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Article

Spring Cloud Gateway: The Single Point of Entry or Failure – a Path to Non-Blocking API Gateway

Level of difficulty Hard
Reading time 20 min
Views 913

Hello Habr! My name is Nikita Letov. I am a tech lead of backend development in remote banking services for individuals (or retail department) of Rosbank. In this article I will describe what a point of entry to an app is, when it becomes vital, and how API Gateway can help you. We'll review a traditional blocking pattern based on Netflix Zuul 1.x gateway with all its problems of using, then reactive Spring Cloud Gateway and difficulties of moving to it. Finally, we'll compare these two approaches.

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Total votes 2: ↑2 and ↓0 +2
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Post

В аэропортах продают подушки для сна сидя в полете. Надувные и обычные. Надувные удобнее носить и возить, но они долго не живут. А обычные по размеру как ручная кладь в Победе.

Обычная сверху и надувная снизу
Обычная сверху и надувная снизу

Если вам нравятся надувные, то полезно знать, что в полете давление в самолете на 25 процентов меньше чем на земле.

Поэтому если надуть подушку нормально еще до взлета, то она при наборе высоты будет раздуваться пока швы не разойдутся.

Надо ее или сдувать по мере взлета или надувать уже на высоте.

А не надувным подушкам высота не страшна.

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0
Comments 1
Post

Простое крепление проводов в контроллерах idiBus. Без кабельных каналов. Дешево и сердито.

Вдоль торца платы ряд отверстий
Вдоль торца платы ряд отверстий

Выходящие провода крепятся хомутами прямо к плате через отверстия по краю платы.

Или есть специальные хомуты, которые вставляются в эти отверстия.

Принимаются предложения и идеи по всяким полезным видам крепления проводов.

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+2
Comments 3
Article

Portable SystemVerilog Examples for ASIC and FPGA: the results of the meetup on 2024-01-21 and the next steps

Reading time 4 min
Views 1K

The second meetup of the Portable SystemVerilog Examples group on January 21 2024 at Hacker Dojo in Mountain View, California, went as planned: we moved from the stage of presenting the project to the self-introductions of the participants and the initial tutorial with the first examples. We also started distributing the tasks. The next meetup is tentatively scheduled for January 28 at the same location, from 2 pm to 5 pm. The contents of the meeting will be to work on the examples: basics-graphics-music and systemverilog-homework.

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Total votes 2: ↑1 and ↓1 0
Comments 0
Article

Implementing hypervisor-level behavioral analysis in Linux

Level of difficulty Medium
Reading time 7 min
Views 513

Hey there, Habr! My name is Alexey Kolesnikov. I am a Malware Detection Specialist at the Positive Technologies Expert Security Center (PT ESC). I recently spoke at the AVAR 2023 international conference in Dubai, where I covered new plugins developed by PT ESC for an open-source dynamic malware analysis system named DRAKVUF and demonstrated how they can be used to detect current Linux threats in sandbox for protection against targeted and mass attacks PT Sandbox.

Read on for a brief overview of popular malware monitoring tools for Linux, a description of how our plugins work in DRAKVUF, and a malware analysis that relies on these plugins.

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Total votes 2: ↑1 and ↓1 0
Comments 0
Article

How Closures Work and Why It Matters

Level of difficulty Medium
Reading time 8 min
Views 954

They might sound complicated, but they are actually a fundamental part of the language. In this article, we’ll explore closures in a straightforward and practical way. Let’s clear up common misunderstandings. Walk through real-world examples. Nail those tricky interview questions about closures. By the end, you’ll see closures not as a hurdle, but as a valuable part of your JavaScript toolkit.

Continue Closure Journey
Total votes 4: ↑4 and ↓0 +4
Comments 0
Article

Evaluating Performance: CosmosDB vs. Azure SQL

Level of difficulty Easy
Reading time 4 min
Views 4.7K

In the evolving landscape of database technology, choosing the right database management system is crucial for the efficiency and scalability of applications. This article presents a detailed comparison of the performance between Microsoft's CosmosDB and MS SQL Server. We'll examine how each database performs under various load conditions and share some interesting findings.

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

The next steps after a good meetup on Portable SystemVerilog Examples for ASIC and FPGA

Reading time 4 min
Views 663

The meetup on January 14 at Hacker Dojo in Mountain View, California, went well, although not as planned - we spent almost all the time talking instead of doing hands-on exercises. The room we booked can fit 30 people and approximately 30 people did show up. The quality of participants was high: approximately half were familiar with hardware description languages and another half came from various software topics. 12 people filled out the questionnaire despite the fact that I forgot to bring 30 pens.

The discussion during and after the presentation was focused and very meaningful: microarchitecture and education, EDA infrastructure / build scripts, open-source ASIC design tools, the economics of ASIC design and manufacturing, high-level synthesis, transaction-level modeling, ASIC prototyping using FPGA boards, FPGA embedded in ASIC (Menta), new FPGA manufacturers (Gowin) and new design languages - Chisel and SpinalHDL.

Four persons came to me after the meeting to discuss their participation in working on open-source portable SystemVerilog examples, and another seven expressed this intention in the questionnaire. So we are meeting again in Hacker Dojo on Sunday, January 21, at 2 PM, this time not in the classroom area, but in the common shared area.

Generally, I am thinking of having regular meetings, probably on a weekly basis for a small team of developers of the educational materials and on a monthly basis for a wider audience, discussing various design and verification topics.

There were two correspondents of Slavic Sacramento who recorded the video of the presentation. They are going to make it available soon.

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Total votes 7: ↑6 and ↓1 +5
Comments 2
Article

PostgreSQL 17: Part 3 or Commitfest 2023-11

Level of difficulty Medium
Reading time 11 min
Views 483


The November commitfest is ripe with new interesting features! Without further ado, let's proceed with the review.


If you missed our July and September commitfest reviews, you can check them out here: 2023-07, 2023-09.


ON LOGIN trigger
Event triggers for REINDEX
ALTER OPERATOR: commutator, negator, hashes, merges
pg_dump --filter=dump.txt
psql: displaying default privileges
pg_stat_statements: track statement entry timestamps and reset min/max statistics
pg_stat_checkpointer: checkpointer process statistics
pg_stats: statistics for range type columns
Planner: exclusion of unnecessary table self-joins
Planner: materialized CTE statistics
Planner: accessing a table with multiple clauses
Index range scan optimization
dblink, postgres_fdw: detailed wait events
Logical replication: migration of replication slots during publisher upgrade
Replication slot use log
Unicode: new information functions
New function: xmltext
AT LOCAL support
Infinite intervals
ALTER SYSTEM with unrecognized custom parameters
Building the server from source

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

Import chat history to Telegram (приглашение)

Level of difficulty Medium
Reading time 3 min
Views 995
image

I'm seeking anyone who is skilled enough to develop a simple Python script using TDLib, Telegram API, and JSON manipulation to make it possible to perform simple tasks listed below:

1. Import Telegram chat JSON backup back to Telegram similar to what these scripts are doing github.com/alexlyzhov/telegram-import
github.com/Suberbia/UltimateChatRestorer
github.com/mygrexit/UltimateChatRestorerForGroupchats
but for any chat (not only to «saved messages») including group chats (not only 1 to 1 chats) and improve the code to make it work faster, more reliable, write log file, allow continuing from the stop point in case of errors and keep all the original chat data including formatting and everything that telegram can handle.
Some kinda combine all the script in one universal, flexible, high quality tool.
The most important aspect of the whole task is that the imported messages have to keep not only the formatting, but its original date and time when they were actually sent. Like it is done in the original telegram tool for importing history from some other apps — telegram.org/blog/move-history

2. Make it very simple to use. Perfect solution will be: Download, put the script next to JSON backup and run it in the interactive mode or with some specific options. Let the script ask for all the credentials and briefly explain where to get them. If possible, keep all the job on one device with no need of transferring the WA format zip file to the phone for importing. If not possible, make it an android app which will get the JSON, process it and feed the result to the Telegram app for import.

This is the basic I'm going to pay for.
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Total votes 6: ↑3 and ↓3 0
Comments 2
Article

Flashforge Creator 3: A Comprehensive Guide to Elevating Your 3D Printing Experience

Reading time 5 min
Views 233

The Flashforge Creator 3 is a hallmark of innovation in the bustling world of 3D printing. This versatile printer is known for its dual extruder system, precision, and user-friendly interface, catering to the needs of both enthusiasts and professionals.

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

React Global State Management: A Brief History and a Quick Guide

Level of difficulty Easy
Reading time 9 min
Views 733

If you’re a React developer, you know how important state management is. State is the data that powers your UI, making it interactive and dynamic. But managing state in React can be tricky, especially when you have to share it across multiple components or deal with complex and asynchronous logic.

That’s why over the years, React developers have come up with various solutions for state management, each with its own advantages and disadvantages. In this article, we’ll take a look at some of the most popular ones and how they evolved. We’ll also review some of the current state-management libraries and how to choose the best one for your app.

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

The breakthrough concept around new rocket engine based on hybrid of chemical and electric technology and plasma physics

Level of difficulty Hard
Reading time 37 min
Views 1.3K

 Gleb Kulev, Candidate of Technical Sciences

The rapid exploration of outer space has faced a problem related to the insufficient efficiency of modern rocket engines. As a solution to this problem, the concept of a jet engine based on new operating principles is proposed, using a combination of known physical laws and having advantages over known types of jet engines.The article presents the results of testing three modifications of jet engines based on new operating principles and their analysis. The article discusses the physical principles of operation of a jet engine based on new principles, its advantages and problems arising during its creation.

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Total votes 6: ↑6 and ↓0 +6
Comments 3
Article

Unveiling the Flashforge Creator 3 Pro 3D Printer: A Detailed Review

Reading time 3 min
Views 163

The Flashforge Creator 3 Pro is a sophisticated 3D printer that has made waves in the desktop 3D printing market. It blends the boundary between professional and personal use, offering features usually found in industrial-grade printers. This machine is tailored for users who require precision, versatility, and the ability to work with advanced materials.

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

Unveiling the Capabilities of the Raise3D Pro3 3D Printer: A Comprehensive Review

Reading time 4 min
Views 134

The Raise3D Pro3 3D Printer marks a significant stride in the world of professional 3D printing. As the latest innovation from a renowned brand, the Pro3 is anticipated to set new benchmarks in print quality, reliability, and user experience for both professionals and enthusiasts.

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

Exploring the Flashforge Guider 3 Plus: A Comprehensive 3D Printer Review

Reading time 2 min
Views 90

The Flashforge Guider 3 Plus emerges as a powerful player in the professional FDM 3D printing market. Developed by the Chinese-based manufacturer Flashforge, this model is designed to fulfill the rigorous demands of industrial applications. It distinguishes itself with an array of smart features that are indispensable for high-quality and efficient 3D printing​​​​.

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Total votes 3: ↑3 and ↓0 +3
Comments 0
Article

FreeScan UE Pro 3D Scanner: Revolutionizing Precision and Efficiency

Reading time 6 min
Views 139

3D scanning technology has witnessed remarkable advancements, and at the forefront of this evolution is the FreeScan UE Pro 3D Scanner. This revolutionary device has not only simplified the process of 3D scanning but also brought precision and efficiency to an unprecedented level. The FreeScan UE Pro stands out for its ability to capture intricate details, making it an invaluable tool across various industries, from engineering to healthcare.

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Total votes 3: ↑3 and ↓0 +3
Comments 0