Scalable Java Application Development on AWS
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Presentation from JEEConf conference (Kiev, May 2011) about best practices in scalable Java application development on AWS.
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Ride the database in JUnit tests with Database RiderMikalai Alimenkou For a long time DB related testing in Java world has been a real pain and most developers tried to reduce number of such tests as much as possible. With good in-memory database implementations like H2, schema migration solutions like Liquibase or Flyway, containerization with libraries like TestContainers, database management is now much simpler. But test data management is still a pain. Some developers use SQL dumps, others insert data via JPA/JDBC or rely on prepared data sets. Good old DBUnit may be a good option, but it is not so developer friendly and not adopted well for modern annotations driven development style. Database Rider closes the gap between modern Java development environment and DBUnit, bringing DBUnit closer to your JUnit tests, so database testing will feel like a breeze. In addition to flexible data sets management this library provides other useful features: programmatic data sets definition, leak hunting, data sets export, constraints management, etc. As contributor and loyal user for many years, I would like to share my experience with Database Rider and demonstrate how to make database testing a fun again!
Wastful waste or why everything is so slow in development
Wastful waste or why everything is so slow in developmentMikalai Alimenkou I think almost everybody experienced cases when things are moving very slowly in IT companies or teams. You have many people, talented engineers, Agile process and development speed is still below expectations. We try to focus on performance and efficiency last 10 years, improving our practices and tools. But we are still there in terms of speed when they are applied to real life cases. How is it possible? In this talk we will review the concept of waste circles and understand what are the main sources of time waste in development process. This concept would help you to check your processess, focus on right things and achieve much better results in your organization or team.
Hexagonal architecture with Spring Boot
Hexagonal architecture with Spring BootMikalai Alimenkou The document discusses implementing a hexagonal architecture and domain-driven design approach with Spring Boot. It promotes starting with use cases and domain context, using entities and value objects to model the domain, and aggregates for complex relationships. It also advocates an ports and adapters approach using Spring Boot modules like Spring MVC, Spring Data, and Spring Messaging to connect business logic to databases, queues, APIs and other external services through adapters. The summary emphasizes changing one's perspective to focus on the business logic and domain model first and using existing Spring Boot features to build the technical implementation around it.
Wastful waste or why everything is so slow in development
Wastful waste or why everything is so slow in developmentMikalai Alimenkou I think almost everybody experienced cases when things are moving very slowly in IT companies or teams. You have many people, talented engineers, Agile process and development speed is still below expectations. We try to focus on performance and efficiency last 10 years, improving our practices and tools. But we are still there in terms of speed when they are applied to real life cases. How is it possible? In this talk we will review the concept of waste circles and understand what are the main sources of time waste in development process. This concept would help you to check your processess, focus on right things and achieve much better results in your organization or team.
DevOps checklist or how to understand where is your team in DevOps landscape ...
DevOps checklist or how to understand where is your team in DevOps landscape ...Mikalai Alimenkou DevOps become a buzzword in a last few years. Several companies, development and product teams have achieved quite impressive results in this area making cultural changes, transforming their processes and practices, introducing new roles, tools and techniques.
Do you think is achievable for you team or it’s still a bunch of drama? There is no common approach for measuring achievements and understanding how much DevOps’ich the current team/company is. In this talk I will provide attendees with basic checklist to start with and some reliable tools/techniques to monitor progress of “DevOps transformation”.
DevOps checklist or how to understand where is your team in DevOps landscape
DevOps checklist or how to understand where is your team in DevOps landscapeMikalai Alimenkou DevOps is a hot topic during last several years. Some companies, teams and products have achieved quite impressive results in this area making cultural changes, transforming their processes and practices, introducing new roles, tools and techniques. At the same time there is no common approach for measuring achievements and understanding “how DevOps” the current team/company is. In this talk I will provide attendees with basic checklist to start with and some reliable tools/techniques to monitor progress of “DevOps transformation”.
Практические трудности в разработке Медкарты для целой страны
Практические трудности в разработке Медкарты для целой страныMikalai Alimenkou Почти год мы в Whirl Software разрабатываем систему Медкарта в масштабе целой страны. За это время мы столкнулись с множеством интересных сложностей и проблем, часть из которых успешно победили, а для некоторых хорошего решения до сих пор не найдено. В этом докладе мы поделимся накопленным практическим опытом и некоторыми техническими решениями, которые могут быть полезны в рамках разработки электронных медицинских систем.
Hexagonal architecture with Spring Boot [EPAM Java online conference]![Hexagonal architecture with Spring Boot [EPAM Java online conference]](https://cdn.slidesharecdn.com/ss_thumbnails/hexagonalarchitecturewithspringboot-180925151506-thumbnail.jpg?width=560&fit=bounds)
Hexagonal architecture with Spring Boot [EPAM Java online conference]Mikalai Alimenkou Nowadays traditional layered monolithic architecture in Java world is not so popular as 5-10 years ago. I remember how we wrote tons of code for each layer repeating almost the same parts for every application. Add unit and integration testing to understand how much time and efforts has been spent on repeatable work. All cool ideas around DDD (domain driven design) and Hexagonal Architecture was just a nice theory because reality hasn’t allow us to implement it easily. Even Dependency Injection with Spring framework was completely focused on traditional layered approach, not even talking about JavaEE platform.
Today we have Spring Boot ecosystem covering most of our needs for integration with almost all possible technologies and microservices architectural trend, enabling completely new approach to build Java applications around domain model. It is so natural to build Java domain-oriented services and connect them with external world using ports and adapters, that Hexagonal Architecture is almost enabled by default. You just need to switch your way of thinking…
Bro, manage test data like a pro! [QA Fest 2018]![Bro, manage test data like a pro! [QA Fest 2018]](https://cdn.slidesharecdn.com/ss_thumbnails/bromanagetestdatalikeapro-180922193659-thumbnail.jpg?width=560&fit=bounds)
Bro, manage test data like a pro! [QA Fest 2018]Mikalai Alimenkou This document provides guidance on effectively managing test data for software testing. It discusses 6 approaches to preparing test data: 1) using the user interface, 2) inserting data via API calls, 3) direct SQL insertion into the database, 4) using data sets with DBUnit, 5) versioned data dumps, and 6) reusing production data. The key recommendations are to choose the approach that best fits the system under test, speed up test data management with APIs, reuse live data when possible, and mix strategies as needed to build reliable test cases.
Agile antipatterns: review after 10 years of practice
Agile antipatterns: review after 10 years of practiceMikalai Alimenkou Вот уже более 10 лет Agile движение шагает по Украине и стучится практически в каждую компанию. Но приносят ли новые процессы, принципы и практики реальную практическую пользу? Получается ли изменить к лучшему команды, проекты, компании? Я в роли консультанта за эти 10 лет поработал с более чем 100 компаниями, поэтому повидал много хорошего и плохого. В данном докладе хочется пробежаться по основным проблемам, сложностям и анти-паттернам в переходе отечественных компаний на "Agile рельсы". Мы рассмотрим какие практики не очень хорошо приживаются, от чего страдает большинство команд, какие основные препятствия встречают на своем пути и как умудряются их обходить. Я надеюсь, доклад поможет зародиться множеству интересных дискуссий.
Hexagonal architecture with Spring Boot
Hexagonal architecture with Spring BootMikalai Alimenkou Nowadays traditional layered monolithic architecture in Java world is not so popular as 5-10 years ago. I remember how we wrote tons of code for each layer repeating almost the same parts for every application. Add unit and integration testing to understand how much time and efforts has been spent on repeatable work. All cool ideas around DDD (domain driven design) and Hexagonal Architecture was just a nice theory because reality hasn’t allow us to implement it easily. Even Dependency Injection with Spring framework was completely focused on traditional layered approach, not even talking about JavaEE platform.
Today we have Spring Boot ecosystem covering most of our needs for integration with almost all possible technologies and microservices architectural trend, enabling completely new approach to build Java applications around domain model. It is so natural to build Java domain-oriented services and connect them with external world using ports and adapters, that Hexagonal Architecture is almost enabled by default. You just need to switch your way of thinking…
Bro, manage test data like a pro!
Bro, manage test data like a pro!Mikalai Alimenkou Almost any application or software system manages data. It is hard to imagine test automation that is not affected by this fact. There are many differenct approaches how to prepare system under test, providing predefined test data: use application UI, invoke API methods, run business logic directly, access DB from test scenarios, etc. In this talk we will review most of existing approaches, starting from the easiest and the most popular ones and finishing with really tricky ways to manage your test data for large distributed systems. There is no ideal solution for every case or silver bullet, but I hope your toolset will become wider after visiting this talk.
Бытовая классификация тестировщиков с точки зрения разработчика
Бытовая классификация тестировщиков с точки зрения разработчикаMikalai Alimenkou Тестировщики часто говорят о противостоянии и конфликтах с разработчиками. Но ведь есть команды, где все живут в мире и согласии. Видимо что-то тут не так? Я хочу поговорить о том, как тестировщиков видят сами разработчики. В докладе будет проведена забавная классификация. Кроме известного всем тестировщика-обезьянки будут представлены тестировщик-муха, тестировщик-нацист, тестировщик-панда и многие другие герои. Высможете лишний раз задуматься над тем, как вас видят со стороны и, возможно, изменить ситуацию к лучшему.
Доклад будет также полезен менеджерам проектов и лидерам команд. Вы сможете быстрее распознавать те или иные шаблоны поведения тестировщикови принимать меры по повышению уровня командной работы. Приходите, будет интересно!
Code Review tool for personal effectiveness and waste analysis
Code Review tool for personal effectiveness and waste analysisMikalai Alimenkou Usually it is hard to analyze personal effectiveness and detect wastes in development process because developer’s work decomposition is not transparent and available for analysis. As a good sample of ineffective process imagine developer, who spends 1 day on task implementation and then reimplements it several times according to code review notes during next 2 days. Or another developer, who is waiting for code review during 2 days, switching context to other tasks, finally gets notes and switches back to initial task, trying to refresh all details in his head. And so on and so forth…
Code review tool usage helps to aggregate lots of useful information about any code change at any stage (static analysis, code review, rework, acceptance, integration into main branch). In this talk I’m going to demontrate how this information could be used for detailed analysis of development effectiveness and wastes detection. Based on mentioned analysis you could implement many improvements for your development process and then measure their success.
Funny stories and anti-patterns from DevOps landscape
Funny stories and anti-patterns from DevOps landscapeMikalai Alimenkou During last several years DevOps became strong buzzword used almost in every project, team and company. But almost everywhere it is used in very funny and strange context. For example, existing ops guys are renamed to DevOps just to sell them to the client for more money. Or DevOps is used as new job title for some magically powerful person who is able to operate cloud environment and modern infrastructure related tools, leading team of old school ops and participating in management meetings. In this talk I’m going to review all different anti-patterns and bad practices in DevOps landscape using stories from my personal experience as Delivery Manager and independent consultant.
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Scalable Java Application Development on AWS
- 1. Scalable Java Application Development on AWSMikalai Alimenkouhttp://xpinjection.com21.05.2011
- 2. BackgroundJava Technical Lead/Scrum Master at Zoral Labs6+ years in software development4+ years of working by Agile methodologiesExpert in Agile engineering practicesFounder and coachat XP Injection (http://xpinjection.com)Organizer of Selenium Camp and JEEConf conferences
- 3. NoFuture!
- 5. Interesting startupCompletely in JavaCustomer wants to use AWSNew Project Arrived
- 7. Why Java?Runs everywhereFull technological stackLots of tools for scalabilityMany frameworks for cloud development
- 10. Easy and reliable server configuration with AMINo work for system administratorAny number of servers availableNo waits for hardwareMore experimenting and testingEasy security modelHappiness…
- 11. Look Ma, No Hands!
- 15. What I Have for Such Money?Testing ServerDB ServerProduction Server
- 16. Ways to Save MoneyGood and responsible team Reuse instances when possible rounding usage timeRelease instances when not more neededMonitor and control running instancesUse reserved instances for continuously running jobs
- 18. Elasticfox – my superhero!
- 19. Hourly payment is invisible
- 21. Same type of machine, but different performance
- 22. Instance not immediately available
- 23. Images creation require “magical” skills
- 24. No multicast messagingRetry policies everywhereTimeouts for all operationsAutomatic recoveryEverything is Unreliable
- 25. EBS Quick IntroductionRaw data volumes from 1GB to 1TBReplicated automaticallySnapshots to S3May be used with different instances
- 26. EBS Architecture
- 28. EBS Cost ModelNot so cheapAdditional costs for snapshots in S3
- 29. EBS != Hard DriveSlow for time critical tasksBottleneck for Lucene indexing and DBUse parallel EBS volumesSeparate data storage between EC2 instancesDon’t use RDSLimited to 1TBVirtual RAIDData distribution
- 31. Load Balancing with JMSJMS is very scalable and flexibleJMS costs are less than SQS (Simple Queue Service)Configurable load balancing
- 33. Self-Distributed SystemHost manager works via Java AWS API
- 35. Code distribution to EC2 hostsReduce Coupling to AWS
- 36. ConclusionsAWS is great for startups or research projectsAWS increases development speed in timesIt is easy to create scalable and highly available Java application on AWSDevelopment, testing and production may be done on AWSAWS save development costsAWS support Agile developmernt approaches
- 37. Any questions?