Packages

type ResourceT[F[+_], +A] = covariant.OpacityTypes.ResourceT[F, A]

The data structure that provides automatic resource management.

Source
covariant.scala
Example:

  1. ResourceT can be used as a monad transformer for scalaz.Name

    import scalaz.Name
import com.thoughtworks.raii.covariant._
type RAII[A] = ResourceT[Name, A]

    Given a resource that creates temporary files

    import java.io.File
val resource: RAII[File] = ResourceT(Name(new Releasable[Name, File] {
  override val value: File = File.createTempFile("test", ".tmp");
  override val release: Name[Unit] = Name {
    val isDeleted = value.delete()
  }
}))

    when using temporary file created by resouce in a for / yield block, those temporary files should be available.

    import scalaz.syntax.all._
val usingResouce = for {
  tmpFile1 <- resource
  tmpFile2 <- resource
} yield {
  tmpFile1 shouldNot be(tmpFile2)
  tmpFile1 should exist
  tmpFile2 should exist
  (tmpFile1, tmpFile2)
}

    and those files should have been deleted after the for / yield block.

    val (tmpFile1, tmpFile2) = usingResouce.run.value
tmpFile1 shouldNot exist
tmpFile2 shouldNot exist
Note

This ResourceT type is an opacity alias to F[Releasable[F, A]]. All type classes and helper functions for this ResourceT type are defined in the companion object ResourceT

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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def getClass(): Class[_]
    Definition Classes
    Any

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    Any
  2. final def ##(): Int
    Definition Classes
    Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def equals(arg0: Any): Boolean
    Definition Classes
    Any
  6. def hashCode(): Int
    Definition Classes
    Any
  7. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  8. def toString(): String
    Definition Classes
    Any

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