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The goal of this project is to play with Spring WebFlux on client and server side. For it, we will implement some Spring Boot Java Web applications, product-api, customer-api, order-api and client-shell, and use reactive NoSQL database like Cassandra, MongoDB, Postgres and MySQL.

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spring-webflux-reactive-databases

The goal of this project is to play with Spring WebFlux both on client and server side. For it, we will implement Spring Boot Java Web applications (product-api, customer-api, order-api, notification-api and client-shell) and use different databases like Cassandra, MongoDB, Postgres and MySQL.

Proof-of-Concepts & Articles

On ivangfr.github.io, I have compiled my Proof-of-Concepts (PoCs) and articles. You can easily search for the technology you are interested in by using the filter. Who knows, perhaps I have already implemented a PoC or written an article about what you are looking for.

Additional Readings

Project Architecture

project-diagram

Applications

  • product-api

    Spring Boot Java Web application that exposes a REST API to manage products. It uses MongoDB as storage.

    product-api-swagger

  • customer-api

    Spring Boot Java Web application that exposes a REST API to manage customers. It uses Postgres as storage.

    customer-api-swagger

  • order-api

    Spring Boot Web Java application that exposes a REST API to manage orders. It uses Cassandra as storage. In order to get more information about an order, i.e, the name of the customer who placed it or the name or price of the products in the order, order-api uses WebClient and CompletableFuture to fetch this information from customer-api and product-api.

    order-api-swagger

  • notification-api

    Spring Boot Web Java application that exposes a REST API to manage notifications.

    notification-api-swagger

  • client-shell

    Spring Boot Shell Java application that has a couple of commands to interact with product-api, customer-api, order-api and notification-api. The picture below show those commands.

    client-shell

Prerequisites

Initialize Environment

  • Open a terminal and inside spring-webflux-reactive-databases root folder run

    ./init-environment.sh

  • Wait for the script to finish

Run applications with Maven

  • product-api

    Open a new terminal and, inside spring-webflux-reactive-databases root folder, run the following command

    ./mvnw clean spring-boot:run --projects product-api

  • customer-api

    Open a new terminal and, inside spring-webflux-reactive-databases root folder, run the following command

    ./mvnw clean spring-boot:run --projects customer-api

  • order-api

    Open a new terminal and, inside spring-webflux-reactive-databases root folder, run the following command

    ./mvnw clean spring-boot:run --projects order-api

  • notification-api

    Open a new terminal and, inside spring-webflux-reactive-databases root folder, run the following command

    ./mvnw clean spring-boot:run --projects notification-api

  • client-shell

    Open a new terminal and, inside spring-webflux-reactive-databases root folder, run the following command to build the executable jar file

    ./mvnw clean package --projects client-shell -DskipTests

    To start client-shell run

    ./client-shell/target/client-shell-1.0.0.jar

Run applications as Docker containers

  • Build Docker Images

    • In a terminal, make sure you are in spring-webflux-reactive-databases root folder
    • Run the following script to build the Docker images 
      ./docker-build.sh

  • Environment Variables

    • product-api

      Environment Variable Description
      MONGODB_HOST Specify host of the Mongo database to use (default localhost)
      MONGODB_PORT Specify port of the Mongo database to use (default 27017)

    • customer-api

      Environment Variable Description
      POSTGRES_HOST Specify host of the Postgres database to use (default localhost)
      POSTGRES_PORT Specify port of the Postgres database to use (default 5432)

    • order-api

      Environment Variable Description
      CASSANDRA_HOST Specify host of the Cassandra database to use (default localhost)
      CASSANDRA_PORT Specify port of the Cassandra database to use (default 9042)
      PRODUCT_API_HOST Specify host of the product-api to use (default localhost)
      PRODUCT_API_PORT Specify port of the product-api to use (default 9080)
      CUSTOMER_API_HOST Specify host of the customer-api to use (default localhost)
      CUSTOMER_API_PORT Specify port of the customer-api to use (default 9081)

    • notification-api

      Environment Variable Description
      MYSQL_HOST Specify host of the MySQL database to use (default localhost)
      MYSQL_PORT Specify port of the MySQL database to use (default 3306)
      CUSTOMER_API_HOST Specify host of the customer-api to use (default localhost)
      CUSTOMER_API_PORT Specify port of the customer-api to use (default 9081)
      ORDER_API_HOST Specify host of the order-api to use (default localhost)
      ORDER_API_PORT Specify port of the order-api to use (default 9082)

    • client-shell

      Environment Variable Description
      PRODUCT_API_HOST Specify host of the product-api to use (default localhost)
      PRODUCT_API_PORT Specify port of the product-api to use (default 9080)
      CUSTOMER_API_HOST Specify host of the customer-api to use (default localhost)
      CUSTOMER_API_PORT Specify port of the customer-api to use (default 9081)
      ORDER_API_HOST Specify host of the order-api to use (default localhost)
      ORDER_API_PORT Specify port of the order-api to use (default 9082)
      NOTIFICATION_API_HOST Specify host of the notification-api to use (default localhost)
      NOTIFICATION_API_PORT Specify port of the notification-api to use (default 9083)

  • Start Docker Containers

    • In a terminal, make sure you are inside spring-webflux-reactive-databases root folder
    • Run following command 
      ./start-apis.sh && ./start-shell.sh

Application's URL

Application URL
product-api http://localhost:9080/swagger-ui.html
customer-api http://localhost:9081/swagger-ui.html
order-api http://localhost:9082/swagger-ui.html
notification-api http://localhost:9083/swagger-ui.html

Playing around

Warning: the ids shown below will be different when you run it

  • In client-shell terminal, import some products and customers by running the following command

    • If you are running using Maven 
      script ../src/main/resources/samples.txt
    • If you are running as Docker container 
      script /workspace/BOOT-INF/classes/samples.txt

  • Get all customer

    get-customers

    It should return

    {"id":"1","name":"Customer A","email":"[email protected]","city":"Berlin","street":"NYC Strasse","number":"123"}
{"id":"2","name":"Customer B","email":"[email protected]","city":"Berlin","street":"LA Strasse","number":"234"}
{"id":"3","name":"Customer C","email":"[email protected]","city":"Berlin","street":"DC Strasse","number":"345"}
...

  • Get all products

    get-products

    It should return

    {"id":"5ee3ee31b460d868af49f389","name":"product-1","price":199.99}
{"id":"5ee3ee32b460d868af49f38a","name":"product-2","price":299.99}
...

  • Create an order where Customer A buys 1 unit of product-1 and 2 units of product-2

    Warning: the product ids informed here are just a sample. You will have different ones.

    create-order --customerId 1 --products 5ee3ee31b460d868af49f389:1;5ee3ee32b460d868af49f38a:2

    It should return

    {
  "orderId":"5aaad64c-4e80-48e0-926d-8f1b7027955a",
  "status":"OPEN",
  "created":"2020-06-12T22:09:59.558232",
  "products": [
    {"id":"5ee3ee31b460d868af49f389", "quantity":1},
    {"id":"5ee3ee32b460d868af49f38a", "quantity":2}
  ],
  "customerId":"1"
}

  • Get details about the order created

    get-order-detailed 5aaad64c-4e80-48e0-926d-8f1b7027955a

    It should return

    {
  "orderId":"5aaad64c-4e80-48e0-926d-8f1b7027955a",
  "status":"OPEN",
  "created":"2020-06-12T22:09:59.558",
  "products": [
    {"id":"5ee3ee32b460d868af49f38a", "name":"product-2", "quantity":2, "price":299.99},
    {"id":"5ee3ee31b460d868af49f389", "name":"product-1", "quantity":1, "price":199.99}
  ],
  "customer": {
    "id":"1",
    "name":"Customer A",
    "email":"[email protected]",
    "city":"Berlin",
    "street":"NYC Strasse",
    "number":"123"
  }
}

  • To create a notification to the order created above

    create-notification 5aaad64c-4e80-48e0-926d-8f1b7027955a

  • To check how fast order-api get details about the customer and products of an order, create another order where Customer A order 50 random products

    create-order-random --customerId 1 --numProducts 50

    It should return

    {
  "orderId":"87133d36-67f0-4388-b15b-7d66ad739374",
  "status":"OPEN",
  "created":"2020-06-12T22:14:08.342338",
  "products": [
    {"id":"5ee3ee32b460d868af49f38a", "quantity":4},
    ...
    {"id":"5ee3ee32b460d868af49f396", "quantity":3}
  ],
  "customerId":"1"
}

  • In another terminal, to get the details of the order previously created and the response time of this call, we are using order-api's endpoint GET /api/orders/{orderId}/detailed

    curl -w "\n\nResponse Time: %{time_total}s" -s localhost:9082/api/orders/87133d36-67f0-4388-b15b-7d66ad739374/detailed

    It will return something like

    {
  "orderId":"87133d36-67f0-4388-b15b-7d66ad739374",
  "status":"OPEN",
  "created":"2020-06-12T22:14:08.342338",
  "products": [
    {"id":"5ee3ee32b460d868af49f395", "name":"product-13", "quantity":4, "price":1399.99},
    ...
  ],
  "customer": {
    "id":"1",
    "name":"Customer A",
    "email":"[email protected]",
    "city":"Berlin",
    "street":"NYC Strasse",
    "number":"123"
  }
}

Response Time: 0.292698s

Useful Commands

  • Cassandra

    docker exec -it cassandra cqlsh
USE mycompany;
SELECT * FROM orders;

    Type exit to get out of cqlsh

  • MongoDB

    docker exec -it mongodb mongosh productdb
db.products.find()

    Type exit to get out of MongoDB shell

  • Postgres

    docker exec -it postgres psql -U postgres -d customerdb
\dt customer
SELECT * FROM CUSTOMER;

    Type exit to get out of psql

  • MySQL

    docker exec -it -e MYSQL_PWD=secret mysql mysql -uroot --database notificationdb
SELECT * FROM notification;

    Type exit to get out of MySQL monitor

Shutdown

  • To stop client-shell, go to the terminal where it is running and type exit
  • To stop product-api, customer-api and order-api
    • If you start them with Maven, go to the terminals were they are running and press Ctrl+C
    • If you start them as Docker containers, go to a terminal and, inside spring-webflux-reactive-databases root folder, run the following script 
      ./stop-apis.sh
  • To stop and remove the database containers, network and volumes, go to a terminal and, inside spring-webflux-reactive-databases root folder, run the script below 
    ./shutdown-environment.sh

Cleanup

To remove all Docker images created by this project, go to a terminal and, inside spring-webflux-reactive-databases root folder, run the following script

./remove-docker-images.sh

References

About

The goal of this project is to play with Spring WebFlux on client and server side. For it, we will implement some Spring Boot Java Web applications, product-api, customer-api, order-api and client-shell, and use reactive NoSQL database like Cassandra, MongoDB, Postgres and MySQL.

Topics

mysql java docker cassandra spring-boot mongodb postgresql mapstruct spring-aop spring-shell spring-webflux spring-data-mongodb-reactive http-interface spring-data-cassandra-reactive spring-data-r2dbc springdoc-openapi

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