LEDIANO, Bespielen eines Piano-LED-Streifens
LEDIANO ist eine Software, die über einen Raspberry Pi eine LED-Leiste steuert, um die Koordination von Motorik und Gehör zu fördern, indem die zu spielenden Klaviertasten durch das Aufleuchten der entsprechenden LEDs angezeigt werden.
Computer Archeology: Exploring the Anatomy of an MS-DOS Virus
Unveiling a highly idiosyncratic 1990s hackers’ malware creation time capsule, along with an analysis of their intuitive anticipation of modern programming techniques …
CRACKZIP manpage
Recovery tool for cracking password protected ZIP (*.zip) files …
FLATML manpage
A shell filter flattening markup properties of XML, JSON, YAML, INI or PROPERTIES format to key/value lines …
Short-Term effects and Long-Term impacts of AI and Machine Learning
Reasoning upon the current rise of AI and Machine Learning, I scribbled down some thoughts regarding the Short-Term effects and Long-Term impacts of AI and had GPT-4 render my input into a blog post (statements 2. or 3. may apply to this article) …
Yet another AI cheat sheet
As AI continues to evolve, I sat down to prepare a structured overview of this topic for me to the have some cheat sheet for looking up related terms and definitions quickly …
Yet another VI(M) cheat sheet
The ACNS Bulletin ED–0 «vi Editor “Cheat Sheet”» from the University at Albany, updated with some copy’n’ paste hints and visual modes outlined (as I tend to forget how to invoke the most essential vi functionality) …
refcodes-rest: RESTful services using lambdas
Build a RESTful lightweight service with just a few lines of code in three steps using lambda expressions.
refcodes-decoupling: Breaking up dependencies between components
Tiny dependency injection and inversion of control toolkit to assemble applications whilst developing and testing components independently …
Yet another Big-O cheat sheet
Unlock the algorithmic secrets with this Big-O Notation cheat sheet, decoding runtime behaviors in a sentence …
refcodes-archetype: Using the REFCODES.ORG toolkit made easy
Use the REFCODES.ORG archetypes at Maven Central to easily create REFCODES.ORG driven applications …
Java Software Developer and IoT Programmer: Your Coding Architect
Before I forget to mention (though quite a few people seem already to know), I may help you with your software projects …
Write once, run anywhere: An Android game using JavaFX and the GraalVM
Get it into the Play Store! Writing an Android game with Java >= 16 and JavaFX (which also runs on GNU Linux and MS Windows using a single code base) …
refcodes-cli: Parse your args[]
Just about everything you’ll need to comfortably parse your Java command line arguments …
refcodes-io: Paving the road for complex and low level I/O across boundaries
The I/O artifact defines basic types handling communication between processes (across system boundaries), to be harnessed by complex and low level I/O …
GraalVM: Native command line tools for Linux and Windows written in Java
Thanks to the GraalVM, you may compile your Java command line tools to native executables, directly running on MS Windows or GNU Linux without any JVM being installed or bundled …
Java deliverables as executable bundle and the launcher trick
In the past I coded some command line tools in Java which are quite useful for me and which I ought to be useful for others. Providing just fat JAR files implies launching of those Java applications to be more or less cumbersome …
Yet another BASH cheat sheet
The tiny BASH Cheet Sheet provides you (me) with a more or less alphabetically sorted tool-box of the expressions I most commonly use and tend to forget …
Buchtipp: Spring for GraphQL
Reckoning the book »Spring for GraphQL« from Michael Schäfer very helpful, the Javamagazin 8/22 published an according book review I wrote …
PASSGEN manpage
A tool for generating password lists written into a file or printed to <STDOUT> by providing rule expressions …
refcodes-criteria: Criteria construction for selecting, filtering or identifying
Create query statements which can be applied to data sinks from criteria objects and parse (construct) criteria objects from queries …
refcodes-generator: Mass produce password permutations and distinct IDs
Use a rule based word permutations generator for recovering lost data or a fast ID generator for mass production of adjustable uniqueness …
Using TTY2MQTT to bridge between serial communication and MQTT
The TTY2MQTT command line tool is a bridge between TTY (COM) serial communication and an MQTT message broker easily harnessing your IoT devices into the Cloud.
refcodes-tabular: Process tabular data and CSV files using POJOs
Use the REFCODES.ORG archetypes at Maven Central to easily create REFCODES.ORG driven applications …
Better programs - Citations one should have heard of (2/2)
This is the second part of a two-part series on citations one should have heard of and why them make you a better programmer …
Better programs - Citations one should have heard of (1/2)
The last years I stumbled over notable citations and excerpts or even parodies and other bits and pieces which I regard should accompany good software engineers to produce better code …
refcodes-matcher: Build custom matching logic and match path patterns
Match your objects by building hierarchical matching structures with the help of some syntactical sugar (if you like) …
refcodes-serial: A serial communication toolkit for Java
Code serial communication at a high abstraction, addressing issues such CRC, endianess, acknowledgement or handshaking whilst keeping you full control over your bits and bytes …
JUG Munich - Automatically answer Teams chats with Java microservices
In January 2022 we were offered the opportunity to talk about automatically answering MS-Teams chats with Java microservices at the JUG (Java User Group) Munich (»Teams-Chats mit Java-Microservices automatisch beantworten«) …
refcodes-properties: Managing your application’s configuration
Compose the way you need to retrieve (and store) your application’s properties
PLAYLOAD manpage
Peer-to-Peer command line transport system for exchanging messages between peers over serial TTY (COM) ports …
IT-Tage 2021 - No WLAN, no LAN: Wiring IoT installations
In December ‘21, I was happy to have a slot as a speaker at the IT-Tage 2021, presenting my topic »No WLAN, no LAN: wiring IoT installations« …
ASCART manpage
A command line tool for creating ASCII art (“[ASC]II[ART]”) from plain text or image files …
BIN2TXT manpage
Encoding and decoding tool for BASE64 and related encodings/decodings from/to ASCII to/from binary …
Chaos-based encryption - revisited!
How to use the CHAOS command line tool to evaluate Chaos-based encryption alongside a comparison to the AES algorithm.
TELETYPE manpage
Teleprinter command line tool for sending data to and receiving data from TTY (serial) ports simultaneously.
HTTPECHO manpage
Small HTTP-Echo server echoing incoming HTTP-Requests back to the client and to the console …
AUTOCHAT manpage
ELIZA chatbot (by Joseph Weizenbaum) talking to you via RESTful services and an MS-Teams endpoint or on the console …
WATCHDOG manpage
Cellular automaton simulating a watchdog in a house using JavaFX …
PICDAT manpage
Tool for converting (raw) data to a pixmap image and extracting raw (pixmap) data from an image …
CHAOS manpage
Encryption and decryption tool of file or stream data using Chaos-based encryption …
TTY2MQTT manpage
Tool bridging between a serial port and an MQTT message broker for publishing or subscribing messages …
PIXGRID manpage
Tool for displaying a light bulb matrix rendering configurable scrolling and fading pixmaps (PNG, GIF or JPG) …
WAVES manpage
Tool to generate or pipe and filter (sound) waves for audio playback and export.
DADUM manpage
Tool for dumping mass data by pattern to files or streams …
Manpages online!
The manpages for the FUNCODES.CLUB commands are online now!
Autumn leaves, Terminate and Stay Resident!
In the year 1991, I coded a TSR program simulating the effect of the Cascade Virus (also known as the Herbstlaub Virus) as of my best imagination … now it turns out that it’s the Cascade Virus’ effect on speed!
Scrolling and fading video conferencing with PixGRID
The year 2020 was the year of video conferencing and remote meetings (“corona”) … how can you ease the situation of your colleagues when the meetings are getting boring?
Listings im Kilo-Pack: Die Dateien von heute
I was very proud when in October 1992 the computer magazine »DOS International« published a 1024 bytes short Turbo Pascal program I wrote …
Experimenting with sinusoids and overlaying waves
A small Java tool teams up with your shell’s pipes and filters to provide a curve functions experimentation box
refcodes-audio: Handle WAV files and line-out with just some I/O streams
Use I/O streams to generate and play your sound waves on your PC’s speaker or write them to a WAV file …
JavaFX checkerboard for fun and cellular automaton experiments
Doing some thinking on BoulderDash being a cellular automaton and programming a petri dish for board games …
Fun with cellular automatons, BoulderDash and the Watchdog!
The WATCHDOG artifact is some demo application featuring show-cases on cellular automatons being built with the REFCODES.ORG artifacts.
Java Profiler sponsored by JProfiler
As of today, REFCODES.ORG’s open source software is profiled with JProfiler thanks to ej-technologies’s OSS support initiative.
Coding Serbia 2019 - With swarm intelligence on Burglar Hunt
In May ‘19, I was happy to speak at the Coding Serbia 2019, presenting my topic »With swarm intelligence on Burglar Hunt« …
The mystery of three letter acronyms
Playing around with three letter acronyms (TLA) seems to have some history in computing. You’ll find them in SciFi movies or in the naming of some products.
Ed Post über JavaScript (3/3)
Ed Post im Interview: “Ist JS (k)eine General Purpose Sprache?” und viele Fragen zu JavaScript werden beantwortet.
Ed Post über JavaScript (2/3)
Ed Post im Interview: “Ist JS (k)eine General Purpose Sprache?” und viele Fragen zu JavaScript werden beantwortet.
Ed Post über JavaScript (1/3)
Ed Post im Interview: “Ist JS (k)eine General Purpose Sprache?” und viele Fragen zu JavaScript werden beantwortet …
IT-Tage 2018 - Experiences of an Enterprise Developer with IoT
In December ‘18, I was happy to have a slot as a speaker at the IT-Tage 2018, presenting my topic »Experiences of an Enterprise Developer with IoT« …
JVM-Con 2018 - With swarm intelligence on Burglar Hunt
In November ‘18, I was happy to have a slot as a speaker at the JVM-Con 2018, presenting my topic »With swarm intelligence on Burglar Hunt« …
refcodes-logger: Fancy runtime-logs and highly scalable cloud logging
How to log any kinds of structured data - including your runtime logs - into the cloud (NoSQL clusters) or your local fancy colorful and tidy formatted console …
Restful JShell … RestREPL your Java 9’s JShell!
Java 9’s JShell can not only be used as a command line tool, furthermore you can use it in your own Java application. Learn on how to harness the JShell by building a restful service around it.
All-in-one Java configuration properties at hand
Learn on how to use the all-in-one runtime configuration properties giving you all the power of the various configuration features with a single line of code …
Automatically obfuscate your Java application’s configuration
Secure your application’s sensitive properties (passwords, secrets or access keys) on your hosts, on a host-, user- and/or application-individual context, and learn on how to use the all-in-one runtime configuration properties …
Bare-Metal REST with just a few lines of code
On building slim RESTful services and REST clients without a Heavy-Weight framework doing magic in the background and with a little help from Java 8’s lambda expressions.
Are frameworks in software development without alternative?
Last year I was speaking about Java Frameworks at the JVM-Con 2017 in Cologne and recently, as a follow up, I put all which I was speaking about into an article …
The canonical model, an ace upon your sleeve
Learn how the canonical model pattern helps you harness a bag full of functioanlity whilst keeping your effort low (and making the bits and pieces fit together magically) …
Dead simple Java application configuration
Retrieve (and store!) your YAML, TOML, JSON, XML or whatever (profiled) properties from various locations, resources or folders, just as you need it!
JVM-Con 2017 in Cologne
This year I have been at the JVM-Con 2017 in Cologne as a speaker, the topic being »About sense and nonsense on extensive framework use« …
Coding Serbia 2014 in Novi Sad - Big data processing the lean way
Talking about »Big data processing the lean way - a case study« at the Coding Serbia 2014 conference in Novi Sad …
Base! How low can you go? Base64, Base32, Base16, …
Just for fun I implemented a Base64 codec while replacing some utility classes (and third party dependencies) with builders …
Of software development methodologies, teams and individuals
Whilst pushing new methodologies into a software development team, one should understand the difference between methodologies of team relevance and of individual taste …
No more Mr. Nice Guy, no more code reviews!!!
No more code reviews, Mr. Nice Guy! Did you ever spend more than one second on thinking about WHO has to use your code’s INTERFACES ?!? Go away code review, I want good interfaces …
Yet another REST cheat sheet
I believe that good interfaces are even more important than good code. Refactoring a bad interface bears far-reaching implications effecting the interface implementation(s) as well as all the interface consumers …
The utility-builder pattern
Combining a utility class’s functionality with the builder pattern, add some spicy properties to it, and here comes the utility-builder pattern. Let’s try a definition …
Good bye utility classes, here come builders (1/2)
This first part of a two parts series on builders is on using the builder pattern for creating formatted text tables to your console…
Good bye utility classes, here come builders (2/2)
Part 2 on builders being a real alternative to utility classes, this time on doing ASCII art with a builder versus a utility class …
Off topic summertime workshops
Summer break is over and I wasn’t lazy … trying to get an electrified flight plane into the air and refurbishing an old Merkur VISION arcade cabinet …
Lambda up your jobs asynchronously!
Java 8’s lambda support has been added to the refcodes-jobbus as of version 1.0.0-SNAPSHOT …
Java 8: Obliged to do the Optional … or is it optional?
There seems to be some uncertainty on how to use the Optional class provided by Java 8 - I disect an example to get closer to an answer …
Get your jobs executed asynchronously - anywhere!
Lately, asynchronous (distributed) execution of jobs experiences some revival, be it as of technical constraints or as of leveraging big data processing …
refcodes-jobbus: Asynchronous job execution
Push your jobs onto the job-bus, let the job-bus execute your jobs asynchronously and grab the results later on - don’t bother with where (local or remote) your jobs are being executed …
refcodes-security: Chaos-based encryption as JCE (and without)
Chaos-based encryption is easy to implement and easy to be attached to the Java Cryptographic Extension (JCE) …
refcodes-eventbus: Observer + Publish/Subscribe = Message broker
Decoupling and channeling your asynchronous publish/subscribe message broker communication with the refcodes-eventbus …
Verschlüsselung im Chaos (Chaos-based encryption)
This text I received in the late 1980s in Harare (Zimbabwe ) from the mathematician Sönke Rehder; back then as a pupil I coded the herein described algorithm in BASIC on an Atari 600XL …
Publish … subscribe … observe … event-bus?
Lately some colleagues and me were reasoning on how to do client-side communication between web-page components … with Java I recommend taking a look at the refcodes-eventbus …
Having fun with the command pattern
Doing an undo in your apps and how you prepare your methods to be called later …
refcodes-command: Do the undo
Ever wondered how to easily implement and extend your application’s undo functionality?
refcodes-remoting: Face-to-face lightweight remote method calls
Publish your Java object on your server; connect to it on your client; use it on your client as if you were using it on the server … curious?
Logging like the nerds log
An introduction to the refcodes-logger framework; let’s start with giving your logs some color and tidy them up! Then let’s take over spring-boot’s log output …
Hello REFCODES.ORG!
My blog to accompany my org.refcodes Java based Maven artifacts
refcodes-forwardsecrecy: High encryption throughput
Encrypt with the security of asymmetric- and the throughput of symmetric encryption (in the cloud) …