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New York Times Lab Introduces Visual Stream Processing Tool

by Michael Hausenblas on  Apr 01, 2014 1

The New York Times R&D Lab has released streamtools, a general purpose, graphical tool for dealing with streams of data, under Apache 2 license.

Akka Actors vs. Java EJBs from a High-Level Concurrency Perspective

by Jan Stenberg on  Feb 27, 2014 1

There are both commonalities and some differences when comparing architectural principles and coding styles in Akka Actors and Java EE 7 Enterprise JavaBeans, specifically stateless session beans and JMS message-driven beans, Dr Gerald Loeffler concludes in a recent introductory talk when explaining and comparing the three approaches from a high-level concurrency view.

CQRS Framework Axon 2.1 with Increased Event Handler Support and Performance Improvements

by Jan Stenberg on  Feb 22, 2014

Version 2.1 of CQRS framework Axon supports annotations and ordering of event handlers, a new conflict resolution together with performance improvements. The recently released version also adds compatibility with OSGi.

Greg Young on Using Complex Event Processing

by Jan Stenberg on  Jan 29, 2014 4

Complex Event Processing, CEP, can be very useful for problems that have to do with time e.g. querying over historical data when you want to correlate things that have happened at different times, Greg Young explained in a recent presentation.

Vaughn Vernon: Reactive Domain-Driven Design

by Jan Stenberg on  Nov 19, 2013 1

Vaughn Vernon, author of Implementing Domain-Driven Design, recently talked about using Scala and the Actor Model implementation Akka together with Doman-Driven Design as a means to remove some of the architecture overhead typically found in event-driven or hexagonal architectures.

Pivotal's Reactor Goes GA

by Dan Woods on  Nov 13, 2013

This week, Pivotal released version 1.0 of its project Reactor for general availability. Reactor provides low-level abstractions for an event-driven, reactive programming model, and is a component member of the Spring IO Platform in its "IO Foundation" layer.

Implementing Hexagonal Architecture using Life Preserver and Spring Framework

by Jan Stenberg on  Aug 31, 2013

Russ Miles recently shared some thoughts and ideas about the needs for adaptability in a system and how his implementation of the Hexagonal Architecture can help in achieving this. He used a Java and Spring based application to exemplify how such a system can be implemented.

Event Store 2.0 Released with Security Support and the Projections Library in Beta

by Jan Stenberg on  Jul 27, 2013

Version 2.0 of the Event Store, (an Event Source based persistence engine), was released last week with support for security, allowing for lock down of the Event Store and setting up Access Control Lists on event streams. The Projections library is now in beta and more documentation has been added.

NServiceBus 4.0 with support for RabbitMQ and ActiveMQ

by Jan Stenberg on  Jul 13, 2013 1

Version 4.0 of NServiceBus, a service bus for .NET, has just been released with support for RabbitMQ and ActiveMQ in addition to MSMQ. Support for using database tables as queues has also been added, and performance for the MSMQ transport has been significantly improved. According to Udi Dahan, the founder of NServiceBus, this is the biggest release ever.

Greg Young on Documents and Processes as an Alternative to Events

by Jan Stenberg on  Jun 18, 2013

Not all systems are based on events or facts. In some problem spaces events make complete sense; they are about facts that are happening over periods of time. But a lot of systems are instead focused on information that flow through a process, Greg Young explained at DDD Exchange Day in London last week, using handling of a mortgage application inside a bank as an example.

Yahoo! Open Sources Storm on Hadoop

by Boris Lublinsky on  Jun 17, 2013 2

Last week Yahoo! announced the open source release of Storm on Hadoop cluster. This implementation enables Storm applications to utilize the computational resources of a Hadoop cluster along with accessing Hadoop’ storage resources such as HBase and HDFS.

Vaughn Vernon on the Actor Model and Domain-Driven Design

by Jan Stenberg on  Jun 16, 2013 1

To take advantage of the great concurrency opportunities the new multi-core machines gives us we should use a programming model that helps us achieve this, and the Actor model gives us a number of tools for doing that, Vaughn Vernon stated at this year’s DDD Exchange Day in London.

Build Simplicity into a System with Simple Event-Driven Components

by Jan Stenberg on  Jun 06, 2013 1

Use events for interactions between small business components to bring simplicity to a system’s architecture, Russ Miles suggests in a recent presentation about simple event-driven components, as a follow-up on his talk a month earlier where he laid the architectural ground for his ideas about simplicity.

New C# based CQRS Tutorial available

by Jan Stenberg on  May 31, 2013

A new CQRS, Command Query Responsibility Separation, C# based Starter Kit to help developers get up and running with CQRS on .NET has been developed, not as a framework, but as a tutorial for developers interested in learning about CQRS, and as a possible starting ground for a CQRS based system.

Events bring Simplicity to a System's Architecture

by Jan Stenberg on  Apr 29, 2013

Using events for interactions between small business components can bring simplicity to a system’s architecture, Russ Miles explained in a presentation last week talking about Architectural Simplicity through Events.

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