ericacm

Scala Links

Eric Pederson

• [email protected]
• Blog
• LinkedIn
• Twitter
• StackOverflow
• GitHub

retronym

package scalaz.example


object Reader extends App {

  /**
   * Manual propagation of the environment (in the example, `contextRoot`.)
   */
  object Config0 {
    def fragment1(contextRoot: String) = <a href={contextRoot + "/foo"}>foo</a>

viktorklang

// ©2012 Viktor Klang

package akka.klang

import akka.dispatch.{ DispatcherPrerequisites, ExecutorServiceFactory, ExecutorServiceConfigurator }
import com.typesafe.config.Config
import java.util.concurrent.{ ExecutorService, AbstractExecutorService, ThreadFactory, TimeUnit }
import java.util.Collections
import javax.swing.SwingUtilities

viktorklang

// © 2012 Viktor Klang

import akka.dispatch.ExecutionContext
import javax.swing.SwingUtilities
import java.util.concurrent.Executor

//
object SwingExecutionContext {
  implicit val swingExecutionContext: ExecutionContext = ExecutionContext.fromExecutor(new Executor {
    def execute(command: Runnable): Unit = SwingUtilities invokeLater command

stonegao

import akka.actor.Actor
import akka.actor.ActorSystem
import akka.agent.Agent
import com.typesafe.config.ConfigFactory
import akka.event.Logging
import akka.actor.Props
import kafka.utils.Utils
import java.nio.ByteBuffer

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

chrsan

package se.fishtank;

import java.net.URI;
import java.util.Map;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.sift.Discriminator;
import ch.qos.logback.core.spi.ContextAwareBase;

public class AkkaSourceDiscriminator extends ContextAwareBase implements Discriminator<ILoggingEvent> {

folone

case class State[S, +A](run: S ⇒ (A, S))  {
  def map[B](f: A => B): State[S, B] =
    State(s ⇒ {
      val (a, t) = run(s)
      (f(a), t)
    })

  def flatMap[B](f: A ⇒ State[S, B]): State[S, B] =
    State(s ⇒ {
      val (a, t) = run(s)

ymasory

Please help compile a list of all Scala-related IRC rooms.

All of these channels are on Freenode.

#akka              | concurrency & distribution framework
#argonaut          | json library
#fp-in-scala       | the book Functional Programming in Scala
#geotrellis        | geoprocessing library
#indyscala         | regional scala group
#json4s            | json library

viktorklang

 /**
   * "Select" off the first future to be satisfied.  Return this as a
   * result, with the remainder of the Futures as a sequence.
   *
   * @param fs a scala.collection.Seq
   */
  def select[A](fs: Seq[Future[A]])(implicit ec: ExecutionContext): Future[(Try[A], Seq[Future[A]])] = {
    @tailrec
    def stripe(p: Promise[(Try[A], Seq[Future[A]])],
               heads: Seq[Future[A]],