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CORBA tutorial Boston2003

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Emmanuel Fuchs
Emmanuel Fuchs

CORBA tutorial

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CORBA for transportation control and command systems tutorial
CORBA ATC use case, Note to offline reader. ! quot; # ! ! # quot; # $% # quot; quot;! ! & ' ( )quot; quot; # # quot; % quot; & ! ( # # ! & ! * )quot; quot; # quot; ! quot; # ! ! % !! ! ! quot; # ! ( % ! # quot; quot; ' # quot; ( ( quot; ' quot; quot; # # quot; quot; % ! # 31/03/03 Thales Air Traffic Management 2
The open issue : $ # + quot; quot; + , , 31/03/03 Thales Air Traffic Management 3
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 4
Why CORBA ? )quot; quot; # (quot; quot; ! ( ( # - quot; . / 0 ! )quot; quot; # (quot; quot; # ! ( ( # - quot; ( )quot; 31/03/03 Thales Air Traffic Management 5
Practical Use Case 0 # # ! + + # 1 quot; + quot; 2( ! %, 3! ! %, 0 ( , 2& 31/03/03 Thales Air Traffic Management 6
Complex system : ATC center AFTN/CIDIN ATFM ADJACENT FIR'S/TWR'S MET Centres Supervisory Recording Radar Front Radar Data Flight Plan Simulator Control Supervisory Replay Processing Processing Recording Processing Radar Front Radar Data Flight Plan Simulator Control Replay Processing Processing Processing LAN Voice control controller controller controller controller and Voice control Working Working Working Working communications and Position Position Position Position communications • Intercom • Priority • Public 4 56 31/03/03 • RADIO A/G Thales Air Traffic Management 7
Object At system level ? - quot; ! )quot; quot; # ( , ! (quot; quot; ! ! )quot; , ! 7 ( ! # '! )quot; #( ! ( 31/03/03 Thales Air Traffic Management 8
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 9
What Do We Want &+ + # quot; # quot; # 31/03/03 Thales Air Traffic Management 10
What Do We Want ! quot; # + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 11
What DO We Want ! quot; # quot; # # # + + + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 12
What DO We Want ! quot; # # # + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 13
We want to Increase Integrated software quality 31/03/03 Thales Air Traffic Management 14
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 15
What We expect ? 0 ! quot; # # # + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 16
What We expect ? 8 + # 31/03/03 Thales Air Traffic Management 17
What We May Have : + (quot; + (quot; + (quot; + (quot; + (quot; 2 31/03/03 Thales Air Traffic Management 18
Spaghetti Plate Syndrome 8 quot; 31/03/03 Thales Air Traffic Management 19
Spaghetti Plate Syndrome + quot; quot; + # 31/03/03 Thales Air Traffic Management 20
Spaghetti Plate Syndrome + # + # 31/03/03 Thales Air Traffic Management 21
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 22
Why CORBA 0 ! ( ( ! quot; # ! )quot; + ! )quot; quot; # 0 ) quot; 'quot; # ( ( quot; quot; 31/03/03 Thales Air Traffic Management 23
Software Component Integration Bus Software BUS 31/03/03 Thales Air Traffic Management 24
Object Software Component Integration Bus # $ # # ! Distributed )quot; 99:; ( Polymorphism quot; Software Components Evolution And Replacement 31/03/03 Thales Air Traffic Management 25
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 26
Polymorphism 1 < ' )quot; quot; # quot; * ( ! quot; 0 ! ! quot; = *GoF stand for Gang of Four. It refers to the pattern seminal book of John Vlissides, Erich Gamma, Richard Helm, Ralph Johnson: Design Patterns: Elements of Reusable Object-Oriented Software. 31/03/03 Thales Air Traffic Management 27
Object Software Component Integration Bus Object Software BUS 31/03/03 Thales Air Traffic Management 28
Object Software Component Integration Bus 8! Object Software BUS 31/03/03 Thales Air Traffic Management 29
Procedural versus Object Procedural Design Object Design After Object Before Object 31/03/03 Thales Air Traffic Management 30
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 31
Design for changes 0 quot; > ( ?quot; # @ 0 ( quot; # # A ( # ( 0 ( quot; quot; # 0 quot; > A - ( # # & # quot; # # ( quot; # 31/03/03 Thales Air Traffic Management 32
Changes Sources* During Development - quot;( 0 0 # 2 ( quot; # quot; quot; #0 +% 0 $ B 0 quot;( # + ; + quot; 8 <. ! / 31/03/03 Thales Air Traffic Management 33
Object Oriented Design # # !quot; quot;#& # quot; ! !quot; )quot; #. / quot; - . / quot; #quot; #quot; ! quot; ## & #quot; 0 quot; quot; quot; !quot; ! quot; # 0 quot; quot; quot; !quot; 31/03/03 Thales Air Traffic Management 34
Without OOD Without OOD Design for no Changes Stationary System 31/03/03 Thales Air Traffic Management 35
Change management before OOD #( quot; ( quot; # quot; Caller called 31/03/03 Thales Air Traffic Management 36
Change management before OOD 0 ! quot; quot; quot; ( quot; # quot; quot; # !quot; quot; No changes Caller called 31/03/03 Thales Air Traffic Management 37
Change management before OOD ! '! quot; quot; quot; # quot; quot; quot; # !quot; Changes 31/03/03 Caller called Thales Air Traffic Management 38
Change management and code reuse before OO ! '! quot; quot; quot; # quot; quot; quot; # !quot; Caller called 31/03/03 Thales Air Traffic Management 39
System Integration is a specific change case + # quot; quot; #quot; quot;# quot; !quot; 0 !quot; # -( !quot; quot; # quot; quot; quot; quot; Caller Called Caller Called 31/03/03 Thales Air Traffic Management 40
Integration case + # quot; quot; #quot; quot;# quot; !quot; 0 !quot; # -( !quot; quot; # quot; quot; quot; quot; Old New Old New Code Code Code Code Caller Called Called Caller 31/03/03 Thales Air Traffic Management 41
Pervasive Change Replaced Module (Changed) 31/03/03 Thales Air Traffic Management 42
Pervasive Change 31/03/03 Thales Air Traffic Management 43
Pervasive Change 31/03/03 Thales Air Traffic Management 44
Pervasive Change Several Changes Replace and Reused 31/03/03 Thales Air Traffic Management 45
Pervasive Change = Spaghetti Plate After Several Changes Replace and Reused + # 31/03/03 Thales Air Traffic Management 46
Procedural versus Object Without OOD With OOD Design for no Changes Design For Changes Stationary System Evolutionary System 31/03/03 Thales Air Traffic Management 47
Change management with OO reuse 0 % ! quot; quot; quot; !quot; quot; OOD Caller called 31/03/03 Thales Air Traffic Management 48
Change management with OO reuse 0 % ! quot; quot; quot; !quot; quot; No changes Caller called OOD 31/03/03 Thales Air Traffic Management 49
With OOD : Software Bus 31/03/03 Thales Air Traffic Management 50
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 51
Changes example : the printer Client Printing Server From The CORBA Bible Michi Henning Steve Vinoski Advanced CORBA Programming with C++ 31/03/03 Thales Air Traffic Management 52
Changes example : the printer 3 quot;quot; & # quot; # (quot; # #! quot;% ! #( ' ! quot; # ( ( ?- quot;% @ ! quot; #! quot; ! !quot; 31/03/03 Thales Air Traffic Management 53
Changes example : the printer Client Printing Server 31/03/03 Thales Air Traffic Management 54
Changes example : the printer Old Client Printing Server New Client 31/03/03 Thales Air Traffic Management 55
Change management with OOD reuse # #! quot;% ! Printing Server Client 31/03/03 Thales Air Traffic Management 56
Change management with OOD reuse 3 ! quot; # ( ( ?- quot;% @ ! quot; #! quot; ! !quot; Printing Server Client 31/03/03 Thales Air Traffic Management 57
Change management and code reuse before OOD quot; quot; # quot; ! ( quot;quot; # 31/03/03 Thales Air Traffic Management 58
Change management with OOD reuse # ? )quot;@ quot; ! quot; quot; # ( quot; 31/03/03 Thales Air Traffic Management 59
Object properties ? )quot;@ !# 2quot; quot; quot; 2 &quot; # quot; quot; quot; ! # quot; # 31/03/03 Thales Air Traffic Management 60
CORBA = Distributed Polymorphism )quot; # # quot; # 0 # )quot; + (quot; . +/ 31/03/03 Thales Air Traffic Management 61
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 62
CORBA Distributed Polymorphism examples 2& ! +8 # (quot; 2& C # +$ quot; quot; quot; .1 / 2& D # 31/03/03 Thales Air Traffic Management 63
Example UML Diagram Print Strip Printer 1 Strip : string Print() Print() From The CORBA Bible Michi Henning Steve Vinoski ColorPrinter Advanced CORBA Programming with C++ Setcolor() 31/03/03 Thales Air Traffic Management 64
Example Interface Inheritance (IDL) Printer # quot; ColorPrinter ! quot; 31/03/03 Thales Air Traffic Management 65
printer &OLHQW Printer print() Colour set_color() 31/03/03 Thales Air Traffic Management 66
printer &OLHQW Printer print() 31/03/03 Thales Air Traffic Management 67
CORBA Distributed Polymorphism example 1 8 # Printer + (quot; 0 - & 31/03/03 Thales Air Traffic Management 68
CORBA = Distributed Polymorphism ? # (quot; @ quot; quot; # (quot; # #quot; quot;quot; 8 #+ (quot; ( !quot; # ! quot; # (quot; 31/03/03 Thales Air Traffic Management 69
Objet Reference and Naming Client Naming Server Service Client lookup Server exports for Interface IOR IOR Client submits request to server 31/03/03 Thales Air Traffic Management 70
CORBA = Distributed Polymorphism % ! ( quot; quot; # quot; 8 !quot; quot; ! quot; ! quot; quot; 31/03/03 Thales Air Traffic Management 71
CORBA = Distributed Polymorphism +quot; ! quot; # Printer 8 # + (quot; ColorPrinter 0 - & quot;% 0 31/03/03 Thales Air Traffic Management 72
CORBA Distributed Polymorphism +quot; ! quot; # Printer 8 # + (quot; ColorPrinter 0 - & 31/03/03 Thales Air Traffic Management 73
printer &OLHQW Printer print() Colour set_color() 31/03/03 Thales Air Traffic Management 74
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 75
We need design patterns 0 ( # quot; quot; - # # quot; quot;! quot; quot; # ! quot; quot; ! % ! )quot; # # 31/03/03 Thales Air Traffic Management 76
Distributed Pattern # # .1 / )quot; + # )quot; + ! #! quot; ( quot; # quot; 2& quot; ! quot;quot; quot; )quot; ! + ! quot; & # ! +quot; & quot; # ! & 31/03/03 Thales Air Traffic Management 77
The GOF Abstract Factory Design Pattern *GoF stand for Gang of Four. It refers to the famous books of John Vlissides, Erich Gamma, Richard Helm, 31/03/03 Ralph Johnson. Design Patterns: Elements of Reusable Object-Oriented Software. Thales Air Traffic Management 78
Polymorphism and Factory Pattern : example 2 quot; 31/03/03 Thales Air Traffic Management 79
Life cycle Printer Factory Client Printer Create Printer Create Printer Printer IOR Request 31/03/03 Thales Air Traffic Management 80
FACTOY PATTERN (from OOC training) quot; quot; ! ( 'quot; # !# +quot; A client is required to provide security information before the factory object will allow the client to have access to another object. $ * quot;# The factory object manages a pool of objects, often representing some limited resource, and assigns them to clients based on some utilization algorithm. A factory object enables the use of polymorphism by returning object references to different implementations depending on 31/03/03 the criteria specified by a client. Thales Air Traffic Management 81
Polymorphism and Factory Pattern quot; 31/03/03 Thales Air Traffic Management 82
Polymorphism and Factory Pattern quot; 31/03/03 Thales Air Traffic Management 83
Factory And Code Generation &OLHQW Printer +print() Black & White + print() 31/03/03 Thales Air Traffic Management 84
Factory And Code Generation &OLHQW Printer +print() Black & White Colour + print() + print() 31/03/03 Thales Air Traffic Management 85
Factory And Code Generation &OLHQW Printer +print() Black & White Colour FAX + print() + print() + print() 31/03/03 Thales Air Traffic Management 86
Factory And Code Generation &OLHQW Printer +print() Strip Black & White Colour FAX + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 87
Factory And Code Generation <<Interface>> &OLHQW Printer +print() Strip Black & White Colour FAX + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 88
Factory And Code Generation <<Interface>> &OLHQW Printer Factory Strip Black & White Colour FAX Factory Factory Factory Factory 1 quot; 31/03/03 Thales Air Traffic Management 89
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 90
Why is procedural design expensive to change ? quot; quot; quot; # quot; quot; + ! quot; # quot; quot; # 31/03/03 Thales Air Traffic Management 91
Why is OOD easy to change ? quot; )quot; # quot; quot; 2quot; )quot; quot; # )quot; )quot; quot; quot; 31/03/03 Thales Air Traffic Management 92
Object collaboration 31/03/03 Thales Air Traffic Management 93
Why is OOD easy to change ? + ! quot; # ! )quot; quot; # ! quot; quot; )quot; quot; # quot; # quot;# ? @ 31/03/03 Thales Air Traffic Management 94
Example 3: The problem is in the User Input Exit Coordination State A: NIL_EXIT_STATE, B: FLIGHT_ACTIVATION_PROPOSAL, C: FLIGHT_ACTIVATION_ALARM, D: FLIGHT_ACTIVATION_CONFIRMED, E: HANDOVER_TRANSFERED, F: COORDINATION_TERMINATED, G: UNKNOWN_EXIT_STATE Enter Exit Coordination State => 31/03/03 Thales Air Traffic Management 95
Replace case and enum by object . enum ExitCoordinationState { NIL_EXIT_STATE, FLIGHT_ACTIVATION_PROPOSAL, FLIGHT_ACTIVATION_ALARM, FLIGHT_ACTIVATION_CONFIRMED, HANDOVER_TRANSFERED, COORDINATION_TERMINATED, UNKNOWN_EXIT_STATE } 31/03/03 Thales Air Traffic Management 96
Example of structural fragility : the switch + quot; +! quot; quot; # 2( quot; # quot; #quot; quot; # ! !quot; quot; quot; !quot; #% quot; # quot;E 2( ! ( quot; quot;quot; # ( ' ( !quot; quot;quot; # ( 0 ( quot; # ( quot; # ( ! !quot;quot; 31/03/03 Thales Air Traffic Management 97
structural switch static void printsStatus(int status) { switch(status) { case NIL_EXIT_STATE : processing 1 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_ALARM: processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 4 case HANDOVER_TRANSFERED, processing 5 case COORDINATION_TERMINATED, processing 6 case UNKNOWN_EXIT_STATE processing 7 } } 31/03/03 Thales Air Traffic Management 98
structural switch static void flightUpdate(int status) { switch(status) { case NIL_EXIT_STATE : processing 1 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_ALARM: processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 4 case HANDOVER_TRANSFERED, processing 5 case COORDINATION_TERMINATED, processing 6 case UNKNOWN_EXIT_STATE processing 7 } 31/03/03 } Thales Air Traffic Management 99
structural switch static void flightUpdate(int status) { switch(status) { case NIL_EXIT_STATE: processing 1 case FLIGHT_ACTIVATION_PROPOSAL: static void flightUpdate(int status) { processing 2 case FLIGHT_ACTIVATION_ALARM: static void flightUpdate(int status) { switch(status) { processing 3 case FLIGHT_ACTIVATION_CONFIRMED: case NIL_EXIT_STATE : switch(status) { processing4 processing 1 case HANDOVER_TRANSFERED, case NIL_EXIT_STATE : case FLIGHT_ACTIVATION_PROPOSAL: processing 5 processing 2 processing 1 case COORDINATION_TERMINATED, case FLIGHT_ACTIVATION_PROPOSAL: case FLIGHT_ACTIVATION_ALARM: processing 6 processing 2 processing 3 case UNKNOWN_EXIT_STATE case FLIGHT_ACTIVATION_ALARM: case FLIGHT_ACTIVATION_CONFIRMED: processing 7 processing 3 processing 4 } case FLIGHT_ACTIVATION_CONFIRMED: case HANDOVER_TRANSFERED, } processing 5 processing 4 case HANDOVER_TRANSFERED, case COORDINATION_TERMINATED, processing 5 processing 6 case COORDINATION_TERMINATED, case UNKNOWN_EXIT_STATE processing 6 processing 7 case UNKNOWN_EXIT_STATE } processing 7 } Software } } Module B Software Module A Software Module D Software Software static void flightUpdate(int status) { Module E Module C switch(status) { static void flightUpdate(int status) { case NIL_EXIT_STATE : processing 1 switch(status) { case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case NIL_EXIT_STATE : case FLIGHT_ACTIVATION_ALARM: processing 1 processing 3 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_CONFIRMED: case FLIGHT_ACTIVATION_ALARM: processing 4 processing 3 case HANDOVER_TRANSFERED, case FLIGHT_ACTIVATION_CONFIRMED: processing 5 processing 4 case COORDINATION_TERMINATED, case HANDOVER_TRANSFERED, processing 6 processing 5 case UNKNOWN_EXIT_STATE case COORDINATION_TERMINATED, processing 7 processing 6 } case UNKNOWN_EXIT_STATE } processing 7 31/03/03 } } Thales Air Traffic Management 100
The problem space and the solution space. !quot;( quot; & 0 - !quot; ( quot; # ( ! !quot;( 31/03/03 Thales Air Traffic Management 101
User Imput Exit Coordination State A: NIL_EXIT_STATE, B: FLIGHT_ACTIVATION_PROPOSAL, C: FLIGHT_ACTIVATION_ALARM, D: FLIGHT_ACTIVATION_CONFIRMED, E: HANDOVER_TRANSFERED, F: COORDINATION_TERMINATED, G: NewState H: UNKNOWN_EXIT_STATE Enter Exit Coordination State => 31/03/03 Thales Air Traffic Management 102
Replace case and enum by object . enum ExitCoordinationState { NIL_EXIT_STATE, FLIGHT_ACTIVATION_PROPOSAL, FLIGHT_ACTIVATION_ALARM, FLIGHT_ACTIVATION_CONFIRMED, HANDOVER_TRANSFERED, COORDINATION_TERMINATED, NewState, UNKNOWN_EXIT_STATE } 31/03/03 Thales Air Traffic Management 103
structural switch static void printsStatus(int status) { switch(status) { case NIL_EXIT_STATE : processing 1 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_ALARM: processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 4 case HANDOVER_TRANSFERED, processing 5 case COORDINATION_TERMINATED, processing 6 case New_State, processing 7 case UNKNOWN_EXIT_STATE processing 8 31/03/03 } } Thales Air Traffic Management 104
structural switch static void flightUpdate(int status) { switch(status) { case NIL_EXIT_STATE: processing 1 case FLIGHT_ACTIVATION_PROPOSAL: static void flightUpdate(int status) { processing 2 case FLIGHT_ACTIVATION_ALARM: switch(status) { processing 3 case FLIGHT_ACTIVATION_CONFIRMED: case NIL_EXIT_STATE : processing4 processing 1 case HANDOVER_TRANSFERED, case FLIGHT_ACTIVATION_PROPOSAL: processing 5 processing 2 static void flightUpdate(int status) { case COORDINATION_TERMINATED, case FLIGHT_ACTIVATION_ALARM: processing 6 processing 3 switch(status) { case UNKNOWN_EXIT_STATE case FLIGHT_ACTIVATION_CONFIRMED: processing 7 case NIL_EXIT_STATE : processing 4 } case HANDOVER_TRANSFERED, processing 1 } processing 5 case FLIGHT_ACTIVATION_PROPOSAL: case COORDINATION_TERMINATED, processing 2 processing 6 case FLIGHT_ACTIVATION_ALARM: case UNKNOWN_EXIT_STATE processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 7 processing 4 } case HANDOVER_TRANSFERED, } Software processing 5 case COORDINATION_TERMINATED, processing 6 case UNKNOWN_EXIT_STATE Module B processing 7 } Software } Module A Software Module D Software Software static void flightUpdate(int status) { Module E Module C switch(status) { static void flightUpdate(int status) { case NIL_EXIT_STATE : processing 1 switch(status) { case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case NIL_EXIT_STATE : case FLIGHT_ACTIVATION_ALARM: processing 1 processing 3 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_CONFIRMED: case FLIGHT_ACTIVATION_ALARM: processing 4 processing 3 case HANDOVER_TRANSFERED, case FLIGHT_ACTIVATION_CONFIRMED: processing 5 processing 4 case COORDINATION_TERMINATED, case HANDOVER_TRANSFERED, processing 6 processing 5 case UNKNOWN_EXIT_STATE case COORDINATION_TERMINATED, processing 7 processing 6 } case UNKNOWN_EXIT_STATE } Changes processing 7 31/03/03 } } Thales Air Traffic Management 105
OOD hides the problem space 0 % quot; # quot; quot; )quot; 3! 0 0 3! 31/03/03 Thales Air Traffic Management 106
Polymorphism Print() Status Client +print() UNKNOWN_EXI NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION T_STATE _STATE _PROPOSAL _ALARM + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 107
Factory Pattern &OLHQW Status +print() UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _ALARM _STATE _PROPOSAL + print() + print() + print() + print() StatusFactory 31/03/03 + create() Thales Air Traffic Management 108
Factory Pattern !quot; ! )quot; quot; quot; ! )quot; # ( quot; # !quot;quot; # quot; quot; ! quot; )quot; + 2quot; )quot; % ! ! #quot; (quot; quot; 31/03/03 Thales Air Traffic Management 109
Factory pseudo code static Status create(int status) { New Object switch(status) { case NIL_EXIT_STATE : return status = new nil_exit_state(); break; case FLIGHT_ACTIVATION_PROPOSAL: return status = new flight_activation_proposal(); break; case FLIGHT_ACTIVATION_ALARM: return status = new flight_activation_alarm(); break; case FLIGHT_ACTIVATION_CONFIRMED: return status = new flight_activation_confirmed(); break; case HANDOVER_TRANSFERED, return status = new handover_transfered(); break; case COORDINATION_TERMINATED, return status = new coordination_terminated(); break; case UNKNOWN_EXIT_STATE return status = new unknown_exit_state(); 31/03/03 } } Thales Air Traffic Management 110
Polymorphism and changes &OLHQW Status +print() No Changes UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _PROPOSAL _ALARM _STATE + print() + print() + print() + print() NEW_STATE 31/03/03 + print() Thales Air Traffic Management 111
Polymorphism and state patterns ! ( )quot; ! quot; quot; quot; # # ! ( quot;quot; # )quot; ! + ( !quot; ( )quot; quot; ## + quot; )quot; quot; quot; (quot; 31/03/03 Thales Air Traffic Management 112
State Pattern (from the GoF) 31/03/03 GoF stand for Gang of Four. It refers to the famous books of Vlisside and Co. Design Patterns: Elements of Reusable Object-Oriented Software. Thales Air Traffic Management 113
Object Programming Stat1 2& + F State2 State4 State5 G + # 31/03/03 Thales Air Traffic Management 114
State Pattern quot; & )quot; quot; !quot; )quot; )quot; & '# quot; % ! ! # ' ! quot; quot; (quot; 31/03/03 Thales Air Traffic Management 115
Polymorphism &OLHQW Status +print() UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _PROPOSAL _ALARM _STATE + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 116
Polymorphism Context &OLHQW Status status +print() +print() Concrete state UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _PROPOSAL _ALARM _STATE + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 117
Coarse Grain Examples & ( ' quot; quot; # quot; quot; quot; ' # ( )quot; # & quot; # & + ! )quot; quot; # )quot; 31/03/03 Thales Air Traffic Management 118
On line coordination with CORBA Objects Status Status Status Status 31/03/03 Air Traffic Control Centre Thales Air Traffic Management 119
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 120
CORBA = Coarse Grain Object Local Object Remote Object NO Operation1() Operation2() Fine Grain Object Operation3() Operation4() 31/03/03 Thales Air Traffic Management 121
CORBA = Coarse Grain Object Local Object Remote Object GroupOperation() YES 31/03/03 Thales Air Traffic Management 122
Distributed Object Patterns Façade Remote Object Local Object GetRemoteObject() H Operation1() $quot; quot; Operation2() Operation3() 31/03/03 Thales Air Traffic Management 123
Object By Value Event Factory Local Object Remote Object $quot; )quot; OBV new Event Type Operation1() Operation2() Operation3() 31/03/03 Thales Air Traffic Management 124
CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 125
Separation Of Concern Security Fault Load Transaction Tolerance Balancing Printer Printer Printer Printer 31/03/03 Thales Air Traffic Management 126
Separation Of Concern quot; quot; ! (# quot; quot; quot; quot; quot; )quot; )quot; quot; )quot; quot; )quot; quot; quot; ! quot; quot; )quot; quot; 31/03/03 Thales Air Traffic Management 127
Separation Of Concern Fault Load Security Transaction Tolerance Balancing Printer 31/03/03 Thales Air Traffic Management 128
Separation Of Concern Fault Load Transaction Security Tolerance Balancing Printer 31/03/03 Thales Air Traffic Management 129
Separation Of Concern Fault Security Printer Load Transaction Tolerance Balancing Technical Services Domain Services 31/03/03 Thales Air Traffic Management 130
Y development cycle quot; ! $ quot;# quot; quot; 1 quot; ! 31/03/03 Thales Air Traffic Management 131
Application Lay out quot; $ #quot; quot;- 31/03/03 Thales Air Traffic Management 132
Application Lay out quot; $quot; quot; # $ #quot; quot;- quot; quot; - 31/03/03 Thales Air Traffic Management 133
Application Lay out quot; quot; $ #quot; quot; quot; quot; quot; quot; quot; - quot; quot; 31/03/03 Thales Air Traffic Management 134
Y Standardization Process quot; quot; quot; # ! # quot; quot; ( # quot; ! quot; quot; quot; quot; quot; 0 ( ! quot;% ( A quot; 31/03/03 Thales Air Traffic Management 135
Y Standardization Process Domain Logic Domain Technical Patterns Patterns Transportation DTF 31/03/03 Thales Air Traffic Management 136

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CORBA tutorial Boston2003

  • 1. CORBA for transportation control and command systems tutorial
  • 2. CORBA ATC use case, Note to offline reader. ! quot; # ! ! # quot; # $% # quot; quot;! ! & ' ( )quot; quot; # # quot; % quot; & ! ( # # ! & ! * )quot; quot; # quot; ! quot; # ! ! % !! ! ! quot; # ! ( % ! # quot; quot; ' # quot; ( ( quot; ' quot; quot; # # quot; quot; % ! # 31/03/03 Thales Air Traffic Management 2
  • 3. The open issue : $ # + quot; quot; + , , 31/03/03 Thales Air Traffic Management 3
  • 4. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 4
  • 5. Why CORBA ? )quot; quot; # (quot; quot; ! ( ( # - quot; . / 0 ! )quot; quot; # (quot; quot; # ! ( ( # - quot; ( )quot; 31/03/03 Thales Air Traffic Management 5
  • 6. Practical Use Case 0 # # ! + + # 1 quot; + quot; 2( ! %, 3! ! %, 0 ( , 2& 31/03/03 Thales Air Traffic Management 6
  • 7. Complex system : ATC center AFTN/CIDIN ATFM ADJACENT FIR'S/TWR'S MET Centres Supervisory Recording Radar Front Radar Data Flight Plan Simulator Control Supervisory Replay Processing Processing Recording Processing Radar Front Radar Data Flight Plan Simulator Control Replay Processing Processing Processing LAN Voice control controller controller controller controller and Voice control Working Working Working Working communications and Position Position Position Position communications • Intercom • Priority • Public 4 56 31/03/03 • RADIO A/G Thales Air Traffic Management 7
  • 8. Object At system level ? - quot; ! )quot; quot; # ( , ! (quot; quot; ! ! )quot; , ! 7 ( ! # '! )quot; #( ! ( 31/03/03 Thales Air Traffic Management 8
  • 9. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 9
  • 10. What Do We Want &+ + # quot; # quot; # 31/03/03 Thales Air Traffic Management 10
  • 11. What Do We Want ! quot; # + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 11
  • 12. What DO We Want ! quot; # quot; # # # + + + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 12
  • 13. What DO We Want ! quot; # # # + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 13
  • 14. We want to Increase Integrated software quality 31/03/03 Thales Air Traffic Management 14
  • 15. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 15
  • 16. What We expect ? 0 ! quot; # # # + + Operator Display Supervision 31/03/03 System Thales Air Traffic Management 16
  • 17. What We expect ? 8 + # 31/03/03 Thales Air Traffic Management 17
  • 18. What We May Have : + (quot; + (quot; + (quot; + (quot; + (quot; 2 31/03/03 Thales Air Traffic Management 18
  • 19. Spaghetti Plate Syndrome 8 quot; 31/03/03 Thales Air Traffic Management 19
  • 20. Spaghetti Plate Syndrome + quot; quot; + # 31/03/03 Thales Air Traffic Management 20
  • 21. Spaghetti Plate Syndrome + # + # 31/03/03 Thales Air Traffic Management 21
  • 22. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 22
  • 23. Why CORBA 0 ! ( ( ! quot; # ! )quot; + ! )quot; quot; # 0 ) quot; 'quot; # ( ( quot; quot; 31/03/03 Thales Air Traffic Management 23
  • 24. Software Component Integration Bus Software BUS 31/03/03 Thales Air Traffic Management 24
  • 25. Object Software Component Integration Bus # $ # # ! Distributed )quot; 99:; ( Polymorphism quot; Software Components Evolution And Replacement 31/03/03 Thales Air Traffic Management 25
  • 26. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 26
  • 27. Polymorphism 1 < ' )quot; quot; # quot; * ( ! quot; 0 ! ! quot; = *GoF stand for Gang of Four. It refers to the pattern seminal book of John Vlissides, Erich Gamma, Richard Helm, Ralph Johnson: Design Patterns: Elements of Reusable Object-Oriented Software. 31/03/03 Thales Air Traffic Management 27
  • 28. Object Software Component Integration Bus Object Software BUS 31/03/03 Thales Air Traffic Management 28
  • 29. Object Software Component Integration Bus 8! Object Software BUS 31/03/03 Thales Air Traffic Management 29
  • 30. Procedural versus Object Procedural Design Object Design After Object Before Object 31/03/03 Thales Air Traffic Management 30
  • 31. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 31
  • 32. Design for changes 0 quot; > ( ?quot; # @ 0 ( quot; # # A ( # ( 0 ( quot; quot; # 0 quot; > A - ( # # & # quot; # # ( quot; # 31/03/03 Thales Air Traffic Management 32
  • 33. Changes Sources* During Development - quot;( 0 0 # 2 ( quot; # quot; quot; #0 +% 0 $ B 0 quot;( # + ; + quot; 8 <. ! / 31/03/03 Thales Air Traffic Management 33
  • 34. Object Oriented Design # # !quot; quot;#& # quot; ! !quot; )quot; #. / quot; - . / quot; #quot; #quot; ! quot; ## & #quot; 0 quot; quot; quot; !quot; ! quot; # 0 quot; quot; quot; !quot; 31/03/03 Thales Air Traffic Management 34
  • 35. Without OOD Without OOD Design for no Changes Stationary System 31/03/03 Thales Air Traffic Management 35
  • 36. Change management before OOD #( quot; ( quot; # quot; Caller called 31/03/03 Thales Air Traffic Management 36
  • 37. Change management before OOD 0 ! quot; quot; quot; ( quot; # quot; quot; # !quot; quot; No changes Caller called 31/03/03 Thales Air Traffic Management 37
  • 38. Change management before OOD ! '! quot; quot; quot; # quot; quot; quot; # !quot; Changes 31/03/03 Caller called Thales Air Traffic Management 38
  • 39. Change management and code reuse before OO ! '! quot; quot; quot; # quot; quot; quot; # !quot; Caller called 31/03/03 Thales Air Traffic Management 39
  • 40. System Integration is a specific change case + # quot; quot; #quot; quot;# quot; !quot; 0 !quot; # -( !quot; quot; # quot; quot; quot; quot; Caller Called Caller Called 31/03/03 Thales Air Traffic Management 40
  • 41. Integration case + # quot; quot; #quot; quot;# quot; !quot; 0 !quot; # -( !quot; quot; # quot; quot; quot; quot; Old New Old New Code Code Code Code Caller Called Called Caller 31/03/03 Thales Air Traffic Management 41
  • 42. Pervasive Change Replaced Module (Changed) 31/03/03 Thales Air Traffic Management 42
  • 43. Pervasive Change 31/03/03 Thales Air Traffic Management 43
  • 44. Pervasive Change 31/03/03 Thales Air Traffic Management 44
  • 45. Pervasive Change Several Changes Replace and Reused 31/03/03 Thales Air Traffic Management 45
  • 46. Pervasive Change = Spaghetti Plate After Several Changes Replace and Reused + # 31/03/03 Thales Air Traffic Management 46
  • 47. Procedural versus Object Without OOD With OOD Design for no Changes Design For Changes Stationary System Evolutionary System 31/03/03 Thales Air Traffic Management 47
  • 48. Change management with OO reuse 0 % ! quot; quot; quot; !quot; quot; OOD Caller called 31/03/03 Thales Air Traffic Management 48
  • 49. Change management with OO reuse 0 % ! quot; quot; quot; !quot; quot; No changes Caller called OOD 31/03/03 Thales Air Traffic Management 49
  • 50. With OOD : Software Bus 31/03/03 Thales Air Traffic Management 50
  • 51. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 51
  • 52. Changes example : the printer Client Printing Server From The CORBA Bible Michi Henning Steve Vinoski Advanced CORBA Programming with C++ 31/03/03 Thales Air Traffic Management 52
  • 53. Changes example : the printer 3 quot;quot; & # quot; # (quot; # #! quot;% ! #( ' ! quot; # ( ( ?- quot;% @ ! quot; #! quot; ! !quot; 31/03/03 Thales Air Traffic Management 53
  • 54. Changes example : the printer Client Printing Server 31/03/03 Thales Air Traffic Management 54
  • 55. Changes example : the printer Old Client Printing Server New Client 31/03/03 Thales Air Traffic Management 55
  • 56. Change management with OOD reuse # #! quot;% ! Printing Server Client 31/03/03 Thales Air Traffic Management 56
  • 57. Change management with OOD reuse 3 ! quot; # ( ( ?- quot;% @ ! quot; #! quot; ! !quot; Printing Server Client 31/03/03 Thales Air Traffic Management 57
  • 58. Change management and code reuse before OOD quot; quot; # quot; ! ( quot;quot; # 31/03/03 Thales Air Traffic Management 58
  • 59. Change management with OOD reuse # ? )quot;@ quot; ! quot; quot; # ( quot; 31/03/03 Thales Air Traffic Management 59
  • 60. Object properties ? )quot;@ !# 2quot; quot; quot; 2 &quot; # quot; quot; quot; ! # quot; # 31/03/03 Thales Air Traffic Management 60
  • 61. CORBA = Distributed Polymorphism )quot; # # quot; # 0 # )quot; + (quot; . +/ 31/03/03 Thales Air Traffic Management 61
  • 62. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 62
  • 63. CORBA Distributed Polymorphism examples 2& ! +8 # (quot; 2& C # +$ quot; quot; quot; .1 / 2& D # 31/03/03 Thales Air Traffic Management 63
  • 64. Example UML Diagram Print Strip Printer 1 Strip : string Print() Print() From The CORBA Bible Michi Henning Steve Vinoski ColorPrinter Advanced CORBA Programming with C++ Setcolor() 31/03/03 Thales Air Traffic Management 64
  • 65. Example Interface Inheritance (IDL) Printer # quot; ColorPrinter ! quot; 31/03/03 Thales Air Traffic Management 65
  • 66. printer &OLHQW Printer print() Colour set_color() 31/03/03 Thales Air Traffic Management 66
  • 67. printer &OLHQW Printer print() 31/03/03 Thales Air Traffic Management 67
  • 68. CORBA Distributed Polymorphism example 1 8 # Printer + (quot; 0 - & 31/03/03 Thales Air Traffic Management 68
  • 69. CORBA = Distributed Polymorphism ? # (quot; @ quot; quot; # (quot; # #quot; quot;quot; 8 #+ (quot; ( !quot; # ! quot; # (quot; 31/03/03 Thales Air Traffic Management 69
  • 70. Objet Reference and Naming Client Naming Server Service Client lookup Server exports for Interface IOR IOR Client submits request to server 31/03/03 Thales Air Traffic Management 70
  • 71. CORBA = Distributed Polymorphism % ! ( quot; quot; # quot; 8 !quot; quot; ! quot; ! quot; quot; 31/03/03 Thales Air Traffic Management 71
  • 72. CORBA = Distributed Polymorphism +quot; ! quot; # Printer 8 # + (quot; ColorPrinter 0 - & quot;% 0 31/03/03 Thales Air Traffic Management 72
  • 73. CORBA Distributed Polymorphism +quot; ! quot; # Printer 8 # + (quot; ColorPrinter 0 - & 31/03/03 Thales Air Traffic Management 73
  • 74. printer &OLHQW Printer print() Colour set_color() 31/03/03 Thales Air Traffic Management 74
  • 75. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 75
  • 76. We need design patterns 0 ( # quot; quot; - # # quot; quot;! quot; quot; # ! quot; quot; ! % ! )quot; # # 31/03/03 Thales Air Traffic Management 76
  • 77. Distributed Pattern # # .1 / )quot; + # )quot; + ! #! quot; ( quot; # quot; 2& quot; ! quot;quot; quot; )quot; ! + ! quot; & # ! +quot; & quot; # ! & 31/03/03 Thales Air Traffic Management 77
  • 78. The GOF Abstract Factory Design Pattern *GoF stand for Gang of Four. It refers to the famous books of John Vlissides, Erich Gamma, Richard Helm, 31/03/03 Ralph Johnson. Design Patterns: Elements of Reusable Object-Oriented Software. Thales Air Traffic Management 78
  • 79. Polymorphism and Factory Pattern : example 2 quot; 31/03/03 Thales Air Traffic Management 79
  • 80. Life cycle Printer Factory Client Printer Create Printer Create Printer Printer IOR Request 31/03/03 Thales Air Traffic Management 80
  • 81. FACTOY PATTERN (from OOC training) quot; quot; ! ( 'quot; # !# +quot; A client is required to provide security information before the factory object will allow the client to have access to another object. $ * quot;# The factory object manages a pool of objects, often representing some limited resource, and assigns them to clients based on some utilization algorithm. A factory object enables the use of polymorphism by returning object references to different implementations depending on 31/03/03 the criteria specified by a client. Thales Air Traffic Management 81
  • 82. Polymorphism and Factory Pattern quot; 31/03/03 Thales Air Traffic Management 82
  • 83. Polymorphism and Factory Pattern quot; 31/03/03 Thales Air Traffic Management 83
  • 84. Factory And Code Generation &OLHQW Printer +print() Black & White + print() 31/03/03 Thales Air Traffic Management 84
  • 85. Factory And Code Generation &OLHQW Printer +print() Black & White Colour + print() + print() 31/03/03 Thales Air Traffic Management 85
  • 86. Factory And Code Generation &OLHQW Printer +print() Black & White Colour FAX + print() + print() + print() 31/03/03 Thales Air Traffic Management 86
  • 87. Factory And Code Generation &OLHQW Printer +print() Strip Black & White Colour FAX + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 87
  • 88. Factory And Code Generation <<Interface>> &OLHQW Printer +print() Strip Black & White Colour FAX + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 88
  • 89. Factory And Code Generation <<Interface>> &OLHQW Printer Factory Strip Black & White Colour FAX Factory Factory Factory Factory 1 quot; 31/03/03 Thales Air Traffic Management 89
  • 90. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 90
  • 91. Why is procedural design expensive to change ? quot; quot; quot; # quot; quot; + ! quot; # quot; quot; # 31/03/03 Thales Air Traffic Management 91
  • 92. Why is OOD easy to change ? quot; )quot; # quot; quot; 2quot; )quot; quot; # )quot; )quot; quot; quot; 31/03/03 Thales Air Traffic Management 92
  • 93. Object collaboration 31/03/03 Thales Air Traffic Management 93
  • 94. Why is OOD easy to change ? + ! quot; # ! )quot; quot; # ! quot; quot; )quot; quot; # quot; # quot;# ? @ 31/03/03 Thales Air Traffic Management 94
  • 95. Example 3: The problem is in the User Input Exit Coordination State A: NIL_EXIT_STATE, B: FLIGHT_ACTIVATION_PROPOSAL, C: FLIGHT_ACTIVATION_ALARM, D: FLIGHT_ACTIVATION_CONFIRMED, E: HANDOVER_TRANSFERED, F: COORDINATION_TERMINATED, G: UNKNOWN_EXIT_STATE Enter Exit Coordination State => 31/03/03 Thales Air Traffic Management 95
  • 96. Replace case and enum by object . enum ExitCoordinationState { NIL_EXIT_STATE, FLIGHT_ACTIVATION_PROPOSAL, FLIGHT_ACTIVATION_ALARM, FLIGHT_ACTIVATION_CONFIRMED, HANDOVER_TRANSFERED, COORDINATION_TERMINATED, UNKNOWN_EXIT_STATE } 31/03/03 Thales Air Traffic Management 96
  • 97. Example of structural fragility : the switch + quot; +! quot; quot; # 2( quot; # quot; #quot; quot; # ! !quot; quot; quot; !quot; #% quot; # quot;E 2( ! ( quot; quot;quot; # ( ' ( !quot; quot;quot; # ( 0 ( quot; # ( quot; # ( ! !quot;quot; 31/03/03 Thales Air Traffic Management 97
  • 98. structural switch static void printsStatus(int status) { switch(status) { case NIL_EXIT_STATE : processing 1 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_ALARM: processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 4 case HANDOVER_TRANSFERED, processing 5 case COORDINATION_TERMINATED, processing 6 case UNKNOWN_EXIT_STATE processing 7 } } 31/03/03 Thales Air Traffic Management 98
  • 99. structural switch static void flightUpdate(int status) { switch(status) { case NIL_EXIT_STATE : processing 1 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_ALARM: processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 4 case HANDOVER_TRANSFERED, processing 5 case COORDINATION_TERMINATED, processing 6 case UNKNOWN_EXIT_STATE processing 7 } 31/03/03 } Thales Air Traffic Management 99
  • 100. structural switch static void flightUpdate(int status) { switch(status) { case NIL_EXIT_STATE: processing 1 case FLIGHT_ACTIVATION_PROPOSAL: static void flightUpdate(int status) { processing 2 case FLIGHT_ACTIVATION_ALARM: static void flightUpdate(int status) { switch(status) { processing 3 case FLIGHT_ACTIVATION_CONFIRMED: case NIL_EXIT_STATE : switch(status) { processing4 processing 1 case HANDOVER_TRANSFERED, case NIL_EXIT_STATE : case FLIGHT_ACTIVATION_PROPOSAL: processing 5 processing 2 processing 1 case COORDINATION_TERMINATED, case FLIGHT_ACTIVATION_PROPOSAL: case FLIGHT_ACTIVATION_ALARM: processing 6 processing 2 processing 3 case UNKNOWN_EXIT_STATE case FLIGHT_ACTIVATION_ALARM: case FLIGHT_ACTIVATION_CONFIRMED: processing 7 processing 3 processing 4 } case FLIGHT_ACTIVATION_CONFIRMED: case HANDOVER_TRANSFERED, } processing 5 processing 4 case HANDOVER_TRANSFERED, case COORDINATION_TERMINATED, processing 5 processing 6 case COORDINATION_TERMINATED, case UNKNOWN_EXIT_STATE processing 6 processing 7 case UNKNOWN_EXIT_STATE } processing 7 } Software } } Module B Software Module A Software Module D Software Software static void flightUpdate(int status) { Module E Module C switch(status) { static void flightUpdate(int status) { case NIL_EXIT_STATE : processing 1 switch(status) { case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case NIL_EXIT_STATE : case FLIGHT_ACTIVATION_ALARM: processing 1 processing 3 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_CONFIRMED: case FLIGHT_ACTIVATION_ALARM: processing 4 processing 3 case HANDOVER_TRANSFERED, case FLIGHT_ACTIVATION_CONFIRMED: processing 5 processing 4 case COORDINATION_TERMINATED, case HANDOVER_TRANSFERED, processing 6 processing 5 case UNKNOWN_EXIT_STATE case COORDINATION_TERMINATED, processing 7 processing 6 } case UNKNOWN_EXIT_STATE } processing 7 31/03/03 } } Thales Air Traffic Management 100
  • 101. The problem space and the solution space. !quot;( quot; & 0 - !quot; ( quot; # ( ! !quot;( 31/03/03 Thales Air Traffic Management 101
  • 102. User Imput Exit Coordination State A: NIL_EXIT_STATE, B: FLIGHT_ACTIVATION_PROPOSAL, C: FLIGHT_ACTIVATION_ALARM, D: FLIGHT_ACTIVATION_CONFIRMED, E: HANDOVER_TRANSFERED, F: COORDINATION_TERMINATED, G: NewState H: UNKNOWN_EXIT_STATE Enter Exit Coordination State => 31/03/03 Thales Air Traffic Management 102
  • 103. Replace case and enum by object . enum ExitCoordinationState { NIL_EXIT_STATE, FLIGHT_ACTIVATION_PROPOSAL, FLIGHT_ACTIVATION_ALARM, FLIGHT_ACTIVATION_CONFIRMED, HANDOVER_TRANSFERED, COORDINATION_TERMINATED, NewState, UNKNOWN_EXIT_STATE } 31/03/03 Thales Air Traffic Management 103
  • 104. structural switch static void printsStatus(int status) { switch(status) { case NIL_EXIT_STATE : processing 1 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_ALARM: processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 4 case HANDOVER_TRANSFERED, processing 5 case COORDINATION_TERMINATED, processing 6 case New_State, processing 7 case UNKNOWN_EXIT_STATE processing 8 31/03/03 } } Thales Air Traffic Management 104
  • 105. structural switch static void flightUpdate(int status) { switch(status) { case NIL_EXIT_STATE: processing 1 case FLIGHT_ACTIVATION_PROPOSAL: static void flightUpdate(int status) { processing 2 case FLIGHT_ACTIVATION_ALARM: switch(status) { processing 3 case FLIGHT_ACTIVATION_CONFIRMED: case NIL_EXIT_STATE : processing4 processing 1 case HANDOVER_TRANSFERED, case FLIGHT_ACTIVATION_PROPOSAL: processing 5 processing 2 static void flightUpdate(int status) { case COORDINATION_TERMINATED, case FLIGHT_ACTIVATION_ALARM: processing 6 processing 3 switch(status) { case UNKNOWN_EXIT_STATE case FLIGHT_ACTIVATION_CONFIRMED: processing 7 case NIL_EXIT_STATE : processing 4 } case HANDOVER_TRANSFERED, processing 1 } processing 5 case FLIGHT_ACTIVATION_PROPOSAL: case COORDINATION_TERMINATED, processing 2 processing 6 case FLIGHT_ACTIVATION_ALARM: case UNKNOWN_EXIT_STATE processing 3 case FLIGHT_ACTIVATION_CONFIRMED: processing 7 processing 4 } case HANDOVER_TRANSFERED, } Software processing 5 case COORDINATION_TERMINATED, processing 6 case UNKNOWN_EXIT_STATE Module B processing 7 } Software } Module A Software Module D Software Software static void flightUpdate(int status) { Module E Module C switch(status) { static void flightUpdate(int status) { case NIL_EXIT_STATE : processing 1 switch(status) { case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case NIL_EXIT_STATE : case FLIGHT_ACTIVATION_ALARM: processing 1 processing 3 case FLIGHT_ACTIVATION_PROPOSAL: processing 2 case FLIGHT_ACTIVATION_CONFIRMED: case FLIGHT_ACTIVATION_ALARM: processing 4 processing 3 case HANDOVER_TRANSFERED, case FLIGHT_ACTIVATION_CONFIRMED: processing 5 processing 4 case COORDINATION_TERMINATED, case HANDOVER_TRANSFERED, processing 6 processing 5 case UNKNOWN_EXIT_STATE case COORDINATION_TERMINATED, processing 7 processing 6 } case UNKNOWN_EXIT_STATE } Changes processing 7 31/03/03 } } Thales Air Traffic Management 105
  • 106. OOD hides the problem space 0 % quot; # quot; quot; )quot; 3! 0 0 3! 31/03/03 Thales Air Traffic Management 106
  • 107. Polymorphism Print() Status Client +print() UNKNOWN_EXI NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION T_STATE _STATE _PROPOSAL _ALARM + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 107
  • 108. Factory Pattern &OLHQW Status +print() UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _ALARM _STATE _PROPOSAL + print() + print() + print() + print() StatusFactory 31/03/03 + create() Thales Air Traffic Management 108
  • 109. Factory Pattern !quot; ! )quot; quot; quot; ! )quot; # ( quot; # !quot;quot; # quot; quot; ! quot; )quot; + 2quot; )quot; % ! ! #quot; (quot; quot; 31/03/03 Thales Air Traffic Management 109
  • 110. Factory pseudo code static Status create(int status) { New Object switch(status) { case NIL_EXIT_STATE : return status = new nil_exit_state(); break; case FLIGHT_ACTIVATION_PROPOSAL: return status = new flight_activation_proposal(); break; case FLIGHT_ACTIVATION_ALARM: return status = new flight_activation_alarm(); break; case FLIGHT_ACTIVATION_CONFIRMED: return status = new flight_activation_confirmed(); break; case HANDOVER_TRANSFERED, return status = new handover_transfered(); break; case COORDINATION_TERMINATED, return status = new coordination_terminated(); break; case UNKNOWN_EXIT_STATE return status = new unknown_exit_state(); 31/03/03 } } Thales Air Traffic Management 110
  • 111. Polymorphism and changes &OLHQW Status +print() No Changes UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _PROPOSAL _ALARM _STATE + print() + print() + print() + print() NEW_STATE 31/03/03 + print() Thales Air Traffic Management 111
  • 112. Polymorphism and state patterns ! ( )quot; ! quot; quot; quot; # # ! ( quot;quot; # )quot; ! + ( !quot; ( )quot; quot; ## + quot; )quot; quot; quot; (quot; 31/03/03 Thales Air Traffic Management 112
  • 113. State Pattern (from the GoF) 31/03/03 GoF stand for Gang of Four. It refers to the famous books of Vlisside and Co. Design Patterns: Elements of Reusable Object-Oriented Software. Thales Air Traffic Management 113
  • 114. Object Programming Stat1 2& + F State2 State4 State5 G + # 31/03/03 Thales Air Traffic Management 114
  • 115. State Pattern quot; & )quot; quot; !quot; )quot; )quot; & '# quot; % ! ! # ' ! quot; quot; (quot; 31/03/03 Thales Air Traffic Management 115
  • 116. Polymorphism &OLHQW Status +print() UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _PROPOSAL _ALARM _STATE + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 116
  • 117. Polymorphism Context &OLHQW Status status +print() +print() Concrete state UNKNOWN_EXIT NIL_EXIT FLIGHT_ACTIVATION FLIGHT_ACTIVATION _STATE _PROPOSAL _ALARM _STATE + print() + print() + print() + print() 31/03/03 Thales Air Traffic Management 117
  • 118. Coarse Grain Examples & ( ' quot; quot; # quot; quot; quot; ' # ( )quot; # & quot; # & + ! )quot; quot; # )quot; 31/03/03 Thales Air Traffic Management 118
  • 119. On line coordination with CORBA Objects Status Status Status Status 31/03/03 Air Traffic Control Centre Thales Air Traffic Management 119
  • 120. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 120
  • 121. CORBA = Coarse Grain Object Local Object Remote Object NO Operation1() Operation2() Fine Grain Object Operation3() Operation4() 31/03/03 Thales Air Traffic Management 121
  • 122. CORBA = Coarse Grain Object Local Object Remote Object GroupOperation() YES 31/03/03 Thales Air Traffic Management 122
  • 123. Distributed Object Patterns Façade Remote Object Local Object GetRemoteObject() H Operation1() $quot; quot; Operation2() Operation3() 31/03/03 Thales Air Traffic Management 123
  • 124. Object By Value Event Factory Local Object Remote Object $quot; )quot; OBV new Event Type Operation1() Operation2() Operation3() 31/03/03 Thales Air Traffic Management 124
  • 125. CORBA use case Can we use CORBA in Large Distributed Control System ? What do We want ! Complex System Seamless Integration Why CORBA ? Object Software Bus Design for changes Change example : Printer CORBA distributed polymorphism example CORBA and Distributed Design pattern example Procedural design versus Object design Designing Distributed Object 31/03/03 Normalisation processes Thales Air Traffic Management 125
  • 126. Separation Of Concern Security Fault Load Transaction Tolerance Balancing Printer Printer Printer Printer 31/03/03 Thales Air Traffic Management 126
  • 127. Separation Of Concern quot; quot; ! (# quot; quot; quot; quot; quot; )quot; )quot; quot; )quot; quot; )quot; quot; quot; ! quot; quot; )quot; quot; 31/03/03 Thales Air Traffic Management 127
  • 128. Separation Of Concern Fault Load Security Transaction Tolerance Balancing Printer 31/03/03 Thales Air Traffic Management 128
  • 129. Separation Of Concern Fault Load Transaction Security Tolerance Balancing Printer 31/03/03 Thales Air Traffic Management 129
  • 130. Separation Of Concern Fault Security Printer Load Transaction Tolerance Balancing Technical Services Domain Services 31/03/03 Thales Air Traffic Management 130
  • 131. Y development cycle quot; ! $ quot;# quot; quot; 1 quot; ! 31/03/03 Thales Air Traffic Management 131
  • 132. Application Lay out quot; $ #quot; quot;- 31/03/03 Thales Air Traffic Management 132
  • 133. Application Lay out quot; $quot; quot; # $ #quot; quot;- quot; quot; - 31/03/03 Thales Air Traffic Management 133
  • 134. Application Lay out quot; quot; $ #quot; quot; quot; quot; quot; quot; quot; - quot; quot; 31/03/03 Thales Air Traffic Management 134
  • 135. Y Standardization Process quot; quot; quot; # ! # quot; quot; ( # quot; ! quot; quot; quot; quot; quot; 0 ( ! quot;% ( A quot; 31/03/03 Thales Air Traffic Management 135
  • 136. Y Standardization Process Domain Logic Domain Technical Patterns Patterns Transportation DTF 31/03/03 Thales Air Traffic Management 136