![]() When designing a microservices-based application, programmers must adhere to this principle – there should not be multiple responsibilities in a microservice. It is also less likely to cause conflicts with other microservices. It also makes it easier to change classes without breaking them.Ī microservice that adheres to the Single Responsibility Principle is easier to maintain and update than a microservice that has multiple responsibilities. The benefits of this principle are obvious – it reduces complexity and improves flexibility, extensibility, and maintenance. The Single Responsibility Principle says there should be just one reason for a class to change at any time. Read: Top Collaboration Tools for Developers Microservices Principle #3: Single Responsibility Principle The gateway should then translate those requests into calls that make sense for its counterpart on the other side, i.e., the authentication and authorization service. For example: instead of having your profile management service call your authentication and authorization service, have it call an API gateway first. One way to avoid this dependency is by implementing a gateway that translates requests from one service into requests that another service will understand. ![]() For example, if you have two services: one for authentication and authorization and another for managing user profiles - do not build your system so that the profile management service needs to call the authentication and authorization service to work correctly. When designing a microservices architecture, you should avoid having cross-functional dependencies between services. ![]() In that case, you might have one microservice responsible for handling the user’s login, and another handling the purchase and billing process. In a discrete microservice architecture, each of the microservices are responsible for a specific task.Īs an example, assume that you have built a web application that enables users to buy shoes online. Microservices are small and independently deployable units of functionality, making them easier to manage and scale. Microservices Principle #2: Discrete Boundaries When components in an application are loosely coupled, you can test the application easily as well. The low level of coupling indicates that many modules are encapsulated from one another. A high level of coupling indicates that many modules know about each other there is not much encapsulation between modules. The higher the cohesion, the better – we may say that the modules are working together.Ĭoupling measures how much knowledge one module has of another, (i.e., how closely related different parts of a program are). Low cohesion suggests that the functions within a module are not closely related and cannot be understood as a set. Having a high level of cohesion implies that functions within a module are inextricably related and can be understood as a whole. The cohesion of a module refers to how closely related its functions are. These services should also not depend on each other, which means they should have low coupling. The idea behind this concept is that each service should do one thing and do it well, which means that the services should be highly cohesive. Microservices-based applications should have high cohesion and low coupling. ![]() Microservices Principle #1: High Cohesion and Low Coupling Here is the list of the key principles (these are just a few guidelines to follow) programmers should abide by to build microservices-based applications that are adaptable, scalable, and high performant. This programming tutorial presents a discussion on some microservices design principles that will serve as guidelines to build scalable, high performance, fault tolerant microservices-based applications. It is a way of building software that can be scaled independently and that can be developed, deployed, and updated more rapidly than traditional monolithic applications. Microservice architecture is a software architecture pattern where a system is designed as a network of loosely coupled services.
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