Distributed version of Spring Petclinic built with Spring Cloud
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arey and mszarlinski Add Hystrix Dashboard (#115)
* Add circuit breaker to the getVisitsForPets method

* Use Collections.emptyMap()

* Fallback method with private visibility

* Unit test Hystrix fallback method

* #17 Add a Hystrix Dashboard application

* Fix hystrix-dashboard container name
Latest commit ece0dc1 Nov 18, 2018

README.md

Distributed version of the Spring PetClinic Sample Application built with Spring Cloud

Build Status License

This microservices branch was initially derived from AngularJS version to demonstrate how to split sample Spring application into microservices. To achieve that goal we used Spring Cloud Netflix technology stack.

Starting services locally without Docker

Every microservice is a Spring Boot application and can be started locally using IDE or ../mvnw spring-boot:run command. Please note that supporting services (Config and Discovery Server) must be started before any other application (Customers, Vets, Visits and API). Tracing server and Admin server startup is optional. If everything goes well, you can access the following services at given location:

You can tell Config Server to use your local Git repository by using local Spring profile and setting GIT_REPO environment variable, for example: -Dspring.profiles.active=local -DGIT_REPO=/projects/spring-petclinic-microservices-config

Starting services locally with docker-compose

In order to start entire infrastructure using Docker, you have to build images by executing ./mvnw clean install -PbuildDocker from a project root. Once images are ready, you can start them with a single command docker-compose up. Containers startup order is coordinated with dockerize script. After starting services it takes a while for API Gateway to be in sync with service registry, so don't be scared of initial Zuul timeouts. You can track services availability using Eureka dashboard available by default at http://localhost:8761.

NOTE: Under MacOSX or Windows, make sure that the Docker VM has enough memory to run the microservices. The default settings are usually not enough and make the docker-compose up painfully slow.

Understanding the Spring Petclinic application

See the presentation of the Spring Petclinic Framework version

A blog bost introducing the Spring Petclinic Microsevices (french language)

You can then access petclinic here: http://localhost:8080/

Spring Petclinic Microservices screenshot

Architecture diagram of the Spring Petclinic Microservices

Spring Petclinic Microservices architecture

In case you find a bug/suggested improvement for Spring Petclinic Microservices

Our issue tracker is available here: https://github.com/spring-petclinic/spring-petclinic-microservices/issues

Database configuration

In its default configuration, Petclinic uses an in-memory database (HSQLDB) which gets populated at startup with data. A similar setup is provided for MySql in case a persistent database configuration is needed. Dependency for Connector/J, the MySQL JDBC driver is already included in the pom.xml files.

Start a MySql database

You may start a MySql database with docker:

docker run -e MYSQL_ROOT_PASSWORD=petclinic -e MYSQL_DATABASE=petclinic -p 3306:3306 mysql:5.7.8

or download and install the MySQL database (e.g., MySQL Community Server 5.7 GA), which can be found here: https://dev.mysql.com/downloads/

Use the Spring 'mysql' profile

To use a MySQL database, you have to start 3 microservices (visits-service, customers-service and vets-services) with the mysql Spring profile. Add the --spring.profiles.active=mysql as programm argument.

By default, at startup, database schema will be created and data will be populated. You may also manualy create the PetClinic database and data by executing the "db/mysql/{schema,data}.sql" scripts of each 3 microservices. In the application.yml of the Configuration repository, set the initialization-mode to never.

If you are running the microservices with Docker, you have to add the mysql profile into the (Dockerfile)[docker/Dockerfile]:

ENV SPRING_PROFILES_ACTIVE docker,mysql

In the mysql section of the application.yml from the Configuration repository, you have to change the host and port of your MySQL JDBC connection string.

Looking for something in particular?

Spring Cloud components Resources
Configuration server Config server properties and Configuration repository
Service Discovery Eureka server and Service discovery client
API Gateway Zuul reverse proxy and Routing configuration
Docker Compose Spring Boot with Docker guide and docker-compose file
Circuit Breaker Circuit Breaker with Hystrix guide and fallback method configuration
Graphite Monitoring TBD
Front-end module Files
Node and NPM The frontend-maven-plugin plugin downloads/installs Node and NPM locally then runs Bower and Gulp
Bower JavaScript libraries are defined by the manifest file bower.json
Gulp Tasks automated by Gulp: minify CSS and JS, generate CSS from LESS, copy other static resources
Angular JS app.js, controllers and templates

Contributing

The issue tracker is the preferred channel for bug reports, features requests and submitting pull requests.

For pull requests, editor preferences are available in the editor config for easy use in common text editors. Read more and download plugins at http://editorconfig.org.