• Patroni cluster (with Zookeeper) in a docker swarm on a local machine

    • Tutorial

    There probably is no way one who stores some crucial data (and well, in particular, using SQL databases) can possibly dodge from thoughts of building some kind of safe cluster, distant guardian to protect consistency and availability at all times. Even if the main server with your precious database gets knocked out deadly - the show must go on, right? This basically means the database must still be available and data be up-to-date with the one on the failed server.

    As you might have noticed, there are dozens of ways to go and Patroni is just one of them. There is plenty of articles providing a more or less detailed comparison of the options available, so I assume I'm free to skip the part of luring you into Patroni's side. Let's start off from the point where among others you are already leaning towards Patroni and are willing to try that out in a more or less real-case setup.

    I am not a DevOps engineer originally so when the need for the high-availability cluster arose and I went on I would catch every single bump on the road. Hope this tutorial will help you out to get the job done with ease! If you don't want any more explanations, jump right in. Otherwise, you might want to read some more notes on the setup I went on with.

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  • A Guide to App Monetization in China

      Introduction and Context

      So you’ve just finished developing the next mobile gaming smash hit. You’ve already planned to launch your game worldwide and win the hearts of gamers everywhere. But what you haven’t done yet is think about how you’re going to make any money from your success and hard work. Of course, you’ve imagined becoming an instant millionaire, but you just don’t know how to get there.  

      Fear not, intrepid developer! Instead of just rehashing the tired headlines and beating the same old drum, we’ve tailored our Ad Monetization write-up for developers who are gearing up to publish their game or app in China. We’ve scoured the internet, grabbed insight from ad giants like Google, Smartyads, and PocketGamer.biz and combined it with our own hands-on knowledge of what works in China—knowledge that we have gained from the past  5 years in the industry.

      We need to briefly explore how monetization functions as a utility within the context of game design. This is especially true when examining how developers in China have made meaningful design decisions that have both shaped and been shaped by user habits. Unpacking the utility of Chinese game monetization will help developers understand why Ads Monetization or Hybrid Monetization strategies have become so popular, especially in China.

      Moving from monetization design, we’ll examine some of the best practices regarding Ads Monetization. Finally,  we’ll turn to specific case studies in the Chinese market that show how powerful Ads Monetization, specifically Rewarded Videos, can be in a well-balanced monetization strategy. 

      Designing Monetization as a Utility

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    • Confusing extensions in Swift

      This post is a little bit the information aggregator. If you find a mistake, you could write to me about it I really appreciate that. Have a nice read.

      Example with JSONDecoder

      What would happen if we run the following piece of code?

      struct Test<T>: Codable where T: Codable {
          enum CodingKeys: String, CodingKey {
              case value
          let value: T
          let info: String
      extension Test {
          init(from decoder: Decoder) throws {
              let container = try decoder.container(keyedBy: CodingKeys.self)
              self.value = try container.decode(T.self, forKey: .value)
              self.info = "Default init(from decoder:)"
      extension Test where T == String {
          init(from decoder: Decoder) throws {
              let container = try decoder.container(keyedBy: CodingKeys.self)
              self.value = try container.decode(T.self, forKey: .value)
              self.info = "Custom init(from decoder:)"
      let data = #"{"value":"Hello, World!"}"#.data(using: .utf8)!
      let object = try? JSONDecoder().decode(Test<String>.self, from: data)

      Try thinking for 5 seconds about the result.

      The result
              value: "Hello, World!", 
              info: "Default init(from decoder:)"

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    • Launching Grenades in Unreal with Gameplay Ability System: Part 1

      This is the first tutorial in the series dedicated to Gameplay Ability System. The goal for these tutorials is to be easily digestible, 10 minutes-long reads focused on getting a working prototype of a gameplay mechanic on screen as fast as possible. So whatever you new to Unreal Engine or new to Gameplay Ability System, Designer, Animator, or Technical Artist, these tutorials will help you build your projects faster and stop being afraid of using GAS for your projects.

      This series requires little to no knowledge of C++. It requires a basic knowledge of Blueprints scripting and general knowledge about unreal asset types and their use for building gameplay. I tried to cover steps in as much detail as possible and provide GIFs and plenty of images to help you on your way to the result, which is just 20-30 minutes away from now.

      I wish you good luck and let's go!


      The end result we will be able to see very soon.

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    • What App Stores can you consider except Apple App Store and Google Play Store? Here are 6 Alternative App Stores

        Recently Epic Games’ Fortnite was removed from the Apple App Store and Google Play Store. The main reason being Epics bypassing of in-app purchases instead of using the officially sanctioned system for both platforms. While it is still possible for you to download Fortnite directly, this large scale case brings to light the duopoly of Apple and Google in the mobile market.

        For most developers, these two stores account for almost all of their revenue and userbase. While Epic Games will be fine to go without, for the time being, what about the other 99% of developers who rely on these two stores for distributing and monetizing their apps. In this article, we’ll provide some of the alternative stores available for both developers and consumers for finding or distributing apps.

        For one reason or another, you may have found yourself wondering, ‘where are some other places I can go to find and download new apps and games for my mobile device’? Or ‘are there any other marketplaces for me to share my apps’?

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      • OPPO, Huawei, Xiaomi. Chinese app stores join forces to take on Google

          Major players in the Chinese app market are joining forces to take on the almighty Google Play store. Xiaomi, Oppo and Vivo are reported to launch the Global Developer Service Alliance (GDSA), a platform allowing Android developers to publish their apps in the partnering stores from one upload.

          The GDSA is expected to launch in nine countries—including India, Indonesia, Malaysia, Russia, Spain, Thailand, the Philippines, and Vietnam—although paid app support may vary across the regions. Canalys’ Nicole Peng explains the wide reach of this alliance:

          By forming this alliance each company will be looking to leverage the others’ advantages in different regions, with Xiaomi’s strong user base in India, Vivo and Oppo in Southeast Asia, and Huawei in Europe. 

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        • The Different RPG styles between East and West


          The Chinese Mobile RPG: the Genre of Giants.

          Chinese RPGs make up 56% of the top 500 grossing iOS games in China. According to data gathered in 2019 by Game Refinery’s Joel Julkunen. Let’s take a look at the genre and some important points for game developers and RPG enthusiasts to consider Chinese Mobile RPGs.

          RPG or role-playing game is a game where the player plays as a character, often the main character, in a fictional game world.

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        • Toxic Comments Detection in Russian

            Currently, social network sites tend to be one of the major communication platforms in both offline and online space. Freedom of expression of various points of view, including toxic, aggressive, and abusive comments, might have a long-term negative impact on people’s opinions and social cohesion. As a consequence, the ability to automatically identify and moderate toxic content on the Internet to eliminate the negative consequences is one of the necessary tasks for modern society. This paper aims at the automatic detection of toxic comments in the Russian language. As a source of data, we utilized anonymously published Kaggle dataset and additionally validated its annotation quality. To build a classification model, we performed fine-tuning of two versions of Multilingual Universal Sentence Encoder, Bidirectional Encoder Representations from Transformers, and ruBERT. Finetuned ruBERT achieved F1 = 92.20%, demonstrating the best classification score. We made trained models and code samples publicly available to the research community.
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          • ConcurrenCpp — The C++ concurrency library


              concurrencpp allows applications to write asynchronous code easily and safely by using executors and coroutines.

              By using concurrencpp applications can break down big procedures that need to be processed asynchronously into smaller tasks that run concurrently and work in a co-operative manner to achieve the wanted result.

              concurrencpp also allows applications to write parallel algorithms more easily by using parallel coroutines.

              concurrencpp main advantages are:

              • Being able to write non-blocking, asynchronous code easily by using the C++20 coroutines and the co_await keyword.
              • Being able to write modern concurrent code without having to rely on low-level concurrency primitives like locks and condition variables.
              • The concurrency runtime manages all low-level resources such as threads automatically.
              • Reducing the possibility of race conditions, data races and deadlocks by using high-level objects with built-in synchronization.
              • concurrencpp provides various types of commonly used executors with a complete coroutine integration.
              • Applications can extend the library by using their own provided executors.
              • Applications automatically scale-up to use all hardware processors (cores).
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            • Solving coding problems with Kotlin: Collection functions

                (originally published on Medium)

                I have talked to many Android developers, and most of them are excited about Kotlin. So am I. When I just started learning Koltin, I was solving Kotlin Koans, and along with other great features, I was impressed with the power of functions for performing operations on collections. Since then, I spent three years writing Koltin code but rarely utilised all the potential of the language.

                During this year, I did more than a hundred coding problems on Leetcode in Java. I didn’t switch to Kotlin because I know the syntax of Java 6 so well, that I could effortlessly write code without autocompletion and syntax highlighting. But I didn’t keep track of new Java features, as Android support of Java SDK lacked many versions behind. I didn’t switch to Kotlin for solving problems right away. Although I was writing Kotlin code for several years, I felt that I need to make an extra cognitive effort to get the syntax and the language constructions right. Solving algorithmic problems, especially under the time pressure, is very different from Android app development. Still, the more I learned about Kotlin, the more I realised how many powerful features I’m missing, and how much boilerplate code I need to write.

                One day, I have decided that I need to move on, so I started a new session in Leetcode and switched the compiler to Kotlin. I solved just a few easy problems, but I already feel that I have something to share.

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              • SIEM Solutions Overview (Security Information and Event Management)

                Modern corporate IT infrastructure consists of many systems and components. And monitoring their work individually can be quite difficult — the larger the enterprise is, the more burdensome these tasks are. But there are the tools, which collect reports on the work of the entire corporate infrastructure — SIEM (Security Information and Event Management) system in one place. Read the best of such products according to Gartner experts in our review, and learn about the main features from our comparison table.
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              • Making python's dream of multithreading come true


                  So you are writing some CPU-intensive code in Python and really trying to find ways out of its single-threaded prison. You might be looking towards Numba's "nopython parallel" mode, you might be using forked processes with multiprocessing, you might be writing microservices with database-like coordinators, or even writing your own multithreaded programs in C/C++ just like creators of TensorFlow did.

                  In this article I'm describing a rationale for my pet project where I try to implement facilities for general purpose multitasking to be used in a form of simple python code, employing a database-like approach for interpreters communication, while keeping the GIL (Global Interpreter Lock) and trying to be as pythonic as possible.

                  It could also become handy in the light of upcoming multiple interpreters support in CPython.

                  As far as I know, nobody came that far in trying to provide Python program with native shareable storage. The last closest attempt was Python Object Sharing which is pretty much dead by now. I hope my project won't meet the same fate.

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                • How to rank higher on Google?


                  There are different approaches to manage construct a brand online, get leads and win in business. By the by, on the off chance that you know a smidgen at a time measure on the most proficient strategy to rank higher on Google first page nothing can stop your business developing expedient. Different SEO methodologies are basic when ranking on Google typically. Additionally, you head the centre insider real factors.

                  Once more thing you ought to have is consistent quality considering the route that in 2019 SEO requires some certified imperativeness and only the best page that gives the most spurring power to the clients will rank. Notwithstanding, for that, your site page ought to get made and more references must come towards the site page with backlinks. Backlinks are an inside factor to rank higher on Google search. After the On-page, SEO is done well, by and large, your next off-site SEO work begins with vault posting for citation building. It must be done by specialists and Dinesh is the world's best as for citation building.
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                • Check how you remember nullable value types. Let's peek under the hood


                    Recently nullable reference types have become trendy. Meanwhile, the good old nullable value types are still here and actively used. How well do you remember the nuances of working with them? Let's jog your memory or test your knowledge by reading this article. Examples of C# and IL code, references to the CLI specification, and CoreCLR code are provided. Let's start with an interesting case.
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                  • How to make integration with 50 suppliers and not get crazy

                    • Translation
                    There are many supplier types. Some suppliers ready to get your data format, another — don't; some use SOAP protocol, another — REST; some uses EAN for goods identification — another uses offer ID; some ready to give you order status, another — don't, some uses vocabulary, witch elements you need to map with your’ s master data, another — don't. Simply put — suppliers are extremely different.

                    However, we need to automate the data exchange. Now is the 21st century. In perfect world we need to found the B2B conference for suppliers and them customers (in auto part market in my case) and develop one data exchange format and be happy. Unfortunately, we live in imperfect world.
                    Read more →