On 20.02.14 14:00, Patrik Nordwall wrote:
On Thu, Feb 20, 2014 at 1:47 PM, <d...@coinport.com
<mailto:d...@coinport.com>> wrote:
To create an order, we need to check balance first and if fund is
insufficient, no event will be generated;
To cancel an order, we need to check the order exists and is still
pending.
Anyway, my point is, there might be scenarios like this where two
EventsourcedProcessor might be necessary to co-exist and work
together though one or two channels in between. The current
limitation prevents an EventsourcedProcessor form sitting behind a
PersistentChannel...
I think you have a good point. I don't know how difficult it would be
to support it,
that's a minor addition to let ConfirmablePersistent messages through.
OTOH, letting to (eventsourced) processors communicate with each other
via channels smells like someone wants to extend a consistency boundary
beyond a single actor, especially if state of actor A needs to be
checked to conditionally update state of actor B and vice versa (as in
the given example). In this case, both processors should be collapsed
into a single one.
but feel free to create a ticket and we will investigate it. The least
we can do is to document the limitation (well, it's already documented
in the ScalaDoc) and how to work around it.
/Patrik
On Thursday, February 20, 2014 6:17:46 PM UTC+8, Martin Krasser
wrote:
Why don't you let M2 handle createOrder and cancelOrder
commands and
emit orderCreated and orderCanceled events to M1? This way you
could use
EventsourcedProcessor to implement M2 and a Processor to
implement M1.
On the other hand, it's a bit difficult to give an advise here
without
knowing validation, consistency and other requirements
On 20.02.14 08:40, dong wrote:
> Martin, let me figure out a empale to make my point.
>
> Suppose my app is a trading platform, it has two memory
based models -
> account balances (M1), and pending orders (M2). The
> deposit/withdraw/createOrder commands shall be handled by
M1, lets say
> after processing a 'crateOrder' event, it reduced the
account balance,
> and then sent a 'OrderCreated' event to M2 for updating
pending order
> set. On the order hand, cancelOrder commands are handled by M2
> directly and after an order is cancelled, M2 needs to send
an event to
> M1 to increase the balance (in case an order doesn't exist,
no event
> is ever persisted).
>
> In such a use case, both M1 and M2 shall be Eventsourced
processors,
> and I'd like them to work together. Does this make any sense?
--
Martin Krasser
blog: http://krasserm.blogspot.com
code: http://github.com/krasserm
twitter: http://twitter.com/mrt1nz
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Patrik Nordwall
Typesafe <http://typesafe.com/> - Reactive apps on the JVM
Twitter: @patriknw
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