Re: How-to implement the e-Commerce-System found in the "IDDD" book

I was when I started this thread unsure if the process of creating
3 BCs was worth the extra work.
But  I am already getting some help here on how-to build the models so this must be good (-: 

Yes the invoicing needs to historicly store its data. I therefore
could use a read database schema for this. 

 Most of my invoice logic takes place when "creating" an invoice. The user kind of works in a excel sheet (ajax enriched form) where he can turn on and off lots of knobs. Since the created invoice may need to refer to past invoices I am not sure if the read database might even complicate things.(Also the ajax Interface by no means is a task oriented interface)
Scenarios like create invoice A. publish Event "Invoice A created"
create Invoice B that refers to Invoice A. But maybe Invoice A hasnt been yet saved to the read database. But on the other hand a read database architecture does also seem very helpfull for dealing with
historical data.....

 
--- In [email protected], Greg Young <gregoryyoung1@...> wrote:
>
> There is no suc thing as fresh information.
> 
> On Monday, June 3, 2013, Mauro Servienti wrote:
> 
> > **
> >
> >
> > But, if in your scenario makes sense to regenerate the order each time it
> > is opened you can issue a query to the product BC, via a service exposed by
> > the product BC using a dedicated read model for the order - product
> > communication, in any case the order aggregate does not need the product
> > aggregate for this task.
> >
> > The problem you have to face is: since you can totally isolate (different
> > processes on different servers) BCs what happens when you query for an
> > order and the product BC is not available?
> >
> > There are scenario in which makes sense that the order is available with
> > stale information and other where you need all the time as much as possible
> > fresh information and others where you _must_ have fresh information.
> >
> > .m
> >
> > -----Original Message-----
> > From: [email protected] <javascript:_e({}, 'cvml',
> > 'domaindrivendesign%40yahoogroups.com');> [mailto:
> > [email protected] <javascript:_e({}, 'cvml',
> > 'domaindrivendesign%40yahoogroups.com');>] On Behalf Of
> > wonderfulworldofpingpong
> > Sent: luned� 3 giugno 2013 22.43
> > To: [email protected] <javascript:_e({}, 'cvml',
> > 'domaindrivendesign%40yahoogroups.com');>
> > Subject: [domaindrivendesign] Re: How-to implement the e-Commerce-System
> > found in the "IDDD" book
> >
> > I don't agree to this. Regenerating an order requires a query to the BC
> > that contains the Product.
> >
> > > - Independency: Order-BC should not depend on the availability of the
> > Product-BC to work;
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >  
> >
> 
> 
> -- 
> Le doute n'est pas une condition agr�able, mais la certitude est absurde.
>




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