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  • 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 netty4

    Package netty4 implements the bottom finagle primitives: com.twitter.finagle.Server and a client transport in terms of the netty4 event loop.

    Package netty4 implements the bottom finagle primitives: com.twitter.finagle.Server and a client transport in terms of the netty4 event loop.

    Definition Classes
    finagle
  • package threading
    Definition Classes
    netty4
  • EventLoopGroupExecutionDelayTracker
o

com.twitter.finagle.netty4.threading

EventLoopGroupExecutionDelayTracker

object EventLoopGroupExecutionDelayTracker

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  17. def track(nettyEventLoopGroup: EventLoopGroup, injectionPeriod: Duration, dumpThreshold: Duration, statsReceiver: StatsReceiver, dumpThreadPoolName: String, logger: Logger): Unit

    Tracks execution delays in all the threads of a netty EventLoopGroup, by inserting runnables that execute with a fixed delay of watchPeriod.

    Tracks execution delays in all the threads of a netty EventLoopGroup, by inserting runnables that execute with a fixed delay of watchPeriod. Reports stats under workerpool/deviation_ms. Submitting the same EventLoopGroup to this twice will cause the second submission to be ignored to avoid double instrumentation.

    nettyEventLoopGroup

    The netty EventLoopGroup for which thread delays should be captured

    injectionPeriod

    The fixed delay for the runnables added to the EventLoopGroup threads to capture thread execution delays.

    dumpThreshold

    If > 0ms log seen delay for threads and the stack trace for threads at the when the threads exceed the dumpThreshold delay.

    statsReceiver

    The stats receiver under which execution delay stats should be reported.

    dumpThreadPoolName

    The name of the thread pool to be created for dumping thread stacks.

    logger

    The logger to be used to log thread dumps.

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