PLUG code generation tool

PLUG PLUG Presentation Layer Universal GeneratorPresentation Layer Universal Generator

P&D/SSD/TCE/TFP/AST- 28/09/98P&D/SSD/TCE/TFP/AST- 28/09/98

A joint company of Thomson-CSF Airsys and Siemens

P&D/SSD/TCE/TFP/AST - 04/10/232

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

AdjacentAir Traffic ControlCenter

AirportsAirports Flight Data Processing

Flight Data Processing

METEO DataMETEO DataRadar Data Processing

Radar Data Processing

transmetterReceiverHF/VHF

Flight PlanFlight Plan

Radar Data

Tracks

Primary

and secondary RADAR

ATC centre Architecture

Radar Data ProcessingRadar Data

Processing

Flight PlanProcessingFlight Plan

Processing

SupervisoryControlSupervisory

Control

SimulatorSimulator

RecordingReplayRecording

Replay

ControlerWorkingPosition

Voice control and

communicationsVoice control

and communications

Radar FrontProcessingRadar Front

Processing

Dual LANFDDI

AFTN/CIDINATFM

ADJACENTFIR'S/TWR'S

MET Centres

• Intercom• Priority• Public• RADIO A/G

ControlerWorkingPosition

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*

ASE* ASE ASE ASE

Object analogy

Implementation Interface

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

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

ProgrammingLanguage (C++)

ProgrammingLanguage (Ada)

Communication Object Design

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

API(SKELETON)

API(STUBS)

ServerClient

API PROTOCOL

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

Unix process

Library

Receive

Unix process

Client Server

Marshalling

Unmarshalling

Unix process

S = A+ B

A, B, +

API : Ada distributed Package

Ada Package specificationc

Ada PackageImplementation

OperationsOperations

DATAand

Operations Implementation

DATAand

EmptyImplementation

DATAand

Client side Server side

Heterogeneous Distributed System : Language or Hardware

Operations

DATAand

Operations

DATAand

Operations

DATAand

Operations

DATAand

Main API interface Operations

DATAand

Operations

DATAand

Operations

DATAand

Operations

DATAand

Ada ServerUnix Process

C ServerUnix Process

C++ ServerUnix Process

Ada or C or C++Client

Unix Process

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 :

End loop

Stop event processing

Stop API1, API2

Stop supervision API

Unregister

Underlying code is the stub automatically generatedby PLUG.

Itallic code is written by applicationprogrammer.

Supervised

Initialised

Running

Initialise / Start Services & Subscribe

Start / Process Events

Kill / Unregister

Unsupervised

/ Start supervision, Register & Subscribe

Unregistered

/ RegisterEvent/Action

Frozen

Unfreeze / Process Events

Stop / Stop services

Kill / Stop Services & Unregister

Freeze / Don't process Events

Client state diagram

Stub Generator Coder Generator

Ada API

PLUG : Presentation Layer Universal Generator

(CDR)(IDL,C++)

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 :

process AP1 events : .

API2 :

API3 :

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.

PLUG Coder generator

XDR/C generatedencoding source files

Front End(lex/yacc)

Back End

XDR/ADA generatedencoding source files

Ada Grammar

grammar analyzegrammar analyze

XDR Templatesexpansion

XDR Templates

AdaAPI

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

FIFOEnqueue Dequeue

Type AType BType Simple 1Type Simple 2

End Type BType CType Simple 1Type Simple 3Type D

Type Simple 3Type Simple 2

End Type DEnd Type C

End Type A

Type Ada Type C

Call Back encoding routing

XDR buffer

ToolsUser Tools User

Plug coder use : CDC encode/decode

End Type A

Type Ada Type CCall Back encoding routing

CDCCDC_write() CDC_read()

AdaCSCI

Ada Compiler C Compiler

XDR : How it works.

Coder : Structure Serialization

Struct Message Type 1

Field AField B

Field CField D

Field EField FField 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

C/XDRCoder

Struct Message Type 1 Field A

Field BField C

Field DField E

Field FField GField H

Field IEnd struct Message Type1

C structure

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

XDR StreamAda/XDRCoder(Ada)

Field BField C

Field DField E

Ada structure

InterfaceSpecification

Abstract Syntax

Transfert Syntax

Programming SyntaxProgramming Syntax

Object Message Passing Syntax

C/XDRCoder

Field BField C

Field DField E

C structure

XDR StreamAda/XDR

Field BField C

Field DField E

Ada structure

InterfaceSpecification

C/XDRCoder

Generator

Ada to CTranslator

Ada/XDRCoder

Generator

Ada PackageSpecification

(With)

Code generation output

C/XDRCoder

Field BField C

Field DField E

C structure

XDR StreamC/XDRCoder

Field BField C

Field DField E

C structure

C/XDRCoder

Field BField C

Field DField E

C structure

XDR StreamAda/XDR

Field BField C

Field DField E

Ada structure

Ada/XDRCoder

Field BField C

Field DField E

Ada structure

XDR StreamAda/XDR

Field BField C

Field DField E

Ada structure

Coder context

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

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

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

PLUG code generation tool

Technology

Transcript of PLUG code generation tool

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