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Version: 2.0

Develop a new microservice

REGARDS Microservices are REST services exposed by a Jetty web server contained in a Spring boot application and composed of modules. Each microservice is a Maven project aggregating Maven modules.
There is two modules by default:

  • one responsible for running the microservice
  • one responsible for business.

In case a microservice needs to be composed by more than one business module, a module archetype is available.

Requirements for development​

  • Git client
  • Maven v3.8.4+
  • JDK Eclipse Temurin v17.0.3+

Common features​

Each microservice offers the features :

  • REST Resources authorization access by user ROLES
  • Access to the Cloud Eureka Registry client to communicate with others microservices
  • Access to the Cloud Config Server to centralize configurations properties
  • Swagger Interface : http://address:port/swagger-ui.html

Create your first microservice​

To create a new microservice you have to create a new maven project with the microservice-archetype. To do so :

  • Clone the git regards-backend repository
git clone https://github.com/RegardsOss/regards-backend.git
  • Compile and install the maven project
cd regards-backend
mvn clean install -DskipTests
  • Generate the new microservice in another folder than regards-backend thanks to the maven project archetype:
mkdir ../myMicroservice
cd ../myMicroservice
mvn archetype:generate -DarchetypeCatalog=local

You have many archetype proposed to you, under the format

number: [local|remote] -> archetype_group_id:archetype_artifact_id (archetype_description)

find the line

X: local -> fr.cnes.regards.microservices:microservice-archetype (microservice-archetype)

and enter X

where X is the actual number of the microservice creation archetype. Then enter the requested fields as follow :

  • groupId : fr.cnes.regards.microservices.mymicroservice
  • artifactId : mymicroservice
  • version : press enter to apply default value
  • package : press enter to apply default value
  • microserviceDescription : My microservice description
  • microserviceName : mymicroservice
  • microserviceTitle : My Microservice

Create your first module​

Once you have created the microservice module, you have to create sub-modules.

To add a new module to your microservice you have to add a new maven module with the module-archetype. To do so :

  • Inside the microservice root folder, execute the following command to generate a module
  cd myMicroservice
  mvn archetype:generate -DarchetypeCatalog=local

Choose the right archetype (fr.cnes.regards.modules:module-archetype) and enter requested field as follow :

  • groupId : fr.cnes.regards.modules
  • artifactId : my-module
  • version : press enter to apply default value
  • package : press enter to apply default value

Add the following dependency to bootstrap-myMicroservice/pom.xml file (for instance, with the module artifact id myModule) :


<dependency>
    <groupId>fr.cnes.regards.modules</groupId>
    <artifactId>my-module-rest</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

References​

You can also find a tutorial documentation on how to build REGARDS plugins and microservices here