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276 Process Part of POOSL When an instance C c (E1 ¥¡ ¡ ¡ ¥ Er) of some cluster class C c P1 ¥¡ ¡ ¡ ¥ Pr with parameterised behaviour specification BSpec p is initialised, the expression parameters P1 ¥¡ ¡ ¡ ¥ Pr contained in BSpec p are syntactically substituted by data expressions E1 ¥¡ ¡ ¡ ¥ Er. To describe syntactic substitution we first introduce the set SSubst of syntactic substitution functions and let it range over g¥¡ ¡ ¡ . SSubst EPar £ EPar ¦ Exp We shall often write E1© P1 ¥¡ ¡ ¡ ¥ Er© Pr to denote a function g ¡ SSubst with g(Pi) Ei for i 1¥¡ ¡ ¡ ¥ r and g(P) P otherwise. For syntactic substitution function g and parameterised behaviour specification BSpec p we will write BSpec p § § g to indicate that the expression parameters of BSpec p are syntactically substituted as dictated by g. Syntactic substitution is inductively defined as Cpc ¡ PEr)§ g ¥¡ ¡ ¥ § (PE1 Cpc ¡ ¡ ¥ § § § g § g ¥¡ (BSpec (PE1 PEr ) p g § § g ¢ § ¢ § § g )§ 1 BSpecp2 (BSpecp1 ) (BSpecp2 ) (BSpec p (BSpecp f )§ § g (BSpec § p § g )§ f § § g g(P) P§ L)§ § g (BSpec p § § g ) ¢ g E§ § PEn))§ g (PE§ g § ¥¡ ¡ ¥¡ ¡ § g ¡ § § § ¥ g § ¥ ¡ § g g (PS§ § § § g );(PE§ § g § § g (PE§ § g (PE§ § g § ) § (PS1;PS2)§ § § g g § § g g § else § g § § )§ g fi § g fi PE§ § PE§ g § )§ g PS§ § § g (PE m(PE1 ) m(PE1 PEn ) (PS;PE) ) (x : PE) x : ) (u : PE) u : ) (PS1 );(PS2 ( if PE then PS1 if then PS1 PS2 ( do PE then PS od elsePS2 do then od The execution of a system always starts in a configuration reflected by some system specification, and it proceeds its execution through a sequence of consecutive configurations. A configuration can lead to another configuration by performing a transition step. Sometimes it is convenient to be able to retrieve the initial specification corresponding to some configuration. For this purpose, we have introduced the Reset operator. This operator is defined on extended behaviour specification and on configurations. The Reset of an extended behaviour specification is the corresponding initial behaviour specification, i.e., the behaviour specification describing the system in its initial state (before initialisation has taken place). The Reset of a configuration is the corresponding initial system specification, i.e., the system specification from which it is (probably) derived. One would expect that starting from the Reset of a configuration, it would be possible to return to that configuration within a finite amount of transition steps. However, from the fact that there exist configurations that can never be reached from any system specification, it is easy to see that this cannot be true. For such an ’unreachable’ configuration, the Reset is the system specification built from the same instances, in the same way as the configuration. For a ’reachable’ configuration, on the other hand, it is true that it can be reached from its corresponding Reset. Furthermore the Reset is the only specification L
9.5 A Computational Interleaving Semantics 277 from which it can be reached. The latter two properties, which are proved in [Voe95b], justify the well-definedness of function Reset: Reset(C p (E1 ¥¡ ¡ ¡ ¥ En)) C p (E1 ¥¡ ¡ ¡ ¥ En) Reset(§ S p£ e C p E1£ ¡ ¡ ¡£ En¢ C p (E1 ¥¡ ¡ ¡ ¥ En) Reset(Cc E1 ¥¡ ¡ ¡ ¥ En ) C § c ¥¡ ¡ ¡ ¥ (E1 En) Cc ¥¡ ¡ ¡ ¥ (E1 En) Reset(§ BSpec e C c E1£ ¡ ¡ ¡£ En¢ Reset(BSpece 1 ¢ BSpece2) Reset(BSpece ¢ 1) Reset(BSpece Reset(BSpec 2) e L) Reset(BSpece ) L Reset(BSpece f ) § Reset(BSpec e )§ f Reset( BSpece ¥ envs¥ Sysp e ) )¥ Reset(BSpec Sys ¥ ¥ Sys p ¥ Sys We conclude this subsection by considering context condition (10’) of Section 9.4. We defined this condition as (10’) The set of communication channels as well as the message interface defined in a class definition conform to the corresponding instance methods or behaviour specification. Since the precise meaning of this definition is not clear at all, and since the condition is important for our semantics, we will formally rephrase it. We will do this in terms of functions AASort and ChSort defined in this paragraph. (10’) Let CD p be a class definition of Sys p . Then (i) if CDp p process class C interface la 1 ¡ ¡ lam MD p ¡ ¡ i S p i , then ¨ £ £ ¡ ¡ ¡ communication channels ch1 ¡ ¡ chp message ¡ ¡ instance methods MDp1 ¡ ¡ MDpk ¡ , such that for each i ¡ ¡ 1 k AASort(S p § § ¡ k¦ i ) 0 i = £ ChSort(S p § § ¡ k¦ i ) 0 i = £ l a 1 ¥¡ ¡ ¡ ¥ la m ¦ ch1 ¥¡ ¡ ¡ ¥ chp ¦ ¨ (ii) if CDp ¡ ¡ ¡ ¡ communication channels ch1 ¡ ¡ chp message c cluster class C interface la 1 ¡ ¡ lam behaviour specification BSpecp , then AASort(BSpecp ¥ Sysp ) = £ la 1 ¥¡ ¡ ¡ ¥ lam ¦ ChSort(BSpecp ¥ Sysp ) = £ ¡ ¡ ¥ ¦ ¥¡ ch1 chp 9.5.3 The Labeled-Transition System In the previous subsection we have defined the collection of configurations Conf p and the collection of atomic actions Act of the labeled transition system (Conf p £ ¥ £ ¡ a ¡ Act¥ a Act¦ ). In this subsection we will take a closer look at the collection £ Act¦ ¡ £ ¡ a ) of labeled transition relations. Each a £ is a binary relation on Conf p . For configurations BSpece 1 ¥ envs1 ¥ Sysp ¥ Sys and BSpece 2 ¥ envs2 ¥ Sysp ¥ Sys ¥ ¥ , the intuitive meaning of e BSpec1 envs1 Sysp ¥ Sys ¥ ¥ £ a e BSpec2 envs2 Sysp ¥ Sys is that extended behaviour specifi- (with information cation BSpec e 1 (with information envs1, Sys p and Sys) leads to BSpec e 2 a
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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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Page 251 and 252: 7.2 A Brief Language Characterisati
Page 253 and 254: 7.3 The Role of Semantics 233 7.3 T
Page 255 and 256: 7.4 Mathematical Preliminaries 235
Page 257 and 258: 7.4 Mathematical Preliminaries 237
Page 259 and 260: 7.5 Concluding Remarks 239 0 ¡ Bin
Page 261 and 262: Chapter 8 Data Part of POOSL Chapte
Page 263 and 264: 8.3 Formal Syntax 243 runk, and cun
Page 265 and 266: 8.4 Context Conditions 245 Further,
Page 267 and 268: 8.5 A Computational Semantics 247 T
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Page 273 and 274: 8.6 Primitive deepCopy Messages 253
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Page 277 and 278: 8.7 Example: Complex Numbers 257 is
Page 279 and 280: 8.8 Summary and Concluding Remarks
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Page 283 and 284: 9.3 Formal Syntax 263 In almost any
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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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Chapter 11 SHE Framework Chapter 1
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11.2 SHE Context and Phases 335 Inf
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11.2 SHE Context and Phases 337 a p
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11.2 SHE Context and Phases 339 11.
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11.3 SHE Framework 341 the system.
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11.4 Essential Specification Modell
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11.5 Extended Specification Modelli
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Chapter 12 Case Study Chapter 1 Cha
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12.2 Initial Requirements Descripti
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12.3 The Essential Specification 37
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12.4 Towards an Extended Specificat
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12.5 Concluding Remarks 399 i1 DIST
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12.5 Concluding Remarks 401 Feeder
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Chapter 13 Conclusions and Future W
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13.2 P.H.A. van der Putten’s Cont
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13.2 P.H.A. van der Putten’s Cont
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13.4 Related Results 409 The notion
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Appendix A The POOSL Transition Sys
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A.1 The Data Part of POOSL 413 (12)
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A.2 The Process Part of POOSL 415 A
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A.2 The Process Part of POOSL 417 (
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A.2 The Process Part of POOSL 419 (
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A.2 The Process Part of POOSL 421 i
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Appendix B Proofs of Propositions a
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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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