kogito-service-rest-call-quarkus

Kogito Service invocation with REST call

Description

A quickstart project that processes users in the system. It's main purpose is to to call external REST service to load a given user by its username.

This example shows

• invoking remote REST service

• control flow based on service calls

• Diagram

• Diagram Properties

• Diagram Properties

• Diagram Properties

• Find User Service Call

• Find User Service Call

• Find User Gateway Yes

• Find User Gateway No

• Audit User Service Rest Call

• Audit User Service Rest Call

In addition, it takes advantage of MicroProfile fault tolerance support to fallback if there are any errors during REST service invocation.

Build and run

Prerequisites

You will need:

• Java 11+ installed
• Environment variable JAVA_HOME set accordingly
• Maven 3.6.2+ installed

When using native image compilation, you will also need:

• GraalVM 19.1+ installed
• Environment variable GRAALVM_HOME set accordingly
• Note that GraalVM native image compilation typically requires other packages (glibc-devel, zlib-devel and gcc) to be installed too, please refer to GraalVM installation documentation for more details.

Compile and Run in Local Dev Mode

mvn clean package quarkus:dev    

NOTE: With dev mode of Quarkus you can take advantage of hot reload for business assets like processes, rules, decision tables and java code. No need to redeploy or restart your running application.

Compile and Run using Local Native Image

Note that this requires GRAALVM_HOME to point to a valid GraalVM installation

mvn clean package -Pnative

To run the generated native executable, generated in target/, execute

./target/kogito-service-rest-call-quarkus-{version}-runner

Use the application

Examine OpenAPI via swagger UI at http://localhost:8080/swagger-ui

Submit a user name

To make use of this application it is as simple as putting a sending request to http://localhost:8080/users with following content

{
"username" : "test"
}

Complete curl command can be found below:

curl -X POST -H 'Content-Type:application/json' -H 'Accept:application/json' -d '{"username" : "test"}' http://localhost:8080/users

After the above command you should see some log on Quarkus such as following

• Quarkus Log

To test the other route possible for unknown user send request to http://localhost:8080/users with following content

{
"username" : "nonexisting"
}

Complete curl command can be found below:

curl -X POST -H 'Content-Type:application/json' -H 'Accept:application/json' -d '{"username" : "nonexisting"}' http://localhost:8080/users

After the above command nothing will show on Quarkus log as the user is skipped but you should see the following on terminal after curl

• Curl Log