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CQRS

CAP Theorem, CQRS and Eventually Consistent

First, if you haven’t heard of Eric Brewer’s CAP theorem, it basically states that you can must choose two of three: Consistency Availability Partition Tolerance CQRS doesn’t solve CAP issues, however it allows you to decide independently what is important on both read and write side. For example, you could assume a systems would be ACID (Atomic, Consistent, Isolated, Durable) compliant on the write/domain site and BASE (Basic Availability, Soft-State, Eventually Consistent) on the read side. Eventual consistency is something that requires a change of mindset.  Because of our heavy use in ACID compliant databases, thinking about possibly having stale data blows our mind. There… Read More »CAP Theorem, CQRS and Eventually Consistent

Service Bus for Windows Server

Move over MSMQ, Service Bus for Windows Server was recently released.  Apparently it has been for awhile now (Oct 2012 release).  I’m just late to the party I guess. Service Bus 1.0 was designed to allow for enterprise messaging capabilities in a Windows Server-based environment.  It enables you to build, test, and run loosely-coupled, message-driven applications in self-managed environments and on developer computers.  The two primary features are Service Bus Queues and Service Bus Topics and Subscriptions. Service Bus Queues offer reliable message storage and retrieval with a choice of protocols and APIs. Use Service Bus queue in your application to provide load leveling by having the… Read More »Service Bus for Windows Server

Event Sourcing: Eric Evans Interviews Greg Young

I follow Eric Evans (@ericevans0) and Greg Young (@gregyoung) on twitter.  I really respect their opinion and knowledge. Eric tweeted about an interview he did with Greg over 5 years ago about Event Sourcing.  It’s great to hear Greg describe how Event Sourcing fits with DDD concepts.  This is video is one of the first Event Sourcing + DDD talks that I’m aware of.   I highly recommend checking  it out. http://www.infoq.com/interviews/Architecture-Eric-Evans-Interviews-Greg-Young If you are new to Event Sourcing, here is a snippet from Martin Fowler article. Capture all changes to an application state as a sequence of events. We can… Read More »Event Sourcing: Eric Evans Interviews Greg Young