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 liveness
    Definition Classes
    finagle
  • FailureAccrualFactory
  • FailureAccrualPolicy
  • FailureDetector
  • FailureDetectors
  • sessionFailureDetector

object FailureAccrualPolicy

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  6. def consecutiveFailures(numFailures: Int, markDeadFor: Stream[Duration]): FailureAccrualPolicy

    A policy based on a maximum number of consecutive failures.

    A policy based on a maximum number of consecutive failures. If numFailures occur consecutively, checkFailures() will return a Some(Duration) to mark an endpoint dead for.

    numFailures

    number of consecutive failures

    markDeadFor

    stream of durations to use for the next duration returned from markDeadOnFailure()

  7. val constantBackoff: Stream[Duration]
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  17. def successRate(requiredSuccessRate: Double, window: Int, markDeadFor: Stream[Duration]): FailureAccrualPolicy

    Returns a policy based on an exponentially-weighted moving average success rate over a window of requests.

    Returns a policy based on an exponentially-weighted moving average success rate over a window of requests. A moving average is used so the success rate calculation is biased towards more recent requests; for an endpoint with low traffic, the window will span a longer time period and early successes and failures may not accurately reflect the current health.

    If the computed weighted success rate is less than the required success rate, markDeadOnFailure() will return Some(Duration).

    requiredSuccessRate

    successRate that must be met

    window

    window over which the success rate is tracked. window requests must occur for markDeadOnFailure() to ever return Some(Duration)

    markDeadFor

    stream of durations to use for the next duration returned from markDeadOnFailure()

    See also

    com.twitter.finagle.util.Ema for how the success rate is computed

  18. def successRateWithinDuration(requiredSuccessRate: Double, window: Duration, markDeadFor: Stream[Duration]): FailureAccrualPolicy

    Returns a policy based on an exponentially-weighted moving average success rate over a time window.

    Returns a policy based on an exponentially-weighted moving average success rate over a time window. A moving average is used so the success rate calculation is biased towards more recent requests.

    If the computed weighted success rate is less than the required success rate, markDeadOnFailure() will return Some(Duration).

    requiredSuccessRate

    successRate that must be met

    window

    window over which the success rate is tracked. markDeadOnFailure() will return None, until we get requests for a duration of at least window.

    markDeadFor

    stream of durations to use for the next duration returned from markDeadOnFailure()

    See also

    com.twitter.finagle.util.Ema for how the success rate is computed

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