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Temporal Examples in Rapide

Temporal Examples in Rapide. Mohammad Al Said Miheer Bhachech Aditya Garg . Rapide Syntax. Architecture

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Temporal Examples in Rapide

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  1. Temporal Examples in Rapide • Mohammad Al Said • Miheer Bhachech • Aditya Garg CS599 Formal Methods in Software Architectures

  2. Rapide Syntax • Architecture • architecture_declaration ::= architecture identifier `(' [ parameter_list ] `)'       [ return interface_expression ] is      [ module_constituent_list ]       [ connect { connection } ] end [ architecture ] [ identifier ] `;' • connection ::=     pattern connector pattern `;'   | other kinds of pattern connections ... • connector ::= `to' | `=>' | `||>' CS599 Formal Methods in Software Architectures

  3. Interface • The interface type of a component consists of the set of constituents by which the component communicates with other components. • Interface types are declared using the following syntax: • type_declaration ::=   type identifier is interface_expression `;' • interface_type_expression ::= interface { interface_constituent }     [ behavior behavior_declaration ] end [ interface ] [ identifier ] • interface_constituent ::= provides { interface_declarative_item }   | requires { interface_declarative_item }   | action { action_name_declaration }   | private { interface_declarative_item }   | service { service_declarative_item }   | constraint { pattern_constraint_list} CS599 Formal Methods in Software Architectures

  4. Actions and Functions • action_name_declaration ::=  action mode identifier     `(' [ formal_parameter_list ] `)' `;' • mode ::= in | out • function_name_declaration ::= function identifier     `(' [ formal_parameter_list ] `)'     [ return type_expression ] `;' • For example, • action in Write(value : Data); function Read() return Data; CS599 Formal Methods in Software Architectures

  5. Tool Support • There are several tools to assist programmers who want to develop Rapide models of systems. The tools include: • an architecture-based editor for defining system models, • a compiler for producing executables from the system models, • a constraint checking runtime system that is used by an executable to produce a history of the execution, • a graphical browser for viewing histories, and • an animation facility providing another view of histories. • The Rapide Toolset is available for Solaris 2.5, SunOS 4.1.3. and Linux. CS599 Formal Methods in Software Architectures

  6. CS599 Formal Methods in Software Architectures

  7. Gas_Station • Assumptions: • Operator schedules pumps to customers. • No mechanism that map customers to the right pump. • Main Gas tank refilling process is not included. • Main Gas Tank is divided into 3 tanks based on Fuel grade. • Car’ Gas tank is not included. CS599 Formal Methods in Software Architectures

  8. Customer type Dollars is Real; type Gallons is Real; type Fuel is Integer; type Customer is interface action out Pre_Pay(Cost : Dollars), Turn_On(), Walk(), Turn_Off(), Select_Grade(Fuel_Grade : Fuel); in Okay(), Change(Cost : Dollars); behavior D : Dollars; FG : Fuel; begin start => Pre_Pay(D);; Okay => Walk;; Okay => Select_Grade(FG); Turn_On();;   end Customer; CS599 Formal Methods in Software Architectures

  9. Operator type Operator is interface action in Request(Cost : Dollars), Refill_Tank(FL : Boolean; Tank : Fuel), Result(Cost : Dollars); out Schedule(Cost : Dollars), behavior Payment : Dollars; Fuel_Level_Low : var Boolean :=False; Tank_Number: Fuel; Action Add_Fuel_To_Tank(Tank : Fuel); Begin (?X : Boolean ; ?Y : Fuel) (Refill_Tank(?X ; ?Y) => Fuel_Level_Low :=?X; Tank_Number :=?Y;; Fuel_Level_Low => Add_Fuel_To_Tank($Tank_Number);; (?X : Dollars)Request(?X) => Payment := ?X; Schedule(?X);; (?X : Dollars)Result(?X) => Remit($Payment - ?X);; end Operator; CS599 Formal Methods in Software Architectures

  10. Pump type Pump is interface action in On(), Off(), Activate(Cost : Dollars), Select_Fuel_Grade(Fuel_Grade : Fuel), Ok(); out Report(Amount : Gallons; Cost : Dollars), Request_Gas_From_Tank(GT : Fuel); behavior Free : var Boolean := True; Premium_Cost : var Real := 1.9; Plus_Cost : var Real := 1.8; Regular_Cost : var Real :=1.7; Reading, Limit : var Dollars := 0; Gallons_Dispensed : var Gallons :=0; action In_Use(), Done(), Fuel_Grade_Selected(); begin (?X : Dollars)(On ~ Activate(?X) AND Ok) where $Free => Free := False; Limit := ?X; Fuel_Grade_Selected;; Fuel_Grade_Selected => In_Use;; In_Use => if (((?Y : Fuel) Select_Fuel_Grade(?Y) == 1 ) then Reading := $Premium_Cost * $Gallons_Dispensed ) elsif (((?Y : Fuel) Select_Fuel_Grade(?Y) == 2) then Reading := $Plus_Cost * $Gallons_Dispensed ) else Reading := $Regular_Cost * $Gallons_Dispensed endif; Done;; Off or Done => Free := True; Report($Reading);; end Pump; CS599 Formal Methods in Software Architectures

  11. Fuel_Tank type Fuel_Tank is interface action in Requested_Gas_Type(Fuel_Grade : Fuel); out Ok(), Request_To_Refill_Tank(FL : Boolean ; Tank : Integer); behavior Fuel_Level : var Boolean :=True; Available_Gas , Threshold : Gallons; action Select_Tank_Type(Fuel_Grade : Fuel) , Send_To_Pump(); begin (?FG : Fuel) Request_Gas_Type(?FG) => Select_Tank_Type(?FG);; (Available_Gas <= Threshold ) => Fuel_Level_Ok :=False; Request_To_Refill_Tank($Fuel_Level, ?FG);; Send_To_Pump => Ok;; end Fuel_Tank; CS599 Formal Methods in Software Architectures

  12. architecture gas_station() return root is O : Operator; P1, P2, P3, P4 : Pump; C1, C2, C3, C4 : Customer; T : Tank; connect (?C : Customer; ?X : Dollars) ?C.Pre_Pay(?X) => O.Request(?X); (?X : Dollars; ?P : Pump) O.Schedule(?X) => ?P.Activate(?X); (?X : Dollars) O.Schedule(?X) => ?C.Okay; (?C : Customer; ?P : Pump; ?F : Fuel) ?C.Select_Grade(?F) => ?P.Select_Fuel_Grade(?F); (?P : Pump; T : Tank; ?F : Fuel) ?P.Request_Gas_From_Tank(?F) => T.Requested_Gas_Type(?F); (?F : Fuel ; FL : Boolean) T.Request_To_Refill_Tank(?FL , ?F) => O.Refill_Tank(?FL , ?F); (?P : Pump) T.Ok => ?P.Ok (?C : Customer; ?P : Pump) ?C.Turn_On => ?P.On; (?C : Customer; ?P : Pump) ?C.Turn_Off => ?P.Off; (?X : Gallons; ?Y : Dollars; ?P : Pump) ?P.Report(?X, ?Y) => O.Result(?Y); end gas_station; CS599 Formal Methods in Software Architectures

  13. Cruise Control System • Assumptions made about the system: • The system consists of five interfaces • Driver • Accelerator • Brakes • SpeedMeter • Cruise • The engine is always on in the system. • The Cruise can sense a change in the car speed. • Whenever the accelerator is pressed, SpeedMeter increases the speed and has the current speed of the car. SpeedMeter can increase & decrease the speed of the car. • While going uphill or downhill, the Cruise will try to maintain the CRUISE_SPEED by sending an action to the SpeedMeter. CS599 Formal Methods in Software Architectures

  14. System Block Diagram Brakes Accelerator Driver inoutoutin out out out out in in in in out in in out SpeedMeter Cruise CS599 Formal Methods in Software Architectures

  15. Driver Interface type BOOL is boolean; type INT is integer; type Driver is interface action out Press_Accelerator(), Press_Cruise_On(), Press_Cruise_Set(), Press_Brakes(), Press_Cruise_Resume(), Release_Accelerator(), Press_Cruise_Accelerate(), Press_Cruise_Decelerate(), Press_Cruise_Off(); end Driver; CS599 Formal Methods in Software Architectures

  16. Brakes Interface type Brakes is interface action in Pressed(); out Cruise_Disable(); behavior begin Pressed() => Cruise_Disable();; end Brakes; CS599 Formal Methods in Software Architectures

  17. Accelerator Interface type Accelerator is interface action in Pressed(), Released(); out Cruise_Again(), IncreaseSpeed(Speed : INT); behavior Speed : INT; begin Pressed() => IncreaseSpeed(?Speed);; Released() => Cruise_Again();; End Accelerator; CS599 Formal Methods in Software Architectures

  18. SpeedMeter Interface(1) type SpeedMeter is interface action in IncreaseSpeed(Speed : INT), Cruise_Acc(), Cruise_Dec(), UpHill(Speed : INT), DownHill(Speed : INT); out Speed_Check(Speed : INT); Cruise_accl_dcl(Speed : INT); behavior currentSpeed : var INT; CS599 Formal Methods in Software Architectures

  19. SpeedMeter Interface(2) begin (?X:INT) IncreaseSpeed(?X) => currentSpeed := ?X; Speed_Check($currentSpeed);; Cruise_Acc() => Cruise_accl_dcl($currentSpeed);; Cruise_Dec() => Cruise_accl_dcl($currentSpeed);; (?X : INT) UpHill(?X) => currentSpeed := ?X;; (?X : INT) DownHill(?X) => currentSpeed := ?X;; End SpeedMeter; CS599 Formal Methods in Software Architectures

  20. Cruise Interface (1) type Cruise is interface action in Speed_Check(SPEED : INT); Cruise_On(); Cruise_Off(); Cruise_Set(); Cruise_Disabled(); Cruise_Resume(); Cruise_Again(); Cruise_AccelDecel(); out Change_In_Speed(Speed : INT); CS599 Formal Methods in Software Architectures

  21. Cruise Interface (2) behavior CurSpeed : var INT ; PREVIOUS_SPEED : var INT ; IN_CRUISE :var BOOL := False; CRUISE_ENABLED :var BOOL := False; CRUISE_ON : var BOOL := False; CRUISE_SPEED : var INT ; CRUISE_SET : var BOOL := False; ALLOWABLE : var BOOL := False; ACCEL_RELEASED : var BOOL := False; BRAKE_PRESSED : var BOOL := False; ACCEL_PRESSED : var BOOL := False; action Cruise_Status(); CS599 Formal Methods in Software Architectures

  22. Cruise Interface (3) begin Cruise_Off() => CRUISE_ON := False; CRUISE_ENABLED := False; (?Y : INT) Speed_Check(?Y) where ?Y>30 and ?Y<90 and $CRUISE_ON => CurSpeed := ?Y; ALLOWABLE := True; ACCEL_PRESSED := True; Cruise_Status();; Cruise_Status() where $CRUISE_ENABLED := True => CRUISE_ENABLED := False; ACCEL_PRESSED := False; BRAKE_PRESSED := False; IN_CRUISE := True;; CS599 Formal Methods in Software Architectures

  23. Cruise Interface (4) Cruise_Again() where $IN_CRUISE := True => CRUISE_ENABLED := True; CRUISE_SPEED := PREVIOUS_SPEED; IN_CRUISE := False;; Cruise_On() => CRUISE_ON := True;; Cruise_Set() where $ALLOWABLE and $CRUISE_ON => CRUISE_SPEED :=$CurSpeed; PREVIOUS_SPEED := $CRUISE_SPEED; CRUISE_ENABLED := True; ALLOWABLE := False;; CS599 Formal Methods in Software Architectures

  24. Cruise Interface (5) Cruise_Disabled() where $CRUISE_ENABLED := True => CRUISE_ENABLED := False; BRAKE_PRESSED := True;; Cruise_Resume() where $CRUISE_ENABLED := False and $BRAKE_PRESSED and $CurSpeed > 30 => CRUISE_ENABLED := True; CRUISE_SPEED := $PREVIOUS_SPEED; BRAKE_PRESSED := False;; (?X : INT) Cruise_AccelDecel(?X) where ?X>30 and ?X<90 and $CRUISE_ENABLED => CRUISE_SPEED := ?X;; CS599 Formal Methods in Software Architectures

  25. Cruise Interface (6) (?X : INT) Change_In_Speed(?X) where $BRAKE_PRESSED := False and $ACCEL_PRESSED := False and ?X <$CRUISE_SPEED and ?X>30 =>SignalAccelerator($CRUISE_SPEED);; (?X : INT) Change_In_Speed(?X) where $BRAKE_PRESSED := False and $ACCEL_PRESSED := False and ?X >$CRUISE_SPEED and ?X<90 =>SignalBrake($CRUISE_SPEED);; End Cruise; CS599 Formal Methods in Software Architectures

  26. The Architecture(1) achitecture cruise_control() return root is D : Driver; A : Accelerator; B : Brake; S : SpeedMeter; C : Cruise; connect D.Press_Cruise_On() => C.Cruise_On(); D.Press_Accelerator() => A.Pressed(); (?X : INT) A.IncreaseSpeed(?X) => S.IncreaseSpeed(?X); (?X : INT) S.SpeedCheck(?X) => C.Speed_Check(?X) D.Press_Cruise_Set() => C.Cruise_Set(); D.Press_Brakes() => C.Cruise_Disabled(); D.Press_Cruise_Resume() => C.Cruise_Resume(); CS599 Formal Methods in Software Architectures

  27. The Architecture(2) D.Release_Accelerator() => A.Released(); A.Cruise_Again() => C.Cruise_Again(); D.Press_Cruise_Set() => C.Cruise_Set(); D.Press_Cruise_Accelerate() => S.Cruise_Acc(); (?X : INT) S.Cruise_accl_dcl(?X) => C.CruiseAccelDecel(?X); D.Press_Cruise_Decelerate() => S.Cruise_Dec(); (?X : INT) S.Cruise_accl_dcl() => C.CruiseAccelDecel(?X); (?X : INT) C.Change_In_Speed(?X) => S.UpHill(?X); (?X : INT) C.Change_In_Speed(?X) => S.DownHill(?X); D.Press_Cruise_Off() => C.Cruise_Off(); end cruise_control; CS599 Formal Methods in Software Architectures

  28. Conclusions • Using Rapide we can simulate executions of the system and verify that the traces of those executions conform to the high level specifications of the desired behavior. • Rapide concepts are being used for complex event processing. • Applications of Complex Event Processing: • Network Monitoring and Management • Network Intrusion Detection • Extensive tool support • Huge Language • The learning curve is high • The manuals are not very user friendly CS599 Formal Methods in Software Architectures

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