REST API Level 0 - Fuse Booster

The REST API Level 0 mission shows how to map business operations to a remote procedure call endpoint over HTTP by using a REST framework. This mission corresponds to Level 0 in the Richardson Maturity Model.

By using this Fuse booster, you can quickly prototype and flexibly design a REST API.

This booster introduces the mechanics of interacting with a remote (exposed by Apache Camel) service using the HTTP protocol.

Use this booster to:

• Execute an HTTP GET request on the camel/greetings/{name} endpoint by using the URL parameter {name}. The JSON-formatted response has a payload of Hello, $name! (where $name is replaced by the value of the URL parameter from the HTTP GET request).

• Browse the API’s Swagger page.

Deployment options

You can run this booster in the following modes:

• Single-node OpenShift cluster

• OpenShift Online at https://developers.redhat.com/launch

• Standalone on your machine

The most effective way to use this booster is to deploy and run the project on OpenShift.

For more details about running this booster on a single-node OpenShift cluster, CI/CD deployments, as well as the rest of the runtime, see the Spring Boot Runtime Guide.

Important

This booster requires Java 8 JDK or later and Maven 3.3.x or later.

Running the booster on a single-node OpenShift cluster

A single-node OpenShift cluster provides you with access to a cloud environment that is similar to a production environment.

If you have a single-node OpenShift cluster, such as Minishift or the Red Hat Container Development Kit, installed and running, you can deploy your booster there.

To deploy this booster to a running single-node OpenShift cluster:

1. Download the project and extract the archive on your local filesystem.

2. Log in to your OpenShift cluster:

   $ oc login -u developer -p developer

3. Create a new OpenShift project for the booster:

   $ oc new-project MY_PROJECT_NAME

4. Change the directory to the folder that contains the extracted booster application (for example, my_openshift/fuse-rest-http-booster) :

   $ cd my_openshift/fuse-rest-http-booster

5. Build and deploy the project to the OpenShift cluster:

   $ mvn clean -DskipTests oc:deploy -Popenshift

6. In your browser, navigate to the MY_PROJECT_NAME project in the OpenShift console. Wait until you can see that the pod for the fuse-rest-http-booster application has started up.

7. On the project’s Overview page, locate the URL for the fuse-rest-http-booster application. The URL uses this form: http://fuse-rest-http-booster-MY_PROJECT_NAME.OPENSHIFT_IP_ADDR.nip.io.

8. Click the URL to access the Greeting Service and then follow the instructions on that page.

Running the booster on a single-node OpenShift cluster without preinstalled images

To deploy your booster to a running single-node OpenShift cluster without preinstalled images:

1. Download the project and extract the archive on your local filesystem.

2. Log in to your OpenShift cluster:

   $ oc login -u developer -p developer

3. Create a new OpenShift project for the booster:

   $ oc new-project MY_PROJECT_NAME

4. Import base images in your newly created project (MY_PROJECT_NAME):

   $ oc import-image fuse-java-openshift-rhel8:1.9 --from=registry.access.redhat.com/fuse7/fuse-java-openshift-rhel8:1.9 --confirm

5. Build and deploy the project to the OpenShift cluster:

   $ mvn clean -DskipTests oc:deploy -Popenshift -Djkube.generator.fromMode=istag -Djkube.generator.from=MY_PROJECT_NAME/fuse-java-openshift-rhel8:1.9

6. In your browser, navigate to the MY_PROJECT_NAME project in the OpenShift console. Wait until you can see that the pod for the fuse-rest-http-booster application has started up.

7. On the project’s Overview page, locate the URL for the fuse-rest-http-booster application. The URL uses this form: http://fuse-rest-http-booster-MY_PROJECT_NAME.OPENSHIFT_IP_ADDR.nip.io.

8. Click the URL to access the greetings service application and then follow the instructions on that page.

Running the booster on OpenShift Online

To deploy this booster directly to OpenShift Online when you create the project at https://developers.redhat.com/launch.

1. Go to https://developers.redhat.com/launch.

2. At the Deployment step, select Use OpenShift Online.

3. Follow the on-screen instructions to create a new REST API Level 0 project by using the Fuse runtime.

Note	As part of the process of creating this booster, https://developers.redhat.com/launch sets up a project with a CI/CD deployment of this booster. You can see the status of this deployment in your single-node OpenShift cluster or OpenShift Online web console.

Running the booster standalone on your machine

To run this booster as a standalone project on your local machine:

1. Download the project and extract the archive on your local filesystem.

2. Build the project:

   $ cd PROJECT_DIR
   $ mvn clean package

3. Run the services:

   $ mvn spring-boot:run

4. Go to http://localhost:8080 and then follow the instructions on that page.