Вот код:Почему этот настойчивый актер не работает
import akka.persistence._
import akka.actor.{Actor, ActorRef, ActorSystem, Props, ActorLogging}
class Counter extends PersistentActor with ActorLogging {
import Counter._
var state: State = new State(0)
override def receiveRecover: Receive = {
case RecoveryCompleted => println("Recovery completed.")
case SnapshotOffer(_, snapshot: State) => state = snapshot
case op: Operation => updateState(op)
}
override def persistenceId: String = "counter-persistent"
override def receiveCommand: Receive = {
case op: Operation =>
println(s"Counter receive ${op}")
persist(op) {
op => updateState(op)
}
case "print" => println(s"The current state of couter is ${state}")
case SaveSnapshotFailure(_, reason) => println(s"save snapshot failed, reason: ${reason}")
case SaveSnapshotSuccess(_) => println(s"snapshot saved")
}
def updateState(op: Operation): Unit = op match {
case Increment(n) =>
state = state.inc(n)
takeSnapshot
case Decrement(n) =>
state = state.dec(n)
takeSnapshot
}
def takeSnapshot: Unit = {
// if (state % 5 == 0) saveSnapshot()
saveSnapshot()
}
}
object Counter {
sealed trait Operation {
val count: Int
}
case class Increment(override val count: Int) extends Operation
case class Decrement(override val count: Int) extends Operation
final case class State(n: Int) {
def inc(x: Int) = State(n + x)
def dec(x: Int) = State(n - x)
}
}
object Persistent extends App {
import Counter._
val system = ActorSystem("persistent-actors")
val counter = system.actorOf(Props[Counter])
counter ! Increment(3)
counter ! Increment(5)
counter ! Decrement(3)
counter ! "print"
Thread.sleep(1000)
system.terminate()
}
Configuration (application.conf):
akka {
persistence {
journal {
plugin = "akka.persistence.journal.leveldb",
leveldb {
dir = "target/example/journal",
native = false
}
},
snapshot-store {
plugin = "akka.persistence.snapshot-store.local",
local {
dir = "target/example/snapshots"
}
}
}
}
Запуск приложения дважды показывает, что состояние не является постоянным на всех:
Recovery completed.
Counter receive Increment(3)
Counter receive Increment(5)
Counter receive Decrement(3)
The current state of couter is State(5)
snapshot saved
snapshot saved
snapshot saved
Recovery completed.
Counter receive Increment(3)
Counter receive Increment(5)
Counter receive Decrement(3)
The current state of couter is State(5)
snapshot saved
snapshot saved
snapshot saved
Почему?
Вы настроили плагин persistence? Какой журнал вы используете? – manub
В чем проблема, с которой вы сталкиваетесь, что не работает. Пожалуйста, предоставьте дополнительную информацию об этом. – curious
Конфигурация @manub теперь отправлена. – qed