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https://github.com/radcortez/quarkus-playground

Showcases typical use cases of Quarkus Applications
https://github.com/radcortez/quarkus-playground

java quarkus smallrye

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Showcases typical use cases of Quarkus Applications

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README 

        
# Quarkus Playground



The purpose of this Github repository is to showcase typical use cases of [Quarkus](https://quarkus.io) in applications

development.



## Pre Requisites



* [OpenJDK 17](https://adoptium.net/temurin/releases/?version=17)

* [GraalVM 22.3 - JDK 17](https://www.graalvm.org/release-notes/22_3/) (for native image)

* [Maven 3.9.6](https://maven.apache.org/download.cgi)

* [Docker](https://hub.docker.com/search/?type=edition&offering=community)



:information_source: **Use [SDKMAN!](https://sdkman.io) to manage Java and Maven versions**



## Project Structure



The project is a backend for a book store. It provides a REST API to Create, Read, Update and Delete books, and a REST

API to retrieve the ISBN of the book.



* number-api - A service to generate configurable Numbers.

* book-api - A service to manage books.

* standalone - A standalone client to call the Book API.

* simulator - A client simulator that generates random requests to the Book API and simulate traffic.



## SmallRye APIs



The following SmallRye APIs can be found through the project:



* Config (to generate the prefix of the Number API generation)

* OpenAPI (to document the REST API of both Number API and Book API)

* JWT (to authenticate and authorize calls that manage books)

* Fault Tolerance (to handle ISBN book generation if Number API cannot be called)

* Open Tracing (to trace calls between Book API and Number API)

* Reactive Messaging (to store Books that require ISBN book generation due to failure)

* Metrics (to record call statistics and count how many books require ISBN)

* Health (to monitor health of the Number API)

* REST Client (to call Book API with a standalone client)



## Libraries and Infra



The project uses [Quarkus](https://quarkus.io) as the Java stack, and the built in [SmallRye](https://smallrye.io)

components.



The required infrastructure provided by either Docker or Kubernetes includes:



* Postgres Database

* Kafka

* Jaeger

* Prometheus



## Build



Set up a local Docker Registry first to store the generated Docker images:



```bash

docker run -d -p 5000:5000 --restart=always --name docker-registry registry:2

```



Use Maven to build the project with the following command from the project root:



```bash

mvn verify -Dquarkus.container-image.build=true

```



## Run



### With Docker



The easiest way to run the entire system is to use `docker-compose`. This will run the apps, plus all the required

infrastructure. Run the following command from the project root:



```bash

docker-compose up

```



Use the following command to stop and remove all the containers:



```bash

docker-compose down

```



### With Java



The infrastructure is still required to run the applications properly. They can also be set up manually in the running

host, or use `docker-compose` to start only the required infrastructure:



```bash

docker-compose up database zookeeper kafka prometheus jaeger

```



To execute `number-api` and `book-api` directly, run the following command from each module root:



```bash

java -jar target/number-api-runner.jar



java -jar target/book-api-runner.jar

```



### With Kubernetes



The infrastructure to run in Kubernetes is available in the `.kubernetes` folder. 



Set the default Kubernetes namespace:



```bash

kubectl config set-context --current --namespace=default

```



To start the infrastructure run:



```bash

kubectl apply -f .kubernetes

```



Quarkus is able to generate the Kubernetes deployment files and deploy the application directly. This requires a Maven

build to generate the deployment descriptors:



 ```bash

mvn verify -Dquarkus.container-image.build=true -Dquarkus.kubernetes.deploy=true

```



## Test the Applications



Use Swagger-UI to access the applications REST endpoint and invoke the APIs:



* [Book API](http://localhost:8080/swagger-ui/#/)

* [Number API](http://localhost:8090/swagger-ui/#/)



For Authentication and Authorization in `book-api` you need to call `Authorize` in the Swagger interface to generate a

`JWT`. Any `client_id`, and `client_secret` is acceptable.



To check Metris and Tracing information:



* [Prometheus](http://localhost:9090)

* [Jaeger](http://localhost:16686)



## Native Images



Install GraalVM Native Image binary with:



```bash

gu install native-image

```



Set up an environment variable `GRAALVM_HOME` pointing to the GraalVM installation folder.



```bash

mvn package -Pnative

```



This is going to generate a binary executable for each module. To execute `number-api` and `book-api` as native, run

the following command from each module root:



```bash

./target/number-api-runner



./target/book-apo-runner

```



### Build Native Docker Images



To build Docker Images with the native binaries run the following command:



```bash

mvn verify -Pnative -Dquarkus.native.container-build=true -Dquarkus.container-image.build=true

```



Or to deploy it directly to Kubernetes:



```bash

mvn verify -Pnative -Dquarkus.native.container-build=true -Dquarkus.container-image.build=true -Dquarkus.kubernetes.deploy=true

```



## Resources



* [Quarkus](https://quarkus.io)

* [SmallRye](https://smallrye.io)

* [Developer Joy with Quarkus](https://docs.google.com/presentation/d/1W7NS7psVN5r35G-ItOaW9_4DWKDXFSRQ8ND928xtKHc/edit?usp=sharing)