Packages

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

    Start with com.twitter.finagle.

    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 logging
    Definition Classes
    finagle
  • SlowTracesFilter
c

com.twitter.finagle.logging

SlowTracesFilter

class SlowTracesFilter extends TypeAgnostic

Logs trace ids that are slower than percentile of other requests.

Note that because this only logs very slow traces that are also sampled, during normal operation you should expect (1 - percentile) * sampleRate requests to be loggged.

So if your sample rate is 1/10,000 and you're looking for p99 latency, you will expect to see 1 out of every 1,000,000 requests sampled. However, when your service is overloaded, you will see a much higher proportion of requests sampled.

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TypeAgnostic, AnyRef, Any
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Instance Constructors

  1. new SlowTracesFilter(percentile: Double)

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def andThen[Req, Rep](factory: ServiceFactory[Req, Rep]): ServiceFactory[Req, Rep]

    Convert this to an appropriately-typed Filter and compose with andThen.

    Convert this to an appropriately-typed Filter and compose with andThen.

    Definition Classes
    TypeAgnostic
  5. def andThen[Req, Rep](svc: Service[Req, Rep]): Service[Req, Rep]

    Convert this to an appropriately-typed Filter and compose with andThen.

    Convert this to an appropriately-typed Filter and compose with andThen.

    Definition Classes
    TypeAgnostic
  6. def andThen[ReqIn, RepOut, ReqOut, RepIn](next: Filter[ReqIn, RepOut, ReqOut, RepIn]): Filter[ReqIn, RepOut, ReqOut, RepIn]

    Convert this to an appropriately-typed Filter and compose with andThen.

    Convert this to an appropriately-typed Filter and compose with andThen.

    Definition Classes
    TypeAgnostic
  7. def andThen(next: TypeAgnostic): TypeAgnostic
    Definition Classes
    TypeAgnostic
  8. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  9. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  10. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  11. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  12. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  13. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  14. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  15. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  16. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  17. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  18. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  19. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  20. def toFilter[Req, Rep]: Filter[Req, Rep, Req, Rep]
    Definition Classes
    SlowTracesFilter → TypeAgnostic
  21. def toString(): String
    Definition Classes
    TypeAgnostic → AnyRef → Any
  22. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  23. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  24. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from TypeAgnostic

Inherited from AnyRef

Inherited from Any

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