All Downloads are FREE. Search and download functionalities are using the official Maven repository.

akka.routing.Random.scala Maven / Gradle / Ivy

The newest version!
/**
 * Copyright (C) 2009-2016 Lightbend Inc. 
 */
package akka.routing

import scala.collection.immutable
import java.util.concurrent.ThreadLocalRandom
import akka.dispatch.Dispatchers
import com.typesafe.config.Config
import akka.actor.SupervisorStrategy
import akka.japi.Util.immutableSeq
import akka.actor.ActorSystem

object RandomRoutingLogic {
  def apply(): RandomRoutingLogic = new RandomRoutingLogic
}

/**
 * Randomly selects one of the target routees to send a message to
 */
@SerialVersionUID(1L)
final class RandomRoutingLogic extends RoutingLogic {
  override def select(message: Any, routees: immutable.IndexedSeq[Routee]): Routee =
    if (routees.isEmpty) NoRoutee
    else routees(ThreadLocalRandom.current.nextInt(routees.size))
}

/**
 * A router pool that randomly selects one of the target routees to send a message to.
 *
 * The configuration parameter trumps the constructor arguments. This means that
 * if you provide `nrOfInstances` during instantiation they will be ignored if
 * the router is defined in the configuration file for the actor being used.
 *
 * 

Supervision Setup

* * Any routees that are created by a router will be created as the router's children. * The router is therefore also the children's supervisor. * * The supervision strategy of the router actor can be configured with * [[#withSupervisorStrategy]]. If no strategy is provided, routers default to * a strategy of “always escalate”. This means that errors are passed up to the * router's supervisor for handling. * * The router's supervisor will treat the error as an error with the router itself. * Therefore a directive to stop or restart will cause the router itself to stop or * restart. The router, in turn, will cause its children to stop and restart. * * @param nrOfInstances initial number of routees in the pool * * @param resizer optional resizer that dynamically adjust the pool size * * @param supervisorStrategy strategy for supervising the routees, see 'Supervision Setup' * * @param routerDispatcher dispatcher to use for the router head actor, which handles * supervision, death watch and router management messages */ @SerialVersionUID(1L) final case class RandomPool( override val nrOfInstances: Int, override val resizer: Option[Resizer] = None, override val supervisorStrategy: SupervisorStrategy = Pool.defaultSupervisorStrategy, override val routerDispatcher: String = Dispatchers.DefaultDispatcherId, override val usePoolDispatcher: Boolean = false) extends Pool with PoolOverrideUnsetConfig[RandomPool] { def this(config: Config) = this( nrOfInstances = config.getInt("nr-of-instances"), resizer = Resizer.fromConfig(config), usePoolDispatcher = config.hasPath("pool-dispatcher")) /** * Java API * @param nr initial number of routees in the pool */ def this(nr: Int) = this(nrOfInstances = nr) override def createRouter(system: ActorSystem): Router = new Router(RandomRoutingLogic()) override def nrOfInstances(sys: ActorSystem) = this.nrOfInstances /** * Setting the supervisor strategy to be used for the “head” Router actor. */ def withSupervisorStrategy(strategy: SupervisorStrategy): RandomPool = copy(supervisorStrategy = strategy) /** * Setting the resizer to be used. */ def withResizer(resizer: Resizer): RandomPool = copy(resizer = Some(resizer)) /** * Setting the dispatcher to be used for the router head actor, which handles * supervision, death watch and router management messages. */ def withDispatcher(dispatcherId: String): RandomPool = copy(routerDispatcher = dispatcherId) /** * Uses the resizer and/or the supervisor strategy of the given RouterConfig * if this RouterConfig doesn't have one, i.e. the resizer defined in code is used if * resizer was not defined in config. */ override def withFallback(other: RouterConfig): RouterConfig = this.overrideUnsetConfig(other) } /** * A router group that randomly selects one of the target routees to send a message to. * * The configuration parameter trumps the constructor arguments. This means that * if you provide `paths` during instantiation they will be ignored if * the router is defined in the configuration file for the actor being used. * * @param paths string representation of the actor paths of the routees, messages are * sent with [[akka.actor.ActorSelection]] to these paths * * @param routerDispatcher dispatcher to use for the router head actor, which handles * router management messages */ @SerialVersionUID(1L) final case class RandomGroup( override val paths: immutable.Iterable[String], override val routerDispatcher: String = Dispatchers.DefaultDispatcherId) extends Group { def this(config: Config) = this(paths = immutableSeq(config.getStringList("routees.paths"))) /** * Java API * @param routeePaths string representation of the actor paths of the routees, messages are * sent with [[akka.actor.ActorSelection]] to these paths */ def this(routeePaths: java.lang.Iterable[String]) = this(paths = immutableSeq(routeePaths)) override def paths(system: ActorSystem): immutable.Iterable[String] = this.paths override def createRouter(system: ActorSystem): Router = new Router(RandomRoutingLogic()) /** * Setting the dispatcher to be used for the router head actor, which handles * router management messages */ def withDispatcher(dispatcherId: String): RandomGroup = copy(routerDispatcher = dispatcherId) }




© 2015 - 2024 Weber Informatics LLC | Privacy Policy