puniverse/quasar

Fibers, Channels and Actors for the JVM

Source code at GitHub http://docs.paralleluniverse.co/quasar/

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  "createdAt": "2013-03-27T14:51:24Z",
  "defaultBranch": "master",
  "description": "Fibers, Channels and Actors for the JVM",
  "fullName": "puniverse/quasar",
  "homepage": "http://docs.paralleluniverse.co/quasar/",
  "language": "Java",
  "name": "quasar",
  "pushedAt": "2024-01-21T07:18:32Z",
  "stargazersCount": 4575,
  "topics": [
    "actors",
    "concurrency",
    "fibers",
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  "updatedAt": "2025-11-24T09:05:33Z",
  "url": "https://github.com/puniverse/quasar"
}

Quasar
Fibers, Channels and Actors for the JVM

Getting started

Add the following Maven/Gradle dependencies:

Feature	Artifact
Core (required)	`co.paralleluniverse:quasar-core:0.8.0`
Actors	`co.paralleluniverse:quasar-actors:0.8.0`
Reactive Streams	`co.paralleluniverse:quasar-reactive-streams:0.8.0`
Disruptor Channels	`co.paralleluniverse:quasar-disruptor:0.8.0`
Kotlin (JDK8+)	`co.paralleluniverse:quasar-kotlin:0.8.0`

Or, build from sources by running:

./gradlew install

Usage

You can also study the examples here.

You can also read the introductory blog post.

When running code that uses Quasar, the instrumentation agent must be run by adding this to the java command line:

-javaagent:path-to-quasar-jar.jar

Pulsar is Quasar’s extra-cool Clojure API
Comsat integrates Quasar with the JVM’s web APIs

Getting help

Please make sure to double-check the System Requirements and Troubleshooting sections of the docs, as well as at currently open issues.

Questions and suggestions are welcome at this forum/mailing list.

You can also open a new GitHub issue especially for bug reports and feature requests but if you’re not sure please first get in touch with the community through the forum/mailing list.

Contributions (including Pull Requests)

Please have a look at some brief information for contributors.

License

Quasar is free software published under the following license:

Copyright (c) 2013-2018, Parallel Universe Software Co. All rights reserved.

This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation

  or (per the licensee's choosing)

under the terms of the GNU Lesser General Public License version 3.0
as published by the Free Software Foundation.