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 postgresql
    Definition Classes
    finagle
  • package types
    Definition Classes
    postgresql
  • Json
  • Kind
  • PgDate
  • PgNumeric
  • PgTime
  • PgType
  • ValueReads
  • ValueWrites

object ValueWrites

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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 by[A, B](f: (B) => A)(implicit writesA: ValueWrites[A]): ValueWrites[B]

    Define a ValueWrites[B] in terms of ValueWrites[A] and B => A.

  6. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  10. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  11. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  15. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  16. implicit def optionWrites[T](implicit twrites: ValueWrites[T]): ValueWrites[Option[T]]

    Returns a ValueWrites[Option[T]] that writes NULL when the value is None and delegates to the underlying instance when the value is Some.

  17. def or[T](first: ValueWrites[T], second: ValueWrites[T]): ValueWrites[T]

    If it accepts the given PgType, uses first to read the value, otherwise, use second.

    If it accepts the given PgType, uses first to read the value, otherwise, use second.

    returns

    an instance of ValueWrites[T that uses first if it accepts the PgType, otherwise uses second.

  18. def simple[T](expect: PgType*)(write: (Writer, T) => Writer): ValueWrites[T]
  19. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  20. def toString(): String
    Definition Classes
    AnyRef → Any
  21. implicit def traversableWrites[F[X] <: Iterable[X], T](implicit twrites: ValueWrites[T]): ValueWrites[F[T]]

    Returns a ValueWrites able to write a collection of [T] to a Postgres array type.

    Returns a ValueWrites able to write a collection of [T] to a Postgres array type.

    For example, this can produce ValueWrites[List[Int] for the PgType.Int4Array type.

  22. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  23. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  24. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  25. implicit lazy val writesBigDecimal: ValueWrites[BigDecimal]

    Writes BigDecimal to PgType.Numeric.

  26. implicit lazy val writesBoolean: ValueWrites[Boolean]

    Writes Boolean to PgType.Bool.

  27. implicit lazy val writesBuf: ValueWrites[Buf]

    Writes Buf to PgType.Bytea.

  28. implicit lazy val writesByte: ValueWrites[Byte]

    Writes Byte as a Short.

    Writes Byte as a Short.

    Postgres does not have a numeric 1-byte data type. So we use 2-byte value and check bounds. NOTE: Postgres does have a 1-byte data type (i.e.: "char" with quotes), but it's very tricky to use to store numbers, so it's unlikely to be useful in practice.

    See also

    https://www.postgresql.org/docs/current/datatype-numeric.html

    https://dba.stackexchange.com/questions/159090/how-to-store-one-byte-integer-in-postgresql

  29. implicit lazy val writesDouble: ValueWrites[Double]

    Writes Double to PgType.Float8.

  30. implicit lazy val writesFloat: ValueWrites[Float]

    Writes Float to PgType.Float4 or writesDouble.

  31. lazy val writesFloat4: ValueWrites[Float]

    Writes Float to PgType.Float4.

  32. implicit lazy val writesInet: ValueWrites[Inet]

    Writes Inet to PgType.Inet.

  33. implicit lazy val writesInstant: ValueWrites[Instant]

    Writes java.time.Instant to PgType.Timestamptz or PgType.Timestamp.

  34. implicit lazy val writesInt: ValueWrites[Int]

    Writes Int to PgType.Int4 or writesLong.

  35. lazy val writesInt2: ValueWrites[Short]

    Writes Short to PgType.Int2.

  36. lazy val writesInt4: ValueWrites[Int]

    Writes Int to PgType.Int4.

  37. implicit lazy val writesJson: ValueWrites[Json]

    Writes Json to PgType.Json or PgType.Jsonb.

  38. implicit lazy val writesLocalDate: ValueWrites[LocalDate]

    Writes java.time.LocalDate to PgType.Date.

  39. implicit lazy val writesLong: ValueWrites[Long]

    Writes Long to PgType.Int8.

  40. implicit lazy val writesShort: ValueWrites[Short]

    Writes Short to PgType.Int2 or writesInt

  41. implicit lazy val writesString: ValueWrites[String]

    Writes String to any of PgType.Text, PgType.Json, PgType.Varchar, PgType.Bpchar, PgType.Name, PgType.Unknown.

  42. implicit lazy val writesUuid: ValueWrites[UUID]

    Writes java.util.UUID to PgType.Uuid.

Inherited from AnyRef

Inherited from Any

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