Getting an Overview of Actors in an Akka System
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Join For Freei'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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