Transition

© Copyright 2020 Darren R C Kelly (Webel IT Australia).

Read more about Screencast: The Webel Digital Twin Pattern for SysML: Part 1: Simulating acquisition or creation of physical assets using Activities and StateMachines in Cameo Simulation Toolkit.

23: Mini StateMachine for DigitalTwin and DoAttach effect Activity

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SysML Activity Diagram

SysML StateMachine Diagram

22: Mini StateMachines for @Entity, PotentialPhysicalAsset, ActualPhysicalAsset

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TRAIL: A SysML Pattern for Digital Twinning

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SysML StateMachine Diagram

Chain on a CallBehaviorAction for an Operation trigger of a Transition with an effect

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HOWTO return chain on a CallBehaviorAction for an Operation trigger of a Transition with an effect

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Slide kind

hybrid diagram

SysML Activity Diagram

SysML Block Definition Diagram (BDD)

SysML StateMachine Diagram

HOWTO return chain on a CallBehaviorAction for an Operation trigger of a Transition with an effect

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Chain on a CallBehaviorAction for an Operation trigger of a Transition with an effect

Sections

Screencast: UML/SysML: HOWTO Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

Keywords

Magic Model Analyst [Cameo Simulation Toolkit]

Unified Modeling Language

Cameo Systems Modeler

Systems Modeling Language

UML

SysML

MagicDraw SysML

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narrated

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© Copyright 2020 Darren R C Kelly (Webel IT Australia). All rights reserved.

Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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Tutorial

UML/SysML: HOWTO Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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Slide kind

hybrid diagram

UML Activity Diagram

UML Class Diagram

UML StateMachine Diagram

UML/SysML: HOWTO Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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Consume a SignalEvent message in a StateMachine Transition 'effect' or State 'entry' or 'exit' Activity

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Screencast: UML/SysML StateMachines: How a completion transition works (and why you should avoid them)

Keywords

Magic Model Analyst [Cameo Simulation Toolkit]

Unified Modeling Language

Cameo Systems Modeler

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narrated

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Explains what a completion transition is and how to simulate and explore it in Cameo Simulation Toolkit for MagicDraw UML, MagicDraw SysML, or Cameo Systems Modeler.

Please note that this is NOT a recommendation to use completion transitions!

© Copyright 2020 Darren R C Kelly (Webel IT Australia). All rights reserved.

Completion events have dispatching priority. That is, they are dispatched ahead of any pending Event occurrences in the event pool.

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Unified Modeling Language 2.5.1

In case of simple States, a completion event is generated when the associated entry and doActivity Behaviors have completed executing. If no such Behaviors are defined, the completion event is generated upon entry into the State.

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Unified Modeling Language 2.5.1

The event that enables this trigger is called a completion event and it signifies that all Behaviors associated with the source State of the completion Transition have completed execution.

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Unified Modeling Language 2.5.1

14.2.3.8.3 Completion Transitions and completion events: A special kind of Transition is a completion Transition, which has an implicit trigger.

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Unified Modeling Language 2.5.1

UML-2.5.1 does NOT permit a trigger or guard on a Transition from an initial pseudostate in a StateMachine but Cameo/MagicDraw does (please avoid).

UML-2.5.1: Has an incorrect local Transition with same source and vertex in 'Figure 14.34 Local Transitions'

Transitions of the kind internal are not shown explicitly in diagrams.

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Unified Modeling Language 2.5.1

kind = internal ... This kind of Transition can only be defined if the source Vertex is a State.

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Unified Modeling Language 2.5.1

kind = internal is a special case of a local Transition that is a self-transition (i.e., with the same source and target States), such that the State is never exited (and, thus, not re-entered), which means that no exit or entry Behaviors are executed ...

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Unified Modeling Language 2.5.1

kind = local ... However, for local Transitions the target Vertex must be different from its source Vertex. A local Transition can only exist within a composite State.

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Unified Modeling Language 2.5.1

kind = local is the opposite of external, meaning that the Transition does not exit its containing State (and, hence, the exit Behavior of the containing State will not be executed). ...

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Unified Modeling Language 2.5.1

kind = external means that the Transition exits its source Vertex. If the Vertex is a State, then executing this Transition will result in the execution of any associated exit Behavior of that State.

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Unified Modeling Language 2.5.1

The semantics of a Transition depend on its relationship to its source Vertex. Three different possibilities are defined, depending on the value of the Transition’s kind attribute ...

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Unified Modeling Language 2.5.1

When multiple triggers are defined for a Transition, they are logically disjunctive, that is, if any of them are enabled, the Transition will be triggered.

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Unified Modeling Language 2.5.1

A Transition may own a set of Triggers, each of which specifies an Event whose occurrence, when dispatched, may trigger traversal of the Transition. A Transition trigger is said to be enabled if the dispatched Event occurrence matches its Event type.

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Unified Modeling Language 2.5.1

Transitions are executed as part of a more complex compound transition that takes a StateMachine execution from one stable state configuration to another.

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Unified Modeling Language 2.5.1

NOTE. The duration of a Transition traversal is undefined, allowing for different semantic interpretations, including both “zero” and non-“zero” time.

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Unified Modeling Language 2.5.1

It may have an associated effect Behavior, which is executed when the Transition is traversed (executed).

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Unified Modeling Language 2.5.1

A Transition is a single directed arc originating from a single source Vertex and terminating on a single target Vertex (the source and target may be the same Vertex), which specifies a valid fragment of a StateMachine Behavior.

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Unified Modeling Language 2.5.1

Transitions

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

This is a Transition that originates in the history Pseudostate and terminates on a specific Vertex (the default history state) of the Region containing the history Pseudostate. This Transition is only taken if execution leads to the history Pseudostate a

Source

Unified Modeling Language 2.5.1

Pseudostates - deepHistory and shallowHistory

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

Pseudostates - choice

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

Pseudostates - junction

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

Pseudostates - initial, fork, join, terminate

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

Using submachines

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

Slide kind

UML StateMachine Diagram

If there is no outgoing Transition inside the composite State, then the incoming Transition simply performs a default State entry.

Source

Unified Modeling Language 2.5.1

In effect, the latter is a continuation of the external incoming Transition, with the proviso that the execution of the entry Behavior of the composite State (if defined) occurs between the effect Behavior of the incoming Transition and the effect ...

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Unified Modeling Language 2.5.1

Entry points represent termination points (sources) for incoming Transitions and origination points (targets) for Transitions that terminate on some internal Vertex of the composite State.

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Unified Modeling Language 2.5.1

If the composite State has an exit Behavior defined, it is executed after any effect Behavior of the incoming inside Transition and before any effect Behavior of the outgoing external Transition.

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Unified Modeling Language 2.5.1

In a well-formed model, such a Transition should have a corresponding external Transition outgoing from the same exit point, representing a continuation of the terminating Transition.

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Unified Modeling Language 2.5.1

Exit points are the inverse of entry points. That is, Transitions originating from a Vertex within the composite State can terminate on the exit point.

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Unified Modeling Language 2.5.1

Submachines: entryPoint and exitPoint

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

Regardless of how a State is entered, the StateMachine is deemed to be “in” that State even before any entry Behavior or effect Behavior (if defined) of that State start executing.

Source

Unified Modeling Language 2.5.1

If the Transition explicitly enters one or more Regions (in case of a fork), these Regions are entered explicitly and the others by default.

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Unified Modeling Language 2.5.1

If the Transition terminates on the edge of the composite State (i.e., without entering the State), then all the Regions are entered using the default entry rule above.

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Unified Modeling Language 2.5.1

If the composite State is also an orthogonal State with multiple Regions, each of its Regions is also entered, either by default or explicitly.

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Unified Modeling Language 2.5.1

Transition::trigger : Trigger [0..*] ... Specifies the Triggers that may fire the transition

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Unified Modeling Language 2.5.1

Transition::target : Vertex [1..1] ... Designates the target Vertex that is reached when the Transition is taken.

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Unified Modeling Language 2.5.1

Transition::source : Vertex [1..1] ... Designates the originating Vertex (State or Pseudostate) of the Transition.

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Unified Modeling Language 2.5.1

Transition::/redefinitionContext : Classifier [1..1] ... References the Classifier in which context this element may be redefined.

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Unified Modeling Language 2.5.1

Transition::redefinedTransition : Transition [0..1] ... The Transition that is redefined by this Transition.

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Unified Modeling Language 2.5.1

Transition::guard : Constraint [0..1] ... If the guard is true at that time, the Transition may be enabled, otherwise, it is disabled. Guards should be pure expressions without side effects. Guard expressions with side effects are ill formed.

Source

Unified Modeling Language 2.5.1

Transition::guard : Constraint [0..1] ... A guard is a Constraint that provides a fine-grained control over the firing of the Transition. The guard is evaluated when an Event occurrence is dispatched by the StateMachine. ...

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Unified Modeling Language 2.5.1

Transition::effect : Behavior [0..1] ... Specifies an optional behavior to be performed when the Transition fires.

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Unified Modeling Language 2.5.1

Transition::container : Region [1..1] ... Designates the Region that owns this Transition.

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Unified Modeling Language 2.5.1

Transition::kind : TransitionKind [1..1] = external Indicates the precise type of the Transition.

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Unified Modeling Language 2.5.1

A Transition represents an arc between exactly one source Vertex and exactly one Target vertex (the source and targets may be the same Vertex). It may form part of a compound transition, which takes the StateMachine from one steady State configuration...

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Unified Modeling Language 2.5.1

If the exit occurs through an exitPoint Pseudostate, then the exit Behavior of the State is executed after the effect Behavior of the Transition terminating on the exit point.

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Unified Modeling Language 2.5.1

Composite state entry and exit points

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Tutorial

TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

Slide kind

UML StateMachine Diagram

... the entry Behavior of the State is executed (if defined) upon entry, but only after any effect Behavior associated with the incoming Transition is completed.

Source

Unified Modeling Language 2.5.1

A State may have an associated entry Behavior. This Behavior, if defined, is executed whenever the State is entered through an external Transition.

Source

Unified Modeling Language 2.5.1

Effect, Entry, Do, Exit

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Tutorial

TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

Slide kind

UML StateMachine Diagram

StateMachine execution is represented by transitions from one active state configuration to another in response to Event occurrences that match the Triggers of the StateMachine.

Source

Unified Modeling Language 2.5.1

State configurations

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01:03: UML Behavior: StateMachines quick start

Slide kind

UML StateMachine Diagram

Kinds of States

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01:03: UML Behavior: StateMachines quick start

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UML StateMachine Diagram

uml101 - StateMachines - NOTATION REFERENCE CARD

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

Slide kind

UML StateMachine Diagram

01:03: UML Behavior: StateMachines quick start

TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

Slides in this section

If you want to navigate the entire section including the additional explanatory text click on the title link of the first slide to view the full slide page, then use the next links to move through the slide pages. If you just want to view the slide images only in sequence, click on any slide to view it larger in a viewer, then click again to move through each slide in this tutorial trail section.

Behavior StateMachines can be used to specify any of the following

StateMachines - simplified metaclass hierarchy

UML Event types for triggering Transitions

uml101 - StateMachines - NOTATION REFERENCE CARD

Kinds of States

State configurations

Effect, Entry, Do, Exit

Composite state entry and exit points

Submachines: entryPoint and exitPoint

Using submachines

Pseudostates - initial, fork, join, terminate

Pseudostates - junction

Pseudostates - choice

Pseudostates - deepHistory and shallowHistory

Transitions

Completion transitions and implicit triggers

The ActivityEdge, Transition, and Connector metaclasses do not extend (directly or indirectly) the Relationship metaclass (although the notations for them do indicate a kind of "relationship").

UML Event types for triggering Transitions

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TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo

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01:03: UML Behavior: StateMachines quick start

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UML Profile Diagram

UML2 StateMachine - metaclasses - ADVANCED REFERENCE ONLY

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01:02: UML 101 for model-based systems engineering with SysML

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UML2 simplified key "relationship" metaclasses hierachy - ADVANCED REFERENCE ONLY

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01:02: UML 101 for model-based systems engineering with SysML

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UML Profile Diagram

Parts in these systems may interact by many different means, such as software operations, discrete state transitions, flows of inputs and outputs, or continuous interactions.

Source

OMG Systems Modeling Language (SysML) 1.6

Figure D.8 - Finite State Machine Associated with “Drive the Vehicle”

Gallery

Tutorial

TRAIL: The SysML-1.6 Hybrid SUV sample and specification diagrams in MagicDraw/Cameo (with annotations) [UNDERGOING UPDATE to SysML1.7]

Section

Section: SysML-1.6: HSUV sample

Slide kind

SysML StateMachine Diagram

UML StateMachine Diagram

A StateMachine or composite State may contain multiple Regions representing behaviors that may occur in parallel.

Source

Unified Modeling Language 2.5.1

A Region is a top-level part of a StateMachine or a composite State, that serves as a container for the Vertices and Transitions of the StateMachine.

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Unified Modeling Language 2.5.1

external - Implies that the Transition, if triggered, will exit the composite (source) State.

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Unified Modeling Language 2.5.1

local - Implies that the Transition, if triggered, will not exit the composite (source) State, but it will exit and re-enter any state within the composite State that is in the current state configuration.

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Unified Modeling Language 2.5.1

An internal Transition can be taken even if the S[t]ateMachine is in one or more Regions nested within the associated State.

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Unified Modeling Language 2.5.1

internal - Implies that the Transition, if triggered, occurs without exiting or entering the source State (i.e., it does not cause a state change). This means that the entry or exit condition of the source State will not be invoked.

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Unified Modeling Language 2.5.1

TransitionKind is an Enumeration type used to differentiate the various kinds of Transitions.

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Unified Modeling Language 2.5.1

A Vertex is an abstraction of a node in a StateMachine graph. It can be the source or destination of any number of Transitions.

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Unified Modeling Language 2.5.1

A quick look at accessing an Operation on a Transition or ActivityEdge guard with Alf vs ALH

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Tutorial

HOWTO simulate UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit - Operation-driven Transition case study

Section

Slide kind

UML Activity Diagram

Screencast: Tutorial: UML/SysML: StateMachines vs Activities: Operation-driven Transition case study - UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit

Keywords

Magic Model Analyst [Cameo Simulation Toolkit]

Unified Modeling Language

Video style

narrated

screencast

4K

This video accompanies this detailed tutorial trail: HOWTO simulate UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit - Operation-driven Transition case study.

This full length tutorial is a case study of the telephone dialer StateMachine shown in 'Figure 14.7 Composite State with two States' of the UML-2.5.1 specification.

Read more about Screencast: Tutorial: UML/SysML: StateMachines vs Activities: Operation-driven Transition case study - UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit

The WhenValid Activity as effect Behavior

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Tutorial

HOWTO simulate UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit - Operation-driven Transition case study

Section

Slide kind

UML Activity Diagram

StateMachine for the Dialer class

Gallery

Tutorial

HOWTO simulate UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit - Operation-driven Transition case study

Section

Slide kind

UML StateMachine Diagram

Figure 14.7 Composite State with two States

Gallery

Tutorial

HOWTO simulate UML-2.5.1 'Figure 14.7 Composite State with two States' in Cameo Simulation Toolkit - Operation-driven Transition case study

Section

Slide kind

UML StateMachine Diagram

StateMachine diagram for comparing action language access to an operation for a guard

Gallery

Tutorial

HOWTO invoke an operation as a Transition guard in Cameo Simulation Toolkit

Section

Slide kind

UML StateMachine Diagram

shallowHistory – ... A single outgoing Transition from this Pseudostate may be defined terminating on a substate of the composite State. This substate is the default shallow history state of the composite State.

Source

Unified Modeling Language 2.5.1

shallowHistory – ... this type of Pseudostate is a kind of variable that represents the most recent active substate of its containing Region, but not the substates of that substate. A Transition terminating on this Pseudostate implies rest

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Unified Modeling Language 2.5.1

junction – ... If more than one guard evaluates to true, one of these is chosen. The algorithm for making this selection is not defined.

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Unified Modeling Language 2.5.1

entryPoint – ... NOTE. If the owning State has an associated entry Behavior, this Behavior is executed before any behavior associated with the outgoing Transition.

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Unified Modeling Language 2.5.1

In each Region of the StateMachine or composite State owning the entryPoint, there is at most a single Transition from the entry point to a Vertex within that Region.

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Unified Modeling Language 2.5.1

choice – This type of Pseudostate is similar to a junction Pseudostate ... and serves similar purposes, with the difference that the guard Constraints on all outgoing Transitions are evaluated dynamically ...

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Unified Modeling Language 2.5.1

(As a way of avoiding this situation in some cases, it is possible to associate a predefined guard denoted as “else” with at most one outgoing Transition. This Transition is enabled if all the guards attached to the other Transitions evaluate to false).

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Unified Modeling Language 2.5.1

junction – ...It may happen that, for a particular compound transition, the configuration of Transition paths and guard values is such that the compound transition is prevented from reaching a valid state configuration. In those cases, the entire ...

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Unified Modeling Language 2.5.1

.. a junction Pseudostate ... can be used to split an incoming Transition into multiple outgoing Transition segments with different guard Constraints.

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Unified Modeling Language 2.5.1

For example, a junction Pseudostate can be used to merge multiple incoming Transitions into a single outgoing Transition representing a shared continuation path.

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Unified Modeling Language 2.5.1

junction – This type of Pseudostate is used to connect multiple Transitions into compound paths between States.

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Unified Modeling Language 2.5.1

The Transitions outgoing from a fork Pseudostate cannot have a guard or a trigger.

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Unified Modeling Language 2.5.1

fork – fork Pseudostates serve to split an incoming Transition into two or more Transitions terminating on Vertices in orthogonal Regions of a composite State.

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Unified Modeling Language 2.5.1

Similar to junction points in Petri nets, join Pseudostates perform a synchronization function, whereby all incoming Transitions have to complete before execution can continue through an outgoing Transition.

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Unified Modeling Language 2.5.1

Transitions terminating on a join Pseudostate cannot have a guard or a trigger.

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Unified Modeling Language 2.5.1

join – This type of Pseudostate serves as a common target Vertex for two or more Transitions originating from Vertices in different orthogonal Regions.

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Unified Modeling Language 2.5.1

initial - ... It is the source for at most one Transition, which may have an associated effect Behavior, but not an associated trigger or guard.

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Unified Modeling Language 2.5.1

14.2.3.6 FinalState: FinalState is a special kind of State signifying that the enclosing Region has completed. Thus, a Transition to a FinalState represents the completion of the behaviors of the Region containing the FinalState.

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Unified Modeling Language 2.5.1

An exit point connection point reference as the source of a Transition implies that the source of the Transition is the exit point Pseudostate as defined in the submachine of the submachine State that has the exit point connection point defined.

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Unified Modeling Language 2.5.1

An entry point connection point reference as the target of a Transition implies that the target of the Transition is the entryPoint Pseudostate as defined in the submachine of the submachine State. As a result, the Regions of the submachine ...

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Unified Modeling Language 2.5.1

Connection point references are sources/targets of Transitions implying exits out of/entries into the submachine StateMachine referenced by a submachine State.

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Unified Modeling Language 2.5.1

Connection point references of a submachine State can be used as sources/targets of Transitions. They represent entries into or exits out of the submachine StateMachine referenced by the submachine State.

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Unified Modeling Language 2.5.1

Exiting via a FinalState or by a group Transition has the same meaning as for ordinary composite States.

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Unified Modeling Language 2.5.1

Any guards associated with these entry point Transitions must evaluate to true in order for the specification to be well formed.

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Unified Modeling Language 2.5.1

The entry, exit, and effect Behaviors and internal Transitions are defined as contained in the submachine State.

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Unified Modeling Language 2.5.1

Each ConnectionPointReference is matched by a corresponding entry or exit point in the referenced submachine StateMachine. This provides the necessary binding mechanism between the submachine invocation and its specification.

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Unified Modeling Language 2.5.1

A ConnectionPointReference represents a point on the submachine State at which a Transition either terminates or originates. That is, they serve as targets for incoming Transitions to submachine States, as well as sources for outgoing Transitions ...

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Unified Modeling Language 2.5.1

Submachines are a means by which a single StateMachine specification can be reused multiple times. They are similar to encapsulated composite States in that they need to bind incoming and outgoing Transitions to their internal Vertices.

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Unified Modeling Language 2.5.1

Screencast: Mini tutorial: UML/SysML: Cameo Simulation Toolkit: StateMachine with doActivity and a Transition with a ChangeEvent trigger

Keywords

SysML

UML

state machine

Magic Model Analyst [Cameo Simulation Toolkit]

Cameo Systems Modeler

MagicDraw UML

MagicDraw SysML

Video style

screencast

narrated

4K

A very simple demonstration of a StateMachine with a doActivity and a Transition that uses a trigger with a ChangeEvent for checking a value. Uses SysML but the same applies to UML.

Uses Magic Model Analyst^® (Cameo Simulation Toolkit^®) for MagicDraw SysML and Cameo System Modeler Enterprise Edition.

© Copyright 2020 Darren R C Kelly (Webel IT Australia). All rights reserved.

Screencast: Mini tutorial: UML/SysML: Cameo Simulation Toolkit: StateMachine with entry Activity and Transition guard

Keywords

SysML

UML

state machine

guard

Magic Model Analyst [Cameo Simulation Toolkit]

Cameo Systems Modeler

MagicDraw UML

MagicDraw SysML

Video style

screencast

narrated

4K

A very simple demonstration of a StateMachine with an entry Activity and Transitions that use guards to check a value. Uses SysML but the same applies to UML.

Uses Cameo Simulation Toolkit for MagicDraw SysML and Cameo System Modeler.

© Copyright 2020 Darren R C Kelly (Webel IT Australia). All rights reserved.

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