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Getting Started in DDS with C++ and Java

The document provides an overview of the OMG Data Distribution Service (DDS) for C++ and Java programmers, detailing its introduction in 2004 to address data distribution challenges in various applications. It highlights the evolution of middleware, the interoperability and standards set by DDS, as well as the language-independent APIs and QoS policies that are central to DDS functionality. Additionally, the transition to new programming language mappings aims to simplify DDS API usage and enhance natural integration with the languages.

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Angelo Corsaro, Ph.D. Chief Technology Officer PrismTech OMG DDS SIG Co-Chair angelo.corsaro@prismtech.com OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Getting Started with DDS For C++ and Java Programmers 1
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./background-info 2
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS The OMG DDS The OMG DDS Standard ‣ Introduced in 2004 to address the Data distribution challenges typical of Defense and Aerospace Mission Critical Applications ‣ Key requirements for the standard were high performance and scalability from embedded to ultra-large-scale deployments ‣ Today recommended by key administrations worldwide and widely adopted well beyond Aerospace and Defense in domains, such as, Automated Trading, Simulations, SCADA, Telemetry, etc. 3
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS Recommendations Increasingly Mandated/Recommended by Administrations ‣ US Navy: Open Architecture ‣ DISR/DISA: Net-centric Systems ‣ EuroControl: Air Traffic Control Center Operational Interoperability ‣ QinetiQ & MILVA: Recommending DDS for Vehicles Electronic Architecture ! The infrastructure evolution cycle is churning… – New -> Emerging -> Standard -> Commodity – Middleware is emerging as OS declines ! …DDS is maturing… – OMG focus – Wire spec – Tools – Enterprise integration – Multiple products fielded – Deployed applications! ! …and adoption is on the rise – Navy – DISR – FCS/SoSCOE – Many significant applications 4
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS The OMG Data Distribution Service DDS v1.2 API Standard ‣ Language Independent, OS and HW architecture independent ‣ DCPS. Standard API for Data- Centric, Topic-Based, Real-Time Publish/Subscribe ‣ DLRL. Standard API for creating Object Views out of collection of Topics Object/Relational Mapping Ownership Durability Content Subscription Minimum Profile Data Centric Publish/Subscribe (DCPS) Data Local Reconstruction Layer (DLRL) DDS Interoperability Wire Protocol Application UDP/IP Real-Time Publish/Subscribe Protocol 5
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS The OMG Data Distribution Service DDS v1.2 API Standard ‣ Language Independent, OS and HW architecture independent ‣ DCPS. Standard API for Data- Centric, Topic-Based, Real-Time Publish/Subscribe ‣ DLRL. Standard API for creating Object Views out of collection of Topics Object/Relational Mapping Ownership Durability Content Subscription Minimum Profile Data Centric Publish/Subscribe (DCPS) Data Local Reconstruction Layer (DLRL) DDS Interoperability Wire Protocol Application UDP/IP Real-Time Publish/Subscribe Protocol 5
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS The OMG Data Distribution Service DDS-RTPS v2.1 Wire Protocol Standard ‣ Standard wire protocol allowing interoperability between different implementations of the DDS standard ‣ Interoperability demonstrated among key DDS vendors in March 2009 Object/Relational Mapping Ownership Durability Content Subscription Minimum Profile Data Centric Publish/Subscribe (DCPS) Data Local Reconstruction Layer (DLRL) DDS Interoperability Wire Protocol Application UDP/IP Real-Time Publish/Subscribe Protocol 6
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./dds-foundations 7
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS What is Data Distribution? ‣ Data distribution is about making application defined data available where needed and when needed ‣ Data is a first class concept, it can be created, updated, read and eventually disposed ‣ The last value (or last N- values) of a Data is available VehicleSpeedVehicleSpeedVehicleSpeed plate “A123” “B456” “C789” dx dy 50 0 0 45 10 30 VehiclePositionVehiclePositionVehiclePosition plate “A123” “B456” “C789” x y 101 202 303 404 505 606 [1/2] TrakCo.VehiclePosition struct VehiclePosition { string plate; long x, y; } TrakCo.VehicleSpeed struct VehicleSpeed { string plate; long dx, dy; } Brokers 8
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS What is Data Distribution? ‣ Producer, Consumers as well as Topics are dynamically discovered ‣ A rich set of QoS is used to control the non-functional properties of data (e.g. durability, availability, etc.) [2/2] TrakCo.VehiclePosition struct VehiclePosition { string plate; long x, y; } TrakCo.VehicleSpeed struct VehicleSpeed { string plate; long dx, dy; } VehicleSpeedVehicleSpeedVehicleSpeed plate “A123” “B456” “C789” dx dy 50 0 0 45 10 30 VehiclePositionVehiclePositionVehiclePosition plate “A123” “B456” “C789” x y 101 202 303 404 505 606 Brokers 9
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./dds-topics 10
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data in DDS ‣ The definition of Data in DDS is tied to the definition of a Topic ‣ A Topic is the association between: ‣ Unique Name ‣ Type ‣ QoS ‣ A Topic can have associated a key in order to express data instances identities VehiclePosition TrackCo.VehiclePosition { Reliability Deadline, Priority Transient, ... } TopicType QoS Name [1/2] Topics 11
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data in DDS ‣ A Topic key can be made of an arbitrary number of Topic Type attributes ‣ Each unique key value identify a Topic Instance ‣ Topic Instance, can be Created, Read, Updated, and Disposed (CRUD) [2/2] VehiclePositionVehiclePositionVehiclePosition plate “A123” “B456” “C789” x y 101 202 303 202 101 606 TrakCo.VehiclePositionTopic TopicType Topic Instances Topic Key Topic Instances 12
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./qos 13
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS QoS Model Publisher DataWriter Topic Type QoS Name writes QoS DataWriter Topic Typewrites Subscriber DataReaderreads DataReaderreads ... QoS Name QoS QoS QoS QoS matching ...... QoS QoS Type Matching DomainParticipant DomainParticipant QoS QoS ‣ QoS-Policies provide control over local and end-to-end properties of DDS entities ‣ Local properties controlled by QoS are related resource usage ‣ End-to-end properties controlled by QoS are related to temporal and spatial aspects of data distribution ‣ Some QoS-Policies are matched based on a Request vs. Offered Model thus QoS- enforcement 14
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS QoS Policy Applicabilit y RxO Modifiable DURABILITY DURABILITY SERVICE LIFESPAN HISTORY PRESENTATION RELIABILITY PARTITION DESTINATION ORDER OWNERSHIP OWNERSHIP STRENGTH DEADLINE LATENCY BUDGET TRANSPORT PRIORITY T, DR, DW Y N Data Availability T, DW N N Data Availability T, DW N/A Y Data Availability T, DR, DW N N Data Availability P, S Y N Data Delivery T, DR, DW Y N Data Delivery P, S N Y Data Delivery T, DR, DW Y N Data Delivery T, DR, DW Y N Data Delivery DW N/A Y Data Delivery T, DR, DW Y Y Data Timeliness T, DR, DW Y Y Data Timeliness T, DW N/A Y Data Timeliness TIME BASED FILTER RESOURCE LIMITS ENTITY FACTORY USER DATA TOPIC DATA GROUP DATA LIVELINESS WRITER DATA LIFECYCLE READER DATA LIFECYCLE DR N/A Y Resources T, DR, DW N N Resources Configuratio n DP, DR, DW N Y Configuratio nT N Y Configuratio n P, S N Y Configuratio n T, DR, DW Y N Configuratio n DW N/A Y Lifecycle DR N/A Y Lifecycle QoS Policy Applicability RxO Modifiable QoS Policies 15
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./dds-in-action 16
Brokers OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action 17
Brokers OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y 17
Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y VehiclePositionVehiclePositionVehiclePosition plate x y VehiclePositionVehiclePositionVehiclePosition plate x y 18
Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202 “A123” 101 202 “A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y VehiclePositionVehiclePositionVehiclePosition plate x y VehiclePositionVehiclePositionVehiclePosition plate x y 18
Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202 “A123” 101 202 “A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404 “B456” 303 404 “B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y 18
VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202“A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404“B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 19
VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202“A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404“B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y “C789” 505 606 “C789” 505 606 “C789” 505 606 “A123” 101 202 “B456” 303 404 19
VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202“A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404“B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y “C789” 505 606“C789” 505 606 “A123” 101 202 “B456” 303 404 “C789” 505 606 “C789” 505 606 20
VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202“A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404“B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y “C789” 505 606“C789” 505 606 “A123” 101 202 “B456” 303 404 “C789” 505 606 “C789” 505 606 “A123” 50 0 20
VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202“A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404“B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y “C789” 505 606“C789” 505 606 “A123” 101 202 “B456” 303 404 “C789” 505 606 “C789” 505 606 “A123” 50 0 VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy 21
VehiclePositionVehiclePositionVehiclePosition plate x y “A123” 101 202 “B456” 303 404 Brokers VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy VehiclePositionVehiclePositionVehiclePosition plate x y OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Data Distribution in Action VehiclePositionVehiclePositionVehiclePosition plate x y VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy “A123” 101 202“A123” 101 202 VehiclePositionVehiclePositionVehiclePosition plate x y “B456” 303 404“B456” 303 404 VehiclePositionVehiclePositionVehiclePosition plate x y “C789” 505 606“C789” 505 606 “A123” 101 202 “B456” 303 404 “C789” 505 606 “C789” 505 606 “A123” 50 0 “A123” 50 0 VehicleSpeedVehicleSpeedVehicleSpeed plate dx dy 21
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./cxx-java-psm 22
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS PIM/PSM Approach ‣ The DDS standard is composed by a PIM specified in UML and A PSM specified in IDL ‣ Language specific APIs are derived via IDL-based mappings (e.g. IDL2C++, etc.) PIM (UML) PSM (IDL) C JavaC++ IDL2C IDL2C++ IDL2Java 23
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS What is the problem? ‣ IDL is very good for describing DDS Topic Types, yet... ‣ IDL’s biggest strength, namely (programming) language independence, becomes its biggest weakness when trying to define APIs that are well integrated with a programming language ‣ For some programming languages (e.g. C++) the IDL2C++ mapping is “seasoned” 24
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Why is this a problem? ‣ Resulting DDS APIs are more complicated than they should ‣ API don’t feel natural or ergonomic to programmers ‣ API (esp. for C++) don’t integrate well with standard libraries nor implements common idioms/patterns. 25
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Native C++/Java PSMs ‣ The new C++/Java PSM are derived starting directly from the PIM ‣ The new C++/Java PSM take advantage of all the features available in C++/Java to provide a natural, productive, efficient, safe and portable API PIM (UML) ISO C++ PSM The new PSM simplify DDS programming w/o limiting the expensiveness or introducing limitations in what possible Java 5 PSM 26
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ISO C++ PSM in a Nutshell ‣ Provides transparent, safe, precise and real-time automatic memory management ‣ Takes advantage of C++ Template Meta-programming to automate tasks such as type registration and provide a strongly typed API (no downcast ever!) ‣ Provides a DDS API that exploits Iterators and containers as well as other C++ Standard Types ‣ API is extensible, efficient and portable 27
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Java 5 PSM in a Nutshell ‣ Takes advantage of Java Generics to simplify the API and facilitate tasks such as type registration ‣ Provides a DDS API that exploits Iterators and containers ‣ API is extensible, efficient and portable 28
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Anatomy of a DDS Application ‣ Tree-like dependency between DP->(P,S)->(DR, DW) in creation and life-cycle management ‣ Example: DW alive requires the parent P to be alive ‣ This tree-like dependency allows precise GC of DDS Entities via reference counting DomainParticipant Publisher Subscriber DataWriter DataReader Topic Partition Domain DP: DomainParticipant DR: DataReader P: Publisher DW: DataWriter S: Subscribe 29
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model1 30
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 1 2 31
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 3. Create Topic 1 2 3 32
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 3. Create Topic 4. Create DataWriter 1 2 3 4 33
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 3. Create Topic 4. Create DataWriter 5. Create DataReader 1 2 3 4 4 34
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model1 35
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./cxx 36
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Topics in C++ ‣ Topic are associated to a C++ template class parametrized in the topic type, e.g. Topic<VehiclePosition>, Topic<VehicleSpeed> ‣ Topic types can be described in IDL, XML, UML, and Java ‣ Topic types are mapped to C++ classes having one set of accessors per Topic attribute 37
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Types Mapping ‣ DDS primitive types are mapped to C99/C++ standard types ‣ DDS container types are mapped to standard C++ containers, namely std::vector and std::map 38
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS TopicType Mapping struct VehiclePosition { ! string plate; ! long x; ! long y; }; #pragma keylist VehiclePosition plate IDL Topic Type Definition class VehiclePosition { ! VehiclePosition(); ! VehiclePosition(const std::string& plate, ! ! ! int32_t x, int32_t y); ! virtual ~VehiclePosition(); ! const std::string& plate() const; ! void plate(const std::string& s); ! const int32_t x() const; ! void x(int32_t i); ! const int32_t y() const; ! void y(int32_t i); private: ! // Encapsulated state representation }; C++ Topic Type Mapping 39
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./java 40
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Topics in Java ‣ Topic are associated to a Java Generic class parametrized in the topic type, e.g. Topic<VehiclePosition>, Topic<VehicleSpeed> ‣ Topic types can be described in IDL, XML, UML, and Java ‣ Topic types are mapped to Java classes having one set of accessors per Topic attribute ‣ Properly annotated, user provided Java classes, can be used as topic types w/o the need of code generation 41
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Types Mapping ‣ DDS primitive types are mapped to Java primitive types ‣ DDS container types are mapped to standard Java containers DDS Type Java Type Boolean boolean Char8 char Char32 int Byte byte Int16 short UInt16 short Int32 int Uint32 int Int64 long Uint64 long Float64 double Float32 float string<Char8> String string<Char32> String sequence<T> Collection map<K,T> java.util.Map T[] T[] 42
Java Topic Type Mapping OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS TopicType Mapping class VehiclePosition { public VehiclePosition() { /* impl */ } public VehiclePosition(String plate, ! ! ! int x, int y) { /* impl */} String getPlate() { /* impl */ } void setPlate(String plate) { /* impl */ } int getX() { /* impl */ } void setX(int x) { /* impl */ } int getY() { /* impl */ } void setY(int y) { /* impl */ } // Private state implementation } struct VehiclePosition { ! string plate; ! long x; ! long y; }; #pragma keylist VehiclePosition plate IDL Topic Type Definition 43
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS JavaTopicType Definition class VehiclePosition { @key private string plate; private int x; private int y; public VehiclePosition() { } public VehiclePosition(String plate, ! ! ! int x, int y) { this.plate = plate; ! this.x = x; ! this.y = y; } String getPlate() { return this.plate; } void setPlate(String plate) { this.plate = plate; } int getX() { return this.x; } void setX(int x) { this.x = x; } int getY() { return this.y; } void setY(int y) { this.y = y; } } 44
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 1 2 45
Domain ‣ A Domain is one instance of the DDS Global Data Space ‣ DDS entities always belong to a specific domain Partition ‣ A partition is a scoping mechanism provided by DDS organize a partition OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DomainId = 0 VechicleTelemetry Domain and Partitions 46
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./cxx 47
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Joining Domain/Partition Note: ‣ Reference types are always created via factory methods on the parent entity ‣ Policies can be “streamed” into QoS objects // Create Domain Participant in the Domain “0” DomainId id = 0; DomainParticipant dp = TheParticipantFactory().create_participant(id); // Set the Publisher QoS with the proper partition pub::qos::PublisherQos pqos; pqos << policy::Partition("VehicleTelemetry"); // Create the Publisher pub::Publisher pub = dp.create_publisher(pqos); using namespace dds::core; using namespace dds; using namespace dds::domain; 48
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./java 49
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Joining Domain/Partition Note: ‣ The Boostrap class allows to run multiple DDS instances, even from different vendors on the same application // Create Domain Participant in the Domain “0” DomainId id = 0; DomainParticipantFactory factory = ! ! DomainParticipantFactory.getInstance (Bootstrap.createInstance()); DomainParticipant dp = factory.createParticipant(id); // Create the Publisher pub::Publisher pub = dp.create_publisher(pqos); import org.omg.dds.core.Bootstrap; import org.omg.dds.domain.DomainParticipant; import org.omg.dds.domain.DomainParticipantFactory; 50
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 3. Create Topic 1 2 3 51
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./cxx 52
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Topic Creation Note: ‣ QoS setting is optional and only required to override defaults ‣ QoS override shown to highlight how effective is the new QoS API // Create and set TopicQos (if different from // default) topic::qos::TopicQos tqos; tqos << policy::Reliability::Reliable() << policy::Durability::Transient() << policy::History::KeepLast(10) << policy::TransportPriority(14); // Create the Topic with specific Qos topic::Topic<VehiclePosition> topic = dp.create_topic<VehiclePosition>("VPosTopic", tqos); using namespace dds; // Create the Topic with default Qos topic::Topic<VehiclePosition> topic = dp.create_topic<VehiclePosition>("VPosTopic"); 53
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./java 54
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Topic Creation Note: ‣ The TopicType class is passed to work- around Java Generics type- erasure import org.omg.dds.topic.Topic; // Create the Topic with default Qos Topic<VehiclePosition> topic = dp.createTopic("VPosTopic", VehiclePosition.class); 55
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 3. Create Topic 4. Create DataWriter 1 2 3 4 56
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./cxx 57
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Writing Data Note: ‣ The DataWriter is parametrized on the Topic Type ‣ The stream operator can be used to write sample as well as override Qos, policies and to do coherent updates // Create and set DataWriterQos from TopicQos pub::qos::DataWriterQos dwqos(tqos); // Create DataWriter pub::DataWriter<VehiclePosition> dw = pub.create_datawriter(topic, dwqos); // Create Sample VehiclePosition vpos("A123", 100, 200); // Write dw.write(vpos); // Stream-like Write dw << vpos; // Stream-like Write + Policy override dw << policy::TransportPriority(55) << vpos; using namespace dds::core; using namespace dds; 58
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./java 59
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Writing Data Note: ‣ No need to pass the class type since it is maintained by the Topic import org.omg.dds.pub.DataWriter; // Create the Topic with default Qos DataWriter<VehiclePosition> dw = pub.createDataWriter(topic); // Create Sample VehiclePosition vp = new VehiclePosition("A123", 100, 200); // Write Sample dw.write(vp); 60
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS DDS App Steps 1. Define the Information Model 2. Connect to proper Domain/Partition 3. Create Topic 4. Create DataWriter 5. Create DataReader 1 2 3 4 4 61
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./cxx 62
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Reading Data Note: ‣ The read API is heavily based on iterators ‣ The stream operator can also be used read samples and a mutator is used to control the read/take behaviour ‣ Back-inserting iterators and zero-copy API also supported // (1) Create and set DataReaderQos from TopicQos sub::qos::DataReaderQos drqos(tqos); // (2) Create DataReader sub::DataReader<VehiclePosition> dr = sub.create_datareader(topic, drqos); // (3) Read with using Forward Iterators on std::vector std::vector<VehiclePosition> data(N); std::vector<SampleInfo> info(N); dr.read(data.begin(), info.begin(), N); // (3) Read with using Forward Iterators on arrays VehiclePosition adata[N]; SampleInfo ainfo[N]; dr.read(&adata[0], &ainfo[0], N); using namespace dds::core; using namespace dds; 63
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./java 64
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Reading Data Note: ‣ No need to pass the class type since it is maintained by the Topic import org.omg.dds.pub.DataReader; // Create the Topic with default Qos DataReader <VehiclePosition> dr = sub.createDataReader(topic); List<Sample<VehiclePosition>> data = new Vector<Sample<VehiclePosition>>(); dr.read(data); 65
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Putting all together int main(int, char**) { // -- Create Domain Participant DomainParticipant dp = ! ! TheParticipantFactory().create_participant(); // -- Create Publisher pub::Publisher pub = dp.create_publisher(); // -- Create Topic dds::topic::Topic<VehiclePosition> topic = ! ! dp.create_topic<VehiclePosition>("VSPosTopic"); // -- Create DataWriter pub::DataWriter<VehiclePosition> dw = ! ! ! pub.create_datawriter(topic); // -- Write Sample dw << VehiclePosition("A123", 100, 200); } ‣ Writing a DDS can take as 5 lines of code ‣ Default domain ‣ Default Qos 66
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./summ-up 67
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS Concluding Remarks ‣ DDS provide a powerful abstraction for building high available, scalable and high performance distributed systems ‣ The new C++ and Java API make DDS very simple to use while improving safety, performances and portability ‣ These new API are now finalized and planned for adoption during the December 2010 OMG meeting 68
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS ./references 69
OpenSpliceDDSOpenSpliceDDOpenSpliceDDSOpenSpliceDDSOpenSpliceDDS References ‣ Working incubator from which most of the ISO C++ PSM was derived ‣ Available at: ‣ http://code.google.com/p/simd-cxx The Simple DDS API SimD ‣ OMG submission for C++/Java PSM are also available as Open Source project at the following URL ‣ http://code.google.com/p/dds-psm-cxx/ ‣ http://code.google.com/p/datadistrib4j/ 70
http://www.opensplice.com/ http://www.opensplice.org/ emailto:opensplicedds@prismtech.com http://www.youtube.com/OpenSpliceTube http://opensplice.blogspot.com http://bit.ly/1Sreg http://www.slideshare.net/angelo.corsaro http://twitter.com/acorsaro/ D e l i v e r i n g P e r f o r m a n c e , O p e n n e s s , a n d F r e e d o m OpenSplice DDS References 71

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