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resource "digitalocean_droplet" "kafka" {
    image = "ubuntu-14-04-x64"
    name = "${var.machine_name}"
    region = "nyc2"
    size = "4gb"
    private_networking = true
    ssh_keys = [
      "${var.ssh_fingerprint}"
    ]

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#!/bin/bash -e
clear
echo "============================================"
echo "WordPress Install Script"
echo "============================================"
echo "Database Name: "
read -e dbname
echo "Database User: "
read -e dbuser
echo "Database Password: "

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<script src="https://raw.github.com/mbostock/d3/master/d3.js"></script>
<script src="https://raw.github.com/mbostock/d3/master/d3.layout.js"></script>
<div id="area"></div>
<style>
#area { background: #eee; width: 600px; height: 400px; }
circle { fill: #933; stroke-width: 2px; stroke: #fff; }
</style>
<script>
var canvas = d3.select("#area")
    .append("svg:svg")

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From the D3 documentation:

Enclosure diagrams use containment (nesting) to represent the hierarchy. The size of each leaf node’s circle reveals a quantitative dimension of each data point. The enclosing circles show the approximate cumulative size of each subtree, but note that because of wasted space there is some distortion between levels; only the leaf nodes can be compared accurately. Although circle packing does not use space as efficiently as a treemap, the “wasted” space more prominently reveals the hierarchy.

Featured on D3plus.org

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// https://akarnokd.blogspot.ru/2017/09/rxjava-vs-kotlin-coroutines-quick-look.html
import kotlinx.coroutines.experimental.*

suspend fun f1(i: Int): Int {
    Thread.sleep(if (i != 2) 2000L else 200L)
    return 1
}

suspend fun f2(i: Int): Int {
    Thread.sleep(if (i != 2) 2000L else 200L)

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Rough Notes about CQRS and ES

Once upon a time…

I once took notes (almost sentence by sentence with not much editing) about the architectural design concepts - Command and Query Responsibility Segregation (CQRS) and Event Sourcing (ES) - from a presentation of Greg Young and published it as a gist (with the times when a given sentence was heard).

I then found other summaries of the talk and the gist has since been growing up. See the revisions to know the changes and where they came from (aka the sources).

It seems inevitable to throw Domain Driven Design (DDD) in to the mix.

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#HTML presentation tools

There are many HTML presentation tools and they are all created for slightly different reasons. Here's an overview. Please let me know if I forgot any.

##CSSS

CSS-based SlideShow System

• Source
• Example

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function go() {
  var userId = prompt('Username?', 'Guest');
  checkIfUserExists(userId);
}

var USERS_LOCATION = 'https://SampleChat.firebaseIO-demo.com/users';

function userExistsCallback(userId, exists) {
  if (exists) {
    alert('user ' + userId + ' exists!');

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using System;

namespace Example
{
    public abstract class ExecutionResult
    {
        protected ExecutionResult(Guid aggregateId, Guid commandId, DateTime executedOn)
        {
            AggregateId = aggregateId;
            CommandId = commandId;

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Install php7.0-fpm

# remove php5 modules
apt-get autoremove --purge php5-*
# add php-7.0 source list by [Ondřej Surý](https://github.com/oerdnj)
add-apt-repository ppa:ondrej/php
# Update index
apt-get update
# Install php7.0-fpm with needed extensions