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refactor: Extract common code from responders into EntityAndClassIriS… (
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54 changes: 54 additions & 0 deletions
54
webapi/src/main/scala/org/knora/webapi/responders/ActorDeps.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /* | ||
| * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors. | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
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| package org.knora.webapi.responders | ||
| import akka.actor.ActorRef | ||
| import akka.actor.ActorSystem | ||
| import akka.util.Timeout | ||
| import zio.ZIO | ||
| import zio.ZLayer | ||
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| import scala.concurrent.ExecutionContext | ||
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| import org.knora.webapi.config.AppConfig | ||
| import org.knora.webapi.core.AppRouter | ||
| import org.knora.webapi.settings.KnoraDispatchers | ||
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| /** | ||
| * Class encapsulating all Akka dependencies necessary to interact with the [[org.knora.webapi.core.actors.RoutingActor]] aka. "appActor" | ||
| * | ||
| * When using this class in a service depending on the routing actor this will provide the necessary implicit dependencies for using the ask pattern | ||
| * whilst making the dependency explicit for ZIO layers. | ||
| * | ||
| * @example Usage in client code: | ||
| * {{{ | ||
| * final case class YourService(actorDeps: ActorDeps){ | ||
| * private implicit val ec: ExecutionContext = actorDeps.executionContext | ||
| * private implicit val timeout: Timeout = actorDeps.timeout | ||
| * | ||
| * private val appActor: ActorRef = actorDeps.appActor | ||
| * | ||
| * def someMethod = appActor.ask(SomeMessage())... | ||
| * } | ||
| * }}} | ||
| * | ||
| * @param system the akka.core.ActorSystem - used to extract the [[ExecutionContext]] from | ||
| * @param appActor a reference to the [[org.knora.webapi.core.actors.RoutingActor]] | ||
| * @param timeout the timeout needed for the ask pattern | ||
| */ | ||
| final case class ActorDeps(system: ActorSystem, appActor: ActorRef, timeout: Timeout) { | ||
| val executionContext: ExecutionContext = system.dispatchers.lookup(KnoraDispatchers.KnoraActorDispatcher) | ||
| } | ||
|
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| object ActorDeps { | ||
| val layer: ZLayer[AppConfig with AppRouter, Nothing, ActorDeps] = ZLayer.fromZIO { | ||
| for { | ||
| router <- ZIO.service[AppRouter] | ||
| system = router.system | ||
| appActor = router.ref | ||
| timeout <- ZIO.service[AppConfig].map(_.defaultTimeoutAsDuration) | ||
| } yield ActorDeps(system, appActor, timeout) | ||
| } | ||
| } |
47 changes: 47 additions & 0 deletions
47
webapi/src/main/scala/org/knora/webapi/responders/ActorToZioBridge.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,47 @@ | ||
| package org.knora.webapi.responders | ||
| import akka.actor.Actor | ||
| import akka.actor.ActorRef | ||
| import akka.pattern.ask | ||
| import akka.util.Timeout | ||
| import zio.Tag | ||
| import zio.Task | ||
| import zio.URLayer | ||
| import zio.ZIO | ||
| import zio.ZLayer | ||
|
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| import scala.reflect.ClassTag | ||
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| import org.knora.webapi.messages.ResponderRequest | ||
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| /** | ||
| * This trait encapsulates the [[akka.pattern.ask]] into the zio world | ||
| */ | ||
| trait ActorToZioBridge { | ||
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| /** | ||
| * Sends a message to the "appActor" [[org.knora.webapi.core.actors.RoutingActor]] using the [[akka.pattern.ask]], | ||
| * casts and returns the response to the expected return type `R` as [[Task]]. | ||
| * | ||
| * @param message The message sent to the actor | ||
| * @param tag implicit proof that the result type `R` has a [[ClassTag]] | ||
| * | ||
| * @tparam R The type of the expected success value | ||
| * @return A Task containing either the success `R` or the failure [[Throwable]], | ||
| * will fail during runtime with a [[ClassCastException]] if the `R` does not correspond | ||
| * to the response of the message being sent due to the untyped nature of the ask pattern | ||
| */ | ||
| def askAppActor[R: Tag](message: ResponderRequest)(implicit tag: ClassTag[R]): Task[R] | ||
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| } | ||
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| final case class ActorToZioBridgeLive(actorDeps: ActorDeps) extends ActorToZioBridge { | ||
| private implicit val timeout: Timeout = actorDeps.timeout | ||
| private val appActor: ActorRef = actorDeps.appActor | ||
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| override def askAppActor[R: Tag](message: ResponderRequest)(implicit tag: ClassTag[R]): Task[R] = | ||
| ZIO.fromFuture(_ => appActor.ask(message, Actor.noSender).mapTo[R]) | ||
| } | ||
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| object ActorToZioBridge { | ||
| val live: URLayer[ActorDeps, ActorToZioBridgeLive] = ZLayer.fromFunction(ActorToZioBridgeLive.apply _) | ||
| } |
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