![]() The goal of interface segregation for microservices is that each type of frontend sees the service contract that best suits its needs. Realizing interface segregation for microservices That is the main motivation to apply interface segregation to microservices. In the era of microservices, there is often a multitude of client programs (frontends) to the same service logic. However, the way we approach service contract design has changed since the old days of SOA. Starting in the early 2000s, SOA literature would prescribe canonical models or canonical schemas, with which all service clients should comply. The microservice architecture style is a specialization of the service-oriented architecture, wherein the design of interfaces (i.e., service contracts) has always been of utmost importance. In other words, instead of a class interface with all possible methods clients might need, there should be separate interfaces catering to the specific needs of each type of client. The original Interface Segregation Principle admonishes OO classes with "fat" interfaces. 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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