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Restart(Source|Flow|Sink): Configurable stream restart deadline (#29591)

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r-glyde 2020-10-05 08:12:15 +01:00 • committed by GitHub
parent 4cc3c58a08
commit a4acf23d05
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22 changed files with 727 additions and 347 deletions
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11
akka-docs/src/test/scala/docs/stream/RestartDocSpec.scala
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@ -5,7 +5,7 @@
package docs.stream
import akka.NotUsed
import akka.stream.KillSwitches
import akka.stream.{ KillSwitches, RestartSettings }
import akka.stream.scaladsl._
import akka.testkit.AkkaSpec
import docs.CompileOnlySpec
@ -34,12 +34,13 @@ class RestartDocSpec extends AkkaSpec with CompileOnlySpec {
"demonstrate a restart with backoff source" in compileOnlySpec {
//#restart-with-backoff-source
val restartSource = RestartSource.withBackoff(
val settings = RestartSettings(
minBackoff = 3.seconds,
maxBackoff = 30.seconds,
randomFactor = 0.2, // adds 20% "noise" to vary the intervals slightly
maxRestarts = 20 // limits the amount of restarts to 20
) { () =>
randomFactor = 0.2 // adds 20% "noise" to vary the intervals slightly
).withMaxRestarts(20, 5.minutes) // limits the amount of restarts to 20 within 5 minutes
val restartSource = RestartSource.withBackoff(settings) { () =>
// Create a source from a future of a source
Source.futureSource {
// Make a single request with akka-http

10
akka-docs/src/test/scala/docs/stream/operators/source/Restart.scala
View file

@ -6,8 +6,7 @@ package docs.stream.operators.source
import akka.NotUsed
import akka.actor.ActorSystem
import akka.stream.KillSwitches
import akka.stream.UniqueKillSwitch
import akka.stream.{ KillSwitches, RestartSettings, UniqueKillSwitch }
import akka.stream.scaladsl.Keep
import akka.stream.scaladsl.RestartSource
import akka.stream.scaladsl.Sink
@ -31,7 +30,8 @@ object Restart extends App {
val flakySource: Source[() => Int, NotUsed] =
Source(List(() => 1, () => 2, () => 3, () => throw CantConnectToDatabase("darn")))
val forever =
RestartSource.onFailuresWithBackoff(minBackoff = 1.second, maxBackoff = 10.seconds, 0.1)(() => flakySource)
RestartSource.onFailuresWithBackoff(
RestartSettings(minBackoff = 1.second, maxBackoff = 10.seconds, randomFactor = 0.1))(() => flakySource)
forever.runWith(Sink.foreach(nr => system.log.info("{}", nr())))
// logs
//[INFO] [12/10/2019 13:51:58.300] [default-akka.test.stream-dispatcher-7] [akka.actor.ActorSystemImpl(default)] 1
@ -56,7 +56,7 @@ object Restart extends App {
//#restart-failure-inner-complete
val finiteSource = Source.tick(1.second, 1.second, "tick").take(3)
val forever = RestartSource.onFailuresWithBackoff(1.second, 10.seconds, 0.1)(() => finiteSource)
val forever = RestartSource.onFailuresWithBackoff(RestartSettings(1.second, 10.seconds, 0.1))(() => finiteSource)
forever.runWith(Sink.foreach(println))
// prints
// tick
@ -71,7 +71,7 @@ object Restart extends App {
Source(List(() => 1, () => 2, () => 3, () => throw CantConnectToDatabase("darn")))
val stopRestarting: UniqueKillSwitch =
RestartSource
.onFailuresWithBackoff(1.second, 10.seconds, 0.1)(() => flakySource)
.onFailuresWithBackoff(RestartSettings(1.second, 10.seconds, 0.1))(() => flakySource)
.viaMat(KillSwitches.single)(Keep.right)
.toMat(Sink.foreach(nr => println(s"Nr ${nr()}")))(Keep.left)
.run()