Re: Sharing Aggregate Roots between Bounded Contexts

Buying ticket -> ticket bought -> (asynchronous) game bc denormalized
Play game (queries local) -> game played -> asynchronous points management
deducts

On Monday, May 27, 2013, Greg Young wrote:

> Your understanding is incorrect about events they are very often used to
> denormalize information from another context.
>
> On Monday, May 27, 2013, wonderfulworldofpingpong wrote:
>
> **
>
>
> Greg, thanks for the response.
>
> Are you advocating not to use a USER entity in every BC but any BC
> (Game/Food/Products) that needs to know the points make a GET CALL (query)
> to the Points management BC? That is possible. However, this makes the
> Game, Food, Products BC depend on the Points Management BC.
>
> You have to consider another important business rule here. That is, if the
> user does not have points he can't enter the section/stall. The Game BC can
> send an event to the points management BC, but the Game BC has to check the
> balance to allow or not the visitor. So the Game BC has to wait to complete
> the deduct points event, so to check the balance which makes the Game BC
> waiting.
>
> My understanding is that the events are for a pub/sub pattern like command
> processing and not for query.
>
> --- In [email protected], Greg Young <gregoryyoung1@...>
> wrote:
> >
> > Why not just make a call trydeductpointsforcstomer or get/remove points
> for
> > customer to points management?
> >
> > Or better make them all raise events?
> >
> > On Monday, May 27, 2013, wonderfulworldofpingpong wrote:
>
>  
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> Le doute n'est pas une condition agréable, mais la certitude est absurde.
>


-- 
Le doute n'est pas une condition agréable, mais la certitude est absurde.