Shared memory and multithreading in Node.js - Timur Shemsedinov - JSFest'19Timur Shemsedinov
Introduction to multithreading concurrent programming in Node.js with worker_threads, SharedArrayBuffer and Atomics. Examples of Race condition, Deadlock, Livelock and Starvation, Critical sections and Synchronization. Combination of asynchronous and concurrent programming with synchronization primitives: Semaphore, Counting Semaphore, Mutex, Monitor, Shared/Exclusive Locks, Queue Locks with priority etc. Use cases for shared memory and multithreading with thread-safe classes, data structures and Promises. Current state of worker_threads in Node.js, known problems and workarounds.
"Node.js threads for I/O-bound tasks", Timur ShemsedinovFwdays
In addition to blocking CPU-bound tasks, we can use worker_threads to run asynchronous non-blocking domain logic if our main event loop is already overloaded. Now we have perf_hooks API which can be used to create load balancer to spread load in worker pool to provide the most dense event loop utilization. Mentioned machinery can be encapsulated in a simple abstraction with async/await contract to have a solution competing with goroutines in Go for both convenience and efficiency.
Experimental Alternative Technological Stack. Web is terrible... We are going to remove everything except JavaScript.
• Impress (Highload Cloud Application Server for Node.js)
https://github.com/metarhia /Impress
• JSTP (JavaScript as a Transport Protocol)
https://github.com/ metarhia/JSTP
• Global Storage (JavaScript data structures as in-memory DBMS)
https://github.com/metarhia /GlobalStorage
• Console (is an Application Browser, no HTML, DOM, CSS, etc.)
https://github.com/metarhia /Console
Dicas para publicar e manter sua aplicação NodeJS em produção. Configure o Express corretamente, trate erros, use o Nginx no seu máximo, monitore sua aplicação javascript server-side com newrelic e logs.
Fundamental of Node.JS - Internship Presentation - Week7Devang Garach
Fundamental of Node.JS - Internship Presentation - Week 7
What is Node.JS
Features of Node.JS
Node.JS Architecture
Core modules in Node.JS
Node.JS Installation
npm
Creating first node.js application
Shared memory and multithreading in Node.js - Timur Shemsedinov - JSFest'19Timur Shemsedinov
Introduction to multithreading concurrent programming in Node.js with worker_threads, SharedArrayBuffer and Atomics. Examples of Race condition, Deadlock, Livelock and Starvation, Critical sections and Synchronization. Combination of asynchronous and concurrent programming with synchronization primitives: Semaphore, Counting Semaphore, Mutex, Monitor, Shared/Exclusive Locks, Queue Locks with priority etc. Use cases for shared memory and multithreading with thread-safe classes, data structures and Promises. Current state of worker_threads in Node.js, known problems and workarounds.
"Node.js threads for I/O-bound tasks", Timur ShemsedinovFwdays
In addition to blocking CPU-bound tasks, we can use worker_threads to run asynchronous non-blocking domain logic if our main event loop is already overloaded. Now we have perf_hooks API which can be used to create load balancer to spread load in worker pool to provide the most dense event loop utilization. Mentioned machinery can be encapsulated in a simple abstraction with async/await contract to have a solution competing with goroutines in Go for both convenience and efficiency.
Experimental Alternative Technological Stack. Web is terrible... We are going to remove everything except JavaScript.
• Impress (Highload Cloud Application Server for Node.js)
https://github.com/metarhia /Impress
• JSTP (JavaScript as a Transport Protocol)
https://github.com/ metarhia/JSTP
• Global Storage (JavaScript data structures as in-memory DBMS)
https://github.com/metarhia /GlobalStorage
• Console (is an Application Browser, no HTML, DOM, CSS, etc.)
https://github.com/metarhia /Console
Dicas para publicar e manter sua aplicação NodeJS em produção. Configure o Express corretamente, trate erros, use o Nginx no seu máximo, monitore sua aplicação javascript server-side com newrelic e logs.
Fundamental of Node.JS - Internship Presentation - Week7Devang Garach
Fundamental of Node.JS - Internship Presentation - Week 7
What is Node.JS
Features of Node.JS
Node.JS Architecture
Core modules in Node.JS
Node.JS Installation
npm
Creating first node.js application
Choosing the right parallel compute architecture corehard_by
Multi-core architecture is the present and future way in which the market is addressing Moore’s law limitations. Multi-core workstations, high performance computers, GPUs and the focus on hybrid/ public cloud technologies for offloading and scaling applications is the direction development is heading. Leveraging multiple cores in order to increase application performance and responsiveness is expected especially from classic high-throughput executions such as rendering, simulations, and heavy calculations. Choosing the correct multi-core strategy for your software requirements is essential, making the wrong decision can have serious implications on software performance, scalability, memory usage and other factors. In this overview, we will inspect various considerations for choosing the correct multi-core strategy for your application’s requirement and investigate the pros and cons of multi-threaded development vs multi-process development. For example, Boost’s GIL (Generic Image Library) provides you with the ability to efficiently code image processing algorithms. However, deciding whether your algorithms should be executed as multi-threaded or multi-process has a high impact on your design, coding, future maintenance, scalability, performance, and other factors.
A partial list of considerations to take into account before taking this architectural decision includes:
- How big are the images I need to process
- What risks can I have in terms of race-conditions, timing issues, sharing violations – does it justify multi-threading programming?
- Do I have any special communication and synchronization requirements?
- How much time would it take my customers to execute a large scenario?
- Would I like to scale processing performance by using the cloud or cluster?
We will then examine these issues in real-world environments. In order to learn how this issue is being addressed in a real-world scenario, we will examine common development and testing environments we are using in our daily work and compare the multi-core strategies they have implemented in order to promote higher development productivity.
Talking about future of NodeJS, from Node 7 to Node 10.
NPM 5. N-API, async_hooks, util.promisify().
A big part on the ESM vs CommonJS module loader, and all the problem NodeJS is facing to implement ESM.
Get on board the NodeJS Express as we take a journey through what makes NodeJS special. Server-side JavaScript that has an event loop for a heart, we'll delve into its single threaded nature and the advantages provided. From there we'll pass through the land of the Node Package Management tool, how to set up your own package and bring in useful 3rd party packages as dependencies. Our final destination is ExpressJS, a Sinatra inspired framework for NodeJS.
Node.js and How JavaScript is Changing Server Programming Tom Croucher
Node.js is a highly concurrent JavaScript server written on top of the V8 JavaScript runtime. This is awesome for a number of reasons. Firstly Node.js has re-architected some of the core module of V8 to create a server implementation that is non-blocking (similar to other event driven frameworks like Ruby’s Event Machine or Python’s Twisted). Event driven architectures are a natural fit for JavaScript developers because it’s already how the browser works. By using an event driven framework Node is not only intuitive to use but also highly scalable. Tests have shown Node instances running tens of thousands of simultaneous users.
This session will explore the architectural basics of Node.js and how it’s different from blocking server implementations such as PHP, Rail or Java Servlets. We’ll explore some basic examples of creating a simple server, dealing with HTTP requests, etc.
The bigger question is once we have this awesome programming environment, what do we do with it? Node already has a really vibrant collection of modules which provide a range of functionality. Demystifying what’s available is pretty important to actually getting stuff done with Node. Since Node itself is very low level, lot’s of things people expect in web servers aren’t automatically there (for example, request routing). In order to help ease people into using Node this session will look at a range of the best modules for Node.js.
Ustream vs Legacy, It's never too late to start your fight! #Jsist 2014Máté Nádasdi
A general talk about Ustream's revolution on our aging codebase. We had to make critical changes on our codebase to achieve more stability and scalability on the client side.
This talk is about encouragement with lot of tips and tricks if you are in a similar legacy situation.
https://speakerdeck.com/matenadasdi/ustream-vs-legacy-its-never-too-late-to-start-your-fight-jsist-2014
Choosing the right parallel compute architecture corehard_by
Multi-core architecture is the present and future way in which the market is addressing Moore’s law limitations. Multi-core workstations, high performance computers, GPUs and the focus on hybrid/ public cloud technologies for offloading and scaling applications is the direction development is heading. Leveraging multiple cores in order to increase application performance and responsiveness is expected especially from classic high-throughput executions such as rendering, simulations, and heavy calculations. Choosing the correct multi-core strategy for your software requirements is essential, making the wrong decision can have serious implications on software performance, scalability, memory usage and other factors. In this overview, we will inspect various considerations for choosing the correct multi-core strategy for your application’s requirement and investigate the pros and cons of multi-threaded development vs multi-process development. For example, Boost’s GIL (Generic Image Library) provides you with the ability to efficiently code image processing algorithms. However, deciding whether your algorithms should be executed as multi-threaded or multi-process has a high impact on your design, coding, future maintenance, scalability, performance, and other factors.
A partial list of considerations to take into account before taking this architectural decision includes:
- How big are the images I need to process
- What risks can I have in terms of race-conditions, timing issues, sharing violations – does it justify multi-threading programming?
- Do I have any special communication and synchronization requirements?
- How much time would it take my customers to execute a large scenario?
- Would I like to scale processing performance by using the cloud or cluster?
We will then examine these issues in real-world environments. In order to learn how this issue is being addressed in a real-world scenario, we will examine common development and testing environments we are using in our daily work and compare the multi-core strategies they have implemented in order to promote higher development productivity.
Talking about future of NodeJS, from Node 7 to Node 10.
NPM 5. N-API, async_hooks, util.promisify().
A big part on the ESM vs CommonJS module loader, and all the problem NodeJS is facing to implement ESM.
Get on board the NodeJS Express as we take a journey through what makes NodeJS special. Server-side JavaScript that has an event loop for a heart, we'll delve into its single threaded nature and the advantages provided. From there we'll pass through the land of the Node Package Management tool, how to set up your own package and bring in useful 3rd party packages as dependencies. Our final destination is ExpressJS, a Sinatra inspired framework for NodeJS.
Node.js and How JavaScript is Changing Server Programming Tom Croucher
Node.js is a highly concurrent JavaScript server written on top of the V8 JavaScript runtime. This is awesome for a number of reasons. Firstly Node.js has re-architected some of the core module of V8 to create a server implementation that is non-blocking (similar to other event driven frameworks like Ruby’s Event Machine or Python’s Twisted). Event driven architectures are a natural fit for JavaScript developers because it’s already how the browser works. By using an event driven framework Node is not only intuitive to use but also highly scalable. Tests have shown Node instances running tens of thousands of simultaneous users.
This session will explore the architectural basics of Node.js and how it’s different from blocking server implementations such as PHP, Rail or Java Servlets. We’ll explore some basic examples of creating a simple server, dealing with HTTP requests, etc.
The bigger question is once we have this awesome programming environment, what do we do with it? Node already has a really vibrant collection of modules which provide a range of functionality. Demystifying what’s available is pretty important to actually getting stuff done with Node. Since Node itself is very low level, lot’s of things people expect in web servers aren’t automatically there (for example, request routing). In order to help ease people into using Node this session will look at a range of the best modules for Node.js.
Ustream vs Legacy, It's never too late to start your fight! #Jsist 2014Máté Nádasdi
A general talk about Ustream's revolution on our aging codebase. We had to make critical changes on our codebase to achieve more stability and scalability on the client side.
This talk is about encouragement with lot of tips and tricks if you are in a similar legacy situation.
https://speakerdeck.com/matenadasdi/ustream-vs-legacy-its-never-too-late-to-start-your-fight-jsist-2014
Building a serverless company on AWS lambda and Serverless frameworkLuciano Mammino
Planet9energy.com is a new electricity company building a sophisticated analytics and energy trading platform for the UK market. Since the earliest draft of the platform, we took the unconventional decision to go serverless and build the product on top of AWS Lambda and the Serverless framework using Node.js. In this talk, I want to discuss why we took this radical decision, what are the pros and cons of this approach and what are the main issues we faced as a tech team in our design and development experience. We will discuss how normal things like testing and deployment need to be re-thought to work on a serverless fashion but also the benefits of (almost) infinite self-scalability and the peace of mind of not having to manage hundreds of servers. Finally, we will underline how Node.js seems to fit naturally in this scenario and how it makes developing serverless applications extremely convenient.
Technologies:
Backend
Frontend
Application architecture
Javascript
cloud computing
Azure Service Fabric and the Actor Model: when did we forget Object Orientation?João Pedro Martins
Session presented at DDD event in TVP/Microsoft UK HQ. Introduction to Azure Service Fabric, and focus on the actor model (formerly known as Project Orleans), with demos and documentation on how it is supported in Service Fabric. Goal: ask ourselves why did we really replace OO with "stateless services".
Video: https://www.youtube.com/watch?v=b6yLwvNSDck
Here's the showdown you've been waiting for: Node.js vs Play Framework. Both are popular open source web frameworks that are built for developer productivity, asynchronous I/O, and the real time web. But which one is easier to learn, test, deploy, debug, and scale? Should you pick Javascript or Scala? The Google v8 engine or the JVM? NPM or Ivy? Grunt or SBT? Two frameworks enter, one framework leaves.
This is the English version of the presentation. For the version with Japanese subtitles, see http://www.slideshare.net/brikis98/nodejs-vs-play-framework-with-japanese-subtitles
OpenSource API Server based on Node.js API framework built on supported Node.js platform with Tooling and DevOps. Use cases are Omni-channel API Server, Mobile Backend as a Service (mBaaS) or Next Generation Enterprise Service Bus. Key functionality include built in enterprise connectors, ORM, Offline Sync, Mobile and JS SDKs, Isomorphic JavaScript and Graphical API creation tool.
Node.js and microservices go hand in hand. This comes mainly from the design of Node.js. It is a specialised small platform with an enormous package environment. The NPM ecosystem provides a lot of packages you can use to build your microservice. The two most popular frameworks for this job are Express and Seneca. In this talk I will show you how you can communicate synchronously and asynchronously with your microservices and how easy it is to put your Node.js application into a docker container.
Why NBC Universal Migrated to MongoDB AtlasDatavail
NBCUniversal, a worldwide mass media corporation, was looking for a more affordable and easier way to manage their database solution that hosts their extensive online digital assets. With Datavail’s assistance, NBCUniversal made the move from MongoDB 3.6 to MongoDB Atlas on AWS.
In this presentation, learn how making this move enabled the entertainment titan to reduce overhead and labor costs associated with managing its database environment.
Presentation from RedDotRubyConf 2011 in Singapore. It explains multi-tenancy and why it is increasingly required for Rails development. Four of the many approaches are covered in some detail (including what resources we have available for re-use) and I end with a naive question (& call to action?) .. "Isn't it about time there was a 'Rails Way'?"
Presented at JAX London 2015.
The last few years have seen a huge growth in the usage of JavaScript, to the extent that it is often reported to be the #1 programming language in use today. Additionally, the arrival of server-side JavaScript through frameworks such as Node.js and Ringo.js, and JavaScript on the JVM through Nashorn and Avatar.js, means that enterprise web applications written in JavaScript are not just a possibility—but a reality for companies such as LinkedIn, eBay, Yahoo, ADP and Dow Jones. This session will compare and contrast the two platforms and describe the advantages of each for deploying, managing and monitoring highly scalable applications.
Conference: JS is Back! fwdays
In addition to blocking CPU-bound tasks, we can use worker_threads to run asynchronous non-blocking domain logic if our main event loop is already overloaded. Now we have perf_hooks API which can be used to create load balancer to spread load in worker pool to provide the most dense event loop utilization. Mentioned machinery can be encapsulated in a simple abstraction with async/await contract to have a solution competing with goroutines in Go for both convenience and efficiency.
Node.js Меньше сложности, больше надежности Holy.js 2021Timur Shemsedinov
If Node.js is your everyday tool, it's almost certain that you use it in the wrong way, Timur will prove that in a very short review, uncover anti-patterns in your daily standard solutions, and show you the way to much better practices. The only thing that creates obstacles in your way to knowledge is your laziness.
Low-code sells great, but in practice, it does not provide the benefits that vendors have claimed. What are the reasons and how can we get an advantage using the Low-code principle? Experience of radical rethinking and use-cases in enterprise applications together with multi-paradigm programming and metaprogramming.
https://fwdays.com/en/event/architecture-fwdays-2021/review/rethinking-low-code
Video: https://youtu.be/RS8x73z4csI
What is middleware?
Mixins, Reference pollution and shared state, Race condition and Abstraction leaks, Fat controller and layers mix, High coupling and Error ignoring
Мы закончим обзор новых возможностей Node.js и сложив все это вместе в Node.js Starter Kit (шаблона проекта) от сообщества Metarhia для построения надежных и масштабируемых облачных и кластерных приложений и быстрой разработки API для высоконагруженных и интерактивных систем. Будет опубликован манифест Metaserverless. Мы разберем код, обсудим использование новейших возможностей платформы Node.js и фундаментальных знаний CS для построения грамотной структуры и архитектуры проекта.
Видео: https://youtu.be/r1u-dGocm1c
План 2-го вебинара: Обзор распространенных проблем: утечки памяти и ресурсов, игнорирование ошибок и потенциальных мест их появления, нарушение принципов GRASP и SOLID в Node.js, понятия связанности и зацепления программных компонентов, применение GoF паттернов и других шаблонов проектирования, обзор антипаттернов в Node.js и как это должно влиять на написание ежедневного кода.
Структура та архітектура програмних систем
Комітет АПУ з питань телекомунікацій, інформаційних технологій та Інтернету запрошує вас взяти участь у другомузаході третього сезону проекту «HowdoesITwork?», присвяченого структурі та архітектурі програмних систем.
Про що будемо говорити?
- Що таке мова програмування, компілятор, транслятор, класифікація мов програмування, які є мови програмування та сфери їх використання.
- Які є програмні компоненти: що таке фрейморк, бібліотека, модуль, клас, репозиторій, та як вони застосовуються в процесі розробки.
- Що таке середовище розробки, IDE, лінтер, CI/CD, та інші засоби та інфраструктурні компоненти розробки.
- Архітектура програмних рішень, клієнт-серверні, багатошарові, монолітні сервери, бекенд та фронтенд, сервісний підхід, мікросервіси, контейнери, хмарні технології.
- Особливості використання Open source коду при створенні програмних систем за різними ліцензіями та безпека використання відкритого коду.
- Організація процесу розробки, надійність, якість, ревью кода, рефакторінг, системи контролю версій, володіння кодом та bus-factor
Спікер:
Тимур Шемседінов, архітектор технологічного стеку та лідер спільноти Метархія, викладач КПІ, 2й у Github рейтингу розробників України, керівник R&D по створенню високонавантажених хмарних технологій.
Fwdays вединар: Node.js in 2020: Выйди и зайди нормально - Часть 1
Видео: https://youtu.be/GJY2dyE6328?t=480
За последние 5 лет Node.js очень изменился, но знания о платформе у сообщества остались на уровне 2013-2015 годов, все те же подходы, все те же проблемы. Сообщество плохо следит за новыми возможности, а если и узнает про них, то это не влияет на написание ежедневного кода. В Node.js, да и в JavaScript, слабо проникают фундаментальные знания по программной инженерии и архитектуре, параллельному программированию, GRASP, SOLID, GoF, а если и проникают, то не подвергаются адаптации и переосмыслению. Поэтому, среди других языков программирования JavaScript воспринимается, как несерьезный, а Node.js, как платформа для малограмотных людей. Как преодолеть эту тенденцию и как изменить подход к разработке на Node.js в 2020 году, с использованием всех современных возможностей и знаний, а так же, что нужно изменить в ежедневных практиках написания кода, эти и другие вопросы будут освещены в докладе «Node.js в 2020: Выйди и зайди нормально».
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
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HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
The Internet of Things (IoT) is a revolutionary concept that connects everyday objects and devices to the internet, enabling them to communicate, collect, and exchange data. Imagine a world where your refrigerator notifies you when you’re running low on groceries, or streetlights adjust their brightness based on traffic patterns – that’s the power of IoT. In essence, IoT transforms ordinary objects into smart, interconnected devices, creating a network of endless possibilities.
Here is a blog on the role of electrical and electronics engineers in IOT. Let's dig in!!!!
For more such content visit: https://nttftrg.com/
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
5. Is Node.js ready for Enterprise?
Yes, sure
Node.js is ready
But JavaScript developers...
6. Is Node.js ready for Enterprise?
Yes, sure
Node.js is ready
But JavaScript developers are not
7. New features
● Multithreading for calculations and scale
(added in v10, stable in v12)
● WASI, Node-API 8, V8 v9 for Node.js v16, npm 7
● API: diagnostic API, perf_hooks, timer promises,
AbortController, vm, v8, scrypt, Web crypto api,
async_hooks, AsyncLocalStorage, etc.
● QUIC or HTTP/3 especially for mobile and 5G
8. Monkey job
Everything repeats every time we start a project
● Let’s discuss scaling, we expect highload
● We need microservices, REST and ORM
● People, vision and setup processes
● Application architecture and structure
● Select tools, libraries, frameworks
● Code conventions, repository maintenance
9. Node.js challenges
● Enterprise requirements: Reliability,
Maintainability, High Availability, Security,
Isolation, Compatibility
● Community culture: meetups, conferences,
fundamental SC knowledge, consensus
● Reputation and trust: education, certification,
success stories
15. How to think about you code
It’s glue and business-logic code
Semantically and syntactically flexible
Very expressive (you can create DSL)
Simple for maintenance and changes
Simple and readable for everyone
Works everywhere
Easy to integrate
16. Engineering culture
● Architecture: DDD and clean code, layered
architecture, domain in the middle
● Principles and patterns: GRASP, SOLID, GoF,
IoC, DI, coupling и cohesion, Law of Demeter
● Project structure: framework-agnostic
● Techniques: error handling, asynchronous and
parallel programming, metaprogramming...
17. Important aspects
● Application is the place for applied code
● Declarative code is better than imperative
● State: reliability, performance, interactivity
● Configuration and infrastructure in the code
● Getting rid of dependencies
● We use layered architecture
18. Related to Node.js
● Context isolation and v8 sandboxes
● Don’t block event-loop
● Avoiding race conditions and leaks
● Avoid reference pollution and mixins
● Don’t use middlewares
● Implement graceful shutdown
● Limit concurrency (async queue or semaphore)
19. Important for Enterprise
● Business needs quick prototyping (TTM)
● We need security audit and certifications,
so get rid of dependencies
● Enterprise prefers low-code
● Modeling visualisation
(BPMN, ERD, state diagram, process flow)
20. Layered (onion) Architecture
Domain
model
Domain services
Application services
Presentation
Infrastructure
Persistence
Postgres
Redis
External API
Logger
Configs
Scheduler
Health mon
Validation
Cryptography
Sessions
App firewall
AAA
Web UI
Mobile UI
API gateway
21. Middleware: big ball of mud
models
controllers
logger
configs
AAA
validation
cryptography
sessions
routing
middlewares
db
configs
rendering
24. High coupling
● References are passed to other parts of the
application (examples: req, res, socket, person,
payment, logger, session, scheduler...)
● Passed objects mutations due to mixins will
breaks our expectations
● Remaining references are visible from contexts
so memory leaks and we need restarts
26. What we get
● Framework-agnostic application
● Transport-agnostic communications
● No race conditions in asynchronous code
● No memory leaks and resource leaks
● Errors are handled properly
● Code reuse, no code duplication
● A few and reliable dependencies
27. What we get
● DI (dependency-injection)
● Automatic routing (directory based)
● Context isolation
● Parse cookie without middlewares
● Sessions without middlewares
● Authentication without middlewares
● Concurrency control with semaphores
41. Powered by schemas
● Contracts and data-structures validation
● Autogenerated .d.ts typings
● SQL DDL (database structure)
● Automated-migrations and structure versioning
● Scaffolding for DB access
● UI (web and mobile)
● Declarative data projections and aggregations
42. GRASP
General responsibility assignment software
patterns
“Applying UML and Patterns: An Introduction to
Object-Oriented Analysis and Design and Iterative
Development” // Craig Larman
43. GRASP
General responsibility assignment software
patterns
• Low Coupling • High Cohesion
• Information Expert • Creator
• Controller • Polymorphism
• Pure Fabrication • Indirection
• Protected Variations
44. GRASP: Information Expert
Problem: What is a basic principle by which to
assign responsibilities to objects?
Solution: Assign responsibility to the class that has
the information needed to fulfill it.
Benefits: Low Coupling, High Cohesion, Code
simplicity, Better encapsulation, Code reuse.
45. GRASP: Cohesion & Coupling
Cohesion (связность)
inside class, module,
component. etc.
Coupling (зацепление)
between classes
and other components
46. GRASP: Creator
Problem: Who creates object instance?
(who holds reference or destroy it)
Solution: composition containers (who aggregate
instances), who works with it and closely use it,
who have initializing information for instances.
Benefits: Low Coupling
Examples: constructor, factory, object pool.
47. GRASP: Controller
Problem: Who should be responsible for handling
an input system event?
Solution: Controller - communication entry point,
all system operations; delegates BL.
Benefits: protection, handle concurrency,
asynchronity, and parallel programming issues.
Examples: command, facade, layer isolation.
48. GRASP: Polymorphism
Polymorphism - alternative behaviour based on
type (see SOLID: LSP, OCP).
Problem: how to handle behavioral alternatives
based on type (or class)?
Solution: assign responsibility to the classes,
select one of type/class instead of if-statements,
access by interface or abstract class.
49. GRASP: Indirection
Indirection - intermediate object will decrease
coupling between two abstractions.
Benefits: Low Coupling, Code reuse.
Examples: GoF Mediator pattern (посредник),
MVC, С - controller.
50. GRASP: Pure fabrication
Pure fabrication - an abstraction that does not
exist in the subject area. It often reduces the
overlapping of domain classes.
Examples: Socket, DB Query, EventEmitter,
Promise, Asynchronous queue.
51. GRASP: Protected variations
Problem: How to design objects, subsystems, and
systems so that the variations or instability in
these elements does not have an undesirable
impact on other elements?
Solution: Identify points of predicted variation or
instability; assign responsibilities to create a stable
interface around them.
52. Summarize the approach
● Architecture: DDD and clean code, layered
architecture, domain in the middle
● Principles and patterns: GRASP, SOLID, GoF,
IoC, DI, coupling и cohesion, Law of Demeter
● Project structure: framework-agnostic
● Techniques: error handling, asynchronous and
parallel programming, metaprogramming...
53. LoD (Law of Demeter)
● Module should “knows” less about others
(low coupling), access through interfaces (ISP)
● All components communicates only with
neighbors and talks explicitly
● A class method works with its arguments,
other methods and properties of the instance
and its first-level structural parts
54. What we get
● Code reuse, no boilerplate
● A few and reliable dependencies
(pg 803 kb, ws 118 kb = 921 kb)
● System code 6 kb, applied code: 837 b
● Metarhia (5 June): 286 kb (JavaScript: 155 kb)
● Characteristics: Portability, Reliability, Security,
Isolation, Maintainability, High Availability