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#Node.js and the Event Loop

Node.js is a framework for writing server-side JavaScript applications. It is built on top of the V8 JavaScript runtime and uses an event-driven, non-blocking I/O model that makes it perfectly suited for data-intensive real-time applications.

This blog post will describe what non-blocking I/O means and how working with the event loop can help your applications be more efficient.

##The Restaurant

"This [non-blocking I/O] model simplifies access to slow resources in a scalable way that is intuitive to JavaScript programmers and easy to learn for everyone else." - Node Up and Running.

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desc 'import from WordPress XML file'
task :import_from_wp => :environment do
  require 'hpricot' 

  doc = Hpricot::XML(File.read('wp-export-file.xml'))

  posts = (doc/:channel/:item)
  posts.each do |post|
    p "Post: #{post.at('link').inner_text}"
  end

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class SomeClass

  def some_method(obj)
    if obj.foo
      obj.bar
    end
  end
end

class SomeOtherClass

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class FooError < StandardError
end

begin
  p "about to raise Foo.."
  raise FooError.new
rescue FooError
  p 'rescues from Foo'
  begin
    p 'about to raise Meh..'

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FROM alpine:latest

# 01- ENV set directly in Dockerfile.
# Available during BUILDTIME and RUNTIME.
ENV LOCAL_ENV="hi I am LOCAL_ENV"
RUN echo $LOCAL_ENV

# 02 - ARG sent via command (docker or docker-compose)
# Available during BUILDTIME only.
ARG BUILDTIME_ENV

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defmodule GuitarStore.Repo.Migrations.AddIsCustomShopToGuitars do
  use Ecto.Migration

  def change do
    alter table("guitars") do
      add :is_custom_shop, :boolean, default: false
    end

    create index("guitars", ["is_custom_shop"])
  end

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{
  "agent": {
    "metrics_collection_interval": 60,
    "run_as_user": "root"
  },
  "metrics": {
    "append_dimensions": {
      "ImageId": "${aws:ImageId}",
      "InstanceId": "${aws:InstanceId}",
      "InstanceType": "${aws:InstanceType}"

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Ruby 1.9.0.0 compile error (openssl problem)

TAGS: None

Found these error:

view sourceprint?
compiling openssl
gcc -I. -I../../.ext/include/i686-darwin10.2.0 -I../.././include -I../.././ext/openssl -DRUBY_EXTCONF_H=\"extconf.h\"    -fno-common -g -O2 -pipe -fno-common   -o openssl_missing.o -c openssl_missing.c
In file included from openssl_missing.c:22:

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[Unit]
Description=O Nome do Service

[Service]
Type=notify
ExecStart=/bin/pra/iniciar/o/service
WatchdogSec=30s
Restart=always
RestartSec=5

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#!/bin/bash -xe
yum update -y
amazon-linux-extras install nginx1 -y
cd /usr/share/nginx/html
echo "WebServer on instance-id " > index.html
curl http://169.254.169.254/latest/meta-data/instance-id >> index.html
systemctl start nginx