Lukas-Krickl

Project Reactor: From Zero to Hero

In this series of pages, I will discuss project reactor and reactive programming from basic concepts to reactor internal implementation details. This discussion is based on the official reference documentation, the java-doc, talks by maintainers of reactor e.g. at the spring I/O and other distributed material, and should summarise and connect all this information. It should complement the official reference documentation and java-doc. Although the name says "from zero to hero", basic knowledge about the library is advised to fully benefit from it.

As a short disclaimer, I am a professional software engineer with some years of experience in using reactor, but not a maintainer or creator of the library. Information and knowledge in this post are based on the official documentation and talks, but I cannot exclude misconceptions on my side.

---

1. [Why and when to use Reactor](https://gist.github.com/Lukas-Krickl/50f1daebebaa72c7e944b7c319e3c073#file-01-why-and-when-to-use

pietrocolombo

# delete_duplicate_file.py
# Python 3.8.6

"""
Given a folder, walk through all files within the folder and subfolders
and delete all file that are duplicates so you have only one copy of every file
The md5 checcksum for each file will determine the duplicates
"""

import os

ityonemo

A half-hour to learn Zig

This is inspired by https://fasterthanli.me/blog/2020/a-half-hour-to-learn-rust/

Basics

the command zig run my_code.zig will compile and immediately run your Zig program. Each of these cells contains a zig program that you can try to run (some of them contain compile-time errors that you can comment out to play with)

kendru

pub trait Visitable {
    fn accept<V: Visitor>(&self, visitor: &mut V) -> V::Result;
}

pub trait Visitor {
    type Result;

    fn visit_num(&mut self, num: &Num) -> Self::Result;

    fn visit_add<T, U>(&mut self, add: &Add<T, U>) -> Self::Result

azanium

ssh-keygen -t rsa -b 4096 -e SHA512 -f jwtRS512.key
# Don't add passphrase
openssl rsa -in jwtRS512.key -pubout -outform PEM -out jwtRS512.key.pub
cat jwtRS512.key
cat jwtRS512.key.pub

rponte

--
-- splitting as columns
--
select regexp_substr('a-b-c', '[^-]+', 1, 1) as grupo_1
      ,regexp_substr('a-b-c', '[^-]+', 1, 2) as grupo_2
      ,regexp_substr('a-b-c', '[^-]+', 1, 3) as grupo_3
  from dual;
  
-- result:
-- a b c

roblogic

MSYS2 is a minimalist linux/unix shell environment for Windows.

Quote: "A modern replacement for MSYS bringing recent versions of the GNU toolchains, Git and other common Unix command line tools to the Windows platform"

1. Install

Do all the steps listed here: http://msys2.github.io/
(troubleshooting guide here: https://github.com/msys2/msys2/wiki/MSYS2-installation )

2. Set up proxies

telekosmos

var uniqueArray = function(arrArg) {
  return arrArg.filter(function(elem, pos,arr) {
    return arr.indexOf(elem) == pos;
  });
};

var uniqEs6 = (arrArg) => {
  return arrArg.filter((elem, pos, arr) => {
    return arr.indexOf(elem) == pos;
  });

thomasdarimont

package demo;

import static java.lang.reflect.Modifier.*;

import java.util.Arrays;
import java.util.Set;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanExpressionResolver;

shingonoide

building '_imagingft' extension

gcc -pthread -fno-strict-aliasing -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -DNDEBUG -march=x86-64 -mtune=generic -O2 -pipe -fstack-protecto
r --param=ssp-buffer-size=4 -fPIC -I/usr/include/freetype2 -IlibImaging -I/home/cafeerp/instances/cafeerp_ocb7/include -I/usr/local/include -I/usr/include -I/usr/include/python2.7 -
c _imagingft.c -o build/temp.linux-x86_64-2.7/_imagingft.o

_imagingft.c:73:31: fatal error: freetype/fterrors.h: No such file or directory

 #include <freetype/fterrors.h>