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The microservice architecture pattern language consists of numerous groups of patterns. The value of a pattern language exceeds the sum of it’s individual patterns because it defines these relationships between the patterns:
Let’s look at how you can apply the microservice architecture pattern language to architect your application. In this post we will look at 3 critical decisions you must make. In later posts, we will look at other important, albeit not quite as critical patterns.
The first decision you must make is whether to use a Monolithic architecture pattern or the Microservice architecture pattern. If you pick the Microservice architecture pattern you must choose numerous other patterns to deal with the consequences of your decision.
As you can see, there are lots of other patterns that you must apply. Lets look at a couple of choices you must make.
If you have decided to use the microservice architecture you must define your services. There are two main options,
This patterns yield equivalent results: a set of services organized around business concepts rather than technical concepts.
A key feature of the microservice is the Database per Service pattern. It’s alternative, the Shared Database pattern is essentially an anti-pattern and best avoided. The Database per service pattern dramatically changes how you maintain data consistency and perform queries. You will need to use one of event-driven architecture patterns such as Transaction Log tailing or Event Sourcing to maintain data consistency. You will often need to implement queries using the Command Query Responsibility Segregation (CQRS) pattern.
To be continued….
Cross cutting concerns