On 27.02.14 08:47, Roland Kuhn wrote:
Very interesting discussion, thanks for bringing it up, Michael!
[more below]
26 feb 2014 kl. 16:47 skrev Martin Krasser <krass...@googlemail.com
<mailto:krass...@googlemail.com>>:
On 26.02.14 14:09, delasoul wrote:
But I really like the idea to also keep the view in memory when
needed, update it, shut it down when not used and bring it back
easily by replaying the corresponding processor or snapshotting
the view.
This is possible with all options 1-3 described above.
The combination of an eventsourced processor and a view would be
my preference, but as i said here I am struggling with the update
policy. In certain use cases it will be completely sufficient to
create and replay the view just on demand, but if keeping it in
memory it has to get updated
Depends on what inconsistency window your application is willing to
accept. You still can read any time from the view with eventual
consistency guarantees. Update(await = true) is only needed to
achieve strong read consistency. Furthermore, view updates are only
incremental updates (not full replays) so it may well be that in many
cases they're not too expensive.
A later useful extension to akka-persistence could be push-based
views (in addition to the current pull-based views). They are harder
to implement as they require distributed pub/sub that preserves
message order.
Yes, push-based views would indeed be a very natural extension of the
current capabilities. I assume that it is most efficiently implemented
with the help of the underlying journal, because otherwise it would
just be a shim on top which maybe amortizes some of the polling cost
by bundling calls together but which fundamentally is not “push”.
+1
Regards,
*Dr. Roland Kuhn*
/Akka Tech Lead/
Typesafe <http://typesafe.com/> – Reactive apps on the JVM.
twitter: @rolandkuhn
<http://twitter.com/#%21/rolandkuhn>
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