A Vision towards Observability in Practice
9 min
One of the key trends in software infrastructure in 2019 is Observability.
It has gained a lot of attention recently.
It has gained a lot of attention recently.
SAP: What do you need to start learning SAPUI5?
3 min
Tutorial
Introduction
At the start of September 2018, some cool guys also joined our team, they are fresh from University and they are really hungry to learn how to design and develop amazing web apps with SAPUI5.
That’s why I’ve started to collects internally on the web some links in order to create “The perfect journey to become a SAPUI5 Ninja Developer”.
I’ve also started to write down some exercise (from easy to hard) in order to test what they’ve learned but I will share those in a second blog post as soon I’ve finished them.
Presentation
Hi everyone,
I'm Emanuele Ricci, a full-stack developer based in Lucca (a beautiful little city in Tuscany, Italy).
Since the last three years, I work full-time for Techedge Group, a big worldwide consultant company that is a partner with SAP. I usually work in projects related with SAPUI5, SCP, HANA and in my free time, I love to create content around the technology I use at work and in my personal projects outside SAP. Lately, I'm a little bit experimenting with Android after the release of SAP Fiori SDK for Android/iOS.
Configure the development environment for learning HTML, CSS, PHP in Windows
8 min
Tutorial
Configure the development environment for learning HTML, CSS, PHP in Windows.
(article is published on linkedin.com (Alexander Panov) )
Beginning programmers always ask the question, where to start learning about creating websites? Search on the Internet gives a lot of various information, but unfortunately only more confuses novice developers. Having more than 5 years of teaching experience, I have seen many times how students, making breaks in computer games and deciding to become web developers, tried to customize development environments. They began to sort out the programs for layout. They grabbed Sublime Text, Notepad ++, Visual Studio Code, NetBeans or PHPStorm. We tried to install on our local computer WAMP (stands for Windows, Apache, MySQL and PHP) platforms, such as Denver, Xampp, Open Server and many others. But since there is no systematic knowledge in the head of a novice developer, there is no experience of customization, it was rare for some of them to set up a convenient development environment, and whoever got it, understood that it became more difficult to play, since many additional programs, smoothness in the game.
This article was born because of explaining for many years to each student how to do everything correctly and conveniently.
Once again I want to say that we will set up a working environment in the Windows system to study the creation of sites in HTML, CSS and their links to PHP. We will call this computer working, so that beginning web developers get used to the idea that their computer is their source of income.
Begin
Startups’ mistakes and pitfalls at patenting their IP
5 min
Translation
Most startups are created by devotees who don’t really want to know about protecting their intellectual property. Often, this leads to unfortunate consequences. Here, I would like to give an overview of the most common errors — and how to avoid them.
Peter created an ingenious algorithm; there are no known analogues to that whatsoever. He fiercely codes a prototype and begins the commercialisation in Russia. He puts up a website, uploads a demo, does some exhibitions. Gains momentum and taps into the US market. And here we go…
Nuts and bolts
Patent is a document of title to:
• the exclusive right to,
• authorship and
• priority of an —
— invention,
— utility model, or
— industrial design.
Invention, in its essence, is a technical solution expressed in the combination of essential features — that are sufficient for achieving the technical result.
Essential features are those affecting the achievability of the technical result — or, in other words, are in a cause-and-effect relation with the result.
Technical result is a trait of the technical effect, event, property, etc. that effectively appear in the exercise of the method, or in the production or use of the product, including in the use of the product produced directly by the method, of invention.
Patent claim defines the scope of protection of the patent, as it comprises the combination of essential features — that are sufficient for achieving the technical result.
Error 1 — The lack of protection
Peter created an ingenious algorithm; there are no known analogues to that whatsoever. He fiercely codes a prototype and begins the commercialisation in Russia. He puts up a website, uploads a demo, does some exhibitions. Gains momentum and taps into the US market. And here we go…
Modes are vim’s killer feature? Seriously?
5 min
Translation
Author of the original post in Russian: varanio
You may have read a recent article suggesting that vim is great unlike IDEs, because of their allegedly low typing speed.
Let’s recall that the main message of that article was that vim’s killer feature consists in its modes that sort of outshine everything else. That said, the author acknowledged that IntelliJ IDEA and other IDEs provide hotkeys and other user experience which can be easily used. However, since they lack modes, vim is supposed to be everyone’s first choice.
The author then suggests that instead of pressing
I know that articles that criticize vim get many negative votes, but I just have to speak out.
You may have read a recent article suggesting that vim is great unlike IDEs, because of their allegedly low typing speed.
Let’s recall that the main message of that article was that vim’s killer feature consists in its modes that sort of outshine everything else. That said, the author acknowledged that IntelliJ IDEA and other IDEs provide hotkeys and other user experience which can be easily used. However, since they lack modes, vim is supposed to be everyone’s first choice.
The author then suggests that instead of pressing
ctrl+arrows to move between words, it is easier to press Esc, e and then go back to the i editing mode. Understandably, all this trouble because the author finds it inconvenient to hold ctrl.I know that articles that criticize vim get many negative votes, but I just have to speak out.
Postgres Pro TDE — security and performance
Medium
14 min
Review
Translation
TDE comes in many flavors — from encryption at the TAM level to full-cluster encryption and tablespace markers. We take a close look at Percona, Cybertec/EDB, Pangolin/Fujitsu, and show where you lose performance and reliability, and where you gain flexibility.
On top of that, Vasily Bernstein, Deputy head of product development, and Vladimir Abramov, senior security engineer, will share how Postgres Pro Enterprise implements key rotation without rewriting entire tables — and why AES-GCM was the clear choice.
Energomera CE6806P: Bridging Analog and Digital in Energy Metering
Medium
10 min
Review
How did engineers in the past manage to measure electrical power without modern microchips and DSPs? This article explores the Energomera CE6806P, a device created in 2006 for verifying electricity meters, yet built using 1980s-era technology.
We’ll take a closer look at its design, principles of operation, and how discrete-analog solutions were used to achieve high accuracy. The Energomera is a fascinating example of engineering and ingenuity, giving us a unique perspective on the evolution of electrical measurement devices.
Harnessing the Power of Machine Learning in Fraud Prevention
Medium
6 min
Opinion
Picture this: A thriving e-commerce platform faces a constant battle against fake reviews that skew product ratings and mislead customers. In response, the company employs cutting-edge algorithms to detect and prevent fraudulent activities. Solutions like these are crucial in the modern digital landscape, safeguarding businesses from financial losses and ensuring a seamless consumer experience.
The industry has relied on rules-based systems to detect fraud for decades. They remain a vital tool in scenarios where continuous collecting of a training sample is challenging, as retraining methods and metrics can be difficult. However, machine learning outperforms rules-based systems in detecting and identifying attacks when an ongoing training sample is available.
With advancements in machine learning, fraud detection systems have become more efficient, accurate, and adaptable. In this article, I will review several ML methods for preventing fraudulent activities and discuss their weaknesses and advantages.
An Unexpected Article About Our Unicorn: Who Is the PVS-Studio Mascot?
5 min
PVS-Studio has a mascot that became inseparable from the brand - a unicorn. Lately we've been getting many questions about our magic steed: why the unicorn, why has he changed so much, does he have hooves, how come he doesn't wear pants, and how do we draw him. The answers are finally here, in this very article.
Attention: there will be a lot of pictures. And I mean A LOT.
NTFS Reparse Points
8 min
Translation
Hi, Habr. Here I have prepared for you a small guide about NTFS Reparse points (hereinafter RP). This article is for those who are just starting to dive into the Windows kernel drivers development. In the beginning, I will explain the theory with examples, then I will give an interesting task to solve.
IntelliJ IDEA: Structural Search and Replace
11 min
Tutorial
Translation
Modern IDEs are very powerful tools that can help developers in all kinds of situations. Unfortunately, much of this power is often lost because many functions remain unknown to developers, hiding in the shadows.
Simple example of the one of the such functions
Did you know that when you press F2 in IntelliJ IDEA, the cursor will jump to the nearest error in the file? And in the absence of an error – to the nearest warning? It seems that this is a secret only a few people know about.
Structural search and replace is one such pair of features. They can be extremely useful in situations where a whole variety of other functions can’t quite get the job done.
In this post, I will present some of these situations and go beyond artificial cases by demonstrating examples of real code from two projects:
- 3D-engine for game development, jMonkeyEngine, which is an example of a big, interesting project.
- My own pet project, plantuml-native-image, where I experiment with compiling PlantUML into native executable code using GraalVM Native Image.
In fact, it is this second project that encouraged me to write this post but I’m getting ahead of myself. First things first...
Making a demo for NES — HEOHdemo
26 min
There is a lengthy history of computer arts festivals, also known as demo parties, held in Russia over the last quarter century. For decades, once in a while people from all over the country gather together to compete in their ingenuity at getting what was once deemed impossible out of the old or new computer hardware and mere bytes of code. A few leading annual events has been established in the early years. One of them, creatively named CAFe (an acronym for Computer Art FEstival), was held in Kazan from 1999 to 2003. It went under the radar since, making the way for the everlasting Chaos Constructions (1999 — now) and DiHalt (2005 — now). After so long hiatus, the last year CAFe made a loud comeback, returning in full glory — at least by the number of prods released, if not in the scale of the event itself. Presentation of the compo entries went far into the night, with the last demos being shown at 6 AM to the popping eyes of the few hardy ones. There was my demo, too, and this is the story of its making.
Install Powershell Module from Github Repository
2 min
Hi there!
The latest years Powershell started expansion to other platforms and now works on Windows, Linux, and MacOS (I even managed to start it on raspberry Pi Debian distro).
And nowadays the main way for installing modules is PowerShell Gallery but in some situations, it still convenient to install modules directly from the source (the main reason — the main PowerShell modules repo configured to MyGet or NugetServer).
And it can be painful to install Module from GitHub — you should download archive, find modules folder extract archive content and then copy module folder to the Powershell Profile directory.
Moreover — people like me don't want to create a separate repository for each module (yes, I like the Release-Flow approach) so download and extract only the modules you are like -it even more difficult.
The latest years Powershell started expansion to other platforms and now works on Windows, Linux, and MacOS (I even managed to start it on raspberry Pi Debian distro).
And nowadays the main way for installing modules is PowerShell Gallery but in some situations, it still convenient to install modules directly from the source (the main reason — the main PowerShell modules repo configured to MyGet or NugetServer).
And it can be painful to install Module from GitHub — you should download archive, find modules folder extract archive content and then copy module folder to the Powershell Profile directory.
Moreover — people like me don't want to create a separate repository for each module (yes, I like the Release-Flow approach) so download and extract only the modules you are like -it even more difficult.
AHURATUS Smart Home Voice Assistant
7 min
AHURATUS Smart Home Voice Assistant
Developed by Ehsan Shaghaei
Innopolis University
AHURATUS Scientific Club.
Introduction
AHURATUS Smart Home Voice Assistant is an IOT device developed in order to control other home devices by voice detection. Note: This device is made ONLY for academic purposes.
Approach
Description
"AHURATUS Smart Home Voice Assistant" uses an ARM Cortex-M3 process for running the instructions as well as several peripheral devices in order to decrease the complexity of data bus and RF-Circuit calculations.
Bill of Materials
Learn Bootstrap Fast With These 10 Helpful Tips
5 min
If you want to start your career in web development then learning Bootstrap is the way to go. Bootstrap is basically a framework used for front-end development of web apps. Its front-end component library is widely used to create interactive and responsive web apps and websites that we are used to today.
If you don’t already know, you must be wondering what responsive websites are? In simple terms, the responsiveness of a website means that when the size of the screen on which the website is being seen changes, the layout of the website responds to that and change. This makes the websites look good no matter what screen size it is being viewed on.
There are two ways you can use Bootstrap. You can either import the Bootstrap into your code or you can download a sample Bootstrap project and build your website on that.
Bootstrap uses a 12-column model for website display, which is called a Bootstrap grid. On this grid, you can define different breakpoints to layout different components like headings, paragraphs, and buttons to make your website look visually appealing. When the screen size scales down, the components on the grid change layout to fit the smaller screen. This means that viewing the same website looks great on a normal size screen of your laptop and a smaller screen of your smartphone.
Bootstrap has become one of the most popular front-end development frameworks today. If you are a beginner who wants to start learning Bootstrap then you are on the right blog. Because here are the top 10 tips to learn and master Bootstrap!
If you don’t already know, you must be wondering what responsive websites are? In simple terms, the responsiveness of a website means that when the size of the screen on which the website is being seen changes, the layout of the website responds to that and change. This makes the websites look good no matter what screen size it is being viewed on.
How does Bootstrap work?
There are two ways you can use Bootstrap. You can either import the Bootstrap into your code or you can download a sample Bootstrap project and build your website on that.
Bootstrap uses a 12-column model for website display, which is called a Bootstrap grid. On this grid, you can define different breakpoints to layout different components like headings, paragraphs, and buttons to make your website look visually appealing. When the screen size scales down, the components on the grid change layout to fit the smaller screen. This means that viewing the same website looks great on a normal size screen of your laptop and a smaller screen of your smartphone.
Bootstrap has become one of the most popular front-end development frameworks today. If you are a beginner who wants to start learning Bootstrap then you are on the right blog. Because here are the top 10 tips to learn and master Bootstrap!
10 Books on Agile Project Management Worth Taking With You in 2020
6 min
Translation
Books with the word «Agile» in their titles began to appear on the shelves of IT experts and other industries' professionals after 2001. The term was used during the declaration of the Agile Software Development Manifesto. Agile describes a software development methodology that is characterized by short life cycles leading to frequent product releases.
Today this iterative or incremental method affects various aspects of development and business including project management. What are the best sources to learn Agile? This post covers 10 powerful books that may enhance the skills of project managers and their teams.
Today this iterative or incremental method affects various aspects of development and business including project management. What are the best sources to learn Agile? This post covers 10 powerful books that may enhance the skills of project managers and their teams.
Uber & Careem merger: How the emerging taxi hailing services will affect in MENA region?
4 min
Managing your competition is an important skill that you need to have as a company. The management of competition can either be done by letting go of a market because it is too much to handle. You can also consider either selling yourself to a competition in a particular local market or acquiring them. Different companies adopted varied strategies according to the moment’s and the market’s demands.
Focus on Uber
Uber needs no introduction as a corporate or as a service provider. It has become synonymous with on-demand cab services and is slowly progressing towards providing many other services in the same fashion.
The phrase ‘Let's book an Uber’ has become common. In a decade, Uber has gained the status of a monopoly and has marked a prominent presence in more than 70 countries ever since its inception in 2009. However, it hasn't always been a bed of roses for Uber.
Uber has faced a lot of legal issues, some of them because of the legislature of the country, local drivers and passengers.
The dangers of using multi-character constants
2 min
During code analysis, PVS-Studio analyzes the data flow and operates variable values. Values are taken from constants or derived from conditional expressions. We call them virtual values. Recently, we have refined them in order to work with multi-character constants and this has become the reason to create a new diagnostic rule.
Introduction
Multi-character-literals are implementation-defined, so different compilers can encode them in different ways. For example, GCC and Clang set a value, based on the order of the symbols in the literal, while MSVC moves them depending on the symbol's type (regular or escape).
Various things in MetaPost
8 min
Translation
What is the best tool to use for drawing vector pictures? For me and probably for many others, the answer is pretty obvious: Illustrator, or, maybe, Inkscape. At least that's what I thought when I was asked to draw about eight hundred diagrams for a physics textbook. Nothing exceptional, just a bunch of black and white illustrations with spheres, springs, pulleys, lenses and so on. By that time it was already known that the book was going to be made in LaTeX and I was given a number of MS Word documents with embedded images. Some of them were scanned pictures from other books, some were pencil drawings. Picturing days and nights of inkscaping this stuff made me feel dizzy, so soon I found myself fantasizing about a more automated solution. For some reason MetaPost became the focus of these fantasies.
Indexes in PostgreSQL — 9 (BRIN)
18 min
Translation
In the previous articles we discussed PostgreSQL indexing engine, the interface of access methods, and the following methods: hash indexes, B-trees, GiST, SP-GiST, GIN, and RUM. The topic of this article is BRIN indexes.
Unlike indexes with which we've already got acquainted, the idea of BRIN is to avoid looking through definitely unsuited rows rather than quickly find the matching ones. This is always an inaccurate index: it does not contain TIDs of table rows at all.
Simplistically, BRIN works fine for columns where values correlate with their physical location in the table. In other words, if a query without ORDER BY clause returns the column values virtually in the increasing or decreasing order (and there are no indexes on that column).
This access method was created in scope of Axle, the European project for extremely large analytical databases, with an eye on tables that are several terabyte or dozens of terabytes large. An important feature of BRIN that enables us to create indexes on such tables is a small size and minimal overhead costs of maintenance.
This works as follows. The table is split into ranges that are several pages large (or several blocks large, which is the same) — hence the name: Block Range Index, BRIN. The index stores summary information on the data in each range. As a rule, this is the minimal and maximal values, but it happens to be different, as shown further. Assume that a query is performed that contains the condition for a column; if the sought values do not get into the interval, the whole range can be skipped; but if they do get, all rows in all blocks will have to be looked through to choose the matching ones among them.
It will not be a mistake to treat BRIN not as an index, but as an accelerator of sequential scan. We can regard BRIN as an alternative to partitioning if we consider each range as a «virtual» partition.
Now let's discuss the structure of the index in more detail.
BRIN
General concept
Unlike indexes with which we've already got acquainted, the idea of BRIN is to avoid looking through definitely unsuited rows rather than quickly find the matching ones. This is always an inaccurate index: it does not contain TIDs of table rows at all.
Simplistically, BRIN works fine for columns where values correlate with their physical location in the table. In other words, if a query without ORDER BY clause returns the column values virtually in the increasing or decreasing order (and there are no indexes on that column).
This access method was created in scope of Axle, the European project for extremely large analytical databases, with an eye on tables that are several terabyte or dozens of terabytes large. An important feature of BRIN that enables us to create indexes on such tables is a small size and minimal overhead costs of maintenance.
This works as follows. The table is split into ranges that are several pages large (or several blocks large, which is the same) — hence the name: Block Range Index, BRIN. The index stores summary information on the data in each range. As a rule, this is the minimal and maximal values, but it happens to be different, as shown further. Assume that a query is performed that contains the condition for a column; if the sought values do not get into the interval, the whole range can be skipped; but if they do get, all rows in all blocks will have to be looked through to choose the matching ones among them.
It will not be a mistake to treat BRIN not as an index, but as an accelerator of sequential scan. We can regard BRIN as an alternative to partitioning if we consider each range as a «virtual» partition.
Now let's discuss the structure of the index in more detail.