. However, today, the rules engine changes - in such a way that the events of the past would be 'different'. How do you handle this? If you have services on which your events depend,... more »
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ES, Multiple BCs and Ordering in Read Store
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Hello all, my first post here. I have read quite a few of the older posts - so if this is clearly answered somewhere I have not yet crossed it. Given two BCs is it at all possible to create a read model in one BC that accurately represents the state of both - in an event sourced scenario? Users Bounded Context - Manages user accounts, profiles, etc.... more »
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DDD + Event sourcing: inheritance and events
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In my domain model, there are multiple type of credit transactions, that have complex life cycles. Let's call them to simplify CreditType1, CreditType2 and CreditType3. The thing is, all credit types share the same behavior, the only thing that changes is some displaying data, but that's not important here.... more »
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Partial Event Sourcing (ES + CRUD)
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Hi, long time follower, first time poster... I am working on understanding the nuances of event sourcing. For the project I am working on I see a lot of benefit in moving to this approach. What I am having trouble with is not event sourcing everything. I get that ES is overkill for CRUD but there are quite a few objects in the database... more »
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CQRS - Event versioning approach- Good or Bad?
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Hi all, We are at a point in our development cycle (asp.net mvc application), where we need to introduce changes to our existing commands and events (say adding/removing a few properties etc). Its a message driven CQRS system (no event sourcing) I have been trying to find a way to introduce commands/events versioning in... more »
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Where should the validation be?
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Hi, I would like to have your advice on where should I put or not put a validation. Let's take the Order example, I have a command CreateOrder which is supposed to create an order and takes in parameters; - Quantity, - Price, - Product. Now if I would want to make a validation check on the quantity saying; the... more »
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Reliable CQRS "framework"... new member of this great group
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Hello guys, thank you for this group. Much needed. I am very sold on CQRS and DDD. I have done a couple of projects, small-garage-projects, and i feel pretty comfortable I can switch over this "principles" for my future projects. This is the deal. I am in charge of a large application ( i didn't create... more »
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References to events sourcing implementations
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Hey
I am looking for any case studies of successful (and failed) event sourcing
implementations in the wild. LMAX is one of the newest and best documented.
Anybody knows other solid sources?
Szymon
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