![]() Read on for an explanation of these principles applied to microservices - the much-needed microservice "IDEALS." Interface Segregation The principles don’t cover the whole spectrum of design decisions for microservices-based solutions, but they touch the key concerns and success factors for creating modern service-based systems. Thus, we propose the following set of core principles for microservice design: Single responsibility is the idea that enables modeling microservices that are not too large or too slim because they contain the right amount of cohesive functionality.Īlthough some of the SOLID principles apply to microservices, object orientation is a design paradigm that deals with elements (classes, interfaces, hierarchies, etc.) that are fundamentally different from elements in distributed systems in general, and microservices in particular. ![]() Loose-coupling remains an important design concern in the case of microservices, with respect to afferent (incoming) and efferent (outgoing) coupling.Availability over consistency reminds us that more often end users value the availability of the system over strong data consistency, and they’re okay with eventual consistency. ![]() Event-driven suggests that whenever possible we should model our services to be activated by an asynchronous message or event instead of a synchronous call.Deployability (is on you) acknowledges that in the microservice era, which is also the DevOps era, there are critical design decisions and technology choices developers need to make regarding packaging, deploying and running microservices.Interface segregation tells us that different types of clients (e.g., mobile apps, web apps, CLI programs) should be able to interact with services through the contract that best suits their needs.For microservice design we propose developers follow the “IDEALS”: interface segregation, deployability (is on you), event-driven, availability over consistency, loose-coupling, and single responsibility. For object-oriented design we follow the SOLID principles.
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