actor

I would like to use Akka actors in Java. I downloaded the akka-1.0.zip and added akka-actor-1.0.jar to my "Build Path" in Eclipse. Then I wrote this Actor class: package com.example; import akka.actor.UntypedActor; public class MyActor extends UntypedActor { public void onReceive(Object message) throws IllegalArgumentException { if (message instanceof String) { System.out.println("Received: " + message); } else throw new IllegalArgumentException("Unknown message: " + message); } } But I get errors in Eclipse: The type scala.Option cannot be resolved. The type scala.Some cannot be resolved. The

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I'm getting null pointer exception on the field injection of a server which is started as an akka actor. Schedular part: private ActorRef myActor = Akka.system().actorOf( new Props(Retreiver.class)); @Override public void onStart(Application app) { log.info("Starting schedular.....!"); Akka.system() .scheduler() .schedule(Duration.create(0, TimeUnit.MILLISECONDS), Duration.create(30, TimeUnit.MINUTES), myActor, "tick", Akka.system().dispatcher()); } Retreiver class part: public class Retreiver extends UntypedActor { private Logger.ALogger log = Logger.of(Retreiver .class); @Inject private

Using Scala 2.8 RC1 or newer, what is the best (easiest and/or most direct) method to "peek" at the waiting messages in an actor's mailbox (from within the same actor's act() method) in order to examine what is in the queue, without having to react/receive the messages and/or disturb the current contents of the mailbox in any way. The purpose of this is so that an actor may determine if it is safe to process a request to exit by first determining if any of the remaining mailbox messages are ones that must be processed, instead of just dropped by stopping the actor immediately. You don't need

I've read here that is should be possible to host tightly coupled ActorTypes within the same service but I can't seem to find any documentation on exactly how to do it. I thought it might I need to create my own instance of the ActorService and pass the context into it but I don't seen to be able to find the right API's from the document. Does anyone have an example they could share ? Sort of but not really. You can have multiple actor types in the same application . It looks like they're in the same service in Visual Studio, but they're actually deployed as separate services. Bear with me for

I'm attempting to log to a file rather than stdout. My application.conf (in src/main/resources/): akka { event-handlers = ["akka.event.slf4j.Slf4jEventHandler"] loglevel = "DEBUG" } logback.xml (in src/main/resources/): <configuration> <appender name="FILE" class="ch.qos.logback.core.FileAppender"> <file>log/app.log</file> <append>true</append> <encoder> <pattern>%date{yyyy-MM-dd} %X{akkaTimestamp} %-5level[%thread] %logger{1} - %msg%n</pattern> </encoder> </appender> <root level="DEBUG"> <appender-ref ref="FILE"/> </root> </configuration> Creating the actor system: val conf: Config =

In Scala, if I have a simple class as follows: val calc = actor { var sum = 0 loop { react { case Add(n) => sum += n case RequestSum => sender ! sum } } } Should my field sum be marked @volatile ? Whilst the actor is logically single-threaded (i.e. the messages are processed sequentially), the individual reactions may be happening on separate threads and hence the state variable may be being altered on one thread and then read from another. You don't need to mark them as volatile. The execution of your code isn't inside a synchronized block, but the actor will always pass through one before