Eclipse uProtocol Java Library

Table of Contents

• Overview
• Getting Started
  • Importing the Library
  • Using The Library

Overview

This library implements the uProtocol Language Specific Library Requirements for Java defined in uProtocol Specifications. The library is organized into packages that are described in SDK Packages below. Each package contains a README.adoc file that describes the purpose of the package and how to use it.

The module contains the factory methods, serializers, and validators for all data types defined in the specifications, and any data models that either haven’t or couldn’t be defined in up-core-api yet.

Getting Started

Importing the Library

To pull the Library from maven central, setting ${uprotocol.version} to the latest version of this library in your pom.xml file:

<!-- uProtocol Core -->
<dependency>
    <groupId>org.eclipse.uprotocol</groupId>
    <artifactId>up-java</artifactId>
    <version>${uprotocol.version}</version>
</dependency>

Using The Library

Table 1. Package Folders

Folder	Purpose
builder or factory	Contains factory methods for creating uProtocol data types
serializer	Contains serializers to convert the objects into byte or string form representation of said object
validator	Contains validators to validate the data types and report errors if the objects are missing or incorrect

Table 2. SDK Packages

Package	Purpose
uuri	Uniform Resource Identifier (RFC3986), how uProtocol addresses things (devices, software, methods, topics, etc…​) on the network
uuid	Identifier used to uniquely identify (and timestamp) messages that are sent
transport	Interface declaration used for bidirectional point-2-point communication between uEs. This interface is then implemented by uPClient libraries for a given underlining transport (ex. Binder, MQTT, Zenoh, SOME/IP, DDS, HTTP, etc…​)
cloudevent	Common way to represent uProtocol messages using CloudEvent data model used by some transports (ex. MQTT, HTTP, etc…​)
rpc	RPC client and server-side interfaces that are to be implemented by uLink libraries