Nicolas Meylan nmeylan

PostgreSQL is Enough

Background and Cron Jobs

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

Download and install VirtualBox.
Download the CoreOS ISO
Create a new VM in VirtualBox
- For the OS, Other Linux, 64-bit should be fine
- Give the VM 1gb of memory, like your physical hardware has.
- Create a disk of whatever size you want. I made a VMDK file that could expand dynamically up to 8gb.
Mount the ISO in the VM
- Right click on the VM and click settings
Go to the storage tab

NERDTree

o.......Open files, directories and bookmarks....................|NERDTree-o|
go......Open selected file, but leave cursor in the NERDTree.....|NERDTree-go|
t.......Open selected node/bookmark in a new tab.................|NERDTree-t|
T.......Same as 't' but keep the focus on the current tab........|NERDTree-T|
i.......Open selected file in a split window.....................|NERDTree-i|
gi......Same as i, but leave the cursor on the NERDTree..........|NERDTree-gi|
s.......Open selected file in a new vsplit.......................|NERDTree-s|
gs......Same as s, but leave the cursor on the NERDTree..........|NERDTree-gs|

O.......Recursively open the selected directory..................|NERDTree-O|

	mines ubuntu 20.04 based, WSL2

	in windows
	wsl --list -v
	* Ubuntu-20.04 Stopped 2
	in wsl
	# the old update routine
	sudo apt-get update -y
	# add tools to build kernel, apologies if i missed anything as i already have a bunch of dev stuff setup
	sudo apt-get install -y autoconf bison build-essential flex libelf-dev libncurses-dev libssl-dev libtool libudev-dev

	package io.github.sandornemeth.spring;

	import java.util.Arrays;
	import java.util.stream.StreamSupport;

	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.context.event.ContextRefreshedEvent;
	import org.springframework.context.event.EventListener;
	import org.springframework.core.env.AbstractEnvironment;

	// Just before switching jobs:
	// Add one of these.
	// Preferably into the same commit where you do a large merge.
	//
	// This started as a tweet with a joke of "C++ pro-tip: #define private public",
	// and then it quickly escalated into more and more evil suggestions.
	// I've tried to capture interesting suggestions here.
	//
	// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
	// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,

	module RecognizePath
	def recognize_path(path, options)
	recognized_path = Rails.application.routes.recognize_path(path, options)

	# We have a route that catches everything and sends it to 'errors#not_found', you might
	# need to rescue ActionController::RoutingError
	return recognized_path unless recognized_path.slice(:controller, :action) == {controller: 'errors', action: 'not_found'}

	# The main app didn't recognize the path, try the engines...
	Rails.application.railties.engines.each do \|engine\|

	How to install Maven on Fedora, CentOS, Red Hat and Scientific Linux

	If you are using Fedora, CentOS, Red Hat or Scientific Linux sometimes yum does not have the package for the product you would like to install and Maven is one of them at the time of me writing this blog.

	I am going to show you how I install Maven on Fedora, CentOS, Red Hat or Scientific Linux you can do it the same way or find a better way.
	Download Maven and untar it.

	The first thing we need to do is to download the Maven tar file and untar it to a shared location on the workstation

	wget http://mirrors.gigenet.com/apache/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD