akkadotnet/akka.net

Port of Akka actors for .NET

Damian Reeves

@DamianReeves

funny... I'm a contributor to that project

I was starting to be afraid Even is solving a problem that streams and persistence query solves, but in practice I see it solves an actual need

Andrey Leskov

@andreyleskov

From my point of view right now akka persistent journals really need possibility to subscribe to all persisted events as stream : akkadotnet/akka.net#2321

it will help a lot

Damian Reeves

@DamianReeves

Yeah I'm really interested in the projection story of persistent journals... Even gives us this but its not mature, I'm starting to wonder if we just need to add Reactive Streams support to even, but honestly though I get Rx I haven't quite grokked Reactive Streams yet

I think this convo is inspiring me to do a spike on Even (that and I've found myself re-implementing functionality I know Even has in an Akka based CQRS service we are building)

Andrey Leskov

@andreyleskov

I'm using simplified approach for projection - just pub\sub via EventBus \ DistributedPubSub and will gladly look at more convinient approaches

Nicola Atorino

@NicolaAtorino

Good day everyone! I started working on akka a little time ago, and I'm here for a question regarding snapshot and serialization.
I am working with the AtLeastOnceDeliveryReceiveActor, and i need to serialize my own state object toghether with the AtLeastOnceDeliverySnapshot. The documentation of the object itself says that this is possible by wrapping the object itself in another one containing my custom state, and that the AtLeastOnceDeliverySnapshot should be serialized as a blob and stored in the state object for later retrieval. The problem is that the AtLeastOnceDeliverySnapshot is not marked as serializable so I cannot use the .net binaryformatter. Any Idea how to overcome this ?

Vagif Abilov

@object

TWIMC: Had to lock Akka.Persistence.Sql.Common version to 1.1.1, the newest one (1.1.2) wasn't compatible with Akka.Persistence.SqlServer that is not yet updated to 1.1.2.

Andrew Buttigieg

@andrewbuttigieg

Hi all, bit of a question regarding TestKit. I have written a number of unit tests against several of actors in a project. Now all of these tests have ExpectNoMsg(); with everything set to default. This means that the tests are run sequentially and take 3 seconds each. With five tests, the test runner is taking 20 seconds, is there a way to parallelise the execution of these tests?

Bartosz Sypytkowski

@Horusiath

@NicolaAtorino the best option is not to use binary formatter - it's one of the slowest serializers you can imagine on .net

@object afaik akka.persistence.sqlserver PR for upgrade to v1.1.2 is merged to /dev, just not released yet

@andrewbuttigieg this depends on the test runner you're using. Xunit v2+ should have parallel builds by default

Andrew Young

@ayoung

does anyone know how to setup a broadcast group to send messages to actors that have a remote actor path? the path is like akka://clooster/remote/akka.tcp/clooster@127.0.0.1:6766/user/deployer/consistenthashrouter/c2

Andrew Buttigieg

@andrewbuttigieg

@Horusiath I am using NUnit 2x.

So maybe a setting from NUnit itself?

Bartosz Sypytkowski

@Horusiath

@andrewbuttigieg I haven't used NUnit for a while. Nonetheless it's more matter of test runner than akka testkit itself

Andrew Young

@ayoung

@Horusiath know anything about my remote path question above?

Andrey Leskov

@andreyleskov

@Horusiath does it mean that Akka.Persistence.SqlServer 1.1.2 is availalbe in nighly builds ?

Bartosz Sypytkowski

@Horusiath

@andreyleskov I don't know, if you companion plugins have nightly builds, but the best way is to check it out

Nicola Atorino

@NicolaAtorino

@Horusiath thank you for your answer. The akka documentation says to serialize the atleastoncedeliverysnapshot in a byte array, and I tried also protobuf-net but it requires all type and subtype to be mapped beforehand. This is not possible because i canot know the kind of messages that the snapshot will contain inside beforehand. So how can i serialize that kind of object? How does akka.net manage this thing internally? Does it ever serialize object in a byteArray ?

Bartosz Sypytkowski

@Horusiath

@ayoung you're trying to send a message to remotely deployed actor by pinning it to a router, this sounds like overcomplicating things

@NicolaAtorino you can try to use Wire serializer (which will we the default serializer from v1.5 anyway) or just use something json-based

btw. what's wrong with serializing atleastoncedelivery snapshots right now?

Nicola Atorino

@NicolaAtorino

@Horusiath we are using a custom serializer instead of wire because we have elastic as a persistence db (wire serialized object do not work well with it), and this custom serializer has problems with the snapshot object (especially, the actorPath subtype)

@Horusiath since i need my own state obj as a wrapper around the snapshot, i was following the documentation that ways to store the snapshot as a byteArray in a property of my own stateobj. And that's the reason i needed a bynarySerialization in the first place

but now i am thinking that instead of using a byteArray i can store it as a string, and use explicitly the wireserialization that should be able to work with that.

Bartosz Sypytkowski

@Horusiath

every akka serializer is capable of serializing object ot byte arrays

even if you have stream serializers, you can sent them MemoryStream and get byte array from it

Nicola Atorino

@NicolaAtorino

in fact now i will try to use programmatically the ActorSystem.Serialization class

it works well. thank you @Horusiath

Bartosz Sypytkowski

@Horusiath

np ;)

Andrew Buttigieg

@andrewbuttigieg

@Horusiath Ended up using XUnit and I can run parallel test from different assemblies so it solve what I was trying to do

Daniel D'Agostino

@dandago2_twitter

Web crawler sample documentation says: "You also want to make sure you include your Akka.NET HOCON configuration inside Web.config, that way you can take advantage of Web.config Configuration Transformations in combination with HOCON."

is it actually possible to do config transforms on the HOCON?

Peter Bergman

@peter-bannerflow

@dandago2_twitter Not sure if you can do transformations inside the hocon, but you can always replace the whole section with another hocon...

Daniel D'Agostino

@dandago2_twitter

that's kind of radical, it's like saying replace a whole Web.config with another... but good point

it would be nice to be able to tweak specific properties per environment

Arjen Smits

@Danthar

@dandago2_twitter What i have done is provide a base config in the normal hocon config section

and during app initialisation provide the override or fallback facilities of the hocon config system, to replace or inject environment specifics

these specifics can then be provided through any means you want. I use an app-setting and have my deployment CI env put in the right stuff during deployment.

ofcourse, if your deployment env can substitute variables in your config, you can do that with the whole base hocon config as well ofcourse

but i like to keep a seperation between the base stuff that applies to all instances, and the env specific stuff

Daniel D'Agostino

@dandago2_twitter

that's a really interesting approach; is there an example somewhere of how to do these overrides?

Bartosz Sypytkowski

@Horusiath

@dandago2_twitter hoconConfig.WithFallback(fallbackHoconConfig)

if some key was not found in hoconConfig, it will be searched in fallbackHoconConfig

Daniel D'Agostino

@dandago2_twitter

typically we put HOCON in the Web.config and it gets pulled automatically, so where does that hoconConfig part actually go?

Arjen Smits

@Danthar

where ever you want

you could put it in an appsetting value in your config

and read it from there

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