Cannot configure Bounded Mailbox for Routees of RoundRobinPool - scala

Question

When I try to set bounded-mailbox for routees of a pool (RoundRobinPool) in configuration file, somehow Akka ignores the mailbox configuration.
Here is the configuration I use:
bounded-mailbox {
mailbox-type = "akka.dispatch.BoundedMailbox"
mailbox-capacity = 1
mailbox-push-timeout-time = 1s
}
akka.actor.deployment {
/singletestactor {
mailbox = bounded-mailbox
}
/groupedtestactor {
mailbox = bounded-mailbox
router = round-robin-pool
nr-of-instances = 5
}
}
And here is the test code:
object MailboxTest {
def main(args: Array[String]): Unit = {
val actorSystem = ActorSystem()
val singleTestActor = actorSystem.actorOf(Props[TestActor], "singletestactor")
for (i <- 1 to 10) {
singleTestActor ! Hello(i)
}
val groupedTestActor = actorSystem.actorOf(Props[TestActor].withRouter(FromConfig, "groupedtestactor")
for (i <- 1 to 1000) {
groupedTestActor ! Hello(i)
}
}
}
class TestActor extends Actor {
def receive = {
case Hello(i) => {
println(s"Hello($i) - begin!")
Thread.sleep(10000)
println(s"Hello($i) - end!")
}
}
}
case class Hello(i: Int)
Am I doing something wrong, or there is no way to define mailbox for routees?

Answer 1

You need to add mailbox.requirements configuration in application.conf;
akka.actor.mailbox.requirements {
"akka.dispatch.BoundedMessageQueueSemantics" = bounded-mailbox
}
Then need to extend TestActor like this;
class TestActor extends Actor with RequiresMessageQueue[BoundedMessageQueueSemantics]
See the documentation here for mailbox configuration.
I also created round robin pool like this;
val groupedTestActor = actorSystem.actorOf(FromConfig.props(Props[TestActor]), "groupedtestactor")