Nikolay Mishin mishin

Compare application properties files in Groovy

This script below allows you to compare properties files between environments.

If you maintain your application's externalised properties file in a seperate repository with a structure similar to below, you can use this to compare properties file between different environment.

compare-properties.groovy
|- src
|	|- main
|	|	|- resources

Dynamic Configuration Properties in Spring Boot and Spring Cloud

TL;DR

Use @ConfigurationProperties and always get state from the bean.
The Environment can change at runtime and Spring Cloud does this for you using RefreshEvent.
Changes are propagated to beans in Spring Cloud in 2 ways (@ConfigurationProperties and @RefreshScope).
If you care about the state of @ConfigurationProperties being consistent on concurrent access, put it or the consumer @Bean in @RefreshScope.

Typical Scenarios

From time to time, Musk will send out an e-mail to the entire company to enforce a new policy or let them know about something that's bothering him. One of the more famous e-mails arrived in May 2010 with the subject line: Acronyms Seriously Suck:

There is a creeping tendency to use made up acronyms at SpaceX. Excessive use of made up acronyms is a significant impediment to communication and keeping communication good as we grow is incredibly important. Individually, a few acronyms here and there may not seem so bad, but if a thousand people are making these up, over time the result will be a huge glossary that we have to issue to new employees. No one can actually remember all these acronyms and people don't want to seem dumb in a meeting, so they just sit there in ignorance. This is particularly tough on new employees.

That needs to stop immediately or I will take drastic action - I have given enough warning over the years. Unless an acronym is approved by me, it should not enter the SpaceX glossary.

	import string
	from pprint import pprint

	import gspread
	from gspread import Cell, Client, Spreadsheet, Worksheet
	from gspread.utils import rowcol_to_a1
	import requests

	SPREADSHEET_URL = "https://docs.google.com/spreadsheets/d/.../"

	program="BEGIN{prev = \"\"} \
	\
	/^# file: / {\
	prev = substr(\$0, 9)\
	}\
	\
	/$2/ {\
	print prev;\
	prev=\"\"\
	}\

	plugins {
	id 'org.hidetake.ssh' version '2.9.0'
	id 'org.jetbrains.kotlin.jvm' version '1.3.11'
	id 'org.springframework.boot' version '2.1.2.RELEASE'
	id 'io.spring.dependency-management' version "1.0.6.RELEASE"
	}

	group 'App Group'
	version '1.0.0'

	function logColor(color, args) {
	console.log(`%c ${args.join(' ')}`, `color: ${color}`);
	}

	const log = {
	aliceblue: (...args) => { logColor('aliceblue', args)},
	antiquewhite: (...args) => { logColor('antiquewhite', args)},
	aqua: (...args) => { logColor('aqua', args)},
	aquamarine: (...args) => { logColor('aquamarine', args)},
	azure: (...args) => { logColor('azure', args)},

	@startuml
	skinparam lifelineStrategy solid
	skinparam handwritten false
	skinparam monochrome true
	skinparam packageStyle rect
	skinparam defaultFontName FG Virgil
	skinparam shadowing true
	skinparam classBorderThickness .5
	skinparam usecaseBorderThickness .5
	skinparam titleBorderRoundCorner 15

	#!/usr/bin/perl
	use v5.14;

	my $input_string;

	say "Hello! Input string as \"x + y\" or \"sin x\" \n";
	say 'You can use "+", "-", "", "\", "*", "sin", "cos", "tan"';
	$input_string = <STDIN>;
	my ($first_arg, $second_arg, $third_arg) = split ' ', $input_string;