DDS and SOA Interfaces to ESB

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1 DDS and SOA Interfaces to ESB NCOIC Plenary, VA Beach 29 Mar 2007 Joe Schlesselman NCOIC OS&P WG Chair Gerardo Pardo-Castellote CTO & Co-Author DDS Specification

2 Agenda Objective is to answer these questions What is DDS? What makes DDS different? Why does DDS fit with SOA?

3 Middleware Information Models Point-to-Point Telephone, TCP Simple, high-bandwidth Leads to stove-pipe systems Client-Server File systems, Database, RPC, CORBA, DCOM Good if information is naturally centralized Single point failure, performance bottlenecks DDS Publish/Subscribe Messaging Magazines, Newspaper, TV Excels at many-to-many communication Excels at distributing time-critical information Replicated Data Libraries, Distributed databases Excels at data-mining and analysis

4 The DDS Standard Data Distribution Service for Real-Time Systems Adopted in June 2003, revised June 2005 Specification of API for Data-Centric Publish-Subscribe in realtime distributed systems. Adopted Interoperability Protocol in Jun 06 Multiple Implementations 3 commercial, 3 open source Several more in-house Vibrant open community DDS SIG at OMG OMG DDS tutorials, DDS Focus days, Real-Time Embedded Systems Workshop Broad adoption

5 DDS Communications model Provides a Global Data Space that is accessible to all interested applications. Data objects addressed by Domain, Topic and Key Subscriptions are decoupled from Publications Contracts established by means of QoS Automatic discovery and configuration Participant Pub Pub Participant Sub Track,1 Track,2 Track,3 Sub Participant Global Data Space Participant Pub Alarm Sub Participant

6 DDS communications model Failed to produce data Listener Data Writer Circle Domain Participant Offered QoS Failed to get data Listener Data Reader Circle Domain Participant Offered QoS Publisher declares information it has and specifies the Topic and the offered QoS contract and an associated listener to be alerted of any significant status changes Subscriber declares information it wants and specifies the Topic and the requested QoS contract and an associated listener to be alerted of any significant status changes DDS automatically discovers publishers and subscribers DDS ensures QoS matching and alerts of inconsistencies

7 Quality of Service (QoS) for Real-Time QoS Policy QoS Policy Volatility Infrastructure Delivery DURABILITY HISTORY READER DATA LIFECYCLE WRITER DATA LIFECYCLE LIFESPAN ENTITY FACTORY RESOURCE LIMITS RELIABILITY TIME BASED FILTER DEADLINE CONTENT FILTERS USER DATA TOPIC DATA GROUP DATA PARTITION PRESENTATION DESTINATION ORDER OWNERSHIP OWNERSHIP STRENGTH LIVELINESS LATENCY BUDGET TRANSPORT PRIORITY User QoS Presentation Redundancy Transport

8 Agenda Objective is to answer these questions What is DDS? What makes DDS different? Data centricity Performance Configurability and QoS Why does DDS fit with SOA?

9 What makes DDS different from other messaging e.g. JMS, MQSeries Data-centricity High level of data abstraction: Domain, Topic, Key Proven scalable model for RT systems Smart services such as: Ownership, Time-Based Filters, Content-Based Filters Persistence, Keep-Last History Directly supports state propagation/caching High Performance Real-time messaging As fast as the network transport can handle Scalability Configurability by QoS Wide range of applicability: Enterprise to real-time Publish-Subscribe infrastructure: Fault-tolerance Subsumes message-oriented and data-centric

10 Data-Distribution and Real-Time Messaging Technologies and Standards Web Services Java RTSJ (soft RT) RTSJ (hard RT) Java/RMI Java/JMS CORBA RT CORBA Data Distribution Service / DDS Non-real-time Soft real-time Hard real-time Extreme real-time MPI Adapted from NSWC-DD OA Documentation

11 Low DDS Latency DDS/GSOAP/JMS/Notification Service Comparison - Latency DDS JMS GSOAP Notification Service Message Message Length Size (samples) (bytes) Adapted from Vanderbilt presentation at July 2006 OMG Workshop on RT Systems

12 Low DDS Jitter DDS/GSOAP/JMS/Notification Service Comparison - Jitter 100 Standard Deviation (usecs) DDS JMS GSOAP Notification service Message Length Message (samples) Size (bytes) Source: Vanderbilt presentation at July 2006 OMG Workshop on RT Systems

13 DDS Throughput 25 times better than JMS [1000's sample/s] Throughput with a single publisher ( 2KB messages ) RTI DDS JMS CPU load [%] Platform: Linux 2.6 on AMD Athlon, Dual core, 2.2 GHz

14 Agenda Objective is to answer these questions What is DDS? What makes DDS different? Why does DDS fit with SOA?

15 SOA Service Orientation: an architectural style promoting a loosely-coupled component-based approach where each component offers one or more services. These services encapsulate some business logic behind well-defined service interfaces. Services communicate using standard protocols and can be accessed without knowledge of their implementation or platform. Many technologies can be used to implement SOA systems: WebServices, JMS, DDS, CORBA, MQSeries In practice for enterprise applications the most used technologies are: For request-reply interactions WSDL to define Interfaces XML to define data SOAP as the protocol For pub-sub and messaging JMS for pub-sub messaging Emerging: WS-Eventing, WS-Notification (XML based) DDS is a better fit for messaging in Real-Time and near real-time systems These technologies are typically included inside an ESB

16 DDS and SOAP comparison WS/SOAP/CORBA Distributed service Client/server Remote method calls Reliable transport Best for Configuration File transfer Synchronous transactions Sporadic request-reply DDS (JMS, WS-Events) Distributed data & events Publish/subscribe One-way messages Configurable QoS Best for Hi-performance 1 to many Dynamic, unreliable transports Flexible delivery requirements Events, High performance messaging DDS and SOAP address complementary needs Distributed systems need both!

17 Information-Oriented SOA for Pub-Sub NOT THIS: (connection-oriented) oriented) BUT THIS: Shared Operational Picture = System Components Use of an Information Oriented design for Pub-Sub applications avoids creating stovepipe systems

18 DDS as a Web-Service Exposing DDS as a Web-Service (WS-DDS) WS-DDS provides pub-sub data-distribution This is another (WSDL) API to access DDS Advantage: WS-DDS would be accessible from any tool that can invoke a web-service Disadvantage: WSDL and XML marshaling degrade performance

19 Enabling Real-Time of SOA Open, Standard Platform Enabling Integration from the Enterprise Service Bus (ESB) to the Real-Time Service Bus (RTSB) Enterprise App Enterprise App Enterprise App Technologies: DDS, CORBA SQL mappings SOA mappings DDS SQL WSDL Global Data Space ESB RTSB SOAP JMS.NET DDS SQL/RDBMS SOA/Web Services (J2EE, NET, ) Enterprise Databases Web Services Real-Time Systems DDS SQL RT Application DDS SQL Embedded App.

20 Thank you Joe Schlesselman Gerardo Pardo-Castellote

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