Springy Store μServices

• This project is a development of a small set of Spring Boot based Microservices projects, that implement cloud-native intuitive, design patterns and coding best practices.
• The project follows CloudNative recommendations and The twelve-factor app methodology for building software-as-a-service apps to show how μServices should be built and deployed.
• The project is using cutting edge technologies like Docker, Kubernetes, Elasticsearch Stack for logging and monitoring, Java SE 14, MySQL database, MongoDB, TDD, unit, integration & performance testing and Reactive Programming, and many more.

---

I am developing this project as stages, and all such stages are documented under project Springy Store μServices [wiki page](https://github.com/mohamed-taman/Springy-Store -Microservices/wiki). Each of such stage will be a release in its owen, so you can go back and forward between releases to see the differences and how adding things solve specific problems we face.

For example; in the first stage (1st release) I just created project structure, basic services' skeleton, integration between them, and finally write integration testing as well as semi-automated testing for the whole services' functionality.

At 1st stage the recommendation and review microservices generate local in-memory data and product composite service calls the other three services (product, recommendation, and review) statically to generate client aggregate response for a specific product. Therefore, in:

• The second stage I will introduce database integration, then in
• The third stage I will introduce Dockerization of our services and docker-compose, and in
• The fourth stage I will introduce service discovery, and so on.

Getting started

The first stage aka (Release v1.0) is about creating and implementing a set of project Microservices.

Creating a Set of Cooperating Microservices

The following topics are going to be covered in this 1st stage (other stages topics to be documented in a project wiki):

• Introducing the microservice landscape.
• Generating skeleton microservices.
• Adding RESTful APIs.
• Adding a product composite, product, recommendation, and review microservices.
• Adding error handling.
• Testing the APIs manually.
• Adding automated tests of microservices in isolation.
• Adding semi-automated tests to a microservice landscape.

System Boundary - μServices Landscape

Required software

The following software pieces are initially required:

1. Git: it can be downloaded and installed from https://git-scm.com/downloads.

2. Java 14: it can be downloaded and installed from https://www.oracle.com/technetwork/java/javase/downloads/index.html.

3. curl: this command-line tool for testing HTTP-based APIs can be downloaded and installed from https://curl.haxx.se/download.html.

4. jq: This command-line JSON processor can be downloaded and installed from https://stedolan.github.io/jq/download/.

5. Spring Boot Initializer: This Initializer generates spring boot project with just what you need to start quickly! start from here https://start.spring.io/.

   For each future stage, I will list the newly required software.

Follow the installation guide for each software website and check your software versions from the command line to verify that they are installed correctly.

Using an IDE

I recommend that you work with your Java code using an IDE that supports the development of Spring Boot applications such as Spring Tool Suite or IntelliJ IDEA Ultimate Edition. So you can use the Spring Boot Dashboard to run the services, run each microservice test case and many more.

All that you want to do is just fire up your IDE -> open or import the parent folder springy-store-microservices and everything will be ready for you.

Playing With Spring Store Project

Cloning It

First open git bash command line, then simply you can clone the project under any of your favorite places as the following:

> git clone https://github.com/mohamed-taman/Springy-Store-Microservices.git

Build & Test Them In Isolation

To build and run test cases for each service & shared modules in the project we need to do the following:

First: Build & Install Shared Dependencies

This done only for the first time or any new version of shared modules.

To build and install store-utils, store-api, store-chassis libraries, from the root folder springy-store-microservices run the following commands:

mohamed.taman@DTLNV8 ~/springy-store-microservices 
λ ./setup.sh

And you should expect output like this:

Installing all Springy store core shared modules
................................................

1- Installing shared [Utilities] module...
Done successfully.

2- Installing shared [APIs] module...
Done successfully.

3- Installing [parent project] module...
Done successfully.

Wooohooo, building & installing all project modules are finished successfully.
and the project is ready for the next step. :)

Second: Build & Test Microservices

Now it is time to build our 4 microservices and run each service integration test in isolation by running the following commands:

mohamed.taman@DTLNV8 ~/springy-store-microservices 
λ ./mvnw clean verify -f store-chassis/

All build commands and test suite for each microservice should run successfully, and the final output should be like this:

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Springy Store APIs 1.0-SNAPSHOT .................... SUCCESS [  3.048 s]
[INFO] Springy Store Utils 1.0-SNAPSHOT ................... SUCCESS [  2.107 s]
[INFO] Springy Store Chassis 0.0.1-SNAPSHOT ............... SUCCESS [  0.865 s]
[INFO] Product Composite Service 0.0.1-SNAPSHOT ........... SUCCESS [ 11.086 s]
[INFO] Product Service 0.0.1-SNAPSHOT ..................... SUCCESS [  9.795 s]
[INFO] Review Service 0.0.1-SNAPSHOT ...................... SUCCESS [  9.214 s]
[INFO] Recommendation Service 0.0.1-SNAPSHOT .............. SUCCESS [  9.288 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  46.006 s
[INFO] Finished at: 2020-04-01T17:07:52+02:00
[INFO] ------------------------------------------------------------------------

Running Them All

Now it's the time to run all of them, and it's very simple just run the following two commands:

mohamed.taman@DTLNV8 ~/springy-store-microservices 
λ ./run-em-all.sh

All the services will run in parallel, and their output will be printed to the console.

Testing Them All

Now it's time to test all functionality of the application as one part. And to do so just run the following automation test script:

mohamed.taman@DTLNV8 ~/springy-store-microservices 
λ ./test-em-all.sh

The result should be something like this:

Starting [Springy Store] full functionality testing....

HOST=localhost
PORT=9080
Test OK (HTTP Code: 200)
Test OK (actual value: 1)
Test OK (actual value: 3)
Test OK (actual value: 3)
Test OK (HTTP Code: 404, {"httpStatus":"NOT_FOUND","message":"No product found for productId: 13","path":"/product-composite/13","time":"2020-04-01@14:51:48.812+0200"})
Test OK (HTTP Code: 200)
Test OK (actual value: 113)
Test OK (actual value: 0)
Test OK (actual value: 3)
Test OK (HTTP Code: 200)
Test OK (actual value: 213)
Test OK (actual value: 3)
Test OK (actual value: 0)
Test OK (HTTP Code: 422, {"httpStatus":"UNPROCESSABLE_ENTITY","message":"Invalid productId: -1","path":"/product-composite/-1","time":"2020-04-01@14:51:49.763+0200"})
Test OK (actual value: "Invalid productId: -1")
Test OK (HTTP Code: 400, {"timestamp":"2020-04-01T12:51:49.965+0000","path":"/product-composite/invalidProductId","status":400,"error":"Bad Request","message":"Type mismatch."})
Test OK (actual value: "Type mismatch.")

Closing The Story

Finally, to close the story, we will need to shut down Microservices manually service by service , hahaha just kidding, run the following script to shut down them all:

mohamed.taman@DTLNV8 ~/springy-store-microservices 
λ ./stop-em-all.sh

And the output should be as the following:

Stopping [Springy Store] μServices ....
---------------------------------------

Stopping Microservice at port 9080 ....
{"message":"Shutting down, bye..."}
Microservice at port 9080 stopped successfully ....

Stopping Microservice at port 9081 ....
{"message":"Shutting down, bye..."}
Microservice at port 9081 stopped successfully ....

Stopping Microservice at port 9082 ....
{"message":"Shutting down, bye..."}
Microservice at port 9082 stopped successfully ....

Stopping Microservice at port 9083 ....
{"message":"Shutting down, bye..."}
Microservice at port 9083 stopped successfully ....

The End

Happy coding :)

License

Copyright (C) 2017-2020 Mohamed Taman

Licensed under the MIT License.