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384 Case Study Feeding Unit Image. On the reception of a feed message, the Feeding Unit adds a new item to the mailing product. The unit can detect the occurrence of an incorrectly fed item (misFed) as well as the erroneous situation that more than one copy of the item was fed (doubleFed). It is further possible to detect whether the Feeding Unit is mounted to the station or not by a continuous status message (mounted,notMounted). Before any item is actually being fed, the Service Scheduler investigates the services offered by the feeder station. For this purpose it requests the status of the Feeding Unit Image. The image answers whether a Feeding Unit is mounted, and if so what Service it offers 8 . Upon reception of the schedule message, the Service Scheduler asks the appropriate Product Info Keeper for each offered service 9 whether this service is required. In case the feeding service is required, the Service Scheduler commands the Feeding Unit Image to perform the feed action for the appropriate mailing product. Based on the Initial Position, the Feeding Unit Image can calculate at what position the feed action actually has to take place. Subsequently the Feeding Unit Image requests the Transporter Image to get woken at this position. If it receives the wakeUp message, the Feeding Unit Image triggers the Feeding Unit and monitors if the feed action is carried out properly. After successful completion of the feed action, the Service Administrator is informed and this administrator updates the appropriate product Info Keeper. The situation that the feed action is not completed successfully is not covered in this scenario. 12.3.5 Other Scenarios and Other Stations The Product Flow Scenario and Feeding Scenario only address a (simplified) part of the necessary behaviour. Together the scenarios describe a number of essential objects and flows to perform the normal course of behaviour of a production line. But even for this purpose the scenarios are not complete. To achieve completeness and to study and specify other forms of behaviour, other scenarios had to be elaborated. Examples of important scenarios are: Batch job preparation scenario. Initialisation and configuration scenario. Error handling scenario. Maintenance, repair and test scenario. Product information distribution scenario. Failure effect analysis scenario. 8 The service can for instance be the feeding of a floppy disk or of a certain magazine. 9 In case of the feeder station, at most one service can be offered. In general, a station can perform many services.
12.3 The Essential Specification 385 Each of these scenarios results in new objects and flows or may result in the modification of already existing objects and flows. The scenarios mentioned above are not elaborated in this thesis. When all scenarios are assembled, a complete graphical specification is obtained. The assembly of the Product Flow Scenario and Feeding Scenario yields the Message Flow Diagram given in Figure 12.6. The diagram consists of a generic part and a station accept(PI) Product_ Input_ Handler currentPosition (InitialPosition) productArrived productArrived Transporter_ Image move(Speed) Transporter schedule (PIKeeperId, InitialPosition) wakeAt(Position,Id)/ wakeup(Id) encoderPulse free(PIKeeperId) store(PIKeeperId,PI) Service_ Scheduler Product_ Info_ Keeper feed(PIKeeperId,InitialPosition) giveStatus/ notMounted, mounted(Service) wakeAt(Position,Id)/ wakeup(Id) wakeAt(Position,Id)/ wakeup(Id) stop,start serviceRequired (PIKeeperId, Service)/ required, notRequired handOver(PIKeeperId,InitialPosition) Feeding_Unit_ Image mounted, feed notMounted misFed, doubleFed Feeding_ Unit retrieve(PIKeeperId)/take(PI) servicePerformed (PIKeeperId,Service) feedReady (ProductInfoKeeperId, Service) Service_ Administrator Images_Of_ Other_Functional_ Units Other_Functional_ Units Figure 12.6: Scenario Assembly of Feeder Station Feeder_Station Feeder_Controller Product_ Output_ Handler accept(PI) specific part. The station specific part is indicated by the dashed rectangular box. The other objects and flows are generic. This means that these objects and flows can also be used to specify other stations. The specific part of other stations depends on their supported functional modules. These modules as well as their images are shown in Figure 12.6 as dashed objects and terminators. 12.3.6 Instance Structure Diagrams The Message Flow Diagrams of the previous sections describe objects and their communication flows. The diagrams do not show on what channels the different messages are
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Specification of Reactive Hardware/
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to Leny, Inge and our parents
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Contents Acknowledgements v 1 Intro
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CONTENTS ix 4.6.5 Aggregate Semanti
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CONTENTS xi 6 Modelling of Concurre
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CONTENTS xiii 6.6.7.2 System Specif
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CONTENTS xv 11.4.2.3 Requirements C
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List of Figures 1.1 Chapter Overvie
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LIST OF FIGURES xix 6.16 Strongly D
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Chapter 1 Introduction 1.1 Objectiv
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1.1 Objectives 3 understood and sti
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1.1 Objectives 5 Informal and Forma
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1.2 Thesis Organisation 7 Chapter 1
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1.2 Thesis Organisation 9 Recommend
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Chapter 2 On Specification of React
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2.3 Specifications, Models and View
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2.4 Specification Languages, Formal
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2.4 Specification Languages, Formal
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2.5 Modelling Concepts 23 entirety.
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2.5 Modelling Concepts 25 Tradition
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2.6 Activity Frameworks for Specifi
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2.6 Activity Frameworks for Specifi
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2.7 Summary 31 offer many guideline
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Chapter 3 Concepts for Analysis, Sp
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3.3 Concepts 35 3. creation of a sy
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3.5 Combining Compatible Concepts 3
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3.6 Practical Use of Concepts 39 3.
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3.6 Practical Use of Concepts 41 Th
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3.6 Practical Use of Concepts 43 ac
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3.6 Practical Use of Concepts 45 ac
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3.6 Practical Use of Concepts 47 wa
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3.6 Practical Use of Concepts 49 Ge
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3.6 Practical Use of Concepts 51 Re
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3.7 Summary and Concluding Remarks
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Chapter 4 Abstraction of a Problem
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4.1 Introduction 57 earlier phase t
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4.2 Objects 59 An object can mean t
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4.2 Objects 61 wonder what other ob
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4.3 Classes 63 A message interface
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4.3 Classes 65 Class B Attributes M
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4.4 Data Objects and Process Object
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4.5 Clusters 79 flows. Clusters ena
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4.6 Aggregates 81 Therefore a compl
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4.6 Aggregates 83 4.6.4 Clustered A
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4.6 Aggregates 85 An old philosophi
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4.7 Identity and Object Identifiers
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4.8 Properties of Composites 89 for
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4.8 Properties of Composites 91 com
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4.8 Properties of Composites 93 Whe
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4.8 Properties of Composites 95 In
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4.9 Channel Hiding 97 Servant A Sup
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4.11 Composites and Hierarchies 99
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4.12 Object Variety 101 Part class
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4.13 Object Class Models 103 Anothe
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4.13 Object Class Models 105 of obj
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4.14 Attributes and Variables 107 c
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4.14 Attributes and Variables 109 4
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4.15 Operations, Services, Methods
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4.15 Operations, Services, Methods
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4.17 Summary 115 Accidental Propert
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Chapter 5 Concepts for the Integrat
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5.2 Architecture 119 Requirements D
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5.3 Design Philosophy 121 this. The
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5.4 Essential Model and Extended Mo
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5.4 Essential Model and Extended Mo
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5.6 Architecture and Implementation
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5.7 Views 129 Management £ £ £ P
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5.7 Views 131 Behaviour Behaviour U
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5.8 Boundaries 133 5.8 Boundaries 5
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5.8 Boundaries 135 x x Object A y z
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5.8 Boundaries 137 x w w x Object A
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5.8 Boundaries 139 In Chapter 10 we
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5.9 Transformations 141 The modific
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5.10 Formalisation 143 Level 1 Leve
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5.11 Summary 145 Behaviour Requirem
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Chapter 6 Modelling of Concurrent R
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6.2 Concurrency and Synchronisation
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6.3 Communication 157 between proce
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6.3 Communication 159 or to transfo
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6.3 Communication 161 6.3.3.4 Messa
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6.3 Communication 163 Synchronous m
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6.3 Communication 165 channel-name
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6.3 Communication 167 can be descri
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6.3 Communication 169 statement aft
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6.3 Communication 171 (normalCourse
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6.3 Communication 173 ∞ client re
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6.3 Communication 175 There is a gr
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6.3 Communication 177 process A pro
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6.3 Communication 179 Clocks An int
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6.3 Communication 181 whether the s
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6.3 Communication 183 6.3.9.4 Model
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6.3 Communication 185 6.3.10.2 Desc
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6.4 Distribution 187 force to take
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6.4 Distribution 189 is that the in
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6.4 Distribution 191 links to each
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6.4 Distribution 193 6.4.6 Distribu
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6.5 Scenarios 195 entities. This su
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6.5 Scenarios 197 startJob readyToA
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6.5 Scenarios 199 collection of tex
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6.6 Dynamic Behaviour 201 selection
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6.6 Dynamic Behaviour 203 processes
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6.6 Dynamic Behaviour 205 even for
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6.6 Dynamic Behaviour 207 with the
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6.6 Dynamic Behaviour 209 6.6.4 Sep
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6.6 Dynamic Behaviour 211 6.6.5 Mod
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6.6 Dynamic Behaviour 213 to pay at
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6.6 Dynamic Behaviour 215 A method
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6.6 Dynamic Behaviour 217 to happen
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6.6 Dynamic Behaviour 219 c a Multi
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6.6 Dynamic Behaviour 221 but not t
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6.7 Real-Time Modelling 223 claimed
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6.7 Real-Time Modelling 225 in the
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6.8 Summary 227 They can graphicall
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Chapter 7 Introduction to the Seman
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7.2 A Brief Language Characterisati
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7.3 The Role of Semantics 233 7.3 T
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7.4 Mathematical Preliminaries 235
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7.4 Mathematical Preliminaries 237
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7.5 Concluding Remarks 239 0 ¡ Bin
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Chapter 8 Data Part of POOSL Chapte
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8.3 Formal Syntax 243 runk, and cun
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8.4 Context Conditions 245 Further,
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8.5 A Computational Semantics 247 T
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8.5 A Computational Semantics 249 w
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8.5 A Computational Semantics 251 s
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8.6 Primitive deepCopy Messages 253
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8.6 Primitive deepCopy Messages 255
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8.7 Example: Complex Numbers 257 is
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8.8 Summary and Concluding Remarks
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Chapter 9 Process Part of POOSL Cha
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9.3 Formal Syntax 263 In almost any
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9.3 Formal Syntax 265 The fourth st
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9.3 Formal Syntax 267 call of the f
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9.4 Context Conditions 269 We are n
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9.5 A Computational Interleaving Se
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9.6 Example: A Simple Handshake Pro
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9.7 The Development of POOSL 291 is
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9.7 The Development of POOSL 293 da
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9.7 The Development of POOSL 295 e
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9.7 The Development of POOSL 297 Em
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9.7 The Development of POOSL 299 (o
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9.8 Summary 301 To prepare the deve
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Chapter 10 Behaviour-Preserving Tra
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10.2 Instance Structure Diagrams 30
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10.2 Instance Structure Diagrams 30
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10.3 Some Properties of Transformat
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10.4 A System of Basic Transformati
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10.5 Example: The Elevator Problem
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10.7 On the Fundamental Limitations
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10.7 On the Fundamental Limitations
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10.8 Summary 331 are transformation
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Page 355 and 356: 11.2 SHE Context and Phases 335 Inf
Page 357 and 358: 11.2 SHE Context and Phases 337 a p
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Page 361 and 362: 11.3 SHE Framework 341 the system.
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Page 397 and 398: 12.2 Initial Requirements Descripti
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Page 417 and 418: 12.4 Towards an Extended Specificat
Page 419 and 420: 12.5 Concluding Remarks 399 i1 DIST
Page 421 and 422: 12.5 Concluding Remarks 401 Feeder
Page 423 and 424: Chapter 13 Conclusions and Future W
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Page 429 and 430: 13.4 Related Results 409 The notion
Page 431 and 432: Appendix A The POOSL Transition Sys
Page 433 and 434: A.1 The Data Part of POOSL 413 (12)
Page 435 and 436: A.2 The Process Part of POOSL 415 A
Page 437 and 438: A.2 The Process Part of POOSL 417 (
Page 439 and 440: A.2 The Process Part of POOSL 419 (
Page 441 and 442: A.2 The Process Part of POOSL 421 i
Page 443 and 444: Appendix B Proofs of Propositions a
Page 445 and 446: Proofs of Propositions and Transfor
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Appendix C Glossary of Symbols This
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Glossary of Symbols 437 267 Cp ¥¡
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References [AB90] P. America and F.
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REFERENCES 441 [C [C [C 86] B. Cohe
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REFERENCES 443 [Her90] A.J.H. Herbe
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REFERENCES 445 [MV93] S. Mauw and G
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REFERENCES 447 [vE89] P. van Eijk.
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Index abort, 297 abstract action so
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INDEX 451 strong, 190, 293 subsyste
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INDEX 453 delay, 178 do-statement,
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Summary This combined thesis descri
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Samenvatting Dit gecombineerde proe
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Curricula Vitae Piet van der Putten
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