shinnya

%% This module implements f-Resilient ♦S failure detector described in
%% "Implementing the weakest failure detector for solving consensus
%% Mikel Larrea, Antonio Fernández Anta, Sergio Arévalo"
-module(failure_detector).

-behaviour(gen_statem).

%% API
-export([start_link/3,
         get_leader/0,

shinnya

Prologue

I wrote this answer on stackexchange, here: https://stackoverflow.com/posts/12597919/

It was wrongly deleted for containing "proprietary information" years later. I think that's bullshit so I am posting it here. Come at me.

The Question

Amazon is a SOA system with 100s of services (or so says Amazon Chief Technology Officer Werner Vogels). How do they handle build and release?

shinnya

use fibers::{sync::oneshot, time::timer};
use futures::{Async, Future, Poll, Select};
use futures::future::Either;
use std::marker::PhantomData;
use std::time::Duration;

// your custom error type.
use Error;

type BoxFuture<T, E> = Box<Future<Item = T, Error = E> + Send + 'static>;

shinnya

#!/usr/bin/env bash

CURL=curl
API_BASE=http://frugalos1

$CURL -X PUT -d '{"dispersed": {"id": "vod", "device":"root", "tolerable_faults": 1, "data_fragment_count": 2}}' $API_BASE/v1/buckets/vod

shinnya

/*
 * GTK - The GIMP Toolkit
 * Copyright (C) 2002 Owen Taylor
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,

shinnya

[Desktop Entry]
Version=1.0
Type=Application
Name=CLion
Icon=/opt/clion-2018.2.2/bin/clion.svg
Exec="/opt/clion-2018.2.2/bin/clion.sh" %f
Comment=The Drive to Develop
Categories=Development;IDE;
Terminal=false
StartupWMClass=jetbrains-clion

shinnya

2535-or-patterns -

Summary

パターンマッチ内で任意にネストした形式で |(or pattern) を使えるようにする。 記法は Some(A(0) | B(1 | 2)) のようになる。

以前は Some(A(0)) | Some(B(1)) | Some(B(2)) のように書かなければならなかった。

Motivation

shinnya

Original link: http://www.concentric.net/~Ttwang/tech/inthash.htm
Taken from: http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm
Reformatted using pandoc

Integer Hash Function

Thomas Wang, Jan 1997

last update Mar 2007

shinnya

#include <memory>
#include <string>
#include <iostream>

using namespace std;

template <typename K, typename V>
struct Node
{
  K key;

shinnya

(*
 * Tested in Poly/ML. To compile: `polyc thread.ml && ./a.out`
 *
 * Heavily influenced by: http://pages.cs.wisc.edu/~remzi/OSTEP/threads-cv.pdf
 * Poly/ML Thread documentation here: http://www.polyml.org/documentation/Reference/Threads.html
 * Poly/ML Thread implementation here: https://github.com/polyml/polyml/blob/master/basis/Thread.sml
 *)

val done = ref false;
val m = Thread.Mutex.mutex();