Dds interop demo_washington_dds_2011_03_01
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The document outlines a DDS interoperability demonstration showcasing collaboration between four vendors (PrismTech, Real-Time Innovations, Twinoaks, IBM, Gallium Visual Computing) using the Data Distribution Service (DDS) standard. It details multiple scenarios to demonstrate interoperability across different platforms, data types, and Quality of Service (QoS) parameters, highlighting features like network robustness and filtering capabilities. The conclusion affirms the effectiveness of DDS interoperability and ongoing vendor commitment to further scenarios.
Dds interop demo_washington_dds_2011_03_01
- 1. dds/2011-03-01 DDS Interoperability Demo March 2011 PrismTech Real-Time Innovations TwinOaks IBM Gallium Visual Computing Corporation Systems
- 2. History: DDS the Standards Data Distribution Service for Real-Time Systems (DDS) API for Data-Centric Publish-Subscribe distributed systems Adopted in June 2003 Finalized in June 2004 Revised June 2005, June 2006 Spec version 1.2: http://www.omg.org/spec/DDS/1.2/ Adopted in July 2006 Revised in July 2007 Spec version 2.1: http://www.omg.org/spec/DDS-RTPS/2.1/ Related specifications DDS Extensible Topics UML Profile for DDS DDS for Light-Weight CCM Multiple (9+) Implementations 2
- 3. Who is participating? PrismTech Real-Time Innovations TwinOaks IBM Gallium Visual Computing Corporation Systems 3
- 4. What you will see today #1 Interoperability works! #2 Multiple scenarios You will see interoperability along many dimensions: Discovery Different platforms (Linux, Windows) Not-trivial Data-Types with Keys Unicast & Multicast, both reliable and best efforts One to Many and Many to one communications Different Topics Different Qos: RELIABILITY, OWNERSHIP, DURABILITY Filters: time, content, … #3 Interoperability does not compromise performance Direct communication. No bridges!! 4
- 5. Eight demo scenarios Discovery & Basic connectivity Request / Offered QoS (RELIABILITY, OWNERSHIP) Network Interruption Multiple Topics & Instances Exclusive Ownership Time and Content Filters All this and more between multiple vendors across different platforms!! 5
- 6. Demo Setup DDS Three DDS Topics: Global Data Space Square, Circle, Triangle DDS Data type: Shape: color : string x : long y : long size : long Color is instance Key QoS: Deadline, Liveliness Reliability, Durability History, Partition 6 Ownership
- 7. 1. Discovery & Basic Connectivity DDS Global Data Space Each vendor publishes one instance (color) All vendors subscribe to Square and receive from everyone You will see: Discovery Multi Platform Data Interoperability 7
- 8. 2. Request/Offered QoS (RELIABILITY) BEST_EFFORT RELIABLE Each vendor publishes one DDS instance of each Topic Global Data Space Square RELIABLE Circle BEST_EFFORT Triangle BEST_EFFORT Everybody Subscribes to Square RELIABLE Circle BEST_EFFORT Triangle RELIABLE You will see: Square MATCH Circle MATCH 8 Triangle no MATCH
- 9. 3. Request/Offered QoS (OWNERSHIP) EXCLUSIVE SHARED Each vendor publishes one DDS instance of Square, Circle, Global Data Space and Triangle Squares SHARED Circles EXCLUSIVE Triangle EXCLUSIVE Everybody Subscribes to Square SHARED to Circle EXCLUSIVE to Triangle SHARED You will see: QoS mis-match QoS agreement 9 For OWNERSHIP
- 10. 4. Durability RTI publishes instance of DDS • Square with DURABILITY Global Data Space TRANSIENT, HISTORY 400 • Circle with DURABILITY TRANSIENT, HISTORY 400 Everybody else Subscribes HISTORY 200 to Square VOLATILE to Circle TRANSIENT You will see: No historical data for VOLATILE Historical data for TRANSIENT 10
- 11. 5. Robustness to network interruption Each vendor publishes DDS one instance (color) Global Data Space All vendors subscribe to Square and receive from everyone Disconnect 2 nodes and then reconnect You will see: Connected nodes keep communicating Recovery after reconnect 11
- 12. 6. PARTITION QoS BEST_EFFORT RELIABLE Each vendor publishes one DDS instance of Square, Circle, Global Data Space and Triangle Squares PARTITION “A” Circles PARTITION “B” Triangle PARTITION “*” Everybody Subscribes to Square, Circle, Triangle all on PARTITION “A” You will see: Square on ALL Circle on NONE 12 Triangle on ALL
- 13. 7. OWNERSHIP All vendors subscribe to DDS Square Global Data Space OWNERSHIP EXCLUSIVE Each vendor successively Publishes MAGENTA Square EXCLUSIVE, each with increasing size and STRENGHT You will see: Take over when stronger writer appears Failover when stronger writer goes away 13
- 14. 8. TIME_BASED Filter Each vendor publishes DDS one instance (color) of Global Data Space Square and Circle All vendors subscribe to Square without FILTER Circle with TIME_BASED filter You will see: All Square samples Sub-sampled Circle 14
- 15. 9. Content-Based Filter Each vendor publishes DDS one instance (color) of Global Data Space Square All vendors subscribe to Square with ContentBased Filter You will see: Squares that pass the filter 15
- 16. Interoperability demonstrated along many dimensions Today we demonstrated interoperability between 4 vendors for: Discovery Different platforms (Windows, several Linux distros) Different Topics and Data-Types Different Qos (RELIABILITY, DURABILITY, OWNERSHIP) Unicast & Multicast, both reliable and best efforts One to Many and Many to one communications Robustness to network interruption Time Based Filters Content Based Filter 16
- 17. Conclusions DDS Interoperability Works We will continue working on additional scenarios Vendors are committed to interoperability The DDS Standard and DDS-RTPS Interoperability standards are complete and usable Two non-OMG vendors were able to use the OMG standard documents and produce interoperable DDS products DDS is the only portable and interoperable publish-subscribe infrastructure Come see more at the booths! 17