las2peer is a Java-based server framework for developing and deploying microservices in a distributed Peer-to-Peer (P2P) environment. It is developed by the Advanced Community Information Systems (ACIS) group at the Chair of Computer Science 5 (Information Systems & Databases), RWTH Aachen University, Germany. It's main focus lies on providing developers with a tool to easily develop and test their microservices and deploy them in a P2P network without having to rely on a centralized infrastructure. Communication between nodes is realized using the FreePastry library.

For more information on the core concepts of las2peer, please visit las2peer.org or read the las2peer Primer.

Service Development

This project contains las2peer itself. To develop a service for las2peer, please use the las2peer Template Project and follow the instructions of the project's ReadMe.

If you want to learn more about las2peer, please visit the las2peer Template Project's Wiki Page.

Preparations

Java

las2peer uses Java 17.

Build Dependencies

• Gradle 7.2
• Node 14 / npm

Project Structure

Modules

This repository contains three las2peer modules:

• Core (/core)
• REST Mapper (/restmapper)
• Web Connector (/webconnector)

Each of them resides in its own subfolder, containing a build file providing the following tasks:

• gradle jar will build the respective jar of the submodule. The jars will be stored in /export/jars.
• gradle test will run the respective JUnit tests. Test reports will be stored in /build/reports.
• gradle javadoc will create the JavaDocs for the respective submodule. The results will be stored in /export/javadoc.
• gradle build runs all the tasks from above.
• gradle publish<submodule>PublicationToMavenLocal publishes the respective submodule to the local maven repository. If you have set up a project to resolve dependencies from the local repository, you can conveniently test your local changes without pushing and publishing them.

Bundle

las2peer has a modular structure and many dependencies. However, most installations use all modules together, this is why we provide a bundle of all submodules and their dependencies in one single jar. The build script for the bundle can be found in /bundle.

The build script provides the following tasks:

• gradle shadowJar will build the fat jar. The jar will be stored in /export/jars.
• gradle publishBundlePublicationToMavenLocal publishes the bundle to the local maven repository.

Super Build Script

To make life easier for developers, this repository contains a build script for conveniently building multiple submodules.

• gradle buildOnly will run publish<submodule>PublicationToMavenLocal on each submodule
• gradle buildOnlyNoBundle will run publish<submodule>PublicationToMavenLocal on each submodule except for the bundle

Documentation

JavaDocs of the latest release can be found online:

• Core
• Web Connector
• Rest Mapper

CI

Every commit to the develop branch is built by GitHub actions and will be published as a snapshot to our Archiva. Releases are drafted from the master branch.

Importing

From Version 1.4.0 on, las2peer-bundle is available on Maven Central. To import las2peer into your project, add the following dependency to your build file:

implementation "io.github.rwth-acis.org.las2peer:las2peer-bundle:1.4.0"

As a repository, only Maven Central is required.