OpenSplice Community v6.4 Release

I’m delighted to announce that OpenSplice Community Edition v6.4 is now available to the Open Source Community. The new release is the most up-to-date OpenSplice Community Edition and is based on the OpenSplice Enterprise v6.4 code base.

The new release is in keeping with our revised Open Source policy that OpenSplice Community Edition releases will closely follow OpenSplice Enterprise Edition releases, providing the Open Source Community with access to the latest and greatest OpenSplice code base.

OpenSplice Community Edition v6.4 includes the following new features:

  • Significant performance improvements both in terms of latency as well as throughput making OpenSplice DDS v6.4 the fastest DDS implementation on the market (with end-to-end latencies over a gigabit Ethernet as low as 42 microseconds)
  • TCP/IP support for the DDSI2 networking service, enabling data sharing with a TCP/IP endpoint, for example an application running in a Cloud-based datacenter.
  • The first GA implementation of the new DDS ISO C++ PSM (API) available on the market. The new C++ API greatly reduces the complexity of developing DDS applications, and improves efficiency and safety.

In addition, numerous other updates and improvements have been made to the code base since the previous v6.3 release. These include performance and footprint improvements, bug fixes and robustness improvements.

For questions about OpenSplice Community Edition, please read our FAQ at:

Open Source OpenSplice Community Edition v6.4 downloads are now available from:

We believe that the latest version of OpenSplice Community Edition is the best Open Source infrastructure for data sharing in complex and large scale distributed systems. Please have fun trying it out and let us know your feedback!

DDS Web Programming with dscript

In the past few months I have had quite a few animated discussions with members of the Data Distribution Service (DDS) community (read other vendors) with respect to the kind of “Web” integration we should provide for DDS. Looking at the trend on HTML5/JavaScript clients for me it was a no-brainer that our focus should have been on providing two things:

  • A simple DDS abstraction to allow JavaScript programmers to do Publish / Subscribe (Pub/Sub) from the browser (or Node.js).
  • A seamless integration between web client and native DDS clients.

Hard to believe… I was the voice out of the choir. The rest of the crowd seamed to believe, or had some obscure interest to believe, that what really mattered was to provide DDS with a W3C WebService API. Yack! The result of this is a Web-Enabled recommended (not yet adopted) OMG specification that actually has nothing to do with the Web (other than with heavy weight old fashioned Web Services). In essence the end result was more a “Web-Disabled” DDS.

So what to do? Well, if you know me, you’ve already guessed. As I did with simd-cxx for the DDS C++ API I’ve created a prototype of what the real Web-DDS technology should be like. After some fun hacking I am happy to unveil dscript.

I’ve posted an intro presentation on slideshare, but I’ll try to summarize the key points of dscript below.

dscript is composed by two elements:

  • Client Side (dscript.js): JavaScript/CoffeeScript framework that provides DDS-like abstractions
  • Server Side ( A Router that transparently bridges data between matching DDS entities, e.g. Browser-2-Browser, DDS-2-Browser and Browser-2-DDS

Dscript diagram

The client side provides a simplified and refined semantics for the DDS entities, for instance dscript reduces the DDS concepts to Topics, DataReaders, DataWriters and QoS — DomainParticipant and Publishers are managed for you.

The API is reactive and considers DataReaders as the source for a stream of data. This data can be handled by the application or bound to a data cache (notice the cache is not part of the DataReader) that provides a higher order function for processing contained data.

The server side minimizes the number of DataReader / DataWriter created to manage the established sessions and deals with entity garbage collection too.

Enough talking, let me show you some code that actually publishes some data:

Dscript code

And here is some code that consumes data:

Dscript code consumes

Pretty Cool, isn’t it? The good news is that dscript.js and are Open Source projects available on GitHub.

Good Hacking!