DDS Connector Sept, Gianpiero Napoli, Senior Software Engineer

Transcription

1 DDS Connector Sept, 2016 Gianpiero Napoli, Senior Software Engineer

2 Agenda Goals Concept Architecture Status Demo Next Steps

3 Connector Goals Faster ( Rapid ) Development Integration Troubleshooting Integrate Connectivity technologies Scripting Simplify API, Configuration, Options Preserve Data-Oriented Design Architecture

4 The Connector Model What?

5 Connector Concept Component (a.k.a. App) Connection Connectivity Middleware Component (a.k.a. App) Connector connects components (apps) via some connectivity middleware

6 Connector Facilitates Integration Connection Connectivity Middleware Y Connection Connectivity Middleware X Component (a.k.a. App) Connection Connectivity Middleware X Connection Connectivity Middleware Y X = DDS Y = Web etc..

7 Connectors Speed Up Integration Connection X Connection Y

8 Connector connects your app to a data space (DDS) exposes a data-centric API lets your app read/write structured data

9 A Connector has Input & Output ports Connector Output Data Port Input Data Port Input Output

10 Connectors have a data-centric API Connector config Output Data Port output() write() / dispose() / unregister() clear_members() Input Data Port input() wait() / on() read() / take() samples[] infos[] instance

11 Connectors have a data-centric API Connector config Output Data Port output() write() / dispose() / unregister() clear_members() instance User Defined Structure Input Data Port input() wait() / on() read() / take() samples[]

12 DDS Connector Input & Output ports Connector (DomainParticipant+) config.xml Output Data Port (DataWriter+) output() write() / dispose() / unregister() clear_members() instance User Defined Structure Input Data Port (DataReader+) input() wait() / on() read() / take() samples[] XML Config

13 DDS Connector Other Connectivity Technology Service Config App Publisher Subscriber Connector API lua javascript python C java? C++? : DDS Connector Service Adapter Types QoS Endpoints RTI Connext DDS Service DOI (Stateful) DDS Topics API = Application Programming Interface DOI = Data-Oriented Interface

14 DDS Connector Other Connectivity Technology Service Config Connector API Service DOI writer() write()/dispose() (Stateful) App Publisher Subscriber reader() read()/take() wait() / on() DDS Connector Service Adapter Types QoS Endpoints RTI Connext DDS DDS Topics Custom Service API API = Application Programming Interface DOI = Data-Oriented Interface

15 DDS Connector Software Stack lua javascript node.js python DDS Connector C Prototyper + lua connector.js libffi connector.py connector.c (rti_dds_connector.so) RTI Connext DDS

16 Current Status Embedded within rtiddsprototyper binary included in the RTI Connext DDS product Experimental (research, early adopters) lua javascript node.js python DDS Connector C connector.lua connector.js libffi connector.py connector.c (rti_dds_connector.so) RTI Connext DDS

17 DDS Connector Configuration XML Based App Creation Participant Output Port Types QoS Endpoints Data Input Port Type Type Data Objects QoS Type Data Writer Name Output QoS Topic Name QoS Input Data Reader Name

18 Using a Connector: Pseudo Code Creating a Connector connector = new Connector( participant_name, config.xml ) Reading Data Writing Data input = connector.getinput( in_name ) output = connector.getoutput( out_name ) input.take() length = input.samples.getlength(input) for (i = 1; i <= length; ++i) { if connector.infos(i).isvalid then { print(connector.samples(i)) } } output.instance.setnumber( x, 10.0) output.write()

19 Integrating DDS & Web Technologies Connection Connectivity Middleware RESTful: HTTP, Websockets,HTML5 nodejs Connection Connectivity Middleware DDS JavaScript Component (node.js App) Connection Connectivity Middleware DDS nodejs Connection Connectivity Middleware RESTful: HTTP, WebSockets, HTML5

20 Demo

21 Common Use Cases Integration I/O UIs Middleware technologies DDS Domain Bridging Device / Hardware Web APIs and Services GUI Toolkits Web Based Information Processing... Use various processors, eg Rx? Integrate with CEP engines?

22 Use Case: Integrating DDS and Web Standard Thin Client (without DDS) Real-Time Web push using websockets (using socket.io) Browser, Mobile, Handheld no special software installation Custom Thin Client (with DDS) HTML5 GUI using nw.js +Plus the capabilities of Real-Time Web +Plus the capabilities of DDS (state management)

23 Connector is Experimental Product Download connector here: s-connector More info on connector here: mental/rticonnextdds-connector

24 Thank You!

25 Examples and code digging! simple DDS DDS poll event web_http DDS HTTP poll web_socket Getting Started DDS WebSockets HTML5: table, chart, plugin (Google Earth)

26 Data Indexing Prototyper with Lua Getting Started Guide Section 6.4 NOTE Prototyper = Singleton Connector + Execution Loop

27 DDS Connector API Connector Output Data Port Input Data Port

28 DDS Connector API

29 DDS Connector for Lua - connector.lua lua connector

30 DDS Connector for C - connector.c C connector

31 DDS Connector for Python - connector.py python connector