At present, there is no lack of frameworks for creating miсroservices in Java and Kotlin. In this article, we will be considering the following frameworks… but for a deeper refresher on building a microservice API with Spring Boot click here .
Based on the above, four services were created that can interact with each other through the HTTP API using the Service Discovery pattern implemented by Consul. Thus, they form a heterogeneous (at the level of frameworks) microservice architecture (hereafter referred to as MSA):
In this article, the implementation of microservices on each of the frameworks is briefly considered (for more details, check monorepo’s source code on GitHub and the parameters of the obtained applications are compared.
Let’s define a set of requirements for each service:
#java #microservices #spring boot #kotlin #quarkus #micronaut #helidon #ktor
The spring framework is one of the most versatile frameworks in java which is used to bring down the complexity of the development of enterprise-grade applications. The first production release of the spring framework was in March 2004 and since then, this robust and open-source framework has gained tremendous popularity, so much so that it is often referred to by developers all around the world as the “framework of frameworks”. Spring is a loosely coupled, open-source application framework of java. It is lightweight and the inversion of the control container for the Java platform. A large number of Java applications use the core features of the spring framework. In addition to that, extensions have also been developed to allow developers to develop Web Applications on top of the Java Enterprise Edition platform.
#spring #spring-framework #java #spring framework tutorial #why should one learn about the spring framework? #what is the spring framework in java?
#spring #spring-framework #spring-boot #microservices #cloud #springcloud
The article demonstrates how to write a contract between the producer & the consumer and how to implements the producer & the consumer side test cases for Spring Cloud Contract through an HTTP request between two microservices.
The producer is a service that exposes an API (e.g. rest endpoint) or sends a message (e.g. Kafka Producer which publishes the message to Kafka Topic)
The consumer is a service that consumes the API that is exposed by the producer or listens to a message from the producer (e.g. Kafka Consumer which consumes the message from Kafka Topic)
The contract is an agreement between the producer and consumer how the API/message will look like.
Consumer-driven contract (CDD) is an approach where the consumer drives the changes in the API of the producer.
Consumer-driven contract testing is an approach to formalize above mentioned expectations into a contract between each consumer-provider pair. Once the contract is established between Provider and Consumer, this ensures that the contract will not break suddenly.
Spring Cloud Contract is a project of spring-cloud that helps end-users in successfully implementing the Consumer Driven Contracts (CDC) approach. The Spring Cloud Contract Verifier is used as a tool that enables the development of Consumer Driven Contracts. Spring Cloud Contract Verifier is used with Contract Definition Language (DSL) written in Groovy or YAML.
To understand the concept of the Spring Cloud Contract, I have implemented two simple microservices. The code for these applications can be found on Github account.
Request and response between the consumer and the producer
It is the first microservice responsible for creating an employee’s profile based on the given details. We are only passing the FirstName, LastName, and Identification Number (e.g. National ID) of the employee. This microservice is calling another microservice to first check, based on the Identity Number, whether the profile has already been created for the employee.
This is the second microservice service that is just checking if an employee profile already exists. If the employee profile is matching with the Identification Number provided in the database, it will return the profile else return an empty profile with the EMPLOYEE_NOT_FOUND status.
The create-employee-application microservice is having a dependency on get-employee-application microservice, so we have written a contract of get-employee-application. We are not using any database here to store or retrieve employee details so that written simple logic which will help us to fetch the existing employee profile.
We are going to understand how we have done the setup for these applications. We are going to discuss the setup in each microservice one by one.
#tutorial #microservices #spring boot #spring cloud #spring boot microservices #spring cloud contract #microservices testing
#spring boot #spring boot tutorial #interceptor #interceptors #spring boot interceptor #spring boot tutorial for beginners
As an extension of the Spring Framework, Spring Boot is widely used to make development on Spring faster, more efficient and convenient. In this article, we will look at some of the parameters were using Spring Boot can drastically reduce the time and effort required in application development.
#full stack development #spring #spring and spring boot #spring boot