joelash

import React from 'react';

import {
  AppState,
} from 'react-native';

import Expo from 'expo';

class App extends React.Component {
  constructor(props) {

joelash

/**
 *  MQTT Bridge
 *
 *  Authors
 *   - st.john.johnson@gmail.com
 *   - jeremiah.wuenschel@gmail.com
 *   - asher.friedman@gmail.com
 *
 *  Copyright 2016
 *

joelash

;; Async Lifecycle

(defn lifecycle-channel [component]
  (let [tap-ch (async/chan)]
    (-> (.-lifecycleChannel component)
        :mult
        (async/tap tap-ch))
    tap-ch))

(defn with-lifecycle [klass]

joelash

(ns delay-chan
  (:require [clojure.core.async :refer [>! <! put! chan timeout go alts!]))

(defonce model-chan (chan))

(defn delay-chan
  "Take a channel to listen to and optional timeout. Returns a sleepy-chan
  Will only publish latest message on sleepy-chan once per timeout."
  [input-chan]
  (let [output-chan (chan)]

joelash

(ns cowboy
  (:import [javax.crypto Cipher SecretKey SecretKeyFactory]
           [javax.crypto.spec DESedeKeySpec IvParameterSpec]
           [org.apache.commons.codec.binary Base64 Hex]))

(def algo "DESede")
(def transformation "DESede/CBC/PKCS5Padding")

(defn bytes [s]
  (.getBytes s "UTF-8"))

joelash

Neo4j in general

• When store a join table structure in a graph database you just drop the join table and have a direct relationship
• Usually start with drawing the graph on a whiteboard and then work from there
• in general for speed want to avoid millions of relationships off of nodes, prefer lots of nodes over this. (But sometimes this is just necessary) (might be solved in 2.1)

Cypher

• Commenting on something has (person) -commented-> (comment) -on-> (thing)
• cypher is the sql like query language -> designed entirely for graphs with pattern matching for nodes and relationships
• node is a circle and relationship is an arrow, so query is like ascii art for this (a) --> (b)

joelash

#!/usr/bin/env bash
apt-get -y update
apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p125.tar.gz
tar -xvzf ruby-1.9.3-p125.tar.gz
cd ruby-1.9.3-p125/
./configure --prefix=/usr/local
make
make install

joelash

require 'pathname'
require 'digest'

`touch foo.txt`

path = Pathname.new 'foo.txt'
digest = Digest::MD5.new # digest type doesn't matter, see same problem with SHA1

digest.file path  # this line throws an error when have JRUBY_OPTS=--1.9

joelash

require "rubygems"
require "jretlang"

class Arnie
  def initialize
    @channel = JRL::Channel.new
    @consumer = JRL::Fiber.new
  end

  def start