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.

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 http

Definition Classes: finagle

package codec

Definition Classes: http

package collection

Definition Classes: http

package cookie

Definition Classes: http

package exp

Definition Classes: http

package filter

Definition Classes: http

package headers

Definition Classes: http

package param

Definition Classes: http

package path

Definition Classes: http

package service

Definition Classes: http

package util

Definition Classes: http

AuthenticatedIdentityContext

Chunk

CookieMap

CookieMapVersionSpecific

HeaderMapVersionSpecific

KerberosAuthenticationFilter

LoadBalancedHostFilter

ParamMapVersionSpecific

TooLongMessageException

Uri

Version

defaultClientProtocol

defaultServerProtocol

serverErrorsAsFailures

com.twitter.finagle.http

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object MediaType

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val Atom: String
val Csv: String
val Gif: String
val Html: String
val HtmlUtf8: String
val Iframe: String
val Javascript: String
val Jpeg: String
val Json: String
val JsonPatch: String
val JsonUtf8: String
val MultipartForm: String
val OctetStream: String
val PlainText: String
val PlainTextUtf8: String
val Png: String
val Rss: String
val Txt: String
val WwwForm: String
val Xls: String
val Xml: String
val XmlUtf8: String
val Zip: String
def addUtf8Charset(mediaType: String): String
Adds a utf-8 charset parameter to a media type string.
Adds a utf-8 charset parameter to a media type string.
Note that if a charset is already set that it will add a second one, it does not inspect the provided media type.
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def typeEquals(left: String, right: String): Boolean
Checks equality for two media types, based on their type and subtype.
Checks equality for two media types, based on their type and subtype.
This ignores media type parameters and suffixes.
final def wait(): Unit
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