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 ValueReads

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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: (A) => B)(implicit readsA: ValueReads[A]): ValueReads[B]

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

  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
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    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 optionReads[T](implicit treads: ValueReads[T]): ValueReads[Option[T]]

    Returns a ValueReads[Option[T]] that reads any NULL value as None and delegates non-NULL values to the underlying ValueReads instance.

  17. def or[T](first: ValueReads[T], second: ValueReads[T]): ValueReads[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 ValueReads[T that uses first if it accepts the PgType, otherwise uses second.

  18. implicit val readsBigDecimal: ValueReads[BigDecimal]

    Reads BigDecimal from PgType.Numeric.

  19. implicit val readsBoolean: ValueReads[Boolean]

    Reads Boolean from PgType.Bool.

  20. implicit val readsBuf: ValueReads[Buf]

    Reads Buf from PgType.Bytea.

  21. implicit val readsByte: ValueReads[Byte]

    Reads Byte from PgType.Int2.

    Reads Byte from PgType.Int2.

    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

  22. implicit val readsDouble: ValueReads[Double]

    Reads Double from PgType.Float8 or PgType.Float4.

  23. implicit val readsFloat: ValueReads[Float]

    Reads Float from PgType.Float4.

  24. val readsFloat8: ValueReads[Double]

    Reads Double from PgType.Float8.

  25. implicit val readsInet: ValueReads[Inet]

    Reads Inet from PgType.Inet.

  26. implicit val readsInstant: ValueReads[Instant]

    Reads java.time.Instant from PgType.Timestamptz or PgType.Timestamp.

  27. implicit val readsInt: ValueReads[Int]

    Reads Int from PgType.Int4 or readsShort.

  28. val readsInt4: ValueReads[Int]

    Reads Int from PgType.Int4.

  29. val readsInt8: ValueReads[Long]

    Reads Long from PgType.Int8.

  30. implicit val readsJson: ValueReads[Json]

    Reads Json from PgType.Json or PgType.Jsonb.

  31. implicit val readsLocalDate: ValueReads[LocalDate]
  32. implicit val readsLong: ValueReads[Long]

    Reads Long from PgType.Int8 or readsInt.

  33. implicit val readsShort: ValueReads[Short]

    Reads Short from PgType.Int2.

  34. implicit val readsString: ValueReads[String]

    Reads String from any of PgType.Text, PgType.Json, PgType.Varchar, PgType.Bpchar, PgType.Name, PgType.Unknown.

  35. val readsStringPermissive: ValueReads[String]

    Like readsString but is more permissive with encoding errors.

  36. implicit val readsUuid: ValueReads[UUID]

    Reads java.util.UUID from PgType.Uuid.

  37. def simple[T](expect: PgType*)(f: (Reader) => T): ValueReads[T]
  38. def simpleBuf[T](expectByteSize: Int, expect: PgType*)(f: (Buf) => T): ValueReads[T]
  39. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  40. def toString(): String
    Definition Classes
    AnyRef → Any
  41. implicit def traversableReads[F[_], T](implicit treads: ValueReads[T], f: Factory[T, F[T]]): ValueReads[F[T]]

    Returns a ValueReads for a collection of [T] from a Postgres array type.

    Returns a ValueReads for a collection of [T] from a Postgres array type.

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

  42. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  43. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  44. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

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