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Habr
parthiba @ Habr 3 place · 04/04/2022 09:37 EDT

Comparison between SwiftUI vs UIKit — Choosing the right framework

There has been a lot of debate going on among iOS developers with regards to the comparison between SwiftUI and UIKit. Have you been planning to develop a chat app for iOS and are confused as to which framework you should opt for? Fret not! We have got your back. In this article, we shall discuss all the relevant aspects revolving around these two and compare them in detail. Stay... Read more ›

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Habr
qqwrst @ Habr 3 place · 04/03/2022 22:34 EDT

The journey of scaling up a production Elasticsearch cluster

In this article, I will tell you about a-few-years journey of scaling the Elasticsearch cluster in production environment, which is one of the vital elements of the iPrice technology stack. I will describe challenges we encountered and how we approached them. Read more Read more ›

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Habr
IvanSGlazunov @ Habr 1 place · 04/01/2022 14:12 EDT

Math introduction to Deep Theory

In this article, we would like to compare the core mathematical bases of the two most popular theories and associative theory. Calculating deep Read more ›

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Habr
microcontroller @ Habr 2 place · 04/01/2022 08:16 EDT

[recovery mode] Electron + web camera (cpp-ffmpeg)

An example of using Electron + React JS and a native ffmpeg addon to access a webcameraThis guide may be helpful to someone who is trying to find a wayto work with Electron if they need to use a c++ library or code I was looking for a more realistic example than a simple 'hello world' and i didn't succeedHere are the links in advance:- electron - https://github.com/khomin/electron_camera_ffmpeg- addon -... Read more ›

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Habr
kaze_no_saga @ Habr 1 place · 03/28/2022 10:41 EDT

[Translation] Queries in PostgreSQL. Sequential Scan

Queries in PostgreSQL. Sequential scanIn previous articles we discussed how the system plans a query execution and how it collects statistics to select the best plan. The following articles, starting with this one, will focus on what a plan actually is, what it consists of, and how it is executed.In this article, I will demonstrate how the planner calculates execution costs. I will also discuss access methods and how they... Read more ›

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Habr
Makeman @ Habr 2 place · 03/28/2022 00:00 EDT

RIDDLES OF THE FAST FOURIER TRANSFORM

• The method of phase-magnitude interpolation (PMI)• Accurate measure of frequency, magnitude and phase of signal harmonics• Detection of resonancesThe Fast Fourier Transform (FFT) algorithm is an important tool for analyzing and processing signals of various nature.It allows to reconstruct magnitude and phase spectrum of a signal into the frequency domain by magnitude sample into the time domain, while the method is computationally optimized with modest memory consumption.Although there is... Read more ›

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Habr
igorHab @ Habr 1 place · 03/26/2022 02:59 EDT

How does Rust treat Strings and Vectors internally

In Rust strings can be represented in two ways:a)       String type b)      String sliceString type:String type is defined as a struct of the following structure:Depending on arch (in my case x86 64bit it is 24byte){   pointer to the address where string characters are stored (8b)   capacity (8b)   length (8b)} Read more Read more ›

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Habr
MasteR_GeliOS @ Habr 2 place · 03/25/2022 11:21 EDT

Enabling Apache Camel metrics in Spring Boot Actuator Prometheus

In this article I have described problems I have faced during integration Apache Camel with Spring Boot Actuator Prometheus for collecting metrics and my solution to solve this problem (which I haven't found over the internet). Read more Read more ›

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Habr
Fotei @ Habr 3 place · 03/25/2022 09:05 EDT

Traffic mirroring through HPE Virtual Connect

In this article I'd like to describe different traffic mirroring options for HPE Virtual Connect modules. I try to answer two questions: "What options work and why?" and "How different traffic mirroring cases can be implemented?" Read more Read more ›

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Habr
engineerdoc @ Habr 1 place · 03/16/2022 11:47 EDT

Creating a Weather Predictions App Using Flutter

This article describes how to develop a real-time weather prediction app in Flutter using the Tomorrow.io Weather API. The app consists of a single screen that displays the current weather and a 4-day daily forecast for a specific location. We’re creating this prediction app on Flutter because it is an open-source UI development kit, which means it can be integrated beautifully into desktop and mobile apps across various platforms, making... Read more ›

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Habr
UWA4d @ Habr 1 place · 03/12/2022 20:24 EDT

In-depth Analysis of Unity Loading Module â…¡: Shader

Free Tutorials & GuidesContinuing from the previous article of In-depth Analysis of Loading Modules, in which we focused on the loading performance of mesh resources, we will discuss about the loading efficiency of Shader resources for you today.Resource Loading Performance Test CodeLike the test code proposed in the previous article, we will use the same one for the loading performance analysis of Shader resources. At the same time, we will... Read more ›

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Habr
radneck @ Habr 2 place · 03/12/2022 02:40 EDT

Even shell scripts require unit tests

Once a upon a time I moved to brand new project. And without much thought, I decided to take DevOps responsibilities (after a long period of Frontend). Huge mono-repository (Angular and Node.js) gives rise to many specific problems. And this project was no exception. At the very beginning CI/CD duration was about 1.5h. And that was the biggest problem to take care of.But at first, I want to talk about... Read more ›

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Habr
UWA4d @ Habr 1 place · 03/10/2022 22:41 EDT

Analysis of UE5 Rendering Technology: Nanite

After Epic released the UE5 technology demo at the beginning of 2021, the discussion about UE5 has never stopped. Related technical discussions mainly centered on two new features: global illumination technology Lumen and extremely high model detail technology Nanite. There have been some articles [1 ][2] analyzing Nanite technology in more detail. This article mainly starts from the RenderDoc analysis and source code of UE5, combined with some existing technical... Read more ›

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Habr
brutto @ Habr 2 place · 03/10/2022 07:24 EDT

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Habr
Boozlachu @ Habr 1 place · 03/09/2022 01:00 EDT

Introducing into calamares bootloader

OverviewSometimes all of us need to make a graphical installer for one's own linux distro. It goes without saying that you are able to use a distro-specific installer like Anaconda for RedHat-based or DebianInstaller for debian-based. On the other hand Calamares is a graphical installer which is not aligned with only one package manager.I want to share my experience how to make a universal install solution with GUI. I did... Read more ›

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Habr
UWA4d @ Habr 1 place · 03/07/2022 22:18 EDT

UE5 Lumen Implementation Analysis

Lumen is UE5’s GI system, it is different from the traditional real-time GI which only includes the contribution of indirect diffuse reflection. It also includes indirect diffuse reflection and indirect highlight, providing a new set of complete indirect lighting. Lumen supports both hardware-based RTX and software-based Trace algorithms. The starting point of this article is that Lumen GI uses the process, algorithm, and data structure analysis of indirect diffuse reflection... Read more ›

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Habr
Carduelis @ Habr 2 place · 03/07/2022 05:29 EDT

[Translation] URL Search Params

Somehow I saw code in the project of a neighboring team that generated a string with URL parameters for subsequent insertion into the iframesrc attribute.This article may seem superfluous, obvious or too simple, but since this occurs in wildlife, you should not be silent about it, but rather share best-practices. Read more Read more ›

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Habr
UWA4d @ Habr 1 place · 03/03/2022 02:30 EDT

Unity Performance Optimization â…¥: Resource Memory Leak

Today, we will share some knowledge points related to resource memory leak. A memory leak is the most common issue that we continuously see and also are afraid of. What is the reason behind it? Because we can’t predict the extent of the leak before we locate the leak bottleneck, we had no idea whether it will burst out at a certain moment on the line. We have received feedback... Read more ›

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Habr
miti1777 @ Habr 1 place · 02/24/2022 09:16 EDT

Alternate of Packed-Binary Time Format

The Real-Time Clock (RTC) Calendar Registers in STM32 microcontrollers implemented in Binary Code Decimal format (BCD) i. e., every two digits are represented by one byte (low digit in 0-3 bits and high digit 4-7 bits). At least there are 5 bytes required to store date and time data in a such format. There are cases when memory allocation for time stamp might become critical, e. g., the events log... Read more ›

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Habr
ENCRY @ Habr 2 place · 02/23/2022 10:25 EDT

The Cryptocurrency Bandwagon

The spread of cryptocurrencies contributed to the development of many solutions based on a distributed ledger technology (blockchain). Although the scope of these solutions varies, most of them have the same basic set of security services, i.e. confidentiality, authenticity, and integrity. These features are granted by the practical applications of public key cryptography, in particular,  digital signature (DS). But unlike many other applications of public key cryptography, cryptocurrency networks do... Read more ›

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