mufid

Mufid's Private Bookmark

Tech Related

• http://news.ycombinator.com

Scalability

• (nanti)

nickboyce

# courtesy of juliocapote (http://news.ycombinator.com/item?id=485423)
def generate_code(len = 5)
  (1..len).map { (("a".."z").to_a + ("A".."Z").to_a + (0..9).to_a)[rand(62)] }.join
end

mufid

#!/bin/bash

for i in {1..116}
do
  if=`printf %03d $i`
  echo "Now downloading surat $if"
  sleep 1
  curl -LO "http://download.quranicaudio.com/quran/mishaari_raashid_al_3afaasee/$if.mp3"
done

jcasimir

Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

toddwschneider

# you can make a text file of request times (in ms, one number per line) and import it here, or you can use a probability distribution to simulate request times (see below where setting req_durations_in_ms)
# rq = read.table("~/Downloads/request_times.txt", header=FALSE)$V1

# argument notes:
# parallel_router_count is only relevant if router_mode is set to "intelligent"
# choice_of_two, power_of_two, and unicorn_workers_per_dyno are only relevant if router_mode is set to "naive"
# you can only select one of choice_of_two, power_of_two, and unicorn_workers_per_dyno

run_simulation = function(router_mode = "naive",
                          reqs_per_minute = 9000,

grantslatton

import urllib2
import re
import sys
from collections import defaultdict
from random import random

"""
PLEASE DO NOT RUN THIS QUOTED CODE FOR THE SAKE OF daemonology's SERVER, IT IS 
NOT MY SERVER AND I FEEL BAD FOR ABUSING IT. JUST GET THE RESULTS OF THE 
CRAWL HERE: http://pastebin.com/raw.php?i=nqpsnTtW AND SAVE THEM TO "archive.txt"

sjl

var empty_list = function(selector) {
    return selector(undefined, undefined, true);
};

var prepend = function(el, list) {
    return function(selector) {
        return selector(el, list, false);
    };
};
var head = function(list) {

dhh

Hi David,
I came across your profile online and wanted to reach out about Development
Opportunities here at Groupon. The company is growing, and we're always
looking for folks with solid skills that can make positive contribution to
our continued success. Any chance you'd be open to a quick conversation
about opportunities, or for any possible networking potential? If so, let me
know when you're free and we can set up a time to chat. Also, if you are
interested, it would be great if you could forward a current resume over
that I can take a look at. I look forward to hearing back from you! Please
let me know if you have any questions.

rootkea

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */
#endif

CMCDragonkai

#!/usr/bin/env bash

# this can be useful when developing against a custom DNS server, or 
# for example, if you made a change to the DNS settings of a domain, and you 
# know the authoritative nameserver IP address for a domain, you could use this 
# to bypass the intermediate DNS cache, and apply an HTTP request using the new 
# DNS settings supplied by your specified (authoritative) nameserver

curl --dns-servers <DNSIP,DNSIP> url.com