Packages

  • package root
    Definition Classes
    root
  • package com
    Definition Classes
    root
  • package twitter

    Start with com.twitter.finagle.

    Definition Classes
    com
  • package finagle

    Finagle is an extensible RPC system.

    Finagle is an extensible RPC system.

    Services are represented by class com.twitter.finagle.Service. Clients make use of com.twitter.finagle.Service objects while servers implement them.

    Finagle contains a number of protocol implementations; each of these implement Client and/or com.twitter.finagle.Server. For example, Finagle's HTTP implementation, com.twitter.finagle.Http (in package finagle-http), exposes both.

    Thus a simple HTTP server is built like this:

    import com.twitter.finagle.{Http, Service}
    import com.twitter.finagle.http.{Request, Response}
    import com.twitter.util.{Await, Future}
    
    val service = new Service[Request, Response] {
      def apply(req: Request): Future[Response] =
        Future.value(Response())
    }
    val server = Http.server.serve(":8080", service)
    Await.ready(server)

    We first define a service to which requests are dispatched. In this case, the service returns immediately with a HTTP 200 OK response, and with no content.

    This service is then served via the Http protocol on TCP port 8080. Finally we wait for the server to stop serving.

    We can now query our web server:

    % curl -D - localhost:8080
    HTTP/1.1 200 OK

    Building an HTTP client is also simple. (Note that type annotations are added for illustration.)

    import com.twitter.finagle.{Http, Service}
    import com.twitter.finagle.http.{Request, Response}
    import com.twitter.util.{Future, Return, Throw}
    
    val client: Service[Request, Response] = Http.client.newService("localhost:8080")
    val f: Future[Response] = client(Request()).respond {
      case Return(rep) =>
        printf("Got HTTP response %s\n", rep)
      case Throw(exc) =>
        printf("Got error %s\n", exc)
    }

    Http.client.newService("localhost:8080") constructs a new com.twitter.finagle.Service instance connected to localhost TCP port 8080. We then issue a HTTP/1.1 GET request to URI "/". The service returns a com.twitter.util.Future representing the result of the operation. We listen to this future, printing an appropriate message when the response arrives.

    The Finagle homepage contains useful documentation and resources for using Finagle.

    Definition Classes
    twitter
  • package loadbalancer

    This package implements client side load balancing algorithms.

    This package implements client side load balancing algorithms.

    As an end-user, see the Balancers API to create instances which can be used to configure a Finagle client with various load balancing strategies.

    As an implementor, each algorithm gets its own subdirectory and is exposed via the Balancers object. Several convenient traits are provided which factor out common behavior and can be mixed in (i.e. Balancer, DistributorT, NodeT, and Updating).

    Definition Classes
    finagle
  • package aperture
    Definition Classes
    loadbalancer
  • package distributor
    Definition Classes
    loadbalancer
  • package exp
    Definition Classes
    loadbalancer
  • BalancerRegistry
  • Balancers
  • EndpointFactory
  • FlagBalancerFactory
  • LoadBalancerFactory
  • Metadata
  • defaultBalancer
  • perHostStats

abstract class LoadBalancerFactory extends AnyRef

A thin interface around a Balancer's constructor that allows Finagle to pass in context from the stack to the balancers at construction time.

See also

Balancers for a collection of available balancers.

The user guide for more details.

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Instance Constructors

  1. new LoadBalancerFactory()

Abstract Value Members

  1. abstract def newBalancer[Req, Rep](endpoints: Activity[IndexedSeq[EndpointFactory[Req, Rep]]], emptyException: NoBrokersAvailableException, params: Params): ServiceFactory[Req, Rep]

    Returns a new balancer which is represented by a com.twitter.finagle.ServiceFactory.

    Returns a new balancer which is represented by a com.twitter.finagle.ServiceFactory.

    endpoints

    The load balancer's collection is usually populated concurrently. So the interface to build a balancer is wrapped in an com.twitter.util.Activity which allows us to observe this process for changes.

    emptyException

    The exception returned when a balancer's collection is empty.

    params

    A collection of parameters usually passed in from the client stack.

    Note

    endpoints are ordered by the LoadBalancerFactory.AddressOrdering param.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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    Definition Classes
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  15. def supportsEagerConnections: Boolean
    Attributes
    protected[twitter]
  16. def supportsWeighted: Boolean
    Attributes
    protected[twitter]
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    Definition Classes
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