Scala example source code file (boundedbuffer.scala)

This example Scala source code file (boundedbuffer.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

a, a, array, array, boolean, boundedbuffer, boundedbuffer, classmanifest, int, n, n, string

The Scala boundedbuffer.scala source code

package examples

object boundedbuffer {

  import concurrent.ops._

  class BoundedBuffer[A](N: Int)(implicit m: ClassManifest[A]) {
    var in, out, n = 0
    val elems = new Array[A](N)

    def await(cond: => Boolean) = while (!cond) { wait() }

    def put(x: A) = synchronized {
      await (n < N)
      elems(in) = x; in = (in + 1) % N; n += 1
      if (n == 1) notifyAll()
    }

    def get: A = synchronized {
      await (n != 0)
      val x = elems(out); out = (out + 1) % N ; n -= 1
      if (n == N - 1) notifyAll()
      x
    }
  }

  def kill(delay: Int) = new java.util.Timer().schedule(
    new java.util.TimerTask {
      override def run() = {
        println("[killed]")
        System.exit(0)
      }
    },
    delay) // in milliseconds

  def main(args: Array[String]) {
    val buf = new BoundedBuffer[String](10)
    var cnt = 0
    def produceString = { cnt += 1; cnt.toString() }
    def consumeString(ss: String) = println(ss)
    spawn { while (true) { val ssss = produceString; buf.put(ssss) } }
    spawn { while (true) { val s = buf.get; consumeString(s) } }
    kill(1000)
  }

}