djspiewak

Introduction to scalaz-stream

Every application ever written can be viewed as some sort of transformation on data. Data can come from different sources, such as a network or a file or user input or the Large Hadron Collider. It can come from many sources all at once to be merged and aggregated in interesting ways, and it can be produced into many different output sinks, such as a network or files or graphical user interfaces. You might produce your output all at once, as a big data dump at the end of the world (right before your program shuts down), or you might produce it more incrementally. Every application fits into this model.

The scalaz-stream project is an attempt to make it easy to construct, test and scale programs that fit within this model (which is to say, everything). It does this by providing an abstraction around a "stream" of data, which is really just this notion of some number of data being sequentially pulled out of some unspecified data source. On top of this abstraction, sca

markmarch

def drop[T](list: List[T], n: Int): List[T] = {
    @tailrec
    def loop(l: List[T], n: Int): List[T] = l match {
      case Nil => l
      case _ if n == 0 => l
      case x :: xs => loop(xs, n - 1)
    }
    loop(list, n)
  }

chrsan

package akka.unfiltered

import akka.actor._
import akka.dispatch.Future
import akka.pattern.ask
import akka.util.duration._
import akka.util.Timeout

import unfiltered.Async
import unfiltered.request._

bwmcadams

package controllers

import play.api._
import play.api.mvc._

import com.novus.salat._
import com.novus.salat.global._
import com.novus.salat.dao._

import util._

lucasfais

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viktorklang

trait Enum { //DIY enum type
  import java.util.concurrent.atomic.AtomicReference //Concurrency paranoia

  type EnumVal <: Value //This is a type that needs to be found in the implementing class

  private val _values = new AtomicReference(Vector[EnumVal]()) //Stores our enum values

  //Adds an EnumVal to our storage, uses CCAS to make sure it's thread safe, returns the ordinal
  private final def addEnumVal(newVal: EnumVal): Int = { import _values.{get, compareAndSet => CAS}
    val oldVec = get