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Summary of CRDTs
In this article I am going to introduce you to CRDTs, or Conflict-Free Replicated Data Types. You will see under what conditions CRDTs might be useful, why you might want to use such a data type, what...
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Building a Reactive Process Manager, Twice
On February 24, 2015, I delivered a presentation by this title to a meetup in the Netherlands. The group name is DomCode, and we had a packed house of more than 80 attendees. This topic not only drew a...
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Number 9: The Price of Akka Reliability
In my previous post I introduced you to Number 9, a simple extension to Akka that supports reliable message delivery. I completed that post by discussing the trade offs of using Akka Persistence and...
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Making Akka Commands and Events Deliver Reliably
This post has been a long time in coming. I feel that it is high time to write about this because so many developers struggle with making message delivery with Akka a reliable procedure, and...
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The Ideal Domain-Driven Design Aggregate Store?
At the 2014 DDD eXchange in NYC, a park bench discussion developed around storing Aggregates. The consensus among the DDD leadership was against Object-Relational Mapping (ORM) and the desire to come...
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An Approach to Composing Aggregate Boundaries
I was asked if I could provide any guidelines to composing Aggregate boundaries. One way of looking at the problem is how to break up large-cluster Aggregates and still maintain consistency boundaries...
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Modeling Aggregates with DDD and Entity Framework
For everyone who has read my book and/or Effective Aggregate Design, but have been left wondering how to implement Aggregates with Domain-Driven Design (DDD) on the .NET platform using C# and Entity...
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Effective Aggregate Design
This is a three-part series about using Domain-Driven Design (DDD) to implement Aggregates. Clustering Entities and Value Objects into an Aggregate with a carefully crafted consistency boundary may at...
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Dealing with Device Reads Using Akka
You have a device monitor actor. It must poll the device every time an internal expires. When data starts flowing, it flows a lot. Sometimes, however, the device will not have readable data for long...
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DDD with Scala and Akka Revisited
There were a number of issues with the code I wrote in the post Using Scala and Akka with Domain-Driven Design. I am addressing those problems in this post and cleaning up the code. The good thing...
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Using Scala and Akka with Domain-Driven Design
If you’ve been following my theme for a while I’ve spent a considerable amount of effort promoting Scala and Akka for use when Implementing Domain-Driven Design. Few seem to share my vision of a...
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Naming “Shadow” Concepts Across Bounded Contexts
I was asked why the concept named Tenant is used in all three Bounded Contexts for the example code for my book, Implementing Domain-Driven Design. Is it because a Tenant is the exact same thing in all...
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EAI Patterns with Actor Model: Message Channel
After a discussion of all those fancy doodahdah filters, routers, and buses, we are back to the plain old Message Channel. Yes, I did skip the Process Manager. We will get back to it, but for now it...
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EAI Patterns with Actor Model: Message Bus
You have a number of disparate business systems, from purchased commodity applications, to custom developed applications that help achieve competitive advantage, to those of integrating business...
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EAI Patterns with Actor Model: Message Expiration
If it is possible for a given message to become obsolete or in some way invalid due to a time laps, use a Message Expiration to control the timeout. While we have already dealt with the process...
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EAI Patterns with Actor Model: Claim Check
When you need to break up a composite message into smaller parts, but provide access to any of the parts on demand, use a Claim Check. Consider the Claim Check a unique identifier used to store and...
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EAI Patterns with Actor Model: Resequencer
At this point we’ve covered a number of Message Routers in addition to some less complex, but essential, messaging patterns. With regard to my discussion of Request-Response, Ramesh Mandaleeka asked a...
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EAI Patterns with Actor Model: Scatter-Gather
We’ve actually already stepped through one implementation of Scatter-Gather. This was the combination of Recipient List and Aggregator, which provides the first of two Scatter-Gather variants. The...
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EAI Patterns with Actor Model: Aggregator
The Recipient List example didn’t demonstrate how the PriceQuote replies are assimilated by the MountaineeringSuppliesOrderProcessor. To correlate PriceQuote replies to the original RequestForQuotation...
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First Ever DDD eXchange in NYC with Discount
Join me and Skills Matter in NYC on September 17, 2013, for the DDD eXchange. The event is from 7:00 pm – 10:00 pm. I will be there with Eric Evans for the first ever DDD eXchange in DUMBO, New York...
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