Message Oriented Architecture
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This document discusses a message-oriented architecture for ground control systems. It proposes integrating ground control applications using an asynchronous message bus to decouple components. The architecture is presented in 4 steps: 1) Components communicate via the message bus. 2) Business logic is separated from user interfaces. 3) On-board systems integrate with the message bus. 4) Manual operations integrate via web services. Benefits include asynchronous/synchronous communication, scalability, and integrating existing ground control systems.
Message Oriented Architecture
- 1. European Ground System Architecture Workshop (ESAW 2009) Message Oriented Architecture © GMV, 2009 Property of GMV All rights reserved
- 2. Agenda 1 Overview 2 Message Oriented Architecture 3 Message Bus 4 Ground Control System Message Oriented Architecture 5 Monitoring & Control System Message Oriented Architecture 6 Conclusions 7Q&A 14/05/2009 ESAW 2009 Page 2 © GMV, 2009
- 3. Overview Event Logger (Java RCP) NETCOM GSTP (Alignment of SCOS- Message Bus 2000 release 5.0 with hifly) Event Logger Message Bus TCP/IP Integration of a Commercial Message CPD Bus in hifly as Proof of Concept in the scope of NETCOM GSTP project TCP/IP PDSserver 14/05/2009 ESAW 2009 Page 3 © GMV, 2009
- 4. Objetives Take advance of the lessons learnt on the NETCOM project in order to: – Propose an Architecture for integration of the Ground Control System applications – Propose a Message Architecture for the Satellite Control System 14/05/2009 ESAW 2009 Page 4 © GMV, 2009
- 5. Message Oriented Architecture Key Points Ground Control Application Integration Ground Control Applications interact each other in the same way Application Integration Asynchronous component communication Components are no longer waiting for response neither connected Message continuously each others Oriented Architecture Decouple components Asynchronous Decouple Components interface are Communications Components messages, no more function calls 14/05/2009 ESAW 2009 Page 5 © GMV, 2009
- 6. Message Oriented Architecture Ground Control Application Integration File Transfer Remote Procedure Invocation Messages 14/05/2009 ESAW 2009 Page 6 © GMV, 2009
- 7. Message Oriented Architecture Through Asynchronous Communication CORBA 2 – Synchronous SOAP 1.1 – Synchronous CORBA 3 – Asynchronous SOAP 1.2 – Asynchronous Messages Bus – Asynchronous 14/05/2009 ESAW 2009 Page 7 © GMV, 2009
- 8. Message Oriented Architecture Through Decouple Components Function as interface – Very tight couple Remote Process Call – Tight couple CORBA – Loosely couple SOAP & WSDL – Loosely couple Messages Bus – Decouple 14/05/2009 ESAW 2009 Page 8 © GMV, 2009
- 9. Message Bus Asynchronous/Synchronous Communications Asynchronous communication Point to Point – Implemented by a Queue interface Publisher - Subscribers – Implemented by Topic interface Message Acknowledgment – Implemented by ACK message Heartbeat – heart beat message Synchronous communication Request and Reply (Point to Point) – Implemented by two Queues 14/05/2009 ESAW 2009 Page 9 © GMV, 2009
- 10. Message Bus Messages definition Data format XML Fixed length data fields Proprietary format (Binary format) Object Format Persistence Versioning Sequencing 14/05/2009 ESAW 2009 Page 10 © GMV, 2009
- 11. Message Bus Interoperability Programming languages C/C++ Java with support for Java Messaging Service Fortran Python Operating Systems Linux Solaris Windows Message Version Message field Version Router 14/05/2009 ESAW 2009 Page 11 © GMV, 2009
- 12. Message Bus Commercial Bus Messages Open Source - ActiveMQ from Apache COTS – TIBCO used in NETCOM prototype Most popular Commercial Message Bus Interoperability C++/Java JMS Interoperability C++/Java JMS http://activemq.apache.org http://www.tibco.com Open Source – Message Queue from COTS – OpenFusion (CORBA 3 message service) Sun Interoperability Java/C++ Interoperability C++/Java JMS http:www.prismtechnologies.com/products/openfusion https://mq.dev.java.net Open Source – xmlBluster Java JMS fully implemented in Java Interoperability C++/Java JMS http://www.xmlblaster.org 14/05/2009 ESAW 2009 Page 12 © GMV, 2009
- 13. Ground Control System Message Oriented Architecture 14/05/2009 ESAW 2009 Page 13 © GMV, 2009
- 14. Ground Control System Message Oriented Architecture Step 1 Telecommand Variable Event History Packet Logger Display Message Bus Event Logger Telecomman Telemetry Bussiness ds Bussiness Bussines PDSserver Logic Logic Logic EV/TC/TM Packets Archive TCP/IP Packetizer Releaser 14/05/2009 ESAW 2009 Page 14 © GMV, 2009
- 15. Ground Control System Message Oriented Architecture Step 2 14/05/2009 ESAW 2009 Page 15 © GMV, 2009
- 16. Ground Control System Message Oriented Architecture Step 3 14/05/2009 ESAW 2009 Page 16 © GMV, 2009
- 17. Ground Control System Message Oriented Architecture Step 4 PIF On-Board TimeTag MISC TCSpacon Multiplexer Queue Model Releaser Monitoring Message Bus Event Logger Telecommand PDSserver Telemetry Manual Stack Bussiness Bussiness Packetizer Verifier WebServices EV/TC/TM Bussines Logic Logic Logic HTTP/SOAP Packets Archive Web Manual Web Event Stack with Logger with AJAX AJAX 14/05/2009 ESAW 2009 Page 17 © GMV, 2009
- 18. Conclusions Benefits from Message Oriented Architecture Support for Asynchronous and Synchronous component communication. Support N-layer architecture Hot plug/unplug components Support to integrate with Ground Control System Components 14/05/2009 ESAW 2009 Page 18 © GMV, 2009
- 19. Conclusions Proposed a Roadmap for a Message Architecture for the Satellite Control System in four steps based on an Open Source Commercial Message Bus (activeMQ). Proposed the first step of an Architecture for integration of the Ground Control System applications based on a Commercial Message Bus. 14/05/2009 ESAW 2009 Page 19 © GMV, 2009
- 20. Thank you Jesús Santana & T. Lopez-Ciudad Ground Control Systems Email: jsantana@gmv.com; tlopez@gmv.com www.gmv.com © GMV, 2009 Property of GMV All rights reserved