DDS Integration

Nikolay Malitsky

Background

PV Data

Distributed Front-Ends

PCAS

Online Model

PCAS

Machine

CAC

PCAS

Virtual Accelerator

Client Applications

Middle LayerServers

Thin Application

CAC

CA V3

Thick Application

CAC

CA V3

CA V3 + PV Data

…

…

Primary Objective :

Basic Idea :

DDS Interface

http://sourceforge.net/projects/epics-dds

Benefits Brought by DDS to EPICS

The integration of these two technologies addresses five major tasks:

First, DDS brings an industrial standard interface to the accelerator online environment allowing to decouple a variety of high-level applications and toolkits from the underlying low-level control systems, such as EPICS, TINE, TANGO, and others.

Second, the DDS topic-oriented approach elevates the EPICS Channel Access protocol to the high-level applications replacing the additional RPC-like communication interfaces.

Third, DDS creates a basis of Service-Oriented Architecture (SOA) promoting decoupling of the service interfaces from their project-oriented implementations [Nanbor Wang, Tech-X Corp.]

Fourth, the DDS specification introduces some guidance for extending the EPICS infrastructure with the relevant set of quality of service.

Finally, the DDS technology extends the EPICS run-time environment with the relational model creating a platform for adding relational queries and integration of full-scale Data Stream Management Systems (DSMS) for data stream processing and archiving.

Major Milestones

June’ 08: Became aware of the OMG DDS after searching for “JMS C++”Sept’ 08: Checked it with OCI OpenDDS and PrismTech OpenSplicePVData meeting, BNL, Dec’ 08: Began the EPICS-DDS project implementingthe OMG DDS interface with the EPICS Channel Access protocol April’ 09: Replaced the DDS plain language binding with the PVData approachEPICS meeting, Spring’ 09: Introduced the EPICS-DDS project and conceptual ideas illustrated by a set of the dedicated examplesEPICS meeting, Fall’ 09: Built a prototype of a DDS-based high-level accelerator application environment including key middle layer servers, such as Machine, Online Model and Virtual Accelerator. Jan’ 10: Connected the EPICS-DDS middle layer with the Java client using the CAJ V3 and PVData of the EPICS-PVData projectFeb’ 10: Became an OMG Trial memberMarch – May’ 10: Commissioned the first EPICS-DDS application on the Cornell ERL injectorMay’ 10: Built the Model-Independent Analysis (MIA) composite application based on Online Model and Virtual Accelerator

Applications – 1 of 3

IOCIOC …

PCAS

Machine Server

CAC

NTMAT

load

PCAS

Turn-By-TurnServer

NTMAT

save

lattice file lattice file

Java Orbit Display

CAJ

CA

PVData

C. Gulliford, I. Bazarov, J. Dobbins, R. Talman (Cornell University), N. Malitsky (BNL)IPAC’10: THE NTMAT EPICS-DDS VIRTUAL ACCELERATOR FOR THE CORNELL ERL INJECTOR

PVData-based structures:• Machine Server Request• Turn-by-turn data

struct Position{ double x; double y;};struct TBTData { string name; vector<Position> tbt;};typedef vector<TBTData> TBTArray;

Applications – 2 of 3

PCAS

Machine Server

Java MIA Client

CAJCA

DDS Dynamic Data

PCAS

Twiss Server

PCAS

TBT Server

SVDMachine Publisher

CAC

PV Data

IPAC 10: APPLICATION OF MODEL INDEPENDENT ANALYSIS WITH EPICS-DDSN. Malitsky, I. Pinayev (BNL), R. Talman (Cornell U), C. Xiaomeng (Stony Brook University )

UALUALUAL

Applications – 3 of 3SBIR Grant: SERVICE-ORIENTED ARCHITECTURE FOR NEXT-GENERATION, LARGE-SCALE ACCELERATOR CONTROL SYSTEMSN. Wang (Tech-X Corp.)

Client

CACCA

PCAS

Optimization Server

MAD-X

PVData-based Optimization Request

PVData

Next : DDS Dynamic Topic Types

1. Data Distribution Service for Real-Time Systems, Version 1.2 formal 07-01-01, January 2007

2. Extensible Dynamic Topic Types for DDS RFP: June 27, 2008 Initial Submission: November 10, 2010 Revised Submission: February 22, 2010 Adopted Beta 1: May 21, 2010 Deadline for comments: November 29, 2010 FTF (Finalization Task Force) Recommendation and Report : April 4, 2011 Beta 2 (finalized specification): TBD

STAR Online Infrastructure Upgrade Proposal

Local Control Room (e.g. BNL) Remote Control Room

EPICS Run-Time Systems

AMQP Broker

AMQP Broker

PV Data Google Protocol Buffer

Archiver Monitoring

Stream Processing

DDS Dynamic Data DDS Dynamic Data