Home » Author Archives: Konrad Garus

Author Archives: Konrad Garus

Rapid Development with Hibernate in CQRS Read Models

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In this post I’m going to share a few tricks for using Hibernate tooling in CQRS read models for rapid development. Why Hibernate? Hibernate is extremely popular. It’s also deceptively easy on the outside and fairly complex on the inside. It makes it very easy get started without in-depth understanding, misuse, and discover problems when it’s already too late. For ...

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Persistence in CQRS Read Models

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One of the biggest benefits of CQRS is the ability to implement multiple read models. Business rules and the domain model are safe, clean and isolated over in the write model. They are not getting in the way of view models, which can selectively pick the pieces they are interested in, freely reshape them, and do everything in a way ...

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Writing an Event-Sourced CQRS Read Model

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Discussions about event sourcing and CQRS seem to usually focus on the overall system architecture or various flavors of domain-driven design in CQRS context. However, the read models are often neglected, even though there are some interesting considerations on this side as well. In this post we’re going to present a sample implementation of populating a view model by consuming ...

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Achieving Consistency in CQRS with Linear Event Store

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In a recent project involving an event-sourced CQRS system, we decided to do some things that seem somewhat unusual compared to solutions mostly talked about. However, they let us achieve some nice properties that would be hard (if possible at all) otherwise. Event Store as Regular Table We decided to implement the event store as a regular table in an ...

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Validating Class/Package Dependencies with Classycle

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Classycle is a very nice analyzer and dependency checker for class and package dependencies. It lets you define package groups (components, layers) and express unwanted dependencies such as cycles, or dependencies between particular packages. For example you can specify that you want no package cycles and no dependencies from com.foo.domain.* on com.foo.api.*. All using a very human-friendly, concise format. Then ...

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Walking Recursive Data Structures Using Java 8 Streams

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The Streams API is a real gem in Java 8, and I keep finding more or less unexpected uses for them. I recently wrote about using them as ForkJoinPool facade. Here’s another interesting example: Walking recursive data structures. Without much ado, have a look at the code:             class Tree { private int value; private ...

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Java 8 Streams API as Friendly ForkJoinPool Facade

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One of features I love the most about Java 8 is the streams API. It finally eliminates pretty much all loops from the code and lets you write code that is so much more expressive and focused. Today I realized it can be used for something else: As a nice front-end for the ForkJoinPool. Problem: Executors Boilerplate Let’s say we ...

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Careful With Native SQL in Hibernate

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I really like Hibernate, but I also don’t know a tool that would be nearly as powerful and deceptive at the same time. I could write a book on surprises in production and cargo cult programming related to Hibernate alone. It’s more of an issue with the users than with the tool, but let’s not get too ranty. So, here’s ...

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ClojureScript Routing and Templating with Secretary and Enfocus

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A good while ago I was looking for good ways to do client-side routing and templating in ClojureScript. I investigated using a bunch of JavaScript frameworks from ClojureScript, of which Angular probably gave the most promising results but still felt a bit dirty and heavy. I even implemented my own routing/templating mechanism based on Pedestal and goog.History, but something felt ...

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