wsargent

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

• http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

• Does the design expect failures to happen regularly and handle them gracefully?
• Have we kept things as simple as possible?

wsargent

"play-dev-mode-akka.actor.default-dispatcher-3@12379" prio=5 tid=0x4c nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 waiting for application-akka.actor.default-dispatcher-5@17283 to release lock on <0x473f> (a play.core.server.DevServerStart$$anon$1)
	  at play.core.server.DevServerStart$$anon$1.get(DevServerStart.scala:122)
	  at play.core.server.AkkaHttpServer.modelConversion(AkkaHttpServer.scala:184)
	  at play.core.server.AkkaHttpServer.handleRequest(AkkaHttpServer.scala:190)
	  at play.core.server.AkkaHttpServer.$anonfun$createServerBinding$3(AkkaHttpServer.scala:107)
	  at play.core.server.AkkaHttpServer$$Lambda$383.1818878724.apply(Unknown Source:-1)
	  at akka.stream.impl.fusing.MapAsync$$anon$23.onPush(Ops.scala:1172)
	  at akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:499)

wsargent

Install Coursier

https://github.com/coursier/coursier#command-line-1

Add the following functions to your shell

Generate a read-only, personal access token for GitHub.

export GITHUB_TOKEN=XXXXXXX

wsargent

[error] com.typesafe.play#sbt-plugin;2.6.0-SNAPSHOT!sbt-plugin.jar origin location must be absolute: C:\Users\wsargent\.ivy2\local\com.typesafe.play\sbt-plugin\scala_2.10\sbt_0.13\2.6.0-SNAPSHOT\jars\sbt-plugin.jar
java.lang.IllegalArgumentException: com.typesafe.play#sbt-plugin;2.6.0-SNAPSHOT!sbt-plugin.jar origin location must be absolute: C:\Users\wsargent\.ivy2\local\com.typesafe.play\sbt-plugin\scala_2.10\sbt_0.13\2.6.0-SNAPSHOT\jars\sbt-plugin.jar
        at org.apache.ivy.util.Checks.checkAbsolute(Checks.java:57)
        at org.apache.ivy.core.cache.DefaultRepositoryCacheManager.getArchiveFileInCache(DefaultRepositoryCacheManager.java:387)
        at org.apache.ivy.core.cache.DefaultRepositoryCacheManager.download(DefaultRepositoryCacheManager.java:851)
        at org.apache.ivy.plugins.resolver.BasicResolver.download(BasicResolver.java:835)
        at org.apache.ivy.plugins.resolver.RepositoryResolver.download(RepositoryResolver.java:282)
        at org.apache.ivy.core.resolve.ResolveEngine.downloadAr

wsargent

export DEFAULT_USER=wsargent

source $HOME/.antigen/antigen.zsh

# Load the oh-my-zsh's library.
antigen use oh-my-zsh

# Bundles from the default repo (robbyrussell's oh-my-zsh).
antigen bundle git
antigen bundle pip

wsargent

# Usage: gh-clone lagom lagom to checkout lagom/lagom
function gh-clone() {
  OWNERNAME=$1;
  PROJNAME=$2;
  cd $WORKDIR;
  mkdir $PROJNAME;
  cd $PROJNAME;
  hub init -g 
  hub clone $OWNERNAME/$PROJNAME master;
  cd master;

wsargent

package backend

import akka.actor.{Actor, ActorRef, Cancellable}

import scala.concurrent.duration.FiniteDuration
import scala.util.control.NoStackTrace

private case class SchedulerException(msg: String) extends akka.AkkaException(msg) with NoStackTrace

/**

wsargent

export WORKDIR=$HOME/work

# Creates a working tree to check out a branch locally.
# This is useful when you have multiple branches on origin,
# and want to pull work work with them
function worktree() {
  # We assume we're always under $WORKDIR somewhere.
  # Go down the tree until we know what project we're in.
  while [[ "$(dirname "$PWD")" != $WORKDIR ]] ; do
     find "$PWD"/ -maxdepth 1 "$@"

wsargent

I use Play 2.5.6 with Scala and found several interesting modules but I think some basic and really useful features are still missing...

Here is my sample app where I do my tests :

• messages
• messages.fr
• index.scala.html
• I18nHelper.scala

I list here needed features (according to me) from the most needed to the least needed.

wsargent

import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.util.Timeout;
import scala.compat.java8.FutureConverters;
import scala.concurrent.Future;

import java.util.concurrent.CompletionStage;
import java.util.concurrent.TimeUnit;

public class JavaActorLookup {