Presentation
•
0 likes•372 views
This document discusses using RabbitMQ and message queues to process events from connected devices in a microservices architecture. RabbitMQ can be used to implement common messaging patterns like publish/subscribe and push/pull to distribute processing of device data across multiple services. It provides examples of using RabbitMQ exchanges, queues, and bindings to route messages based on topics and load balance work. Error handling is also addressed through retry queues and dedicated error services.
Report
Share
Report
Share
Download to read offline
Recommended
Reducing load with RabbitMQ
My story how I've used RabbitMQ to parallelize some tasks for load reducing. Talk presented during Vilnius PHP meetup.
Long running php processes
How to maintain long running PHP processes?
How to scale long running PHP processes?
Common pitfalls & tips.
2013 - Brian Stanley - Memcached, Cached all the things
This document discusses Memcached, a distributed caching system that stores data and objects in memory for fast access. It can be used to cache database queries, API responses, and other computationally expensive operations. Memcached is an in-memory key-value store that uses a simple client-server architecture over TCP/IP or UDP. It allows storing and retrieving arbitrary data (strings, objects) indexed by keys.
Zing Me Real Time Web Chat Architect
This document discusses the architecture of Zing Me's web chat platform. It has over 45 million registered users and handles over 500 servers. The web chat uses a connection server implemented in C++ with epoll to handle over 100,000 concurrent connections through long polling. It also uses a friend online server and message server. The message server stores messages and notifies of new messages through queues. Workers then deliver messages to users via the connection server. The architecture was developed over several months by multiple teams to provide real-time messaging capabilities at scale for Zing Me.
Playframework Hamburg Meetup #1 - Reactive persistence with Play 2 & postgres...
About Play Framework 2 asynchronous request handling and async, non-blocking database access using postgresql-async.
The working architecture of NodeJs applications
Talk at KharkivJs 2017, Viktor Turskyi.
Why talk about the architecture?
1) 99% of NodeJs examples on Internet are “hello world” examples
2) A lot of misunderstandings around architectural patterns
Node Introduction
Node - An Introduction discusses the history and uses of Node.js. It began as a way to build real-time applications on the web as the internet became more interactive in the late 1990s and 2000s. Node.js is an asynchronous, JavaScript-based language well-suited for applications with a lot of input/output tasks and less CPU usage. It uses the Google V8 engine and has a thriving developer community supported by third-party libraries like Express and Socket.IO. The course overview outlines topics that will be covered including asynchronous programming in Node, networking, databases, building websites with Express, and creating chat applications with Socket.IO. Hands-on experience will be provided through CloudLabs and a real
Microservices with spring boot
This document discusses microservices architecture and how it compares to monolithic architecture. It notes some advantages of microservices such as independent scalability, fault isolation and faster deployments. However, microservices also introduce more operational complexity. The document recommends Spring Boot as a solution for building microservices due to its features like embedded servers, auto-configuration and production-ready environments without XML configuration. It also describes Spring Boot Actuator which adds monitoring endpoints.
Recommended
Reducing load with RabbitMQ
My story how I've used RabbitMQ to parallelize some tasks for load reducing. Talk presented during Vilnius PHP meetup.
Long running php processes
How to maintain long running PHP processes?
How to scale long running PHP processes?
Common pitfalls & tips.
2013 - Brian Stanley - Memcached, Cached all the things
This document discusses Memcached, a distributed caching system that stores data and objects in memory for fast access. It can be used to cache database queries, API responses, and other computationally expensive operations. Memcached is an in-memory key-value store that uses a simple client-server architecture over TCP/IP or UDP. It allows storing and retrieving arbitrary data (strings, objects) indexed by keys.
Zing Me Real Time Web Chat Architect
This document discusses the architecture of Zing Me's web chat platform. It has over 45 million registered users and handles over 500 servers. The web chat uses a connection server implemented in C++ with epoll to handle over 100,000 concurrent connections through long polling. It also uses a friend online server and message server. The message server stores messages and notifies of new messages through queues. Workers then deliver messages to users via the connection server. The architecture was developed over several months by multiple teams to provide real-time messaging capabilities at scale for Zing Me.
Playframework Hamburg Meetup #1 - Reactive persistence with Play 2 & postgres...
About Play Framework 2 asynchronous request handling and async, non-blocking database access using postgresql-async.
The working architecture of NodeJs applications
Talk at KharkivJs 2017, Viktor Turskyi.
Why talk about the architecture?
1) 99% of NodeJs examples on Internet are “hello world” examples
2) A lot of misunderstandings around architectural patterns
Node Introduction
Node - An Introduction discusses the history and uses of Node.js. It began as a way to build real-time applications on the web as the internet became more interactive in the late 1990s and 2000s. Node.js is an asynchronous, JavaScript-based language well-suited for applications with a lot of input/output tasks and less CPU usage. It uses the Google V8 engine and has a thriving developer community supported by third-party libraries like Express and Socket.IO. The course overview outlines topics that will be covered including asynchronous programming in Node, networking, databases, building websites with Express, and creating chat applications with Socket.IO. Hands-on experience will be provided through CloudLabs and a real
Microservices with spring boot
This document discusses microservices architecture and how it compares to monolithic architecture. It notes some advantages of microservices such as independent scalability, fault isolation and faster deployments. However, microservices also introduce more operational complexity. The document recommends Spring Boot as a solution for building microservices due to its features like embedded servers, auto-configuration and production-ready environments without XML configuration. It also describes Spring Boot Actuator which adds monitoring endpoints.
Moodle performance and stress testing
Have you experienced a Moodle site failure during a critical time? Are you worried that your Moodle service won't be able to meet your needs at the busiest times? This session will cover a variety of methods to ensure optimal performance of Moodle under peak load. The session will address general resource guidelines for expected concurrency and help administrators determine the correct sizing of IT resources for an expected Moodle load. The session will also cover benchmarking techniques that can be used to measure the actual performance of your Moodle infrastructure.
Zingme practice for building scalable website with PHP
This document discusses best practices for building scalable PHP websites, as demonstrated by ZingMe's architecture. It describes how ZingMe uses a scale-out approach with load balancing, centralized session storage, and an automated code deployment system. The key aspects covered are load balancing with HAProxy, overriding PHP's session handling to use Memcached, and configuring servers identically through version control and scripts. The goal is to gracefully handle increasing traffic by adding commodity servers within 5 minutes while maintaining a consistent environment.
NullMQ @ PDX
NullMQ aims to provide ZeroMQ semantics in the browser by using STOMP over WebSocket. STOMP is a simple, extensible protocol that can model virtual connections and transactions over a single WebSocket connection. NullMQ embraces the nature of the web by using existing transports and protocols rather than direct connections. This allows for near feature parity with ZeroMQ while addressing security and performance limitations of the browser environment.
Services, dependencies, and you
This document outlines principles for writing maintainable code using a service-oriented architecture approach. It recommends defining reusable service objects that each focus on a single domain concept or business logic. These service objects should make their dependencies explicit through their constructor signatures. This makes the code more modular and testable. It also lays the foundation for potentially extracting services into microservices later. The document provides these recommendations and emphasizes that keeping code separated by concern and with well-defined dependencies leads to more maintainable code over time. It concludes by promising code examples demonstrating these principles.
JMeter performance and scalability in Moodle Montana Moot 2014
Using jMeter Moodle admins can help assess the capacity or potential capabilities of their Moodle site. With jMeter testing, admins can determine what kind of concurrency they should expect to be able to achieve with their current server configuration. This workshop would then tie into a one-hour session related to performance
Distributed Systems
A simple explanation of basic principles of Distributed Programming with NodeJS. The CAP Theorem is fully explained, with working code the you can try yourself!
Wordlist Generation and Wifi Cracking
This document discusses different methods for generating wordlists to crack passwords, including social engineering and dictionary attacks. It provides information on the software tool Crunch that can be used to generate wordlists with combinations of characters, numbers, and special characters. The document also covers different wireless security protocols like WEP, WPA, and WPA2 and vulnerabilities in WEP that allow the key to be cracked. It demonstrates social engineering attacks using a tool called Wifiphisher and dictionary attacks against WPA/WPA2 secured networks.
React web development
This document provides an overview of React including what it is, who uses it, its core concepts, and why one should use React. React is a library for building user interfaces that uses a component-based approach and virtual DOM for declarative programming. It allows components to be written once and used on the web, mobile, and beyond. Core concepts include components, virtual DOM, and unidirectional data flow. Benefits of React include the ability to write code once and deploy anywhere, fast rendering with virtual DOM, and the growing demand for React skills.
Welcome to NPM search 2.0
This document introduces NPM Search 2.0 and discusses opportunities to improve the functionality of searching NPM's enormous database of Node.js libraries. It notes that finding the right library can be difficult and time-consuming. While NPM search is better than other platforms, perfection is not the goal - rather, continuous improvement. A few alternative search sites are presented that may provide more personalized or flexible search options for developers.
Cache hcm-topdev
The document discusses how to build a system that can handle high access requests. It covers optimizing performance at the node level and scaling to multiple nodes. It then discusses various problems that can occur at different levels, from the client to the server to cross-server, and provides solutions for issues like caching, load balancing, and communication between servers. The overall goal is to understand where bottlenecks can occur and how to optimize each component to build a scalable system that can handle high traffic loads.
Tools to create a secure build pipeline
When you want to secure your code there are a variety of tools that you can use, each of them dedicated to a specific stage in the project lifecycle. Of course, there are static code analysis tools (SAST) that you can use sometimes even on your editor, but what about SIS? DAST? IAST? WAF? And, wait, are you still using *just* prepared statements and not a RASP solution? Do not be scared of all these acronyms! Learn which opensource tools are available now, which ones are on the frontier, and what are the techniques available. After a 20 minutes introduction with slides, we will install and run plenty of them, live, so that hopefully you will be able to use them the next day yourself!
This is an updated version of the previous speech.
RestMS Introduction
RestMS is a new protocol for web messaging that aims to provide a simple yet capable solution based on open standards. It takes the best aspects of AMQP, such as its generic routing model, and AtomPub, such as its RESTful access over HTTP, and combines them. RestMS allows publishers to send messages to feeds and subscribers to create pipes that join feeds to receive and process messages. It uses common REST/HTTP operations and aims to be easy to use while still providing high performance and interoperability.
[DevDay 2019] Reactive Programming with JavaScript - By Pham Nguyen Duc, Web ...
A quick introduction to Reactive Programming which is programming with asynchronous data streams. With RxJS you are given an amazing toolbox of functions to combine, create and filter any of those streams.
Microservices - the lean way
My speech about Microservices at Geecon Prague: what are microservices and why we use them? what are the anti-patterns? what opensource solution we can use to manage them?
Fosdem 2009
- The document discusses the need for simpler messaging standards and protocols as an alternative to complex and proprietary solutions.
- It introduces AMQP as an open protocol for messaging but notes it is still complex. It then presents RestMS as a simpler RESTful alternative to AMQP that works over plain HTTP.
- Examples are given of using RestMS through HTTP requests and responses to create feeds and send messages. Open source projects including Zyre, OpenAMQ, and X5 are discussed which implement RestMS.
ZaloPay Merchant Platform on K8S on-premise
This document summarizes an incident and lessons learned from deploying a Kubernetes cluster on-premise to run the ZaloPay Merchant Platform. Key issues encountered included nodes breaking production after being scaled, multi-interface configuration challenges, and nodes failing to join the cluster. Lessons included practicing deployments, understanding root causes of failures, and ensuring business support for new technologies. Next steps outlined upgrading components, consolidating monitoring, improving alerts, and automating the CI/CD pipeline.
Moodle performance optimizations
This presentation builds on a 6 month student project about measuring the performance of a moodle installation, and suggestions for what can be done to improve the performance, without changing the code.
This presentation summarises our testing method, and our performance recommendations
Алексей Злобин «Scala in Goozy»
Scala was used for the API server of the Goozy social networking application due to its fast performance, concise and expressive syntax, and ability to utilize existing Java libraries. While Lift was initially used for REST and JSON serialization, it had performance issues and a poor code style. The team then moved to the Cake pattern to address conceptual problems with component dependencies, using mixins to share common functionality. Validation from Scalaz was also utilized to validate request parameters in a type-safe manner. Integration testing was performed on the HTTP interface using JUnit and scenarios to avoid regression without depending on implementation details.
Code in python
This document introduces Python as a multi-purpose, object-oriented, interpreted, strongly and dynamically typed programming language that is readable, flexible, fast and powerful. It discusses how Python is used by companies like Google, PBS and NASA. It provides instructions for setting up the Python environment and writing a simple "Hello World" program. It also briefly covers Python concepts like indentation, comments, variables, if/for/while statements, functions, lists, tuples and strings.
La generación y el uso limpios y adecuados de energía
El documento trata sobre la generación y uso eficiente de energía. Explica que la población urbana está creciendo rápidamente y se espera que alcance el 66% de la población mundial en 2050. Este crecimiento conlleva un aumento en el consumo de energía. Sin embargo, es posible lograr un crecimiento económico manteniendo o reduciendo el consumo mediante medidas de eficiencia energética como mejor aislamiento en viviendas, uso de electrodomésticos eficientes y aprovechamiento de energías renovables.
Artist Mise-En-Scene
The document discusses the mise-en-scene elements that will be used in an upcoming music video, including props, actors, costumes, and outfits. Specifically, it mentions using mobile phones as props to represent communication among the new generation. It plans to feature two boys showing off wealth similarly to Chris Brown and Tyga's "Ayo" video. Costumes will include shorts, polos, and sneakers to suit the summer weather and pop genre. Outfits for the artists will be bright colored to match the positive vibe, with the males appearing stylish and casual.
More Related Content
What's hot
Moodle performance and stress testing
Have you experienced a Moodle site failure during a critical time? Are you worried that your Moodle service won't be able to meet your needs at the busiest times? This session will cover a variety of methods to ensure optimal performance of Moodle under peak load. The session will address general resource guidelines for expected concurrency and help administrators determine the correct sizing of IT resources for an expected Moodle load. The session will also cover benchmarking techniques that can be used to measure the actual performance of your Moodle infrastructure.
Zingme practice for building scalable website with PHP
This document discusses best practices for building scalable PHP websites, as demonstrated by ZingMe's architecture. It describes how ZingMe uses a scale-out approach with load balancing, centralized session storage, and an automated code deployment system. The key aspects covered are load balancing with HAProxy, overriding PHP's session handling to use Memcached, and configuring servers identically through version control and scripts. The goal is to gracefully handle increasing traffic by adding commodity servers within 5 minutes while maintaining a consistent environment.
NullMQ @ PDX
NullMQ aims to provide ZeroMQ semantics in the browser by using STOMP over WebSocket. STOMP is a simple, extensible protocol that can model virtual connections and transactions over a single WebSocket connection. NullMQ embraces the nature of the web by using existing transports and protocols rather than direct connections. This allows for near feature parity with ZeroMQ while addressing security and performance limitations of the browser environment.
Services, dependencies, and you
This document outlines principles for writing maintainable code using a service-oriented architecture approach. It recommends defining reusable service objects that each focus on a single domain concept or business logic. These service objects should make their dependencies explicit through their constructor signatures. This makes the code more modular and testable. It also lays the foundation for potentially extracting services into microservices later. The document provides these recommendations and emphasizes that keeping code separated by concern and with well-defined dependencies leads to more maintainable code over time. It concludes by promising code examples demonstrating these principles.
JMeter performance and scalability in Moodle Montana Moot 2014
Using jMeter Moodle admins can help assess the capacity or potential capabilities of their Moodle site. With jMeter testing, admins can determine what kind of concurrency they should expect to be able to achieve with their current server configuration. This workshop would then tie into a one-hour session related to performance
Distributed Systems
A simple explanation of basic principles of Distributed Programming with NodeJS. The CAP Theorem is fully explained, with working code the you can try yourself!
Wordlist Generation and Wifi Cracking
This document discusses different methods for generating wordlists to crack passwords, including social engineering and dictionary attacks. It provides information on the software tool Crunch that can be used to generate wordlists with combinations of characters, numbers, and special characters. The document also covers different wireless security protocols like WEP, WPA, and WPA2 and vulnerabilities in WEP that allow the key to be cracked. It demonstrates social engineering attacks using a tool called Wifiphisher and dictionary attacks against WPA/WPA2 secured networks.
React web development
This document provides an overview of React including what it is, who uses it, its core concepts, and why one should use React. React is a library for building user interfaces that uses a component-based approach and virtual DOM for declarative programming. It allows components to be written once and used on the web, mobile, and beyond. Core concepts include components, virtual DOM, and unidirectional data flow. Benefits of React include the ability to write code once and deploy anywhere, fast rendering with virtual DOM, and the growing demand for React skills.
Welcome to NPM search 2.0
This document introduces NPM Search 2.0 and discusses opportunities to improve the functionality of searching NPM's enormous database of Node.js libraries. It notes that finding the right library can be difficult and time-consuming. While NPM search is better than other platforms, perfection is not the goal - rather, continuous improvement. A few alternative search sites are presented that may provide more personalized or flexible search options for developers.
Cache hcm-topdev
The document discusses how to build a system that can handle high access requests. It covers optimizing performance at the node level and scaling to multiple nodes. It then discusses various problems that can occur at different levels, from the client to the server to cross-server, and provides solutions for issues like caching, load balancing, and communication between servers. The overall goal is to understand where bottlenecks can occur and how to optimize each component to build a scalable system that can handle high traffic loads.
Tools to create a secure build pipeline
When you want to secure your code there are a variety of tools that you can use, each of them dedicated to a specific stage in the project lifecycle. Of course, there are static code analysis tools (SAST) that you can use sometimes even on your editor, but what about SIS? DAST? IAST? WAF? And, wait, are you still using *just* prepared statements and not a RASP solution? Do not be scared of all these acronyms! Learn which opensource tools are available now, which ones are on the frontier, and what are the techniques available. After a 20 minutes introduction with slides, we will install and run plenty of them, live, so that hopefully you will be able to use them the next day yourself!
This is an updated version of the previous speech.
RestMS Introduction
RestMS is a new protocol for web messaging that aims to provide a simple yet capable solution based on open standards. It takes the best aspects of AMQP, such as its generic routing model, and AtomPub, such as its RESTful access over HTTP, and combines them. RestMS allows publishers to send messages to feeds and subscribers to create pipes that join feeds to receive and process messages. It uses common REST/HTTP operations and aims to be easy to use while still providing high performance and interoperability.
[DevDay 2019] Reactive Programming with JavaScript - By Pham Nguyen Duc, Web ...
A quick introduction to Reactive Programming which is programming with asynchronous data streams. With RxJS you are given an amazing toolbox of functions to combine, create and filter any of those streams.
Microservices - the lean way
My speech about Microservices at Geecon Prague: what are microservices and why we use them? what are the anti-patterns? what opensource solution we can use to manage them?
Fosdem 2009
- The document discusses the need for simpler messaging standards and protocols as an alternative to complex and proprietary solutions.
- It introduces AMQP as an open protocol for messaging but notes it is still complex. It then presents RestMS as a simpler RESTful alternative to AMQP that works over plain HTTP.
- Examples are given of using RestMS through HTTP requests and responses to create feeds and send messages. Open source projects including Zyre, OpenAMQ, and X5 are discussed which implement RestMS.
ZaloPay Merchant Platform on K8S on-premise
This document summarizes an incident and lessons learned from deploying a Kubernetes cluster on-premise to run the ZaloPay Merchant Platform. Key issues encountered included nodes breaking production after being scaled, multi-interface configuration challenges, and nodes failing to join the cluster. Lessons included practicing deployments, understanding root causes of failures, and ensuring business support for new technologies. Next steps outlined upgrading components, consolidating monitoring, improving alerts, and automating the CI/CD pipeline.
Moodle performance optimizations
This presentation builds on a 6 month student project about measuring the performance of a moodle installation, and suggestions for what can be done to improve the performance, without changing the code.
This presentation summarises our testing method, and our performance recommendations
Алексей Злобин «Scala in Goozy»
Scala was used for the API server of the Goozy social networking application due to its fast performance, concise and expressive syntax, and ability to utilize existing Java libraries. While Lift was initially used for REST and JSON serialization, it had performance issues and a poor code style. The team then moved to the Cake pattern to address conceptual problems with component dependencies, using mixins to share common functionality. Validation from Scalaz was also utilized to validate request parameters in a type-safe manner. Integration testing was performed on the HTTP interface using JUnit and scenarios to avoid regression without depending on implementation details.
Code in python
This document introduces Python as a multi-purpose, object-oriented, interpreted, strongly and dynamically typed programming language that is readable, flexible, fast and powerful. It discusses how Python is used by companies like Google, PBS and NASA. It provides instructions for setting up the Python environment and writing a simple "Hello World" program. It also briefly covers Python concepts like indentation, comments, variables, if/for/while statements, functions, lists, tuples and strings.
What's hot (19)
Zingme practice for building scalable website with PHP
Zingme practice for building scalable website with PHP
JMeter performance and scalability in Moodle Montana Moot 2014
JMeter performance and scalability in Moodle Montana Moot 2014
[DevDay 2019] Reactive Programming with JavaScript - By Pham Nguyen Duc, Web ...
[DevDay 2019] Reactive Programming with JavaScript - By Pham Nguyen Duc, Web ...
Viewers also liked
La generación y el uso limpios y adecuados de energía
El documento trata sobre la generación y uso eficiente de energía. Explica que la población urbana está creciendo rápidamente y se espera que alcance el 66% de la población mundial en 2050. Este crecimiento conlleva un aumento en el consumo de energía. Sin embargo, es posible lograr un crecimiento económico manteniendo o reduciendo el consumo mediante medidas de eficiencia energética como mejor aislamiento en viviendas, uso de electrodomésticos eficientes y aprovechamiento de energías renovables.
Artist Mise-En-Scene
The document discusses the mise-en-scene elements that will be used in an upcoming music video, including props, actors, costumes, and outfits. Specifically, it mentions using mobile phones as props to represent communication among the new generation. It plans to feature two boys showing off wealth similarly to Chris Brown and Tyga's "Ayo" video. Costumes will include shorts, polos, and sneakers to suit the summer weather and pop genre. Outfits for the artists will be bright colored to match the positive vibe, with the males appearing stylish and casual.
Интернет-магазина от а до я - Александр Васильев - AWG
Создание и развитие интернет-магазина от а до я: с чего начать, первые шаги, сложности и подводные камни
Risk and compliance is a Business Strength
PLUGGING THE GAPS IN DATA LOSS.
When it comes to controlling data loss, THERE ARE STILL SOME SURPRISING GAPS …
And when it comes to enforcing information security policies and managing compliance more effectively, THERE ARE SOME SURPRISINGLY EASY WINS …
Reciclar en las Aulas
La Escuela Pablo Pizzurno en San Antonio de Litín, Córdoba participa en un proyecto de reciclaje liderado por la profesora Graciela Pérez, con el objetivo de reutilizar materiales como cartón, telgopor, tela y madera para crear objetos decorativos y de uso cotidiano. La escuela busca reducir la contaminación por residuos sólidos y enseñar a los estudiantes la importancia del reciclaje a través de actividades prácticas y la ambientación del patio y las aulas con materiales reciclados
Restaurant porter kpi
The document discusses key performance indicators (KPIs) for restaurant porters. It provides examples of KPIs, outlines steps to create KPIs for porters, discusses common mistakes in KPI creation, and how to design effective porter KPIs linked to strategy and goals. The document recommends visiting an external website for additional KPI samples, performance appraisal forms, review methods and phrases to evaluate porter performance.
Reciclar en cordoba
La Responsabilidad Extendida del Productor (REP) es un principio que extiende las responsabilidades de los fabricantes a todas las fases del ciclo de vida de un producto, especialmente su recuperación y disposición final. La ley REP en Argentina obliga a fabricantes e importadores a organizar y financiar la gestión de residuos de seis productos prioritarios como envases, electrónicos y pilas. El objetivo es promover la prevención, reutilización y valorización de residuos para mejorar la gestión de basura en el país.
Contabilidad de costos
Este documento presenta una introducción a la contabilidad de costos. Explica que la contabilidad de costos determina el costo de producir bienes o servicios. Define los elementos del costo como materiales directos, mano de obra directa y costos indirectos de fabricación. Clasifica los costos y gastos en costos de producción, gastos del período, gastos de distribución y gastos financieros. Finalmente, compara las funciones de una empresa comercial frente a una empresa de transformación e incluye una tabla sobre la declaración del IVA.
Q1 front cover
The document discusses how the media product's front cover uses, develops, or challenges conventions of real magazines. It follows conventions such as including a masthead, cover lines on the sides, and medium shots for the main image. However, it challenges conventions by having the main image looking away from the camera, a barcode designed as a microphone, pricing in the top left corner instead of by the barcode, and issue date below the masthead instead of by the barcode. Overall, it both follows and challenges conventions to make the design appealing and informative for the target audience.
Basics of accounting_level_ii
This document provides an overview of basic accounting level II. It discusses what accounting is, how to best learn accounting, the difference between accounting and finance, key accounting concepts and conventions, accounting events, rules of accounting, how to prepare financial statements, and provides a simple case study. The key topics covered include defining accounting as recording, classifying and summarizing financial transactions for preparing financial statements, emphasizing understanding concepts over rote learning of rules, and explaining common accounting concepts like business entity, money measurement, and accounting conventions like going concern and consistency.
NI Company Profile
PT Nusantara Infrastructure Tbk is a leading private infrastructure company in Indonesia that provides services in toll roads, ports, energy, water, and telecommunications towers. The company owns assets across Indonesia, including toll roads in Jakarta and Makassar, a port in Lampung, a water treatment plant in Tangerang, and over 400 telecommunications towers nationwide. PT Nusantara Infrastructure is committed to accelerating infrastructure development in Indonesia to improve quality of life.
Señales
El documento relata un sueño en el que el autor veía su vida representada en el cielo mientras caminaba con Jesús. Observó que a veces sólo veía un par de huellas en la arena, lo que ocurría principalmente durante las horas de angustia y tristeza en su vida cuando más necesitaba consuelo. Le preguntó a Jesús por qué no veía las otras huellas que indicaban su compañía durante las tormentas, a lo que Jesús respondió que siempre estaría a su lado para mostrarle su amor, y que si sólo veía un par de huellas era
Deacon PowerPoint pptx
Deacon 3300 is an extruded gasket compound suitable for extreme temperatures between -425°F and 1200°F. It maintains flexibility to fill voids and irregularities in flanges better than die-cut gaskets. It is ideal for metal-to-metal applications involving steam, hot air, or chemicals. Deacon 8875-Thin and 7228 are paste sealants for threads and flanges that set pliably and resist chemicals and hydrocarbons. Deacon 770-L is a liquid sealant for applications from 200-950°F, sealing joints and dressing gaskets in steam, liquids, hydrocarbons and solvents.
Narrative theories
Todorov theorized that narratives follow an equilibrium-disequilibrium-new equilibrium structure. Propp identified 31 narrative features and 7 character types that commonly appear in stories, including the villain, donor, helper, princess, false hero, dispatcher, and hero. Strauss proposed that conflict drives narratives and they can only end once conflict is resolved, often using binary opposites to create more conflict. Barthes referred to the "enigma code" where clues are given in stories without resolving the overall story, keeping the audience engaged.
А. Васильев "Создание интернет-магазина: первые шаги, сложности и подводные к...
Всеукраинский семинар 1С Битрикс "Интернет-магазин: от создания до продвижения". Семинар проведен компанией интернет-маркетинга AWG.ua в Одессе 4 июня 2015г. Доклад Александра Васильева, «AWG».
Hawaii conference2015
This document summarizes a collaborative workshop on plagiarism presented by librarians from California State University, Los Angeles and Adelphi University. It provides background on their experience researching and educating students and faculty about plagiarism. It then describes two plagiarism workshops conducted in 2014 and shares the results of surveys given to students. The workshops addressed what constitutes plagiarism, how to properly cite sources, and use of plagiarism detection tools. Student feedback indicated the workshops helped increase understanding and most would recommend them to friends. The document concludes by encouraging collaboration across campus to continually educate on research, writing and citation rules.
naturaleza
La Unión Europea ha propuesto un nuevo paquete de sanciones contra Rusia que incluye un embargo al petróleo ruso. El embargo se aplicaría gradualmente durante seis meses para el petróleo crudo y ocho meses para los productos refinados. El objetivo es aumentar la presión sobre Rusia para que ponga fin a su invasión de Ucrania.
Total learning: The Intersection of Formal, Social and Experiential Learning
90% of learning is social and informal yet LMS solutions focus on the formal 10%. The concept of Total Learning is to embrace the informal and use it for a competitive advantage.
Viewers also liked (20)
La generación y el uso limpios y adecuados de energía
La generación y el uso limpios y adecuados de energía
Интернет-магазина от а до я - Александр Васильев - AWG
Интернет-магазина от а до я - Александр Васильев - AWG
А. Васильев "Создание интернет-магазина: первые шаги, сложности и подводные к...
А. Васильев "Создание интернет-магазина: первые шаги, сложности и подводные к...
Total learning: The Intersection of Formal, Social and Experiential Learning
Total learning: The Intersection of Formal, Social and Experiential Learning
Similar to Presentation
Activity feeds (and more) at mate1
The document provides an overview of Mate1, an online dating company, and their transition to using Kafka and Cassandra for their activity feed and data storage. Some key points:
- Mate1 started in 2003 and has grown to around 40 employees, with a 13 person engineering team. They own their own hardware.
- They previously used a "fan-out on read" approach where activity data was stored across different databases and querying them to generate feeds was slow.
- They transitioned to a "fan-out on write" approach using Kafka to queue activity events and Cassandra to store aggregated user feeds and counters. This improved performance and scalability.
- Events are published to Kafka topics and
Gatling - Bordeaux JUG
The document discusses the importance of performance and load testing web applications. It defines performance as how fast, robust, and resource-effective a system is. Load testing involves stressing an application with simulated user load to determine its capacity and stability under heavy usage. The document outlines best practices for load testing methodology, tooling, and interpreting results to optimize performance. It promotes using an asynchronous, non-blocking tool like Gatling for efficient, maintainable load testing that provides meaningful reports.
Node.js Web Apps @ ebay scale
eBay journey to Node.js including specific areas that the platform team had to go through to succeed in this process.
Proactive monitoring tools or services - Open Source
Deel 1: (Open source) Monitoring tools in alle maten en gewichten [18:00 tot 19:30]
In deze sessie probeert Jan Guldentops op basis van zijn 20 jaar ervaring uit te leggen wat een monitoring oplossing in theorie zou moeten kunnen, waar u het kan toepassen en waar u moet op letten bij de selectie van een monitoring oplossing.
We overlopen de verschillende oplossingen op de markt ( open source, close source, hosted services, etc.) Daarna gaan we dieper in op de open source nagios oplossing en hoe wij bij BA deze geintegreerd hebben in ons eigen monitoringsysteem. Daarna geven we een korte demo van dit monitoringsysteem in een aantal verschillende omgevingen en hoe ver u kan gaan in het naar uw hand zetten van de oplossing.
PHP At 5000 Requests Per Second: Hootsuite’s Scaling Story
The document describes Hootsuite's scaling journey from using Apache and PHP on one MySQL server to a microservices architecture using multiple technologies like Nginx, PHP-FPM, Memcached, MongoDB, Gearman, and Scala/Akka services communicating via ZeroMQ. Key steps included caching with Memcached to reduce MySQL load, using Gearman for asynchronous tasks, and MongoDB for large datasets. Monitoring with Statsd, Logstash and Elasticsearch was added for visibility. They moved to a service-oriented architecture with independent services to keep scaling their large codebase and engineering team.
Website Monitoring with Distributed Messages/Tasks Processing (AMQP & RabbitM...
Here are the key steps to integrate Facebook login into a Django website:
1. Register your website with Facebook Developers and create an app. This will give you an App ID and App Secret.
2. Install the Python social auth app: `pip install social-auth-app-django`
3. Add 'social_django' to INSTALLED_APPS in settings.py
4. Configure the Facebook backend:
```python
SOCIAL_AUTH_FACEBOOK_KEY = '<your app id>'
SOCIAL_AUTH_FACEBOOK_SECRET = '<your app secret>'
```
5. Add the Facebook login URL to your URLs:
```python
url(r'^social
Backend & Frontend architecture scalability & websockets
Scalable and interactive web-apps can be achieved easily with the help of Redis, NodeJS, RxJS and your favourite backend language and database.
Logging : How much is too much? Network Security Monitoring Talk @ hasgeek
This document discusses network logging and monitoring. It begins by introducing the speaker and their company which provides network analytics and protocol analysis products. It then covers the evolution of network monitoring from simple SNMP counters to today's approach of "logging everything". This includes storing various event logs, network flows, packets, and more. The challenges of large logging volumes, high speeds, and encrypted traffic are discussed. Network security monitoring tools aim to integrate all data types for comprehensive visibility and investigation. New techniques like streaming algorithms and sketching are needed to process high volume data streams. The document concludes by summarizing Trisul Network Analytics, an open source network monitoring platform that addresses these challenges through integration of logs, automated analysis tools, and an extensible
Monkey Server
Eduardo Silva is an open source engineer at Treasure Data working on projects like Fluentd and Fluent Bit. He created the Monkey HTTP server, which is optimized for embedded Linux and has a modular plugin architecture. He also created Duda I/O, a scalable web services stack built on top of Monkey using a friendly C API. Both projects aim to provide lightweight, high performance solutions for collecting and processing data from IoT and embedded devices.
Introduction to ZeroMQ - eSpace TechTalk
ØMQ (ZeroMQ) is an open-source library for high-performance asynchronous messaging. It was created by Martin Sústrik and Pieter Hintjens to enable cheaper and faster connections between distributed applications. ØMQ provides common messaging patterns like request-reply, publish-subscribe, and push-pull without a centralized message broker. It has bindings for many languages and can handle millions of messages per second with low latency. The presentation demonstrated ØMQ patterns and use cases, and discussed why it may have been better implemented in C instead of C++.
Node.js Course 2 of 2 - Advanced techniques
This document provides an agenda and overview of topics related to frameworks, tools, and best practices for building applications with Node.js. The topics covered include Sinatra/Connect-style frameworks, working with Express and Restify, persistence layers with ORMs, authentication with Passport, real-time communication with Socket.io, architecture patterns, debugging and performance, security, error handling, design patterns, and testing. Code examples are provided for basic routing in different frameworks.
Microservice architecture
Microservice architecture. Short intro into the world of microservices, the talk I gave in VilniusPHP meetup.
Full stack development
This document outlines the agenda for a presentation on full stack development. It begins with introductions and background on the presenter's experience. The presentation will cover the evolution of front-end development, typical front-end and back-end tasks, reasons for bugs on each side, and best practices for full stack development. It will also provide stories of issues that can arise when front-end and back-end teams do not communicate well. The goal is to demonstrate why understanding both sides is important for full stack developers.
Not my problem - Delegating responsibility to infrastructure
Slides for for my talk, appeared on Code-Europe Poznan 12.06.2018
(https://www.codeeurope.pl/en/speakers/yshay-yaacobi)
https://github.com/yshayy/not-my-problem-talk
https://github.com/Yshayy/not-my-problem-talk/blob/master/slides/demo.md
Javascript Update May 2013
The document summarizes the current state of JavaScript and its ecosystem. It covers JavaScript's history and evolution, an overview of the language, browser APIs and programming model, popular libraries like jQuery, MVC frameworks like Backbone, Node.js for backend development, variations like CoffeeScript, and emerging technologies on the cutting edge like ES6 and asm.js. It emphasizes that JavaScript has become the dominant language for both front-end and back-end web development.
Event driven systems
Event Driven Systems Tech Talk discusses event driven architectures and systems like Kafka, Akka, and Vert.x. Vert.x is introduced as an asynchronous and non-blocking toolkit for building reactive applications. It uses an event loop and event bus to communicate between components. Examples are given of how Vert.x handles failures through circuit breakers and timeouts, and provides load balancing and request/response messaging. Raven and a fraud detection system are presented as examples built on Vert.x handling large volumes of data through asynchronous and non-blocking processing.
Real World AngularJS recipes: beyond TodoMVC
This document summarizes a presentation on best practices for developing real world applications with AngularJS. It discusses topics like modularizing the app using modules, organizing source code into features, writing small focused controllers, using services for collaboration between controllers, when to use directives, authentication and authorization, logging, packaging for different environments, and testing Angular apps. References and resources are also provided.
Real World AngularJS recipes: beyond TodoMVC - Carlo Bonamico, Sonia Pini - C...
This document summarizes a presentation on best practices for developing real world applications with AngularJS. It discusses topics like modularizing the app into components, organizing source code, writing small controllers, using directives, authentication, logging, packaging, and testing Angular apps. References are provided for further reading on techniques like dependency injection, TypeScript, ES6, reusable components, Angular 2.0, Cucumber for BDD testing, and more.
NS3 Overview
The document provides an overview of the NS3 network simulator software organization and components. It describes that NS3 simulates nodes with network devices that transfer packets over channels and interface with different protocol layers. It also summarizes some of the main NS3 components like nodes, channels, routing protocols, traffic generators, helper classes and the typical structure of NS3 simulation scripts.
Nodejs
This document provides an overview of server-side JavaScript using Node.js in 3 sentences or less:
Node.js allows for the development of server-side applications using JavaScript and non-blocking I/O. It introduces some theory around event loops and asynchronous programming in JavaScript. The document includes examples of building HTTP and TCP servers in Node.js and connecting to MongoDB, as well as when Node.js may and may not be suitable.
Similar to Presentation (20)
Proactive monitoring tools or services - Open Source
Proactive monitoring tools or services - Open Source
PHP At 5000 Requests Per Second: Hootsuite’s Scaling Story
PHP At 5000 Requests Per Second: Hootsuite’s Scaling Story
Website Monitoring with Distributed Messages/Tasks Processing (AMQP & RabbitM...
Website Monitoring with Distributed Messages/Tasks Processing (AMQP & RabbitM...
Backend & Frontend architecture scalability & websockets
Backend & Frontend architecture scalability & websockets
Logging : How much is too much? Network Security Monitoring Talk @ hasgeek
Logging : How much is too much? Network Security Monitoring Talk @ hasgeek
Not my problem - Delegating responsibility to infrastructure
Not my problem - Delegating responsibility to infrastructure
Real World AngularJS recipes: beyond TodoMVC - Carlo Bonamico, Sonia Pini - C...
Real World AngularJS recipes: beyond TodoMVC - Carlo Bonamico, Sonia Pini - C...
Recently uploaded
ALGIT - Assembly Line for Green IT - Numbers, Data, Facts
Presentation from Ghazal Aakel and Eric Jochum at the GSD Community Stage Meetup on June 6th, 2024
E-commerce Development Services- Hornet Dynamics
For any business hoping to succeed in the digital age, having a strong online presence is crucial. We offer Ecommerce Development Services that are customized according to your business requirements and client preferences, enabling you to create a dynamic, safe, and user-friendly online store.
DDS-Security 1.2 - What's New? Stronger security for long-running systems
DDS Security Version 1.2 was adopted in 2024. This revision strengthens support for long runnings systems adding new cryptographic algorithms, certificate revocation, and hardness against DoS attacks.
What is Augmented Reality Image Tracking
Augmented Reality (AR) Image Tracking is a technology that enables AR applications to recognize and track images in the real world, overlaying digital content onto them. This enhances the user's interaction with their environment by providing additional information and interactive elements directly tied to physical images.
Neo4j - Product Vision and Knowledge Graphs - GraphSummit Paris
Dr. Jesús Barrasa, Head of Solutions Architecture for EMEA, Neo4j
Découvrez les dernières innovations de Neo4j, et notamment les dernières intégrations cloud et les améliorations produits qui font de Neo4j un choix essentiel pour les développeurs qui créent des applications avec des données interconnectées et de l’IA générative.
Using Query Store in Azure PostgreSQL to Understand Query Performance
Microsoft has added an excellent new extension in PostgreSQL on their Azure Platform. This session, presented at Posette 2024, covers what Query Store is and the types of information you can get out of it.
GraphSummit Paris - The art of the possible with Graph Technology
Sudhir Hasbe, Chief Product Officer, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
SMS API Integration in Saudi Arabia| Best SMS API Service
Discover the benefits and implementation of SMS API integration in the UAE and Middle East. This comprehensive guide covers the importance of SMS messaging APIs, the advantages of bulk SMS APIs, and real-world case studies. Learn how CEQUENS, a leader in communication solutions, can help your business enhance customer engagement and streamline operations with innovative CPaaS, reliable SMS APIs, and omnichannel solutions, including WhatsApp Business. Perfect for businesses seeking to optimize their communication strategies in the digital age.
Need for Speed: Removing speed bumps from your Symfony projects ⚡️
No one wants their application to drag like a car stuck in the slow lane! Yet it’s all too common to encounter bumpy, pothole-filled solutions that slow the speed of any application. Symfony apps are not an exception.
In this talk, I will take you for a spin around the performance racetrack. We’ll explore common pitfalls - those hidden potholes on your application that can cause unexpected slowdowns. Learn how to spot these performance bumps early, and more importantly, how to navigate around them to keep your application running at top speed.
We will focus in particular on tuning your engine at the application level, making the right adjustments to ensure that your system responds like a well-oiled, high-performance race car.
LORRAINE ANDREI_LEQUIGAN_HOW TO USE ZOOM
Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Microservice Teams - How the cloud changes the way we work
A lot of technical challenges and complexity come with building a cloud-native and distributed architecture. The way we develop backend software has fundamentally changed in the last ten years. Managing a microservices architecture demands a lot of us to ensure observability and operational resiliency. But did you also change the way you run your development teams?
Sven will talk about Atlassian’s journey from a monolith to a multi-tenanted architecture and how it affected the way the engineering teams work. You will learn how we shifted to service ownership, moved to more autonomous teams (and its challenges), and established platform and enablement teams.
原版定制美国纽约州立大学奥尔巴尼分校毕业证学位证书原版一模一样
原版一模一样【微信：741003700 】【美国纽约州立大学奥尔巴尼分校毕业证学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Hand Rolled Applicative User Validation Code Kata
Could you use a simple piece of Scala validation code (granted, a very simplistic one too!) that you can rewrite, now and again, to refresh your basic understanding of Applicative operators <*>, <*, *>?
The goal is not to write perfect code showcasing validation, but rather, to provide a small, rough-and ready exercise to reinforce your muscle-memory.
Despite its grandiose-sounding title, this deck consists of just three slides showing the Scala 3 code to be rewritten whenever the details of the operators begin to fade away.
The code is my rough and ready translation of a Haskell user-validation program found in a book called Finding Success (and Failure) in Haskell - Fall in love with applicative functors.
A Study of Variable-Role-based Feature Enrichment in Neural Models of Code
Understanding variable roles in code has been found to be helpful by students
in learning programming -- could variable roles help deep neural models in
performing coding tasks? We do an exploratory study.
- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
Oracle Database 19c New Features for DBAs and Developers.pptx
Oracle Database 19c New Features for DBAs and Developers. This video you can watch from my youtube channel at https://youtu.be/m-F-mZA3MkU
Energy consumption of Database Management - Florina Jonuzi
Presentation from Florina Jonuzi at the GSD Community Stage Meetup on June 06, 2024
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
Measures in SQL (SIGMOD 2024, Santiago, Chile)
SQL has attained widespread adoption, but Business Intelligence tools still use their own higher level languages based upon a multidimensional paradigm. Composable calculations are what is missing from SQL, and we propose a new kind of column, called a measure, that attaches a calculation to a table. Like regular tables, tables with measures are composable and closed when used in queries.
SQL-with-measures has the power, conciseness and reusability of multidimensional languages but retains SQL semantics. Measure invocations can be expanded in place to simple, clear SQL.
To define the evaluation semantics for measures, we introduce context-sensitive expressions (a way to evaluate multidimensional expressions that is consistent with existing SQL semantics), a concept called evaluation context, and several operations for setting and modifying the evaluation context.
A talk at SIGMOD, June 9–15, 2024, Santiago, Chile
Authors: Julian Hyde (Google) and John Fremlin (Google)
https://doi.org/10.1145/3626246.3653374
SWEBOK and Education at FUSE Okinawa 2024
Takashi Kobayashi and Hironori Washizaki, "SWEBOK Guide and Future of SE Education," First International Symposium on the Future of Software Engineering (FUSE), June 3-6, 2024, Okinawa, Japan
KuberTENes Birthday Bash Guadalajara - Introducción a Argo CD
Charla impartida en el evento de "KuberTENes Birthday Bash Guadalajara" para celebrar el 10mo. aniversario de Kubernetes #kuberTENes #celebr8k8s #k8s
Recently uploaded (20)
ALGIT - Assembly Line for Green IT - Numbers, Data, Facts
ALGIT - Assembly Line for Green IT - Numbers, Data, Facts
DDS-Security 1.2 - What's New? Stronger security for long-running systems
DDS-Security 1.2 - What's New? Stronger security for long-running systems
Neo4j - Product Vision and Knowledge Graphs - GraphSummit Paris
Neo4j - Product Vision and Knowledge Graphs - GraphSummit Paris
Using Query Store in Azure PostgreSQL to Understand Query Performance
Using Query Store in Azure PostgreSQL to Understand Query Performance
GraphSummit Paris - The art of the possible with Graph Technology
GraphSummit Paris - The art of the possible with Graph Technology
SMS API Integration in Saudi Arabia| Best SMS API Service
SMS API Integration in Saudi Arabia| Best SMS API Service
Need for Speed: Removing speed bumps from your Symfony projects ⚡️
Need for Speed: Removing speed bumps from your Symfony projects ⚡️
Microservice Teams - How the cloud changes the way we work
Microservice Teams - How the cloud changes the way we work
A Study of Variable-Role-based Feature Enrichment in Neural Models of Code
A Study of Variable-Role-based Feature Enrichment in Neural Models of Code
Oracle Database 19c New Features for DBAs and Developers.pptx
Oracle Database 19c New Features for DBAs and Developers.pptx
Energy consumption of Database Management - Florina Jonuzi
Energy consumption of Database Management - Florina Jonuzi
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...
KuberTENes Birthday Bash Guadalajara - Introducción a Argo CD
KuberTENes Birthday Bash Guadalajara - Introducción a Argo CD
Presentation
- 1. Event processing with Node.js and RabbitMQ by Zlatko Duric
- 2. Disclaimer (AKA about me) ● Experience – Node.js? Lots – NoSQL? Lots. – Messaging? Little ● Backend Developer at ThinxNet.com (http://thinxnet.com/#jobs)
- 3. Connected cars? ● Hardware device ● Various sensors – lots of data ● “Cloud” processing
- 4. Ready to serve. How? ● Event collection and processing ● Webapp, mobile app ● Backoffice and support apps, notification services etc. ● Reporting, third party software integration etc ● REST approach: – Lots of requests – Parsing of data is blocking – Avoid choking devices – Communication overhead – Error management
- 5. What service? Microservice! ● Redis PUBSUB ● ZeroMQ, MQTT, AMQP ● RabbitMQ, ActiveMQ
- 6. About RabbitMQ ● Messaging broker based on AMQP protocol ● Platform/language independent ● Extensible (Erlang) ● Persistent message queues ● Node.js drivers (node-amqp, rabbit.js...)
- 7. Hello world
- 8. Exchanges and topics ● Publisher and subscriber. Simple as that. ● Get message, ack or reject (nack) it. ● Subscribers listen on a queue ● Publishers talk to an exchange ● Exchange routes to queues based on topics
- 9. Example
- 10. Channels and connections ● 1 node process = 1 connection ● Many channels, share same connection
- 11. PUBSUB ● Simple PUBSUB, as used elsewhere ● All listeners get the same message ● Suboptimal
- 12. Example
- 13. PUSH-PULL/WORKER ● Round-robin distribution ● Worker socket.ack() is explicit (rabbit.js driver) ● Prefetch sets the number of msgs received ● Problem: concurrent/sequential modification?
- 14. Example
- 15. Content-based routing ● Erlang extensions? Not standard. ● App-side: – Keep internal mini-queue – Do not ack a msg if it's not first on local queue – Hold internal messages based on internal “topic”, ie “user.<ID>.save” - hold msgs for that user – Item.update() instead of item.save() ● Gets nasty fast, should minimize these scenarios
- 16. Example
- 17. REST API with MQ ● REQUEST/REPLY for immediate responses ● Other patterns for direct access – REST API just forwards the message – replies will go by other route ● Pub/sub is easy!
- 18. Example
- 19. Error handling ● Uncaught exceptions are covered ● Retry logic is simplified – push incomplete messages to a 'fixer' queue, requeue failed jobs or when no resources ● Dedicated error handling
- 20. Example
- 21. Error handling ● Uncaught exceptions are covered ● Retry logic is simplified – push incomplete messages to a 'fixer' queue, requeue failed jobs or when no resources ● Dedicated error handling
- 22. Testing ● No good known mocks, please help ● RabbitMQ always on on Jenkins machine ● Test handlers directly
- 23. Buzzwords index ● Cloud ● Connected car ● Microservice ● Patterns :)
- 24. Info sources ● https://www.rabbitmq.com/ ● http://www.squaremobius.net/rabbit.js/ ● http://www.manning.com/videla/
- 25. Note to self ● Thank the audience for patience ● Invite audience for a discussion and questions