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@timperrett
timperrett / gist:6224373
Created August 13, 2013 18:49
Shapeless typed element selection
Welcome to Scala version 2.9.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_25).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import shapeless._, HList._
import shapeless._
import HList._
scala> "foo" :: 124 :: HNil
res0: shapeless.::[java.lang.String,shapeless.::[Int,shapeless.HNil]] = foo :: 124 :: HNil
@jroper
jroper / Global.scala
Last active December 20, 2015 19:38
Transparent HEAD request handling in Play 2.1. Note that it may be more efficient to implement HEAD support in an action directly, as this may avoid unnecessary opening of resources or rendering things.
import play.api.libs.iteratee.{Done, Iteratee, Enumerator}
import play.api.mvc._
import play.api._
import play.api.libs.concurrent.Execution.Implicits._
object Global extends GlobalSettings {
override def onRouteRequest(req: RequestHeader) = {
// Lookup handler
super.onRouteRequest(req) match {
@milessabin
milessabin / gist:6081113
Last active December 20, 2015 05:49
Slicing and dicing tuples in shapeless 2.0.0-SNAPSHOT.
Welcome to Scala version 2.10.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_21).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import shapeless._
import shapeless._
scala> import syntax.tuple._
import syntax.tuple._
@patriknw
patriknw / LoggingMailbox.scala
Last active January 5, 2023 08:12
Logs the mailbox size when exceeding the configured limit. Implemented in Scala and Java. Copy one of them to your project and define the configuration. This code is licensed under the Apache 2 license.
/**
* Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
*/
package akka.contrib.mailbox
import scala.concurrent.duration._
import java.util.concurrent.atomic.AtomicInteger
import java.util.concurrent.atomic.AtomicLong
import com.typesafe.config.Config
import akka.actor.{ ActorContext, ActorRef, ActorSystem, ExtendedActorSystem }
@pbailis
pbailis / gist:5660980
Last active April 27, 2020 11:46
Assorted distributed database readings

Context: I was asked for a list of interesting reading relating to "distributed databases, behavior under partitions and failures, failure detection." Here's what I came up with in about an hour.

For textbooks, "Introduction to Reliable and Secure Distributed Programming" is a superb introduction to distributed computing from a formal perspective; it's really not about "programming" or "engineering" but about distributed system fundamentals like consensus, distributed registers, and broadcast. Used in Berkeley's Distributed Computing course (and HT to @lalithsuresh) Book Site

Notes from courses like Lorenzo Alvisi's Distributed Computing class can be great.

There are a bunch of classics on causality, [Paxos](ht

@seancribbs
seancribbs / 00demo.md
Last active December 16, 2015 17:09
Demo code from NoSQL Matters Cologne 2013
@viktorklang
viktorklang / InterruptibleCancellableFuture.scala
Last active June 1, 2020 13:45
Interruptible-Cancellable-scala.concurrent.Future
/*
Copyright 2018 Viktor Klang
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
@nraychaudhuri
nraychaudhuri / gist:5169177
Created March 15, 2013 11:20
Simple REST example in Play 2
//routes file
GET /ping/:message controllers.Application.restCall(message: String)
//Then my controller
object Application extends Controller {
case class SomeMessage(m: String)
implicit val someMessageFormat: Format[SomeMessage] = Json.format[SomeMessage]
@pbailis
pbailis / list.md
Last active April 15, 2018 08:54
Quick and dirty (incomplete) list of interesting, mostly recent data warehousing/"big data" papers

A friend asked me for a few pointers to interesting, mostly recent papers on data warehousing and "big data" database systems, with an eye towards real-world deployments. I figured I'd share the list. It's biased and rather incomplete but maybe of interest to someone. While many are obvious choices (I've omitted several, like MapReduce), I think there are a few underappreciated gems.

###Dataflow Engines:

Dryad--general-purpose distributed parallel dataflow engine
http://research.microsoft.com/en-us/projects/dryad/eurosys07.pdf

Spark--in memory dataflow
http://www.cs.berkeley.edu/~matei/papers/2012/nsdi_spark.pdf

@gideondk
gideondk / IterateeZMonad.scala
Last active December 12, 2015 09:49
import scalaz._
import Scalaz._
import akka.actor.IO._
object IterateeZMonad {
implicit def iterateeZMonad[A] = new Monad[Iteratee] {
override def map[A, B](fa: Iteratee[A])(f: A ⇒ B): Iteratee[B] = fa map f