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 serverset2
    Definition Classes
    finagle
  • package addr
    Definition Classes
    serverset2
  • package client
    Definition Classes
    serverset2
  • package naming
    Definition Classes
    serverset2
  • Endpoint
  • Entry
  • Identity
  • RetryStream
  • UserIdentity
  • Zk2Resolver
  • chatty
  • dnsCacheSize

trait Identity extends AnyRef

An Identity provides identifying metadata for a process. Identifiers provide a uniform method of accessing identifying data for processes running in different environments.

They are identified by a scheme and id. The scheme provides the name of the Identifier, and provides a context for id. The id will be None if the Identifier cannot resolve information for the process, or Some[String] if information is available.

Identities have an associated priority, to allow for ordering when enumerating multiple Identities.

These are loaded by Finagle through the service loading mechanism. Thus, in order to implement a new Identity, a class implementing Identity with a 0-arg constructor must be registered in a file named META-INF/services/com.twitter.finagle.serverset2.Identity included in the classpath; see Oracle's ServiceLoader documentation for further details.

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  1. abstract val id: Option[String]
  2. abstract val priority: Int
  3. abstract val scheme: String

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