jBITs

On my day-job as a consultant for GROUP9  we had an interesting discussion on how to handle validations across micro-services. Let's look at this in the context of a fictionalized example. Example: amazon selling for other companies The case we were discussing was the typical case of referential integrity between two objects. Imagine this: we're Amazon, and being a large e-commerce platform, we want to enable other sellers to use our platform to sell their products, while we handle all the logistics (and of course get a percentage on every sale 😁). To achieve this, we come to an agreement with a seller after some negotiations, e.g. agreeing on the commission percentage we receive on every sale. During these negations, we can add some of the products of that seller to our platform, show them the pricing, additional information etc, so the seller can have an idea what his products would look like when promoted on our platform. Being Amazon, we of course have a micro-services lan...

In a recent post , Bernd Ruecker made a nice post on a pattern to transform events to commands in MicroServices and DDD. The post discusses the differences between Choreography and Orchestration as two major styles in which various micro-services can be connected and the pros and cons of these styles. Creating business process based systems using DDD is something I've been working on quite a bit. In this post, I would like to take this one step further and also show how the worlds of BPMN and DDD have a very nice fit, even b eyond than just this pattern. To do this, I'm going to make a connec tion between BP MN and a prominent style of analysis in the DDD world - Event Storming by Alberto Brandolini . Also, I'd like to dive into how the strategic design parts of DDD can help us in guiding us where we would like to apply these patterns. The latter will be subject of a later post. Event Storming First things first, lets look at Event Storming and how it is used in DD...