1. DDS Integration
Nikolay Malitsky

2. Background … … Basic Idea : DDS Interface Client Applications PV Data
Basic Idea :
Thin Application
Thick Application
DDS Interface
Client Applications …
PV Data
CAC
CAC
CA V3 + PV Data
PCAS
PCAS
PCAS
Primary Objective :
Middle Layer
Servers
Online Model
Machine
Virtual Accelerator
CAC
CA V3
CA V3
Distributed
Front-Ends …

3. 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.

4. Major Milestones
June’ 08: Became aware of the OMG DDS after searching for “JMS C++”
Sept’ 08: Checked it with OCI OpenDDS and PrismTech OpenSplice
PVData meeting, BNL, Dec’ 08: Began the EPICS-DDS project implementing
the OMG DDS interface with the EPICS Channel Access protocol
April’ 09: Replaced the DDS plain language binding with the PVData approach
EPICS meeting, Spring’ 09: Introduced the EPICS-DDS project and conceptual ideas illustrated by a set of the dedicated examples
EPICS 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 project
Feb’ 10: Became an OMG Trial member
March – May’ 10: Commissioned the first EPICS-DDS application on the Cornell ERL injector
May’ 10: Built the Model-Independent Analysis (MIA) composite application based on Online Model and Virtual Accelerator

5. Applications – 1 of 3 CA … PVData-based structures: PVData save load
IPAC’10: THE NTMAT EPICS-DDS VIRTUAL ACCELERATOR FOR THE CORNELL ERL INJECTOR
C. Gulliford, I. Bazarov, J. Dobbins, R. Talman (Cornell University), N. Malitsky (BNL)
Java
Orbit Display
PVData
CAJ CA
PVData-based structures:
Machine Server Request
Turn-by-turn data
PCAS
PCAS
NTMAT
Machine Server
Turn-By-Turn
Server
NTMAT
struct Position{
double x;
double y; };
struct TBTData {
string name;
vector<Position> tbt;
typedef vector<TBTData> TBTArray;
save
lattice file
CAC
lattice file
load …
IOC
IOC

6. Applications – 2 of 3 CA DDS Dynamic Data PV Data SVD
IPAC 10: APPLICATION OF MODEL INDEPENDENT
ANALYSIS WITH EPICS-DDS
N. Malitsky, I. Pinayev (BNL), R. Talman (Cornell U),
C. Xiaomeng (Stony Brook University )
DDS Dynamic Data
PV Data
SVD
Java
MIA Client
Machine Publisher
CAC
CAJ CA
PCAS
PCAS
PCAS
Machine Server
UAL
Twiss Server
UAL
TBT Server
UAL

7. Applications – 3 of 3 CA PVData-based Optimization Request PVData CAC
SBIR Grant: SERVICE-ORIENTED ARCHITECTURE FOR NEXT-GENERATION,
LARGE-SCALE ACCELERATOR CONTROL SYSTEMS
N. Wang (Tech-X Corp.)
PVData-based Optimization Request
PVData
Client
CAC CA
PCAS
Optimization
Server
MAD-X

8. Next : DDS Dynamic Topic Types
Data Distribution Service for Real-Time Systems, Version 1.2 formal , January 2007
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

9. STAR Online Infrastructure Upgrade Proposal
Archiver
Monitoring
DDS Dynamic Data
DDS Dynamic Data
AMQP Broker
Stream Processing
AMQP Broker
PV Data
Google Protocol Buffer
EPICS
Run-Time Systems
Local Control Room (e.g. BNL)
Remote Control Room