org.analogweb.scala.Execution.scala Maven / Gradle / Ivy

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Analogweb Framework is tiny, simple, and pluggable web framework.

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package org.analogweb.scala

import java.util.concurrent.ForkJoinPool
import scala.util.Try
import scala.concurrent.ExecutionContext

object Execution {
  object Implicits {
    implicit val defaultContext: ExecutionContext =
      create

    def create = {

      def getInt(name: String, f: String => Int): Int =
        Try(f(System.getProperty(name)))
          .getOrElse(Runtime.getRuntime.availableProcessors)
      def range(floor: Int, desired: Int, ceiling: Int): Int =
        if (ceiling < floor)
          range(ceiling, desired, floor)
        else
          scala.math.min(scala.math
                           .max(desired, floor),
                         ceiling)

      val desiredParallelism =
        range(
          getInt("analogweb.threads.min", _.toInt),
          getInt(
            "analogweb.threads", {
              case n if Some(n) == None | n == "" =>
                Runtime.getRuntime.availableProcessors
              case s if s.charAt(0) == 'x' =>
                (Runtime.getRuntime.availableProcessors * s
                  .substring(1)
                  .toDouble).ceil.toInt
              case other =>
                other.toInt
            }
          ),
          getInt("analogweb.threads.max", _.toInt)
        )
      ExecutionContext
        .fromExecutorService(new ForkJoinPool(desiredParallelism))
    }
  }
}