On Tue, Mar 4, 2014 at 9:40 AM, delasoul <[email protected]> wrote:

> I have just read your answer below again and wonder how you would do this
>> without using channels?
>>
>    When replaying, the view/processor would resend the same events again,
> or am I missing something?
>

You mean when recovering the source processor? Then it should not publish
the Update messages. If it is event sourced that is by definition the case.
For a command sourced processor you can check if it is recovering and skip
the publish, or perhaps better add some scrubbing so that it doesn't
publish more than X Update messages per Y seconds.

The important thing is that the view is only updated by normal means, i.e.
Update message and auto-update-interval. Everything else is just
optimizations.

/Patrik


>  Also, it is probably not a good solution when the same event has to be
>> sent to more than one view (using auto update would of course fix this
>> problem...).
>>
>>
>> You can always use a view (option 3) or a destination/target processor
>> (options 1 and 2) that distribute their events to plain actors without
>> using channels. This way you save redundant journal updates or queries.
>>
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-- 

Patrik Nordwall
Typesafe <http://typesafe.com/> -  Reactive apps on the JVM
Twitter: @patriknw

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