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 client
    Definition Classes
    finagle
  • AddrMetadataExtraction
  • BackupRequestFilter
  • DefaultPool
  • DynamicTimeout
  • EndpointerModule
  • EndpointerStackClient
  • LatencyCompensation
  • StackBasedClient
  • StackClient
  • StatsScoping
  • StdStackClient
  • Transporter
t

com.twitter.finagle.client

EndpointerStackClient

trait EndpointerStackClient[Req, Rep, This <: EndpointerStackClient[Req, Rep, This]] extends StackClient[Req, Rep] with Parameterized[This] with CommonParams[This] with ClientParams[This] with WithClientAdmissionControl[This] with WithClientTransport[This] with WithClientSession[This] with WithSessionQualifier[This]

The standard template implementation for com.twitter.finagle.client.StackClient.

See also

The user guide for further details on Finagle clients and their configuration.

StackClient.newStack for the default modules used by Finagle clients.

Linear Supertypes
WithSessionQualifier[This], WithClientSession[This], WithClientTransport[This], WithClientAdmissionControl[This], ClientParams[This], CommonParams[This], StackClient[Req, Rep], StackBasedClient[Req, Rep], Transformable[StackClient[Req, Rep]], Parameterized[This], Client[Req, Rep], AnyRef, Any
Known Subclasses
Client, Client, Client, Client, Client, Client, StdStackClient, PushStackClient
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. EndpointerStackClient
  2. WithSessionQualifier
  3. WithClientSession
  4. WithClientTransport
  5. WithClientAdmissionControl
  6. ClientParams
  7. CommonParams
  8. StackClient
  9. StackBasedClient
  10. Transformable
  11. Parameterized
  12. Client
  13. AnyRef
  14. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def copy1(stack: Stack[ServiceFactory[Req, Rep]] = this.stack, params: Params = this.params): This

    A copy constructor in lieu of defining StackClient as a case class.

    A copy constructor in lieu of defining StackClient as a case class.

    Attributes
    protected
  2. abstract def endpointer: Stackable[ServiceFactory[Req, Rep]]

    Defines the service factory, which establishes connections to a remote peer on apply and returns a service which can write messages onto the wire and read them off of the wire.

    Defines the service factory, which establishes connections to a remote peer on apply and returns a service which can write messages onto the wire and read them off of the wire.

    Concrete StackClient implementations are expected to specify this.

    Attributes
    protected
  3. abstract def params: Params

    The current parameter map.

    The current parameter map.

    Definition Classes
    StackClient → Parameterized
  4. abstract def stack: Stack[ServiceFactory[Req, Rep]]

    The current stack.

    The current stack.

    Definition Classes
    StackClient

Concrete 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. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  6. def configured[P](psp: (P, Param[P])): This

    Creates a new StackClient with parameter psp._1 and Stack Param type psp._2.

    Creates a new StackClient with parameter psp._1 and Stack Param type psp._2.

    Definition Classes
    EndpointerStackClient → StackClient → Parameterized
  7. def configured[P](p: P)(implicit arg0: Param[P]): This

    Creates a new StackClient with parameter p.

    Creates a new StackClient with parameter p.

    Definition Classes
    EndpointerStackClient → StackClient → Parameterized
  8. def configuredParams(newParams: Params): This

    Creates a new StackClient with additional parameters newParams.

    Creates a new StackClient with additional parameters newParams.

    Definition Classes
    EndpointerStackClient → StackClient → Parameterized
  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  11. def filtered(filter: Filter[Req, Rep, Req, Rep]): This

    Prepends filter to the top of the client.

    Prepends filter to the top of the client. That is, after materializing the client (newClient/newService) filter will be the first element which requests flow through. This is a familiar chaining combinator for filters and is particularly useful for StdStackClient implementations that don't expose services but instead wrap the resulting service with a rich API.

  12. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  13. final def getClass(): Class[_]
    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. def newClient(dest: Name, label0: String): ServiceFactory[Req, Rep]

    Create a new client connected to dest.

    Create a new client connected to dest. See the user guide for details on destination names.

    Argument label is used to assign a label to this client. The label is used to display stats, etc.

    label0

    if an empty String is provided, then the label from the Label Stack.Params is used. If that is also an empty String, then dest is used.

    Definition Classes
    EndpointerStackClient → Client
  18. final def newClient(dest: String, label: String): ServiceFactory[Req, Rep]

    Create a new client connected to dest.

    Create a new client connected to dest. See the user guide for details on destination names.

    Argument label is used to assign a label to this client. The label is used to display stats, etc.

    Definition Classes
    Client
  19. final def newClient(dest: String): ServiceFactory[Req, Rep]

    Create a new client connected to dest.

    Create a new client connected to dest. See the user guide for details on destination names.

    Definition Classes
    Client
  20. def newService(dest: Name, label: String): Service[Req, Rep]

    Create a new service which dispatches requests to dest.

    Create a new service which dispatches requests to dest. See the user guide for details on destination names.

    Argument label is used to assign a label to this client. The label is used to display stats, etc.

    Definition Classes
    EndpointerStackClient → Client
  21. final def newService(dest: String, label: String): Service[Req, Rep]

    Create a new service which dispatches requests to dest.

    Create a new service which dispatches requests to dest. See the user guide for details on destination names.

    Definition Classes
    Client
  22. final def newService(dest: String): Service[Req, Rep]

    Create a new service which dispatches requests to dest.

    Create a new service which dispatches requests to dest. See the user guide for details on destination names.

    Definition Classes
    Client
  23. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  24. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  25. final def registerTransporter(transporterName: String): Unit

    Export info about the transporter type so that we can query info about its implementation at runtime.

    Export info about the transporter type so that we can query info about its implementation at runtime.

    Attributes
    protected
    Definition Classes
    StackClient
  26. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  27. def toString(): String
    Definition Classes
    AnyRef → Any
  28. def transformed(t: Stack.Transformer): StackClient[Req, Rep]

    Definition Classes
    StackClient → Transformable
    See also

    withStack

  29. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  30. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  31. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  32. val withAdmissionControl: ClientAdmissionControlParams[This]

    An entry point for configuring the clients' admission control

    An entry point for configuring the clients' admission control

    Definition Classes
    WithClientAdmissionControl
  33. def withExceptionStatsHandler(exceptionStatsHandler: ExceptionStatsHandler): This

    Configures this server or client with given exception stats handler.

    Configures this server or client with given exception stats handler.

    Definition Classes
    CommonParams
  34. def withLabel(label: String): This

    Configures this server or client with given label (default: empty string).

    Configures this server or client with given label (default: empty string).

    The label value is used for stats reporting to scope stats reported from different clients/servers to a single stats receiver.

    Definition Classes
    CommonParams
  35. def withMonitor(monitor: Monitor): This

    Configures this server or client with given util.Monitor (default: com.twitter.finagle.util.DefaultMonitor).

    Configures this server or client with given util.Monitor (default: com.twitter.finagle.util.DefaultMonitor).

    Definition Classes
    CommonParams
  36. def withParams(params: Params): This

    Creates a new StackClient with params used to configure this StackClient's stack.

    Creates a new StackClient with params used to configure this StackClient's stack.

    Definition Classes
    EndpointerStackClient → StackClient → Parameterized
  37. def withRequestTimeout(timeout: Tunable[Duration]): This

    Configures the Tunable request timeout of this server or client (if applying the Tunable produces a value of None, an unbounded timeout is used for the request).

    Configures the Tunable request timeout of this server or client (if applying the Tunable produces a value of None, an unbounded timeout is used for the request).

    If the request has not completed within the Duration resulting from timeout.apply(), the pending work will be interrupted via com.twitter.util.Future.raise.

    Client's Request Timeout

    The client request timeout is the maximum amount of time given to a single request (if there are retries, they each get a fresh request timeout). The timeout is applied only after a connection has been acquired. That is: it is applied to the interval between the dispatch of the request and the receipt of the response.

    Server's Request Timeout

    The server request timeout is the maximum amount of time, a server is allowed to spend handling the incoming request. Using the Finagle terminology, this is an amount of time after which a non-satisfied future returned from the user-defined service times out.

    Definition Classes
    CommonParams
    See also

    https://twitter.github.io/finagle/guide/Clients.html#timeouts-expiration and https://twitter.github.io/finagle/guide/Configuration.html#tunables

  38. def withRequestTimeout(timeout: Duration): This

    Configures the request timeout of this server or client (default: unbounded).

    Configures the request timeout of this server or client (default: unbounded).

    If the request has not completed within the given timeout, the pending work will be interrupted via com.twitter.util.Future.raise.

    Client's Request Timeout

    The client request timeout is the maximum amount of time given to a single request (if there are retries, they each get a fresh request timeout). The timeout is applied only after a connection has been acquired. That is: it is applied to the interval between the dispatch of the request and the receipt of the response.

    Server's Request Timeout

    The server request timeout is the maximum amount of time, a server is allowed to spend handling the incoming request. Using the Finagle terminology, this is an amount of time after which a non-satisfied future returned from the user-defined service times out.

    Definition Classes
    CommonParams
    See also

    https://twitter.github.io/finagle/guide/Clients.html#timeouts-expiration

  39. def withResponseClassifier(responseClassifier: ResponseClassifier): This

    Configure a com.twitter.finagle.service.ResponseClassifier which is used to determine the result of a request/response.

    Configure a com.twitter.finagle.service.ResponseClassifier which is used to determine the result of a request/response.

    This allows developers to give Finagle the additional application-specific knowledge necessary in order to properly classify responses. Without this, Finagle cannot make judgements about application-level failures as it only has a narrow understanding of failures (for example: transport level, timeouts, and nacks).

    As an example take an HTTP server that returns a response with a 500 status code. To Finagle this is a successful request/response. However, the application developer may want to treat all 500 status codes as failures and can do so via setting a com.twitter.finagle.service.ResponseClassifier.

    ResponseClassifier is a PartialFunction and as such multiple classifiers can be composed together via PartialFunction.orElse.

    Response classification is independently configured on the client and server. For client-side response classification using com.twitter.finagle.builder.ClientBuilder, see com.twitter.finagle.builder.ClientBuilder.responseClassifier

    Definition Classes
    CommonParams
    Note

    If unspecified, the default classifier is com.twitter.finagle.service.ResponseClassifier.Default which is a total function fully covering the input domain.

    See also

    com.twitter.finagle.http.service.HttpResponseClassifier for some HTTP classification tools.

  40. def withRetryBackoff(backoff: Stream[Duration]): This

    Configures the requeue backoff policy of this client (default: no delay).

    Configures the requeue backoff policy of this client (default: no delay).

    The backoff policy is represented by a stream of delays (i.e., Stream[Duration]) used to delay each retry.

    Definition Classes
    ClientParams
    See also

    https://twitter.github.io/finagle/guide/Clients.html#retries

  41. def withRetryBudget(budget: RetryBudget): This

    Configures the retry budget of this client (default: allows for about 20% of the total requests to be retried on top of 10 retries per second).

    Configures the retry budget of this client (default: allows for about 20% of the total requests to be retried on top of 10 retries per second).

    This budget is shared across requests and governs the number of retries that can be made by this client.

    Definition Classes
    ClientParams
    Note

    The retry budget helps prevent clients from overwhelming the downstream service.

    See also

    https://twitter.github.io/finagle/guide/Clients.html#retries

  42. val withSession: ClientSessionParams[This]

    An entry point for configuring the client's session.

    An entry point for configuring the client's session.

    Definition Classes
    WithClientSession
  43. val withSessionQualifier: SessionQualificationParams[This]

    An entry point for configuring the client's session qualifiers (e.g.

    An entry point for configuring the client's session qualifiers (e.g. circuit breakers).

    Definition Classes
    WithSessionQualifier
    See also

    https://twitter.github.io/finagle/guide/Clients.html#circuit-breaking

  44. def withStack(fn: (Stack[ServiceFactory[Req, Rep]]) ⇒ Stack[ServiceFactory[Req, Rep]]): This

    A new StackClient using the function to create a new Stack.

    A new StackClient using the function to create a new Stack.

    The input to fn is the client's current stack. This API allows for easier usage when writing code that uses method chaining.

    This method is similar to transformed while providing easier API ergonomics for one-off Stack changes.

    Definition Classes
    EndpointerStackClient → StackClient
    Example:

    1. From Scala:

      import com.twitter.finagle.Http

Http.client.withStack(_.prepend(MyStackModule))

      From Java:

      import com.twitter.finagle.Http;
import static com.twitter.util.Function.func;

Http.client().withStack(func(stack -> stack.prepend(MyStackModule)));
    See also

    withStack(Stack)

    transformed

  45. def withStack(stack: Stack[ServiceFactory[Req, Rep]]): This

    A new StackClient with the provided stack.

    A new StackClient with the provided stack.

    Definition Classes
    EndpointerStackClient → StackClient
    See also

    withStack that takes a Function1 for a more ergonomic API when used with method chaining.

  46. def withStatsReceiver(statsReceiver: StatsReceiver): This

    Configures this server or client with given stats.StatsReceiver (default: stats.DefaultStatsReceiver).

    Configures this server or client with given stats.StatsReceiver (default: stats.DefaultStatsReceiver).

    Definition Classes
    CommonParams
  47. def withTracer(tracer: Tracer): This

    Configures this server or client with given tracing.Tracer (default: com.twitter.finagle.tracing.DefaultTracer).

    Configures this server or client with given tracing.Tracer (default: com.twitter.finagle.tracing.DefaultTracer).

    Definition Classes
    CommonParams
  48. val withTransport: ClientTransportParams[This]

    An entry point for configuring the client's com.twitter.finagle.transport.Transport.

    An entry point for configuring the client's com.twitter.finagle.transport.Transport.

    Transport is a Finagle abstraction over the network connection (i.e., a TCP connection).

    Definition Classes
    WithClientTransport

Deprecated Value Members

  1. def transformed(f: (Stack[ServiceFactory[Req, Rep]]) ⇒ Stack[ServiceFactory[Req, Rep]]): This

    Creates a new StackClient with f applied to stack.

    Creates a new StackClient with f applied to stack.

    This is the same as withStack.

    Annotations
    @deprecated
    Deprecated

    (Since version 2018-10-30) Use withStack(Stack[ServiceFactory[Req, Rep]] => Stack[ServiceFactory[Req, Rep]]) instead

Inherited from WithSessionQualifier[This]

Inherited from WithClientSession[This]

Inherited from WithClientTransport[This]

Inherited from WithClientAdmissionControl[This]

Inherited from ClientParams[This]

Inherited from CommonParams[This]

Inherited from StackClient[Req, Rep]

Inherited from StackBasedClient[Req, Rep]

Inherited from Transformable[StackClient[Req, Rep]]

Inherited from Parameterized[This]

Inherited from Client[Req, Rep]

Inherited from AnyRef

Inherited from Any

Ungrouped