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/**
* "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]],
@kevinwright
kevinwright / scaladays2014.md
Last active March 8, 2018 20:25
Scaladays 2014 slides

As compiled by Kevin Wright a.k.a @thecoda

(executive producer of the movie, and I didn't even know it... clever huh?)

please, please, please - If you know of any slides/code/whatever not on here, then ping me on twitter or comment this Gist!

This gist will be updated as and when I find new information. So it's probably best not to fork it, or you'll miss the updates!

Monday June 16th

@retronym
retronym / config.scala
Last active May 9, 2018 05:47
Styles of config propagation: Manual, Implicits, DynamicVariable, Reader
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>
@mnadel
mnadel / DatabaseCallable.java
Last active May 18, 2018 13:43
Dropwizard + Hystrix + Hibernate
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.Callable;
/**
* A database session and transaction-aware Callable
*/
class DatabaseCallable<T> implements Callable<T>
@arschles
arschles / scalaConcurrentPatterns.scala
Last active August 23, 2018 15:00
examples of common concurrency patterns that you can achieve with the scala.concurrent package
import scala.concurrent._
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext.Implicits.global
import scala.util.Random
import java.util.{Timer, TimerTask}
object Util {
sealed trait BaseResponse
case class Response1(res: Int) extends BaseResponse
case class Response2(res: String) extends BaseResponse
@kevinwright
kevinwright / ThrottledExecutionContext.scala
Last active October 5, 2018 08:09
Limit number of futures running in parallel (now updated with seize/release implementations suggested by roland)
import java.util.concurrent.ConcurrentLinkedQueue
import java.util.concurrent.atomic.AtomicInteger
import scala.concurrent.ExecutionContext
import scala.util.control.NonFatal
import scala.annotation.tailrec
//inspired by https://gist.github.com/viktorklang/4552423
object ThrottledExecutionContext {
def apply(maxConcurrents: Int)(implicit context: ExecutionContext): ExecutionContext = {
@aphyr
aphyr / zfs-sync
Created February 7, 2015 05:42
Sync ZFS filesystems, incrementally if possible.
#!/usr/bin/env ruby
# Synchronizes ZFS filesystems.
#
# Takes three args: source pool, destination pool, and filesystem name.
#
# Syncs most recent snapshot of filesystem from source to destination pool,
# using incremental transfer if possible.
# Take a snapshot line from zfs list -t snapshot and emit a struct
@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
package com.rr.experiment
import org.specs2.ScalaCheck
import org.specs2.mutable._
import org.scalacheck._
import scalaz._
import scodec._