Architecture Modeling - SPES 2020

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Sequences of Events It is typical to specify the order of the occurrences of different events. To do so, there are two language constructs: and Event and then Event N times Event <strong>Architecture</strong> <strong>Modeling</strong> Sequences with “and then” The “and then” construct postulates a sequence of events. The following example demonstrates the use of the pattern. Requirement: When a crash was detected, first the airbag shall inflate and then the doors shall be unlocked. whenever CrashDetected occurs InflateAirbag and then UnlockDoors occurs. This pattern does not say anything about timing, it just specifies the order. To express timing behaviour it is possible to use intervals with the events. E.g. if the door shall be unlocked in at least 50 ms after the airbag inflated the pattern would look like this: whenever CrashDetected occurs ReCheckSensors and then InflateAirbag and then UnlockDoors during [0ms,50ms] and then EngineOff during [0ms,300ms] occurs. The “during” with timing entities differs semantically from the filter that can be used to constrain events. If “during” with timing entities is used in an “and then” statement the interval is demanding, i.e. that the event has to occur in the specified interval. The timer starts with the occurrence of the preceding event. If the event does not occur in the specified interval the “and then” statement continues its execution from the latest previous event in the chain, that was not constraint by timing properties. The clock for the interval with the timing constraints is restarted by this event. This means for the above example that a failing of the EngineOff events 300ms after the unlocking of the doors, the observer would wait for a new InflateAirbag message, since this event has no timing constraints to the preceding event. In contrast to timing intervals the use of events in the intervals is semantically identical to the filter described in section 0. This backtracking behaviour can be further specified by the use of brackets. whenever a occurs b and then (c and then d and then e during [0ms,7ms]) occurs. If e does not occur in the specified interval the observer would wait for a new c instead of a new d. 114/ 156
These events used in the “and then” statement, of course, can be also limited with conditions. In the corresponding observers an additional automaton is used to process the “and then” expression. idle idle idle idle start start pre e2 e:=true e = e1 and then e2 pre e1 e = e1 and then e2 during[3,5] start start e2 && (3
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Architecture Modeling ∗ Andreas B
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Contents 1 Introduction 1 2 Quick-T
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1 Introduction This document propos
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Architecture Modeling allowing to m
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Architecture Modeling creating a vi
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Architecture Modeling the design it
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Architecture Modeling of the logica
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Architecture Modeling realization o
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Architecture Modeling can usually o
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3 The Architecture Meta-Model In Se
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Abstraction-Levels (detail increase
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3.2.2 Functional Perspective Archit
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Architecture Modeling The semantics
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Architecture Modeling expressed by
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Architecture Modeling computing cap
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3.2.5 Geometrical Perspective Archi
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ShapeCompositionOperator intersecti
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Architecture Modeling The constrain
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Architecture Modeling of particular
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Architecture Modeling Shape that de
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Architecture Modeling Conjugation o
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ComponentC Architecture Modeling pa
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4 Steps in Component-Based Design T
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Architecture Modeling Assume/guaran
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Architecture Modeling When specifyi
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Architecture Modeling next selectio
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Architecture Modeling ports must ha
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established if (and only if): Archi
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Architecture Modeling The component
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Architecture Modeling 4.3.2 Establi
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Page 71 and 72: 5 Using the Architecture Meta-Model
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Page 115 and 116: 6.1.1.1.1 Attribuute Definit tion a
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Page 121 and 122: Formalization: whenever StartButton
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Page 125 and 126: 6.1.1.1.1.3 Conditions Conditions c
Page 127 and 128: 6.1.1.1.2.2 Seammless Con ncatenati
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Page 133 and 134: If the brake force is above 80% for
Page 135 and 136: Pattern S3: Failure shall not be ca
Page 137 and 138: Pattern S9: failureCondition failur
Page 139 and 140: Pattern R2: Event occurs each perio
Page 141 and 142: idle e1 |clk:=0 e2 && (l
Page 143 and 144: The function : allocates a singl
Page 145 and 146: Examplees of clocks: • Run: {c=0@
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Page 151 and 152: Architecture Modeling Definition 6.
Page 153 and 154: Architecture Modeling the one given
Page 155 and 156: Architecture Modeling Decomposition
Page 157 and 158: Bibliography [1] ARINC 653 - Avioni
Page 159 and 160: Architecture Modeling [26] Holger G
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