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

    Start with com.twitter.finagle.

    Definition Classes
  • 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] =
    val server = Http.server.serve(":8080", service)

    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
  • package serverset2
    Definition Classes
  • package client
    Definition Classes
  • NullZooKeeperClient
  • NullZooKeeperMulti
  • NullZooKeeperRW
  • NullZooKeeperRWMulti
  • NullZooKeeperReader
  • NullZooKeeperWriter
  • SessionStats
  • StateTracker
  • ZooKeeperReader
  • package naming
    Definition Classes

package client

  1. Alphabetic
  1. Public
  2. Protected

Type Members

  1. trait NullZooKeeperClient extends ZooKeeperClient

    Provide a Null client, useful as an initial value for a wrapper that re-establishes a ZooKeeper connection on SessionExpiration, as ZooKeeperClient is designed for single session operation.

  2. trait NullZooKeeperMulti extends ZooKeeperMulti with NullZooKeeperClient
  3. trait NullZooKeeperRW extends ZooKeeperRW with NullZooKeeperReader with NullZooKeeperWriter
  4. trait NullZooKeeperRWMulti extends ZooKeeperRWMulti with NullZooKeeperReader with NullZooKeeperWriter with NullZooKeeperMulti
  5. trait NullZooKeeperReader extends ZooKeeperReader with NullZooKeeperClient
  6. trait NullZooKeeperWriter extends ZooKeeperWriter with NullZooKeeperClient
  7. class StateTracker extends Closable