c

akka.routing

TailChoppingPool

final case class TailChoppingPool(nrOfInstances: Int, resizer: Option[Resizer] = None, within: FiniteDuration, interval: FiniteDuration, supervisorStrategy: SupervisorStrategy = Pool.defaultSupervisorStrategy, routerDispatcher: String = Dispatchers.DefaultDispatcherId, usePoolDispatcher: Boolean = false) extends Pool with PoolOverrideUnsetConfig[TailChoppingPool] with Product with Serializable

A router pool with retry logic, intended for cases where a return message is expected in response to a message sent to the routee. As each message is sent to the routing pool, the routees are randomly ordered. The message is sent to the first routee. If no response is received before the interval has passed, the same message is sent to the next routee. This process repeats until either a response is received from some routee, the routees in the pool are exhausted, or the within duration has passed since the first send. If no routee sends a response in time, a akka.actor.Status.Failure wrapping a akka.pattern.AskTimeoutException is sent to the sender.

Refer to akka.routing.TailChoppingRoutingLogic for comments regarding the goal of this routing algorithm.

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.

nrOfInstances

initial number of routees in the pool

resizer

optional resizer that dynamically adjust the pool size

within

expecting at least one reply within this duration, otherwise it will reply with akka.pattern.AskTimeoutException in a akka.actor.Status.Failure

interval

duration after which the message will be sent to the next routee

supervisorStrategy

strategy for supervising the routees, see 'Supervision Setup'

routerDispatcher

dispatcher to use for the router head actor, which handles supervision, death watch and router management messages

Annotations
@SerialVersionUID()
Source
TailChopping.scala
Linear Supertypes
Product, Equals, PoolOverrideUnsetConfig[TailChoppingPool], Pool, RouterConfig, Serializable, Serializable, AnyRef, Any
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  1. TailChoppingPool
  2. Product
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  4. PoolOverrideUnsetConfig
  5. Pool
  6. RouterConfig
  7. Serializable
  8. Serializable
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Instance Constructors

  1. new TailChoppingPool(nr: Int, within: Duration, interval: Duration)

    Java API

    Java API

    nr

    initial number of routees in the pool

    within

    expecting at least one reply within this duration, otherwise it will reply with akka.pattern.AskTimeoutException in a akka.actor.Status.Failure

    interval

    duration after which next routee will be picked

  2. new TailChoppingPool(nr: Int, within: FiniteDuration, interval: FiniteDuration)

    Java API

    Java API

    nr

    initial number of routees in the pool

    within

    expecting at least one reply within this duration, otherwise it will reply with akka.pattern.AskTimeoutException in a akka.actor.Status.Failure

    interval

    duration after which next routee will be picked

  3. new TailChoppingPool(config: Config)
  4. new TailChoppingPool(nrOfInstances: Int, resizer: Option[Resizer] = None, within: FiniteDuration, interval: FiniteDuration, supervisorStrategy: SupervisorStrategy = Pool.defaultSupervisorStrategy, routerDispatcher: String = Dispatchers.DefaultDispatcherId, usePoolDispatcher: Boolean = false)

    nrOfInstances

    initial number of routees in the pool

    resizer

    optional resizer that dynamically adjust the pool size

    within

    expecting at least one reply within this duration, otherwise it will reply with akka.pattern.AskTimeoutException in a akka.actor.Status.Failure

    interval

    duration after which the message will be sent to the next routee

    supervisorStrategy

    strategy for supervising the routees, see 'Supervision Setup'

    routerDispatcher

    dispatcher to use for the router head actor, which handles supervision, death watch and router management messages

Value Members

  1. def createRouter(system: ActorSystem): Router

    Create the actual router, responsible for routing messages to routees.

    Create the actual router, responsible for routing messages to routees.

    system

    the ActorSystem this router belongs to

    Definition Classes
    TailChoppingPool → RouterConfig
  2. val interval: FiniteDuration
  3. def isManagementMessage(msg: Any): Boolean

    Is the message handled by the router head actor or the #routingLogicController actor.

    Is the message handled by the router head actor or the #routingLogicController actor.

    Definition Classes
    RouterConfig
  4. def nrOfInstances(sys: ActorSystem): Int
    Definition Classes
    TailChoppingPool → Pool
  5. val nrOfInstances: Int
  6. final def overrideUnsetConfig(other: RouterConfig): RouterConfig
    Definition Classes
    PoolOverrideUnsetConfig
  7. def props(routeeProps: Props): Props

    akka.actor.Props for a pool router based on the settings defined by this instance and the supplied akka.actor.Props for the routees created by the router.

    akka.actor.Props for a pool router based on the settings defined by this instance and the supplied akka.actor.Props for the routees created by the router.

    Definition Classes
    Pool
  8. val resizer: Option[Resizer]

    Pool with dynamically resizable number of routees return the akka.routing.Resizer to use.

    Pool with dynamically resizable number of routees return the akka.routing.Resizer to use. The resizer is invoked once when the router is created, before any messages can be sent to it. Resize is also triggered when messages are sent to the routees, and the resizer is invoked asynchronously, i.e. not necessarily before the message has been sent.

    Definition Classes
    TailChoppingPool → Pool
  9. val routerDispatcher: String

    Dispatcher ID to use for running the “head” actor, which handles supervision, death watch and router management messages

    Dispatcher ID to use for running the “head” actor, which handles supervision, death watch and router management messages

    Definition Classes
    TailChoppingPool → RouterConfig
  10. def routingLogicController(routingLogic: RoutingLogic): Option[Props]

    Possibility to define an actor for controlling the routing logic from external stimuli (e.g.

    Possibility to define an actor for controlling the routing logic from external stimuli (e.g. monitoring metrics). This actor will be a child of the router "head" actor. Management messages not handled by the "head" actor are delegated to this controller actor.

    Definition Classes
    RouterConfig
  11. def stopRouterWhenAllRouteesRemoved: Boolean
    Definition Classes
    Pool → RouterConfig
  12. val supervisorStrategy: SupervisorStrategy

    SupervisorStrategy for the head actor, i.e.

    SupervisorStrategy for the head actor, i.e. for supervising the routees of the pool.

    Definition Classes
    TailChoppingPool → Pool
  13. val usePoolDispatcher: Boolean

    Use a dedicated dispatcher for the routees of the pool.

    Use a dedicated dispatcher for the routees of the pool. The dispatcher is defined in 'pool-dispatcher' configuration property in the deployment section of the router.

    Definition Classes
    TailChoppingPool → Pool
  14. def verifyConfig(path: ActorPath): Unit

    Check that everything is there which is needed.

    Check that everything is there which is needed. Called in constructor of RoutedActorRef to fail early.

    Definition Classes
    RouterConfig
  15. def withDispatcher(dispatcherId: String): TailChoppingPool

    Setting the dispatcher to be used for the router head actor, which handles supervision, death watch and router management messages.

  16. def withFallback(other: RouterConfig): RouterConfig

    Uses the resizer and/or the supervisor strategy of the given RouterConfig if this RouterConfig doesn't have one, i.e.

    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.

    Definition Classes
    TailChoppingPool → RouterConfig
  17. def withResizer(resizer: Resizer): TailChoppingPool

    Setting the resizer to be used.

    Setting the resizer to be used.

    Definition Classes
    TailChoppingPool → PoolOverrideUnsetConfig
  18. def withSupervisorStrategy(strategy: SupervisorStrategy): TailChoppingPool

    Setting the supervisor strategy to be used for the “head” Router actor.

    Setting the supervisor strategy to be used for the “head” Router actor.

    Definition Classes
    TailChoppingPool → PoolOverrideUnsetConfig
  19. val within: FiniteDuration