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The RJ concurrent programming package provides a programming model like that found in the JR concurrent programming language.  The RJ package is written in Java and so extends Java with JR-like features.

RJ and this web page are under development.  RJ presently implements nearly all of JR's features, including easy remote virtual machine and remote object creation, and a rich collection of synchronization mechanisms (remote method invocation, dynamic process creation, rendezvous, asynchronous message passing, semaphores, concurrent invocation, and shared variables).  Stayed tuned for more ...

• Current version: RJ version 001.01 (2017-05-10)
  (requires Java 1.8 to run)
• Earlier version: RJ version 001.01 (2014-09-12)
  (requires Java 1.7 to run)

The above two versions are based on slightly different sources, with the Java 1.8 version containing a few additional RJ features.  The RJ version for Java 1.7 will work too with Java 1.8.  Our future development efforts, though, will likely use some new Java 1.8 features; at that point, the newest version of RJ will no longer work with Java 1.7.

• To get a quick idea of what RJ code looks like, compare JR and RJ programs for the classic Dining Philosophers Problem:
  • Here's the JR version:
    • Main.
    • Philosopher.
    • Servant.
  • Here's the RJ version:
    • Main.
    • Philosopher.
    • Servant.
• The vsuite that comes with RJ contains numerous programs, e.g., see those in vsuite/misc.
• For RJ coding details, please see the (not entirely up-to-date) javadoc in source/javadoc/public/index.html.

• R.A. Olsson and T. Williamson. RJ: A Java Package Providing JR-like Concurrent Programming. SOFTWARE--Practice and Experience. Volume 46, Issue 5, pages 685-708 (May 2016).
• See related papers on the JR concurrent programming language. 

Personnel

• lead contributors
•  Prof. Ronald A. Olsson
•  Todd Williamson

• PySy: a Python package for JR-like concurrent programming.