Re: Re: Domain-drive-design vs. Comman d pattern -- mutually exclusive?

Hi,

This was a great advice.
I've checked your link below and learned a few things.

Thank you,

*Joao Oliveira*
*Software Engineer*

*P:* +353 831 467 299 | *E: *[email protected]  | Connect with me
on Linkedin <http://ie.linkedin.com/in/jnicolau>

On Thu, Apr 30, 2015 at 3:31 PM [email protected]
[domaindrivendesign] <[email protected]> wrote:

>
>
> Hi
>
> Hope I undersand you correctly.
>
> Commands in DDD and CQRS is normally simple DTO's no behavior but simple
> data.
>
> But CommandHandlers Retireve the AggregateRoot that The Command is
> Supposed to Mutate.
>
> You can then invoke a method on the AggregateRoot Taking the command or
> some data of the command as argument.
>
> Its the responsibility of the aggragate root to check that all Domain
> rules are followed.
>
> It is the responsibility of the CommandHandler to retrieve the
> AggregateRoot, invoke a aggregateRoot method and save the aggregate root
>  state.
>
> If you use Domain events. Which I would highly recommend. The
> commandhandler can raise Domain events and publish them using a
> messageDispatcher.
>
> You can choose to model commandHandlers as standalone classes handling one
> command or you can choose to let a handling class handle multiple different
> commands.
>
> Other exiting variations exists when implementing event sourcing.
>
> Try to study Rinat Abdullin, Greg Young  but also Jan Kronquist
>
> Don't publish Domain Events, return them! - Jayway
> <http://www.jayway.com/2013/06/20/dont-publish-domain-events-return-them/>
>        [image: image]
> <http://www.jayway.com/2013/06/20/dont-publish-domain-events-return-them/>
>      Don't publish Domain Events, return them! - Jayway
> <http://www.jayway.com/2013/06/20/dont-publish-domain-events-return-them/>
> During a discussion around some of the code examples in Vaugn Vernon’s
> book Implementing Domain Driven Design we got stuck at what first appeared
> to be a ...
>       View on www.jayway.com
> <http://www.jayway.com/2013/06/20/dont-publish-domain-events-return-them/>
>   Preview by Yahoo
>
>
>
>
>  
>