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 pool
    Definition Classes
    finagle
  • BufferingPool
  • SingletonPool
  • WatermarkPool
c

com.twitter.finagle.pool

SingletonPool

class SingletonPool[Req, Rep] extends ServiceFactory[Req, Rep]

A pool that maintains at most one service from the underlying ServiceFactory -- concurrent leases share the same, cached service. A new Service is established whenever the service factory fails or the current service has become unavailable.

Linear Supertypes
ServiceFactory[Req, Rep], Closable, (ClientConnection) => Future[Service[Req, Rep]], AnyRef, Any
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. SingletonPool
  2. ServiceFactory
  3. Closable
  4. Function1
  5. AnyRef
  6. Any
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new SingletonPool(underlying: ServiceFactory[Req, Rep], allowInterrupts: Boolean, statsReceiver: StatsReceiver)

    underlying

    the underlying shared resource which the pool manages.

    allowInterrupts

    Because the pool hands back a shared resource, it may be useful to manage interrupts such that they are isolated from independent service acquisition requests. Thus, setting this value to false will ensure that an outstanding dispatch to the underlying resource from the pool is uninterruptible but individual service acquisition requests are.

    statsReceiver

    the StatsReceiver that is used to report pool specific stats.

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[A](g: (Future[Service[Req, Rep]]) => A): (ClientConnection) => A
    Definition Classes
    Function1
    Annotations
    @unspecialized()
  5. final def apply(conn: ClientConnection): Future[Service[Req, Rep]]

    Reserve the use of the returned Service instance.

    Reserve the use of the returned Service instance.

    To relinquish the use of the reserved Service, the user must call Service.close().

    conn

    will be ClientConnection.nil when called on the client-side.

    Definition Classes
    SingletonPool → ServiceFactory → Function1
    Annotations
    @tailrec()
  6. final def apply(): Future[Service[Req, Rep]]

    Reserve the use of the returned Service instance using ClientConnection.nil.

    Reserve the use of the returned Service instance using ClientConnection.nil.

    To relinquish the use of the reserved Service, the user must call Service.close().

    Definition Classes
    ServiceFactory
  7. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  8. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  9. final def close(deadline: Time): Future[Unit]

    <invalid inheritdoc annotation>

    <invalid inheritdoc annotation>

    SingletonPool closes asynchronously; the underlying connection is closed once all references are returned.

    Definition Classes
    SingletonPool → Closable
  10. def close(after: Duration): Future[Unit]
    Definition Classes
    Closable
  11. final def close(): Future[Unit]
    Definition Classes
    Closable
  12. def compose[A](g: (A) => ClientConnection): (A) => Future[Service[Req, Rep]]
    Definition Classes
    Function1
    Annotations
    @unspecialized()
  13. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  15. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  16. def flatMap[Req1, Rep1](f: (Service[Req, Rep]) => Future[Service[Req1, Rep1]]): ServiceFactory[Req1, Rep1]

    Apply f on created services, returning the resulting Future in their stead.

    Apply f on created services, returning the resulting Future in their stead. This is useful for implementing common factory wrappers that only need to modify or operate on the underlying service.

    Definition Classes
    ServiceFactory
  17. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  18. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  19. final def isAvailable: Boolean

    Return true if and only if status is currently Status.Open.

    Return true if and only if status is currently Status.Open.

    Definition Classes
    ServiceFactory
  20. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  21. def map[Req1, Rep1](f: (Service[Req, Rep]) => Service[Req1, Rep1]): ServiceFactory[Req1, Rep1]

    Map created services.

    Map created services. Useful for implementing common styles of factory wrappers.

    Definition Classes
    ServiceFactory
  22. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  23. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  24. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  25. def status: Status

    The current availability Status of this ServiceFactory

    The current availability Status of this ServiceFactory

    The status of a SingletonPool is the worse of the the underlying status and the status of the currently cached service, if any.

    Definition Classes
    SingletonPool → ServiceFactory
  26. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  27. final def toService: Service[Req, Rep]

    Make a service that after dispatching a request on that service, releases the service.

    Make a service that after dispatching a request on that service, releases the service.

    Definition Classes
    ServiceFactory
  28. def toString(): String
    Definition Classes
    ServiceFactory → Function1 → AnyRef → Any
  29. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  30. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  31. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from ServiceFactory[Req, Rep]

Inherited from Closable

Inherited from (ClientConnection) => Future[Service[Req, Rep]]

Inherited from AnyRef

Inherited from Any

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