Ncqrs is an open source CQRS (Command Query Responsibility Segregation) framework built on .NET.
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Questions tagged [ncqrs]
16 questions
117
votes
5 answers
Difference between CQRS and CQS
I am learning what is CQRS pattern and came to know there is also CQS pattern.
When I tried to search I found lots of diagrams and info on CQRS but didn't found much about CQS.
Key point in CQRS pattern
In CQRS there is one model to write (command…
Mr punch
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50
votes
6 answers
CQRS without Event Sourcing - what are the drawbacks?
Besides missing some of the benefits of Event Sourcing, are there any other drawbacks to adapting an existing architecture to CQRS without the Event Sourcing piece?
I'm working on large application and the developers should be able to handle…
BuddyJoe
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32
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2 answers
What difference between NEventStore and EventStoreDB
Recently I'm learning CQRS and want to change my system to use event-sourcing patterns.
But I found that on .Net platform, there is two Event Store implementations.
NEventStore(formerly JOliver EventStore)
EventStoreDB(from EventStore.com)
The two…
JasonMing
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5
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3 answers
DDD with .NET - Is there common infrastructure library available?
We're starting a web application using DDD and CQRS (using the ncqrs framework) and before we get started writing our own infrastructure class library, i wanted to see if any are already available.
I'd think at least some basic interfaces and…
jaminto
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3
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2 answers
Ncqrs: How to raise an Event without having an Aggregate Root
Given I have two Bounded Contexts:
Fleet Mgt - simple CRUD-based supporting sub-domain
Sales - which is my CQRS-based Core Domain
When a CRUD operation occurs in the fleet management, an event reflecting the operation should be…
Dennis Traub
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2
votes
3 answers
requesting data from the readmodel in command handler
I have the need to send an email to a list of admins as a response to
a command sent from the UI. The admins that need to be notified are
retrieved from a query against the read model.
At the moment - from my understanding as it stands I only have…
user156888
2
votes
2 answers
Benefits of Ncqrs snapshots?
In preparation of a future application design, I've started some investigations on CQRS-style applications and especially Ncqrs.
While most concepts are quite clear, I'm a bit confused by the concept of a snapshot.
I can see why rebuilding an object…
Steve B
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2
votes
3 answers
Guid of created aggregate root in CQRS
Looking at this code from here:
[Serializable]
public class CreateClientCommand : Command
{
public string ClientName { get; private set; }
public string Street { get; private set; }
public string StreetNumber { get; private set; }
…
cs0815
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2
votes
1 answer
Reporting in the CQRS/ES world
I think I understand the idea of the read model in the context of ES + CQRS (please correct me if not). However, I still have a few doubts about using it in the context of ‘serious’ reporting. Let us say I use a relational db plus some ORM to crud…
cs0815
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vote
3 answers
Ncqrs recreate the complete ReadModel
Using Ncqrs, is there a way to replay every single event ever happened (all aggregate types) and feed these through my denormalizers in order to recreate the whole read model from scratch?
Edit:
I though it's be good to provide a more specific use…
Kristoffer Lindvall
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vote
1 answer
Ncqrs: How to store events as part of test set-up
How do I store events as part of setting up my tests?
Currently I'm initializing application state by sending commands like this:
Given some commands were sent
When sending another command
Then some events should have been published
I'm using…
Dennis Traub
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1
vote
1 answer
reporting in cqrs - unforeseen stats
I understand that basic stats in the read model can be computed on the fly as events from the domain model are generated. Does this really work for more complicated situations? What happens if new stats are required in the future - do you run past…
cs0815
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0
votes
1 answer
NCQRS: how do you load from the domain?
Take the standard registration process:
user signs up
user is sent email with link activate account
user activates account
the issue i'm talking about is:
when we create the initial account we store the username, password, email, activation…
user156888
0
votes
3 answers
MVC strongly-typed view, and server side setting properties before sending to lower layers?
I have a layered application that send commands to the business layer (actually, the application is based on ncqrs framework, but I don't think it's important here).
A command looks like this :
public class RegisterUserCommand : CommandBase
{
…
Steve B
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0
votes
1 answer
NServiceBus and Generic Event Types
I am doing some work using the NCQRS frameworks and NServiceBus 3.3.4. I have been struggling with getting some subscriptions to fire and as far as I can tell all my config is 100% correct.
After some digging I noticed that the MessageType name…
Ross Jones
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