Getting an Overview of Actors in an Akka System
Getting an Overview of Actors in an Akka System
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I've been playing around with akka-http and akka-streams lately and was wondering which kinds of actors were created when I create flow graphs and process http requests. I ran into the typesafe console, but that is already end of live (https://groups.google.com/forum/#!forum/typesafe-console) and doesn't support the newer versions of akka.
So after some looking around I ran into a post on stackoverflow providing an alternative approach (http://stackoverflow.com/questions/25860939/how-print-all-actors-in-akka...):
This posts lists some pseudo code, which pointed me in pretty much the right direction. I currently use the following actor to print out all the actors in the system:
class IDActor extends Actor with ActorLogging {
def receive = {
case "start" =>
log.info("Current Actors in system:")
self ! ActorPath.fromString("akka://Streams/user/")
case path: ActorPath =>
context.actorSelection(path / "*") ! Identify(())
case ActorIdentity(_, Some(ref)) =>
log.info(ref.toString())
self ! ref.path
}
}
To start this all we have to do is get the actor and message "start":
The result is very interesting. For instance in a http-akka system with a couple of flows running I get the following overview of actors:
Current Actors in system: Actor[akka://Streams/user/$a/flow-1-2-1-foreach-stageFactory#-1147809628] Actor[akka://Streams/user/$a/flow-1-2-1-foreach-stageFactory#-1147809628] Actor[akka://Streams/user/$a/flow-1-2-1-foreach-stageFactory#-1147809628] Actor[akka://Streams/user/$a/flow-1-2-1-foreach-stageFactory#-1147809628] Actor[akka://Streams/user/$a/flow-1-2-1-foreach-stageFactory#-1147809628] Actor[akka://Streams/user/$a#-992619289] Actor[akka://Streams/user/idActor#830993582] Actor[akka://Streams/user/$a/flow-1-1-map#310662784] ... Actor[akka://Streams/user/$a/flow-751-1-prefixAndTail#801612770] Actor[akka://Streams/user/$a/flow-752-1-prefixAndTail#-1939947471] Actor[akka://Streams/user/$a/flow-753-1-prefixAndTail#102076528] Actor[akka://Streams/user/$a/flow-754-1-prefixAndTail#-1858318406] Actor[akka://Streams/user/$a/flow-755-1-prefixAndTail#595550267] Actor[akka://Streams/user/$a/flow-756-1-prefixAndTail#-1675014490] Actor[akka://Streams/user/$a/flow-76-1-map#-1734873421] Actor[akka://Streams/user/$a/flow-93-1-map#174954170] Actor[akka://Streams/user/$a/flow-726-1-mapAsync#2041440238] Actor[akka://Streams/user/$a/flow-725-1-mapAsync#-674218071] Actor[akka://Streams/user/$a/flow-745-1-mapAsync#-800760294]
Cool right. Not that you can do much with it, but it at least gives you a good overview of what is happening internally.
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