Mélodium

Mélodium is a stream-oriented language, focusing on events and treatments, enabling strong scalability and parallelization safely.

Description

Mélodium is a tool and language for data stream manipulation, event reaction, building software shared across different machines.
This is accomplished using the concept of treatments that applies on data, with a track approach that makes any program scalable, implicitly parallelizable, and asynchronous.

Fitting uses cases are, among others:

• managing many small requests;
• optimizing execution schedule;
• managing large amount of data coming as stream or chunked;
• dealing with limited resources;
• sharing program load across different machines.

For more exhaustive explanations, please refer to the Mélodium Language book.

Mélodium is under development and continously being defined and improved. Released documentation is available on docs.rs and standard reference on melodium.tech.

Download & installation

Mélodium releases are available for multiple platforms at Mélodium.tech.

Command-line usage

Mélodium is distributed as a program that have extensive and growing CLI, here are very basic examples.

Launch a Mélodium program:

melodium <FILE>

or

melodium run <FILE>

or launch a specific command in Mélodium program:

melodium run <FILE> <CMD> [ARGS…]

See the commands and options of a program:

melodium info <FILE>

Check a Mélodium program validity:

melodium check <FILE>

To see the exhaustive commands and options list:

melodium help

Please refer to the Mélodium Project, Mélodium Book, or Mélodium Documentation for usage and more examples.

Compilation

Compile from source

Mélodium is fully written in Rust, and just need usual cargo build.

git clone https://gitlab.com/melodium/melodium.git
cd melodium
cargo build --package melodium

Install from crates.io

Mélodium can also be directly installed from crates.io.

cargo install melodium

Development

The development of Mélodium project is hosted by GitLab. Direct channels and news are available on Discord.

Origin

Mélodium were first developed during research in signal analysis and musical information retrieval, in need of a tool to manage large amount of records and easily write experimentations, without being concerned of underlying technical operations. It has been presented in this thesis (in French).

The first implementation was in C++ and ran well on high performance computers, such as those of Compute Canada. That tool appeared to be really useful, and the concepts used within its configuration language to deserve more attention. This first experimental design is still available at https://gitlab.com/qvignaud/Melodium.

The current project is the continuation of that work, rewritten from ground in Rust, and redesigned with a general approach of massively multithreaded data flows in mind.

Licence

This software is free and open-source, under the EUPL licence.

Why this one specifically? Well, as this project have a particular relationship with cultural world, probably more than most other softwares, it is important to have a strong legal basis covering also the notion of artwork. In the same way, as no culture is more important than another, it was important to have a licence readable and understanble by most of people. The EUPL is available and legally valid in 23 languages, covering a large number of people.

Then, the legal part:

Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in compliance with the Licence. You may obtain a copy of the Licence at: https://joinup.ec.europa.eu/software/page/eupl

Unless required by applicable law or agreed to in writing, software distributed under the Licence is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Licence for the specific language governing permissions and limitations under the Licence.

And do not worry, this licence is explicitly compatible with the ones mentionned in its appendix, including most of the common open-source licences.