olca-proto

olca-proto is a Protocol Buffers implementation of the olca-schema format. It also defines a gRPC service interface for calling openLCA functions.

Usage

If you use Maven, just add the following dependency:

<dependency>
  <groupId>org.openlca</groupId>
  <artifactId>olca-proto</artifactId>
  <version>2.0.0</version>
</dependency>

For the gRPC service interface, add this:

<dependency>
  <groupId>org.openlca</groupId>
  <artifactId>olca-grpc</artifactId>
  <version>2.0.0</version>
</dependency>

Building from source

The Java source code is generated from proto3 files in the proto folder of this project. The olca.proto file contains the definition of the openLCA schema format and is generated via the osch tool of the olca-schema project.

To generate the Java source code, we use the protobuf-maven-plugin:

mvn compile

You need to have the protoc compiler with the gRPC plugin for Java installed. One way to install it, is to just put the binaries of these tools into your system path. The protoc binary can be downloaded from its GitHub release page: https://github.com/protocolbuffers/protobuf/releases. The gRPC Java plugin can be downloaded from the Maven Central Repository: https://repo1.maven.org/maven2/io/grpc/protoc-gen-grpc-java/. You may need to rename the plugin to protoc-gen-grpc-java and set the executable flags:

chmod +x protoc-gen-grpc-java