Knoldus Blogs

Concepts of CQRS

June 19, 2018August 9, 2018Architecture, Database, event, Microservices, Tutorialcqrs, Database, Design, event sourcing, events, Introduction, learning, Microservice architecture design, technology

Reading Time: 3 minutes In the previous blog, we have learnt what Event Sourcing is. Moving forward, we will dive into the concepts of CQRS, understanding its meaning, why is it required and its advantages. CQRS Pattern CQRS stands for Command Query Responsibility Segregation. As the name suggests, we split the application in two parts: Command-Side and Query-Side. Now one will ask what this command and query means? Okay, Continue Reading

Introduction to Event Sourcing

June 13, 2018August 9, 2018Architecture, Database, Microservices, Tutorialcqrs, Database, event sourcing, Introduction, learning, snapshots, technology

Reading Time: 3 minutes Have you ever come across the terms Event Sourcing and CQRS? This blog is a good start to gain basic knowledge about the two. Here, we will learn what is Event Sourcing? And what are the benefits of having an event sourced application? CQRS will be covered in the next blog. What is Event Sourcing? Event sourcing is the practice of capturing all changes as Continue Reading

DATA PERSISTENCE IN LAGOM

November 15, 2017August 9, 2018Cassandra, Database, Microservices, NoSql, ScalaCassandra, cqrs, data persistence, Database, event sourcing, lagom, lagom persistence, persistent entity, scala

Reading Time: 5 minutes Are you finding it difficult to understand lagom persistence? Don’t worry because help is right here. In this blog, we will learn about lagom persistence with the help of a simple application and also discuss its theoretical aspects. Before we begin, make sure you know about Event Sourcing and CQRS. You can read about it in details from this link . Choosing a database When Continue Reading

Lagom Framework: The Legacy WordCount Example

March 27, 2017March 27, 2017Big Data and Fast Data, Microservices, Scalacqrs, event sourcing, lagom, Lagom Architecture, wordcount

Reading Time: 3 minutes What is Lagom? Lagom is an open source micro-service framework, built with Akka message-driven runtime and Play web framework and finally light bend service orchestration. Mixing all these technologies abstracts away the complexities of building, running, and managing microservice architectures. Lagom is a Swedish word meaning “just the right amount”. Often, when people talk about microservices, they focus on the micro part of the name, Continue Reading

Building Microservices Architecture Based Enterprise Applications in Java Using Lagom – Part I

February 13, 2017August 13, 2018Akka, Java, Microservices, ScalaAkka, Cassandra, ddd, doamin drivern design, domain specific language, enterprise application, event sourcing, javaee, lagom, Microservices, technology

Reading Time: 5 minutes As we know, now days, most of the enterprise applications design as a “Microservices Architecture” because of scalability, sharding, loosely-coupling and many others reasons are there. On the other hand JavaEE help us for building an Enterprise Applications. As we know, Java help us for building a good applications, but with JavaEE monolithic approach our applications are not scalable as compare to microservices. That’s why, Continue Reading

Event Sourcing with Eventuate

February 13, 2017August 8, 2018akka-http, Cassandra, Scalaevent sourcing, eventuate

Reading Time: < 1 minute Hi all,Knoldus had organized an hours session on 3rd February 2017 at 4:00 PM. Topic was Event Sourcing with Eventuate. Many enthusiasts joined and learned from the session. I am sharing the slides of the session here. Please let me know if you have any question related to linked slides. you can also watch the video on youtube : You can find complete code Continue Reading

Scala-IOT : Introduction to Internet Of Things.

August 7, 2016August 28, 2016IOT, ScalaApache Spark, Event Processing, event sourcing, internetOfthings, IOT, linux, linux enthusiast, mqtt, raspberryPi, raspberryPi3, scala, Spark

Reading Time: 4 minutes Recently this word IOT is gaining lot of popularity. And we see a lot of news on it like the world is moving towards IOT , and its the next big thing and smart cities are no longer a fiction and many other news like that. As we are also a part of this world 😉 so we start digging into this and start exploring Continue Reading

CQRS in a jiffy!

January 31, 2016January 31, 2016Scalaakka persistence, cqrs, event sourcing

Reading Time: < 1 minute Segregate operations that read data from operations that update data by using separate interfaces. This pattern can maximize performance, scalability, and security; support evolution of the system over time through higher flexibility; and prevent update commands from causing merge conflicts at the domain level. The term sounds heavy, but the concept is not. At least, this is what we discovered at the end of our regular Continue Reading