photo-gallery-monolith

This is a monolithic server application that is composed of the three components:

• Photo component
• Like component
• Query component

Note that each of the components can be deployed as a standalone microservice if so desired.

Build

You can build this project using:

mvn clean package

Or you can rebuild the entire monolithic application including its components using:

./build-all.sh

Database

This application requires access to a PostgreSQL database. You can create it using:

psql -c 'CREATE DATABASE monodb'
psql -c "CREATE USER monouser WITH ENCRYPTED PASSWORD 'password'"
psql -c 'GRANT ALL PRIVILEGES ON DATABASE monodb TO monouser'

Run

You can run this application using:

java -jar target/photo-gallery-monolith-1.0-SNAPSHOT-runner.jar

After the application starts up you can test it using curl.

To create some photos:

curl -v -X POST -H 'Content-Type: application/json' --data '{"name":"Odie","category":"animals"}' localhost:8083/photos
curl -v -X POST -H 'Content-Type: application/json' --data '{"name":"Garfield","category":"animals"}' localhost:8083/photos
curl -v -X POST -H 'Content-Type: application/json' --data '{"name":"Empire state building","category":"buildings"}' localhost:8083/photos

To retrieve all created photos:

curl -v localhost:8083/photos

To add some likes to the photo with ID 00cb8ab367bf4f8486e58cbf905792e0:

curl -v -X POST -H 'Content-Type: application/json' --data '{"id":"2","likes":"5"}' localhost:8083/likes
curl -v -X POST -H 'Content-Type: application/json' --data '{"id":"2","likes":"2"}' localhost:8083/likes

To retrieve likes received by all photos:

curl -v localhost:8083/likes

To retrieve all photos from a specific category ordered by the number of likes:

curl localhost:8083/query?category=animals

Deploying to OpenShift

Create a new project if it doesn't exist:

oc new-project photo-gallery-monolith

Deploy a PostgreSQL database:

oc new-app \
--template postgresql-persistent \
--param DATABASE_SERVICE_NAME=postgresql \
--param POSTGRESQL_USER=monouser \
--param POSTGRESQL_PASSWORD=password \
--param POSTGRESQL_DATABASE=monodb

Define a binary build (this will reuse the Java artifacts will built previously):

oc new-build \
--name monolith \
--binary \
--strategy docker

Correct the Dockerfile location in the build config:

oc patch bc monolith -p '{"spec":{"strategy":{"dockerStrategy":{"dockerfilePath":"src/main/docker/Dockerfile.jvm"}}}}'

Start the binary build:

oc start-build \
monolith \
--from-dir . \
--follow

Deploy the application:

oc new-app \
--image-stream monolith \
--name monolith \
--env QUARKUS_DATASOURCE_URL=jdbc:postgresql://postgresql:5432/monodb

Expose the application to the outside world:

oc expose svc monolith