Lagom is a Swedish word meaning just right, sufficient. Microservices are about creating services that are just the right size, that is, they have just the right level of functionality and isolation to be able to adequately implement a scalable and resilient system.
Lagom focuses on ensuring that your application realises the full potential of the Reactive Manifesto, while delivering a high productivity development environment, and seamless production deployment experience.
This is a sample Java auction system using the Lagom Framework. A Scala version of the auction system is also available.
To get started make sure you have sbt and git installed on your system. You will also need an active internet connection.
You will need to install sbt:
- To install sbt on Mac you can have a look at The SBT Documentation for Mac
- To install sbt on Windows you can have a look at The SBT Documentation for Windows
- To install sbt on Linux you can have a look at The SBT Documentation for Linux
You will need to download and run an Elastisearch server: (optional)
curl -L -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.0.2.tar.gz
tar -xvf elasticsearch-5.0.2.tar.gz
cd elasticsearch-5.0.2/bin
./elasticsearch
On another terminal, clone this repo and run the sample app using the command sbt runAll:
git clone git@github.com:lagom/online-auction-java.git
cd online-auction-java
sbt runAll
- To import the online-auction-javaproject into IntellijIDEA you can have a look at The Lagom Documentation for IDEA
- To import the online-auction-javaproject into Eclipse you can have a look at The Lagom Documentation for Eclipse
- You will also need to add Lombok plugin in your IDE for annotations. Take a look at The Lagom Documentation for Lombok
The auction system is the sum of 5 micro-services and a web gateway:
- Item Service: Manages the description and auction status (created, auction, completed, cancelled) of an item.
- Bidding service: Manages bids on items.
- Search service: Handles all item searching.
- Transaction service: Handles the transaction of negotiating delivery info and making payment of an item that has completed an auction.
- user-service: a convenience service to stub user management. Don't use any code in
user-serviceas reference on how to create a secure user management micro-service. - web-gateway: a Play application providing web UI and acting as gateway to all previously described services.
Check the docs for each service for details on the commands and queries it serves as well as events the service emits and events it consumes from the Message Broker.
- Hello World seed For a simple, gentler, introduction to Lagom with Java, have a look at the Hello World Lagom archetype using Maven or Giter8 lagom template with sbt.
- Getting help If you have any troubles and need help, feel free to ask in the Gitter channel