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 zookeeper
    Definition Classes
    finagle
  • ZkAnnouncer
  • ZkAnnouncerException
  • ZkResolver
  • ZkResolverException

class ZkAnnouncer extends Announcer

When announcing an endpoint with additional endpoints they all need to join the path together. However, announcements are decoupled and can happen in any order. The ZkAnnouncer will gather endpoints together in order to announce them as a group. Main endpoints are required and are thus announced immediately while additional endpoints are only announced if the path also has a main endpoint. For this reason if a main endpoint is announced first and an additional endpoint announced later, the announcer must leave the path and re-announce. The process is similar: leave the path, then remove either the additional endpoint or the main endpoint, re-join only if the main endpoint exists.

Self Type
ZkAnnouncer
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Instance Constructors

  1. new ZkAnnouncer()
  2. new ZkAnnouncer(factory: ZkClientFactory)

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. def announce(ia: InetSocketAddress, addr: String): Future[Announcement]

    Requiring the shardId here is an unfortunate artifact of the implementation of ServerSets.

    Requiring the shardId here is an unfortunate artifact of the implementation of ServerSets. For most uses setting it to 0 is sufficient

    Definition Classes
    ZkAnnouncerAnnouncer
  5. def announce(client: ZooKeeperClient, path: String, shardId: Int, addr: InetSocketAddress, endpoint: Option[String]): Future[Announcement]
  6. def announce(hosts: String, path: String, shardId: Int, addr: InetSocketAddress, endpoint: Option[String]): Future[Announcement]
  7. final def asInstanceOf[T0]: T0
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  8. def clone(): AnyRef
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  11. def finalize(): Unit
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  12. final def getClass(): Class[_]
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  15. final def ne(arg0: AnyRef): Boolean
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  17. final def notifyAll(): Unit
    Definition Classes
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  18. val scheme: String
    Definition Classes
    ZkAnnouncerAnnouncer
  19. final def synchronized[T0](arg0: ⇒ T0): T0
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  20. def toString(): String
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  21. final def wait(): Unit
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    @throws( ... )
  22. final def wait(arg0: Long, arg1: Int): Unit
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  23. final def wait(arg0: Long): Unit
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Inherited from Announcer

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