PLUG is a presentation layer universal generator that provides automatic code generation from specifications. It uses object-oriented design and handles heterogeneous programming languages and hardware. PLUG can generate stubs for API usage and message coders for object message passing between distributed applications.

1. PLUGPLUG
Presentation Layer Universal GeneratorPresentation Layer Universal Generator
P&D/SSD/TCE/TFP/ASTP&D/SSD/TCE/TFP/AST-- 28/09/9828/09/98
A joint company of Thomson-CSF Airsys and Siemens

2. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20042
OVERVIEW
ATC requirements : Plug & Play (flexibility)
Object Oriented Design to automatic code generation
Compiler & Parser
PLUG (Presentation Layer Universal Generator) through
applications :
Stub generation : PATIO API
Coder generation : Object Message Passing
Future
* PATIO : Platform for ATM Tools Integration to Pre-operation

3. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20043
ATC processus
Adjacent
Air Traffic Control
Center
Adjacent
Air Traffic Control
Center
AirportsAirports Flight Data
Processing
Flight Data
Processing
METEO DataMETEO Data
Radar Data
Processing
Radar Data
Processing
transmetter
Receiver
HF/VHF
transmetter
Receiver
HF/VHF
Flight Plan
Radar
Data
Radar
Data
Tracks
Primary
and secondary RADAR
WAN
LAN
+
-

4. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20044
ATC centre Architecture
Radar Data
ProcessingRadar Data
Processing
Flight Plan
ProcessingFlight Plan
Processing
Supervisory
ControlSupervisory
Control
Simulator
Simulator
Recording
ReplayRecording
Replay
Controler
Working
Position
Controler
Working
Position
Voice control
and
communications
Voice control
and
communications
Radar Front
ProcessingRadar Front
Processing
Dual LAN
FDDI
AFTN/CIDIN
ATFM
ADJACENT
FIR'S/TWR'S
MET Centres
RADAR
• Intercom
• Priority
• Public
• RADIO A/G
Controler
Working
Position
Controler
Working
Position

5. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20045
PLUG : Presentation Layer Universal Generator
OSI layer 6 & 7 services
Manages heterogeneous programming
languages and hardware
Provides Plug & Play (flexibility)
=> Automatic code generation
=> Object Oriented Design
Application
Presentation
Session
ASN.1*
7
6
5
ASE* ASE ASE ASE

6. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20046
Object analogy
Implementation Interface
A driver doesn't care of
engine's internal working.
He only knows the interface

7. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20047
Specification Language
Network
Node A Node B
IRS (IDL)
Struct message1
Item1 : short;
Item2 : long;
Item3 : char;
Item4 : Boolean;
Item4 : Struct data
Item1 : :char;
Item2 : long;
Item3 : char;
Item4 : Boolean
Item4 : char;
end struct data;
end struct message1
Communication Language
Programming
Language (C++)
Programming
Language (Ada)
Communication Object Design

8. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20048
Syntax and Language
Abstract Syntax : specification language :
ASN.1, IDL, (ADA)
Working Syntax : programming language :
ADA, C, C++
Transfert (concrete) Syntax : communication
language :
BER/PER, XDR, CDR,
ASTERIX, ADEXP, ICAO

9. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/20049
Compiler VS Parser
Abstract Syntax is independent of Transfert
syntax :
Automatic code generation : Compilers
If no Abstract Syntax (AS = TS) :
Manual code generation : Parsers

10. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200410
PLUG Compilers
ABSTRACT SYNTAX
PLUG Ada RPC : API
PLUG ASN.1 : ATN
PLUG IDL : CORBA
Front End (FE)
TRANSFERT SYNTAX
PLUG XDR : API
PLUG BER/PER : ATN
PLUG CDR : CORBA, ESIOP
Back End (BE)

11. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200411
PLUG Parsers
PLUG ASTERIX :
Radar, Meteo, Categorie XX
PLUG ADEXP :
Flight Plan, ATS, AIS, CFMU, IFPS,
OLDI
PLUG ICAO :
Flight Plan, Meteo, Notam, ATS, OLDI
Tracks
Primary
and secondary RADAR

12. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200412
PLUG Compilers through applications
Distributed Object Design : API (IDL) PATIO
UBSS based Ada RPC
Stub generator
Message passing object design
XDR
Coder generator
Miscellanous
Symbolic trace and debug functions
Programming Language translator

13. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200413
PATIO API paradigm
Software components Plug & Play
Vertical services, Frame work, Design Patterns
Business Middleware = OSI layers 7,5,6 = ORB Core services
Business APIs = OSI layer 7 ASEs = CORBA objects
Business Middleware is also called API layer because it exhibits
only application APIs.
An API (as an ASE) is :
A protocol and
A logical interface (API = abstract syntax) : IRS
* IRS : Interface Requirements Specification.

14. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200414
API protocol
UBSS
API
(SKELETON)
APPLI
UBSS
API
(STUBS)
APPLI
ServerClient
API PROTOCOL
UNIX
LAN
UNIX
API

15. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200415
API : How it works
API protocol is equivalent to Sun RPC (Remote Procedure Call)
with asynchronous events
Servers Publish service interface and clients subscribe to services
Client invokes remote procedures executed by the server or
receives asynchronous event
Each server exports interfaces.
RPC encapsulates network access :
Send/Receive are hidden by Application functions call
RPC protocol manages parameters passing between client to
server.
XDR (External Data Representation) manages heterogeneous
programming language and hardware : Ada, C, C++.

16. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200416
RPC principle
Library
Main
Push
Pop
Unix process
Library
Main
Send
Receive
Unix process
Client Server
Marshalling
Unmarshalling
=>
XDR
XDR
Unix process
S = A+ B
A, B, +
S

17. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200417
API : Ada distributed Package
Ada Package
specificationc
Ada Package
Implementation
OperationsOperations
DATA
and
Operations
Implementation
DATA
and
Operations
Implementation
OperationsOperations
Empty
Implementation
Comms
Empty
Implementation
Comms
OperationsOperations
DATA
and
Operations
Implementation
DATA
and
Operations
Implementation
Client side Server side
=>

18. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200418
Heterogeneous Distributed System : Language or Hardware
Operations
DATA
and
Operations
Implementation
Operations
DATA
and
Operations
Implementation
Operations
DATA
and
Operations
Implementation
Operations
DATA
and
Operations
Implementation
Main API interface Operations
DATA
and
Operations
Implementation
Operations
DATA
and
Operations
Implementation
Operations
DATA
and
Operations
Implementation
Operations
DATA
and
Operations
Implementation
Ada Server
Unix Process
C Server
Unix Process
C++ Server
Unix Process
Ada or C or C++
Client
Unix Process

19. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200419
API Programming model : ClientRegister;
Start Supervision API
Register with supervisor; Subscribe to supervision events
Program Main Loop
Wait next event
Case API
Supervision :
peek event from supervision :
process supervision events : Initialise, start, stop, kill
API1 :
peek event from API 1 :
process AP1 events : ............
API2 :
peek event from API 2 :
process AP2 events : ............
End loop
Stop event processing
Stop API1, API2
Stop supervision API
Unregister
Underlying code is the stub
automatically generated
by PLUG.
Itallic code is written by application
programmer.

20. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200420
S u p e r v is e d
I n it ia lis e d
R u n n in g
I n it ia lis e / S t a r t S e r v ic e s & S u b s c r ib e
S t a r t / P r o c e s s E v e n t s
K ill / U n r e g is t e r
U n s u p e r v is e d
/ S t a r t s u p e r v is io n , R e g is t e r & S u b s c r ib e
U n r e g is t e r e d
/ R e g is t e r
E v e n t / A c t io n
F r o z e n
U n f r e e z e / P r o c e s s E v e n t s
S t o p / S t o p s e r v ic e s
K ill / S t o p S e r v ic e s & U n r e g is t e r
F r e e z e / D o n 't p r o c e s s E v e n t s
Client state diagram

21. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200421
XDR
Stub Generator Coder Generator
C Ada
Ada API
C Ada
PLUG : Presentation Layer Universal
Generator
(IDL)
(CDR)
(IDL,
C++)

22. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200422
PLUG
Stub Generator
Register; Start Supervion API
Register with supervisor; Subscribe to supervision events
Program Main Loop
Wait next event
Case API
Supervision :
peek event from supervision :
process supervision events : Initialise, start, stop, kill
API1 :
peek event from API 1 :
process AP1 events : .
API2 :
peek event from API 2 :
process AP2 events : ............
API3 :
peek event from API 2 :
process AP2 events : ............
End loop
Stop event processing
Stop API1, API2
Stop supervision API
Unregister
• Program skeltons are automatically
generated by PLUG.
• Stub generation is template driven.
• Templates are written with PLUG
Template Description Language (TDL).
Template
All Technical Middelware details are
hidden to the programmer :
Registry, Supervision, Subscription.

23. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200423
PLUG Coder generator
IFF
XDR/C generated
encoding source files
Front End
(lex/yacc)
Back End
XDR/ADA generated
encoding source files
Ada
Grammar
(BNF)
grammar analyzegrammar analyze
XDR Templates
expansion
XDR Templates
expansion
XDR
Templates
(TDL)
Ada
API
Independant
Format File
Independant
Format File
Abstract Syntax Tree

24. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200424
Object message passing with PLUG
UBSS manages pipes not the semantic of
transported messages
PLUG Coder are used to manage FIFO and CDC
messages.
Ada type specification is used as Specification
input file (AS)
IRS documents are replaced by Ada specification

25. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200425
Plug coder use : FIFO encode/decode
FIFO
Enqueue Dequeue
Type A
Type B
Type Simple 1
Type Simple 2
End Type B
Type C
Type Simple 1
Type Simple 3
Type D
Type Simple 3
Type Simple 2
End Type D
End Type C
End Type A
Type A
Type B
Type Simple 1
Type Simple 2
End Type B
Type C
Type Simple 1
Type Simple 3
Type D
Type Simple 3
Type Simple 2
End Type D
End Type C
End Type A
Type Ada Type C
Ada
XDR
XDR
C
Call Back encoding routing
XDR buffer
ToolsUser Tools User

26. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200426
Plug coder use : CDC encode/decode
Ada
XDR
XDR
C
Type A
Type B
Type Simple 1
Type Simple 2
End Type B
Type C
Type Simple 1
Type Simple 3
Type D
Type Simple 3
Type Simple 2
End Type D
End Type C
End Type A
Type A
Type B
Type Simple 1
Type Simple 2
End Type B
Type C
Type Simple 1
Type Simple 3
Type D
Type Simple 3
Type Simple 2
End Type D
End Type C
End Type A
Type Ada Type C
Call Back encoding routing
CDC
CDC_write() CDC_read()

27. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200427
Ada
CSCI
C
CSCI
XDR
Ada Compiler C Compiler
XDR : How it works.

28. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200428
Coder : Structure Serialization
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
End struct Message type1
Ada or C structure
XDR Stream
XDR Convertor
Elementary types are : Int, Char, float, Boolean Field 1Field 2Field 3Field 4Field 5 Header
Type 1
A B
C D
E
F G

29. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200429
C/XDR
Coder
(C)
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
C structure
Field 1Field 2Field 3Field 4Field 5Field 6Field 7Field 8Field 9
XDR StreamAda/XDR
Coder
(Ada)
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
Ada structure
Interface
Specification
Abstract Syntax
Transfert Syntax
Programming SyntaxProgramming Syntax
Object Message Passing Syntax

30. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200430
C/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
C structure
Field 1Field 2Field 3Field 4Field 5Field 6Field 7Field 8Field 9
XDR Stream
Ada/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
Ada structure
Interface
Specification
C/XDR
Coder
Generator
Ada to C
Translator
Ada/XDR
Coder
Generator
Ada Package
Specification
(With)
Code generation output

31. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200431
C/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
C structure
Field 1Field 2Field 3Field 4Field 5Field 6Field 7Field 8Field 9
XDR Stream
C/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
C structure
C/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
C structure
Field 1Field 2Field 3Field 4Field 5Field 6Field 7Field 8Field 9
XDR Stream
Ada/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
Ada structure
Ada/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
Ada structure
Field 1Field 2Field 3Field 4Field 5Field 6Field 7Field 8Field 9
XDR Stream
Ada/XDR
Coder
Struct Message Type 1
Field A
Field B
Field C
Field D
Field E
Field F
Field G
Field H
Field I
End struct Message
Type1
Ada structure
Coder context

32. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200432
Plug other possible applications
Symbolic trace and debug functions
Complex structure symbolic dump
Programming Language Translator
Ada to C, Ada to C++
Off line and recording files management
XDR standard file format

33. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200433
Sum Up
Object Oriented Design is mandatory to manage
heterogeneous programming language and
hardware to provide P&P.
Three kinds of services
UBSS based Object Middleware : API
Ada abstract syntax for Object Message Passing
Handcrafted Parser for ATC specific Transfer
Syntax

34. E.FUCHS
plug.ppt
P&D/SSD/TCE/TFP/AST - 3/28/200434
Future
IDL based ASTERIX compiler
States chart based code generation for Object
dymanic
ASE Skelton automatic generation
Business Object Skelton automatic generation
Ada/C++ translator