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xwininfo

ffmpeg -video_size ${w}x${height} -framerate 12 -f x11grab -i :0.0+${x},${y} output/%04d.png

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#!/bin/sh

# converts IPv4 as "A.B.C.D" to integer
# ip4_to_int 192.168.0.1
# => 3232235521
ip4_to_int() {
  IFS=. read -r i j k l <<EOF
$1
EOF
  echo $(( (i << 24) + (j << 16) + (k << 8) + l ))

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#!/bin/sh

ID=$(uuidgen)
LEADER_KEY="localhost:2379/v2/keys/master"
TTL=5
INTERVAL=1

i_am_leader() {
  echo "I am leader";
  while true; do

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bootstrap.servers

A list of host/port pairs to use for establishing the initial connection to the Kafka cluster. The client will make use of all servers irrespective of which servers are specified here for bootstrapping—this list only impacts the initial hosts used to discover the full set of servers. This list should be in the form host1:port1,host2:port2,.... Since these servers are just used for the initial connection to discover the full cluster membership (which may change dynamically), this list need not contain the full set of servers (you may want more than one, though, in case a server is down).

key.deserializer

Deserializer class for key that implements the Deserializer interface.

value.deserializer

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# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|

  (1..2).each do |n|
    config.vm.define "ap-#{n}" do |node|
      node.vm.provider "docker" do |docker|
        docker.build_dir = "vanilla"    
        docker.expose = [8000, 12201]   

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#!/usr/bin/env ruby

utsname = []
topic = []

if ARGV.length < 1
  STDERR.puts("Missing arguments")
  exit 1
end

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var page = require('webpage').create();
page.open('http://www.tamagoya.co.jp/menu_list.html', function() {
  var rect = page.evaluate(function() {
    var menuDate = Array.prototype.find.call(
      document.querySelectorAll('.menutitle_date'),
      (e) => e.textContent.includes("26") );
    var menuTitle = menu_date.parentElement;
    var menuList = menuTitle.nextElementSibling
    var menuBottom = menuList.nextElementSibling

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     April 2017     
Su Mo Tu We Th Fr Sa
                   1 
 2  3  4  5  6  7  8 
 9 10 11 12 13 14 15 
16 17 18 19 20 21 22 
23 24 25 26 27 28 29 
30                   

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Benchmark commands

Producer

Setup

bin/kafka-topics.sh \
  --zookeeper zookeeper.example.com:2181 \
  --create \

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String synchronizedHeavyMethod(Duration timeout) throws TimeoutException {
    Instant deadline = Instant.now().plus(timeout);
    while (Instant.now().isBefore(deadline)) {
        // doSomething() resutrns nullable String
        String result = doSomething();
        if (Objects.isNull(result)) {
            continue;
        }
        return result;
    }