PLUG code generation tool

PLUG Presentation Layer Universal Generator P&D/SSD/TCE/TFP/AST- 28/09/98 A joint company of Thomson-CSF Airsys and Siemens

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

ATC processus Adjacent Air Traffic Control Cente r Airports Flight Data Processing METEO Data Radar Data Processing Flight Plan Radar Data Tracks Primary and secondary RADAR WAN LAN + - transmetter Receiver HF/VHF

ATC centre Architecture Radar Data Processing Flight Plan Processing Supervisory Control Simulator Recording Replay Controler Working Position Voice control and communications Radar 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 Controler Working Position

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

Object analogy Implementation Interface A driver doesn't care of engine's internal working. He only knows the interface

Communication Object Design 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)

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

Compiler VS Parser

Abstract Syntax is independent of Transfert syntax :

Automatic code generation : Compilers

If no Abstract Syntax (AS = TS) :

Manual code generation : Parsers

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)

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

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

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.

API protocol UBSS API (SKELETON) APPLI UBSS API (STUBS) APPLI Server Client API PROTOCOL UNIX LAN UNIX API

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++.

RPC principle Library Main Send Receive Unix process Client Server Marshalling Unmarshalling => XDR XDR Unix process S = A+ B A, B, + S Library Main Push Pop Unix process

API : Ada distributed Package Ada Package specificationc Ada Package Implementation Operations DATA and Operations Implementation Operations Empty Implementation Comms Operations DATA and Operations Implementation Client side Server side =>

Heterogeneous Distributed System : Language or Hardware Main API interface Ada Server Unix Process C Server Unix Process C++ Server Unix Process Ada or C or C++ Client Unix Process Operations DATA and Operations Implementation Operations DATA and Operations Implementation Operations DATA and Operations Implementation Operations DATA and Operations Implementation Operations DATA and Operations Implementation Operations DATA and Operations Implementation Operations DATA and Operations Implementation Operations DATA and Operations Implementation

API Programming model : Client

Register;

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.

Client state diagram

PLUG : Presentation Layer Universal Generator XDR Stub Generator Coder Generator C Ada Ada API C Ada (IDL) (CDR) (IDL, C++)

PLUG Stub Generator

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. 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

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 analyze XDR Templates expansion XDR Templates (TDL) Ada API Independant Format File Abstract Syntax Tree

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

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 Call Back encoding routing XDR buffer Tools User Ada XDR XDR C Tools User

Plug coder use : CDC encode/decode 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_write() CDC_read() Ada XDR XDR C CDC

Ada CSCI C CSCI XDR Ada Compiler C Compiler XDR : How it works.

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 1 Field 2 Field 3 Field 4 Field 5 Header Type 1 A B C D E F G

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 XDR Stream Ada/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 Syntax Programming Syntax Object Message Passing Syntax Field 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7 Field 8 Field 9

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 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 Field 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7 Field 8 Field 9

Coder context 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 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7 Field 8 Field 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 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7 Field 8 Field 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 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7 Field 8 Field 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

Plug other possible applications