Re: [akka-user] Event Adapters and custom journals

[Patrik Nordwall]

On Wed, Aug 10, 2016 at 1:13 PM, Daniel Stoner 
wrote:

> Hi all,
>
> Having read the docs on EventAdapters (http://doc.akka.io/docs/akka/
> 2.4.9-RC2/java/persistence.html#event-adapters-java) and seeing the
> example of how to ignore particular classes I thought this would be a
> perfect solution for me.
>
> Having implemented the example I have tried to the following the
> application.conf example where event-adapter is defined inside the
> 'journal.inmem' config location (EG The location specified by
> journal.plugin value). As such I have:
>
> persistence {
> journal {
> plugin = "com.osp.scs.libnado.persistence.dynamodb"
> }
> ..more things
> }
>
> com.osp.scs.libnado.persistence.dynamodb {
> event-adapters {
> class-not-found = "com.osp.scs.libnado.akka.codec.
> ClassNotFoundEventAdapter"
>   }
>   event-adapter-bindings {
> "com.osp.scs.libnado.akka.codec.JacksonSerializable" =
> class-not-found
>   }
> }
>
> Now it has suddenly occurred to me (since this isn't working) that
> actually event adaptation is something that has to be implemented in each
> Journal implementation that exists and not something that Akka is providing
> before it gets to the journal itself.
>
> Is this the case or am I just putting my config in the wrong place?
> If the former the documentation on how to write your own custom Journal
> may need updating to reflect the intended requirement to support this
> feature.
>

That is true. The TCK should also cover it. Please create an issue, and a
pull request would be great.


>
> Further - are there any shortcuts for implementing the requirements such
> as there is with Serialization and the serialisation-bindings and other
> assorted config working. EG You just utilise SerializationExtension.get(
> system).serialize(entity).
>

Persistence.get(system).adaptersFor


>
> Thanks kindly,
> Daniel Stoner
> --
> Daniel Stoner | Senior Software Engineer UtopiaIT | Ocado Technology
> daniel.sto...@ocado.com | Ext 7969 | www.ocadotechnology.com
>
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-- 

Patrik Nordwall
Akka Tech Lead
Lightbend  -  Reactive apps on the JVM
Twitter: @patriknw

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Re: [akka-user] Akka Actor

[Kenji Kobayashi]

Sure I did have a Progress Message via the main actor which call to the 
workerActor to return current progress, but the user is able to call the 
endpoint over and over again, that meaning I need some indicator whether 
the actor has finished or still running.

More or less like this schema..

User1 -> End Point -> Main Actor fires tasks to workers (mainActor ? 
startProcess)

User2 -> End Point -> Main Actor fires tasks to workers if not already 
started... etc...

I recently thought of using future.onCompleted, so as long if the 
future.onCompleted returns false that shows the progress is still running 
but somehow it won't work that way

On Friday, August 12, 2016 at 7:20:22 PM UTC+7, Justin du coeur wrote:
>
> Sure, but there's nothing built in -- you'd have to roll something 
> yourself.
>
> The most obvious way to do it is to add a Progress message, which the 
> outside system strobes to mainActor, say, once a second, and which 
> mainActor responds with the current state of the processing.  (I do a much 
> more involved version of this for my UIs, when they are doing long 
> operations that may take tens or hundreds of seconds, so I can show a 
> progress bar.)
>
> But there are lots of ways to slice this problem -- the right one will 
> depend on your specific problem and environment...
>
> On Fri, Aug 12, 2016 at 6:36 AM, Kenji Kobayashi  > wrote:
>
>> Currently I have rest-endpoint-api-playframework that contains main actor 
>> to run n number of worker-actors doing batch-insertion. while in the 
>> process of doing that, I'd love to get current process of the inserts, lets 
>> say 100/1000. in order to do that, obviously I'll have the actor to report 
>> to the sender what is the status of the process.
>>
>> class Application (implicit inj : Injector) extends Controller with 
>> Injectable {
>>   implicit val timeout = Timeout(5 seconds)
>>   val mainActor = system.actorOf(RoundRobinPool(100).props(Props(new 
>> SupervisorActor(0))), name = "helloactor")
>>
>>   val future = mainActor ? ProcessBatch  
>>
>>   val workerFuture = mainActor ? CurrentProcessedItem
>>   result = Await.result(workerFuture, timeout.duration).asInstanceOf[String] 
>>
>>   Ok(Json.obj("return"->result.toString))  }
>>
>> above, I'd expect that if helloActor ? ProcessBatch has completed, then 
>> I'd just return the process is completed, otherwise I'd run the mainActor 
>> ? CurrentProcessedItem that returns a future of the currentProcessedItem.
>>
>> So basically I will need an indicator whether mainActor ? ProcessBatch has 
>> completed or not. is it possible?
>>
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>
>

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[akka-user] Access Denied Downloading standalone akka_2.11-2.4.9-RC2.zip

[murtuza chhil]

Hello, 

Get an error  downloading  latest standalone release from page 
http://akka.io/downloads/

The zip downlod link is 
http://downloads.typesafe.com/akka/akka_2.11-2.4.9-RC2.zip?_ga=1.68079190.614045507.1468130713

Error page Content

AccessDeniedAccess 
Denied4E93081229D790D5hTqKBgBzP1ydnHywim1E/9e/YrVnhfWyZQ+m39zdiIqoJMrd+VwOLyCBQ+pTw4DX5vByBmimSBs=

​

-chhil

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[akka-user] What means of akka cluster roles leader?

[Yutao Shuai]

What this function means? Select a nodes with specfic roles as the cluster 
leader or every roles has its leader?

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[akka-user] ConductR sandbox linking to another container

[Chris Baxter]

I don't know of any ConductR user group or forum out there, so I am asking 
here.  I am playing around with the ConductR sandbox on my Mac and I want 
to be able to have my 3 ConductR nodes communicate with Cassandra which is 
running in another local container.  Usually, this can be accomplished with 
links (--link) being established when starting up the containers.  But it 
seems that you cannot use the --link option when running the sandbox via 
"sandbox run ...".  I know you can deploy Cassandra as another bundle into 
ConductR but I don't want to go that route.  Does anyone have any expertise 
or suggestions on being able to setup a networking link between a ConductR 
node's container in sandbox and my Cassandra container?

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[akka-user] Basic Akka stream server not receiving data sent by client

[murtuza chhil]

Hi,

I have a simple client that reads a csv file and send it across. When I 
have a netcat server I can see the data come through.

However when I have a Akka stream based server I do see the connection but 
I don't see the data come through. 

Could someone be kind enough to let me know where I have screwed up?

Server code 


ActorSystem system = ActorSystem.create("System");
ActorMaterializer mat = ActorMaterializer.create(system);

Source> serverSource 
= Tcp
.get(system).bind("127.0.0.1", 6000);
serverSource.runForeach(
conn -> {
System.out.println(conn.remoteAddress());
Sink receiveSink = conn
.flow()
.via(Framing.delimiter(
ByteString.fromString("\r\n"), 10))
.to(Sink.foreach(str -> {
System.out.println("< " + str);
// Thread.sleep(10);
}));
Source emptySource = Source.empty();
emptySource.to(receiveSink).run(mat);

}, mat);

​


Client code : Reads a file, prints it line by and sends it over the socket. 
The connecting and sending part works as I can see the data received at a 
netcat server.

ActorSystem system = ActorSystem.create("client");
ActorMaterializer mat = ActorMaterializer.create(system);

Flow> 
serverConnection = Tcp
.get(system).outgoingConnection("127.0.0.1", 6000);
Path file = Paths.get("C:\\temp\\Generic.csv");
CompletionStage cs = FileIO.fromPath(file)

.via(Framing.delimiter(ByteString.fromString("\r\n"), 10))
.map(str -> {
System.out.println(str.utf8String());
return str.concat(ByteString.fromString("\r\n"));
})

.via(serverConnection).to(akka.stream.javadsl.Sink.ignore())
.run(mat);

​
-chhil

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