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 mysql

Definition Classes: finagle

package param

Definition Classes: mysql

package transport

Definition Classes: mysql

BigDecimalValue

BigIntTooLongException

ColumnNotFoundException

EOF

FailedToEncryptPasswordException

IncompatibleServerError

IncompatibleVersion

InsufficientServerCapabilitiesException

Row

UnsupportedTypeException

UseRequest

Value

ValueSerializationException

WithSql

com.twitter.finagle.mysql

Parameter

Companion object Parameter

sealed trait Parameter extends AnyRef

A value of type A can implicitly convert to a Parameter if an evidence CanBeParameter[A] is available in scope via the Parameter.wrap or Parameter.wrapOption implicits. Explicit conversions are available via Parameter.of and Parameters.of.

A Scala example with implicits:

import com.twitter.finagle.mysql.Parameter
import com.twitter.finagle.mysql.Parameter._

val p: Parameter = "this will get implicitly converted to a Parameter"

A Scala example without implicits:

import com.twitter.finagle.mysql.Parameter

val p: Parameter = Parameter.of("explicitly converted to a Parameter")

A Java example:

import com.twitter.finagle.mysql.Parameter;
import com.twitter.finagle.mysql.Parameters;

Parameter p = Parameters.of("explicitly converted to a Parameter");

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sealed trait Parameter extends AnyRef

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