Object

com.thoughtworks.raii

asynchronouspool

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object asynchronouspool

The namespace that contains the implementation of the asynchronous resource pool.

Source
asynchronouspool.scala
Example:

  1. Given a factory that creates resources,

    import scalaz.Tags.Parallel
import scalaz._
import scalaz.syntax.tag._
import scalaz.syntax.all._
import com.thoughtworks.future._
import com.thoughtworks.raii.asynchronous._
import com.thoughtworks.raii.asynchronouspool._
import java.lang.AutoCloseable
trait MyResource extends AutoCloseable {
  def inUse(): Unit
}
val myResourceStub0 = stub[MyResource]
println(s"myResourceStub0: ${myResourceStub0.isInstanceOf[MyResource]}")
println(s"myResourceStub0: ${myResourceStub0.isInstanceOf[MyResource]}")
val myResourceStub1 = stub[MyResource]
val myResourceStub2 = stub[MyResource]
val myResourceFactoryMock = mockFunction[MyResource]
myResourceFactoryMock.expects().returns(myResourceStub0)
myResourceFactoryMock.expects().returns(myResourceStub1)
myResourceFactoryMock.expects().returns(myResourceStub2)

    then it can be converted to a resource pool, which holds some instances of MyResource.

    def w = myResourceFactoryMock()
val myResourcePool: Do[Do[MyResource]] = pool(Do.autoCloseable(w), capacity = 3)

    When some clients are using the resource pool,

    def client(doMyResource: Do[MyResource], operationsPerClient: Int): Do[Unit] = {
  Do.nested[Unit](doMyResource.flatMap { myResource =>
    Do.execute {
        myResource.inUse
      }
      .replicateM_(operationsPerClient)
  })
}
def allClients(doMyResource: Do[MyResource], numberOfClients: Int, operationsPerClient: Int): ParallelDo[Unit] = {
  implicit def keepLastException = new Semigroup[Throwable] {
    override def append(f1: Throwable, f2: => Throwable) = f2
  }
  Applicative[ParallelDo].replicateM_(numberOfClients, Parallel(client(doMyResource, operationsPerClient)))
}
def usingPool(numberOfClients: Int, operationsPerClient: Int) = {
  myResourcePool.flatMap { doMyResource =>
    allClients(doMyResource, numberOfClients, operationsPerClient).unwrap
  }
}

    then the operations from these clients should be distributed on those MyResources, and those MyResources should be closed after being used.

    usingPool(numberOfClients = 10, operationsPerClient = 10).run.map { _: Unit =>
  ((myResourceStub0.inUse _): () => Unit).verify().repeated(30 to 40)
  ((myResourceStub0.close _): () => Unit).verify().once()
  ((myResourceStub1.inUse _): () => Unit).verify().repeated(30 to 40)
  ((myResourceStub1.close _): () => Unit).verify().once()
  ((myResourceStub2.inUse _): () => Unit).verify().repeated(30 to 40)
  ((myResourceStub2.close _): () => Unit).verify().once()
  succeed
}.toScalaFuture
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Type Members

  1. final class ClosedPoolException extends IllegalStateException

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Value Members

  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. final def asInstanceOf[T0]: T0

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  5. def clone(): AnyRef

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  6. final def eq(arg0: AnyRef): Boolean

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  7. def equals(arg0: Any): Boolean

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  8. def finalize(): Unit

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  9. final def getClass(): Class[_]

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  10. def hashCode(): Int

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  11. final def isInstanceOf[T0]: Boolean

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  12. final def ne(arg0: AnyRef): Boolean

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  13. final def notify(): Unit

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  14. final def notifyAll(): Unit

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  15. def pool[A](doA: Do[A], capacity: Int): Do[Do[A]]

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  16. final def synchronized[T0](arg0: ⇒ T0): T0

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  17. def toString(): String

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  18. final def wait(): Unit

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  19. final def wait(arg0: Long, arg1: Int): Unit

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  20. final def wait(arg0: Long): Unit

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