Microservices - application proposal_
Microservices are a hot topic, which a couple of years ago has entered the IT salons. Although the issue is not new, giving a catchy name and a set of rules of application has encouraged the “big ones” to change their approach in creating complex systems, where particular emphasis is placed on their scalability.
Microservices, also called microservices architecture, is a programming style in which the entire application is made up of loosely connected, cooperating services, each responsible for a fragment of the business functions of the entire system. Unlike the ‘monolith’ architecture, a new developer joining a team focused on a single site can start implementation work faster-a smaller source code base, easier to test. Thanks to the fact that each service can be ‘released’ independently of the others, we can afford to release more versions with a higher frequency. In addition, we are not tied to one set of technologies-creating the next service we can adopt new technologies.
From a Java Developer’s perspectivea_
During creating a new project, the question that always arises is what set of technologies will allow us to achieve the planned goal. From the perspective of a Java developer, Spring framework seems to be the natural choice. The reason for this is undoubtedly a large number of libraries that extend the basic functionality with functions such as authentication and authorization, communication with databases, support for distributed systems. The configuration of all elements for each site can be intimidating, but there is a solution for this in the form of spring boot, which solves the need for preliminary and meaningful configuration for us. Spring Boot applications are built by default to the jar form, which, in addition to our application, also contains the Tomcat web application container. Running the entire application is therefore reduced to running the ‘java-jar’ command. By leveraging the capabilities of the spring cloud library suite, we can quickly build a targeted microservices architecture that includes standard paradigms like Gateway – which provides API access to each service, discovery service – which is a registry of running services.
And how to implement all this_?
Here we can use the technology that has gained great popularity on servers, in many cases replacing the classic virtualization. We are talking about the docker tool, which allows us to create containers that provide an environment for our applications. The main advantage of Docker as opposed to virtualization is that we can run our services in separate containers, without having to emulate the hardware layer and operating system. This translates into better use of available resources and lower maintenance costs. A virtual environment created with Docker will work exactly the same, regardless of where it was started. In addition, containers are isolated from the operating system and other containers, which fits perfectly with our microservices architecture, where each service is supposed to operate independently. Each service created using Spring Boot would be a separate container, so that the delivery of a new version of any service would not require redoploying other services.
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