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Reactica

Setup

Install and setup required services

./deploy.sh

This script requires minishift and curl to be available in your $PATH as well as Internet access.

It:

  • Starts minishift with the right configuration if it is not yet started
  • Deploys the image streams and template
  • Adjusts permissions
  • Instantiates the Red Hat AMQ broker and Red Hat Data Grid
  • Waits for the data grid and AMQ broker to be in the ready state.

The script should be idempotent.

Configure the application

The file application.yaml in the setup directory defines parameters that control how often new users enter the queue, how long a ride lasts, and how many people can ride at the same time. The original file looks like this:

---
user-simulator:
  period-in-seconds: 5
  jitter-in-seconds: 2
  enabled: false

ride-simulator:
  duration-in-seconds: 30
  users-per-ride: 5
  jitter-in-seconds: 5
  enabled: true

The value user-simulator\period-in-seconds sets how many seconds go by before a new user gets in line. ride-simulator\duration-in-seconds is how long the ride takes, and ride-simulator\users-per-ride is how many people can ride at once.

From the setup directory, run ./create-application-config.sh to create a new Kubernetes ConfigMap with your values. If you want to change those values in the future, type oc edit configmap reactica-config. That puts you into the default editor for your system. Edit, save your changes, and everything is updated. It may take a few seconds before the changes take effect, but you should see the results in the behavior of the web UI.

Install the application

./deploy-application.sh

This script requires mvn and minishift to be available in your $PATH as well as Internet access.

It:

  • Builds the application and its services
  • Deploys the application
  • Waits for all of the components to be in both the Running and ready states.

Run the application

When the deploy-application.sh script is done, you should see something like this:

✔️  Pod event-generator is Running
✔️  Pod event-generator is ready
✔️  Pod event-store is Running
✔️  Pod event-store is ready
✔️  Pod current-line-updater is Running
✔️  Pod current-line-updater is ready
✔️  Pod queue-length-calculator is Running
✔️  Pod queue-length-calculator is ready
✔️  Pod billboard is Running
✔️  Pod billboard is ready

Now it's time to actually work with the coaster. You'll need the URL of the web UI; that means finding the Kubernetes route to the billboard pod. oc get routes does the trick:

$ oc get routes

NAME                      HOST/PORT                                                          PATH SERVICES         PORT                TERMINATION   WILDCARD
billboard                 billboard-reactive-demo.192.168.64.37.nip.io                       billboard             8080                None
console                   console-reactive-demo.192.168.64.37.nip.io                         eventstream-amq-jolokia <all>             None
current-line-updater      current-line-updater-reactive-demo.192.168.64.37.nip.io            current-line-updater  8080                None
event-generator           event-generator-reactive-demo.192.168.64.37.nip.io                 event-generator       8080                None
event-store               event-store-reactive-demo.192.168.64.37.nip.io                     event-store           8080                None
eventstore-dg             eventstore-dg-reactive-demo.192.168.64.37.nip.io                   eventstore-dg         <all>               None
queue-length-calculator   queue-length-calculator-reactive-demo.192.168.64.37.nip.io         queue-length-calculator   8080 None

(Apologies for the clumsiness of this listing.) If you look at the first line of the output, you'll see that the URL of the billboard component is billboard-reactive-demo.192.168.64.37.nip.io. Paste that into your browser and you should see the web UI:

Reactica web UI