72 lines
2 KiB
Scala
72 lines
2 KiB
Scala
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/**
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* Copyright (C) 2009-2013 Typesafe Inc. <http://www.typesafe.com>
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*/
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package sample.persistence
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import akka.actor._
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import akka.persistence._
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object ViewExample extends App {
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class ExampleProcessor extends Processor {
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override def processorId = "processor-5"
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def receive = {
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case Persistent(payload, sequenceNr) =>
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println(s"processor received ${payload} (sequence nr = ${sequenceNr})")
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}
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}
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class ExampleView extends View {
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private var numReplicated = 0
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override def processorId = "processor-5"
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override def viewId = "view-5"
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private val destination = context.actorOf(Props[ExampleDestination])
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private val channel = context.actorOf(Channel.props("channel"))
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def receive = {
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case "snap" =>
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saveSnapshot(numReplicated)
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case SnapshotOffer(metadata, snapshot: Int) =>
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numReplicated = snapshot
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println(s"view received snapshot offer ${snapshot} (metadata = ${metadata})")
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case Persistent(payload, sequenceNr) =>
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numReplicated += 1
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println(s"view received ${payload} (sequence nr = ${sequenceNr}, num replicated = ${numReplicated})")
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channel ! Deliver(Persistent(s"replicated-${payload}"), destination.path)
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}
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}
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class ExampleDestination extends Actor {
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def receive = {
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case cp @ ConfirmablePersistent(payload, sequenceNr, _) =>
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println(s"destination received ${payload} (sequence nr = ${sequenceNr})")
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cp.confirm()
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}
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}
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val system = ActorSystem("example")
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val processor = system.actorOf(Props(classOf[ExampleProcessor]))
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val view = system.actorOf(Props(classOf[ExampleView]))
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@annotation.tailrec
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def read(line: String): Unit = line match {
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case "exit" | null =>
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case "sync" =>
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view ! Update(await = false)
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read(Console.readLine())
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case "snap" =>
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view ! "snap"
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read(Console.readLine())
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case msg =>
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processor ! Persistent(msg)
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read(Console.readLine())
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}
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read(Console.readLine())
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system.shutdown()
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}
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