jedws

package stuff

import akka.actor.{ Actor, actorRef2Scala }
import kadai.log.Logging
import spray.http.{ HttpFailure, HttpResponse }
import spray.http.HttpEntity.apply

trait IOActor extends Actor {
  log: Logging =>

pchiusano

package typealigned

import scalaz.{Leibniz,Monad,Need}
import Leibniz.===

/** Typeclass for type-aligned sequences. */
trait Sequence[Q[_[_,_],_,_]] { self =>
  import syntax._
  def empty[C[_,_],a]: Q[C,a,a]
  def singleton[C[_,_],a,b](c: C[a,b]): Q[C,a,b]

pchiusano

object Amortized {

  /**
   * Amortized constant time counter. Maintains the invariant that
   * `chunks` are of exponentially decreasing sizes. May perform a
   * logarithmic number of `op` reductions per `snoc` (worst case),
   * but a series of `n` snocs will on average require `2n` reductions.
   */
  case class Counter[A](chunks: Vector[A]) {
    def snoc(size: A => Long, op: (A,A) => A)(a: A): Counter[A] = {

propensive

// Define the general Arg type and companion object:
import language.higherKinds, language.implicitConversions, language.existentials
object Arg { implicit def toArg[Tc[_], T: Tc](t: T): Arg[T, Tc] = Arg(t, implicitly[Tc[T]]) }
case class Arg[T, Tc[_]](value: T, typeclass: Tc[T])

// Say, for example we have a typeclass for getting the length of something, with a few instances
trait Lengthable[T] { def length(t: T): Int }
implicit val intLength = new Lengthable[Int] { def length(i: Int) = 1 }
implicit val stringLength = new Lengthable[String] { def length(s: String) = s.length }

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