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OCSMP Model User > Module 6 - Activity Diagram Part 2 > Flashcards

Module 6 - Activity Diagram Part 2 Flashcards

1
Q

what kind of model element is Enter Final Orbit?

A

Call behavior action

the Enter final orbit is calling a behavior that has been defined in the model .

Name : Behavior

there are three kinds of behaviors
1. activity
2. state machine
3. Interaction

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2
Q

Which kind of action represents a behavioral decomposition

call behavior action or send signal action ?

A

Call behavior action

It represents a defined behavior in the model

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3
Q

rake symbols are displayed when one activity calling another _____

A

activity

why is there a special notation ? the rake symbol is used anywhere that the modeler wants to indicate hierarchical representation

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4
Q

This call behavior is synchronous , the action that calls fire thruster waits for it to finish executing then the action that calls it finishes executing then produces a _______

A

control token

notes : call behavior actions can call a behavior sync and asycn , its a checkbox in the specifications in cameo

when the action comes to an end , it produces a control token. It calls the behavior fire thruster to start its execution.

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5
Q

what kind of action is this ?

A

send signal action

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6
Q

three criteria that must be satisfied ? what does the action require to start executing ?

  1. the activity that owns the action is currently executing
  2. a control token arrives on each of the incoming control flows
  3. a sufficient number of object tokens arrive on ___
A

each of the incoming object flows to meet the min multiplicity of the respective pin

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7
Q

key idea of a send signal action

send signal sends an instance of a signal to a target object to asynchronously trigger a behavior in that target object , then that send signal action ______

A

terminates

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8
Q

the send signal action asynchronously generates and send a signal once the

A

currentRadiusOrbit token arrives

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9
Q

Review of a signal
- signals are elements of definition , it defines something
- a signal defines an asynch event that could occur in time.

A
  • once a signal is defined there could be multiple occurrences/ instances of that signal sent and received
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10
Q

a reception would be triggered by an arrival of a matching _____
a reception can only be invoked asynchronously

A

signal

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11
Q

what is analogTempDataSampled ?

A

a reception

the signal also matches the receptions name

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12
Q

signals and receptions are always ( fire and forget)
receptions are behaviors that can only behave

A

asynchronous

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13
Q

a send signal action models the sending of an the name of the ________ being sent

A

name of the signal being sent

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14
Q

when a signal arrive
1) can trigger a matching reception to trigger a new behavior
2) can also trigger an accept event ________
3) when a signal instance arrives it can also trigger a transition in a state machine behavior

A

action

an accept event action waits for an event to arrive , then it will execute

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15
Q

which is the client ?

which is the target ?

A

send signal action is the client

accept event action is the target

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16
Q

what is attitiudeUpdated ?

A

the signal being sent to the target.. it is not the name of the send signal action

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17
Q

if a signal has been updated , Cameo updates the send signal action input ____ on the send signal action

A

Pins

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18
Q

what is authenticationResponseSent ?

The ______ that has been assigned to a send signal action

A

signal

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19
Q

what does this accept event action require to start executing ?

A

when a control token is received

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20
Q

What type of action do you use when you want to wait for an event to occur before allowing execution to proceed ?

A

accept event actions

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21
Q

why not call it an accept signal action instead of accept event action ?

A

accept event action can wait for any of these events not just signals
1. signal event
2. call event
3. change event
4. time event

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22
Q

in the language there are 4 kinds of events defined to model an event occurrence that may trigger an execution of a behavior

  1. signal event
  2. call event
  3. change event
    4.

a event occurs at some discrete moment in time it has no duration

A

time event

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23
Q

a event occurs at some discrete moment in time it has no ________
a behavior occurs at some moment in time it may trigger an execution of a behavior

A

duration

24
Q

what is an event pool ?

A

an event pool - abstract concept its not a model element thats baked in to the rules of the language on how

picture a **bucket **where event occurrences get buffered until a behavior consumes it

each instance of an object owns its own event pool

25
Q

When does the activity look at the owning object event pool to see if that specified event has or has not yet occured ?

only when an __________action is executed

A

accept event

each instance owns its private event pool
each instance could be executing multiple behaviors
each behavior does not have their own event pool

26
Q

when an a control token arrives the accept event action looks at the event pool for

A

a signal

27
Q

if two activities are competing with each other ( looks at the event pool for a signal ) is an example of a ______ condition

A

race condition

28
Q

the owning activity looks at the event pool only when a ______________ action is executing . Not when a basic action is executing or any other action is occurring

A

accept event action

29
Q

if two behaviors are waiting for the same signal in the event pool

A

its non deterministic . you cant tell which action will consume it

30
Q

Review
a wait time action is waiting specifically for a time event trigger

A

an accept event controls the flow of execution waiting for a signal to arrive in an event pool.

30
Q

a wait time action is waiting specifically for a time event trigger
not a signal
not a call event
not a change event

A

an accept event controls the flow of execution waiting for a signal to arrive in an event pool.

31
Q

two kinds of time event
1. absolute begins with the keyword at
2. relative time event begins with

A

the keyword after

32
Q

what kind of time event is this ?

A

absolute time event – begins with at

33
Q

what kind of time event is this ?

A

relative time event – begins with after

34
Q

what is this narritive

A

a continuous periodic behavior
a wait time action with incoming edges
when the activity begins every 2 mins the fire thruster behavior executes

35
Q

when is a accept event action continuously enabled

A

no incoming edges on an accept event it remains continuously enabled , it never terminates

36
Q

what kind of node is used to steer the execution of an activity along a path ?

A

control nodes —– dashed lines
control nodes can direct the path of control tokens as well as object tokens

37
Q

three ways an activity can terminate

a token arrives at an activity final node
all actions within the activity terminate
another behavior can ______terminate the activity

A

externally

38
Q

if any token arrives at an activity final node all the actions

A

terminate

39
Q

special rule

when an accept event action has no incoming action this action never _______ and it becomes continuously enabled

A

terminates

40
Q

7 kinds of control nodes

  1. initial node
  2. activity final node
  3. flow final
  4. decision node
    5 merge node
  5. fork node
    7.
A

join node

41
Q

what two controls nodes are shown here ?

A

initial node
fork node ( multiple edges going out of it )

42
Q

what do all control nodes have in common ?

  1. all control nodes are used to define control logic
  2. control nodes do not execute
  3. the rules for all control nodes are expressed in terms of token ______
A

flows

43
Q

what does an initial node do ?

A

marks the start of control flow within the activity
tokens traverse edges in zero time. the moment the activity begins

44
Q

when the owning activity begins executing a control token gets places on each initial _________

A

node. those tokens flow concurrently and independently

45
Q

is an initial node a requirement for an activity diagram ?

A

No

46
Q

ma does have an incoming edges or control flows , when does this action start executing ?

A

when the owning activity begins the action ma begins

47
Q

what does an activity final node represent ?
termination of the execution of the action
when any token ( object flow or control flow ) arrives it terminates an activity

A

an activity final node can have multiple edges coming into it , Can either be a control node or object node

its not a requirement for an activity to have a final node .

48
Q

key ideas of a flow final node
1. marks the end of a single sequence of actions , not the entire activity
2. a flow final node can have a control flow or object flow arriving into it.
3. when 1 token arrives it ends the sequence of the action not the activity itself
4. flow final nodes are not required in the diagram

A
  1. multiple edges can come in into flow final node
49
Q

key idea of decision node
1. a decision node represents an a OR statement .
2. when any token arrives at a decision node , all guard expressions are evaluated . if 1 guard is true then the token is passed on that edge

how about if multiple guards are true ?

A

it becomes non-deterministic , the reader cant know which path the tokens takes

50
Q

key idea of a fork node
when a token arrives at a fork node those tokens are duplicated and tokens .
tokens flow concurrently and

A

independently

if control flow comes in , control flow comes out
if object flow comes in , object flow comes out

51
Q

join node
all three of these actions must come to a stop before the action is

A

is done executing

join node serves as a synchronization point

52
Q

scenarios for Join node
only control flows come in and only a single control token flows out
only object flows come in and ** all ** object nodes flow out
if a control and object nodes are in a join node … all the object tokens must arrive and no control tokens are

A

passed

53
Q

Activity partition
displays who does what . An activity partition conveys _______

A

allocation

totally optionally to add this in your diagrams

53
Q

the column flight computer is a an element that you have assigned to that activity

A

partition .

54
Q

four common elements to add that are structural representations in an activity partition
1. part property
2. block
3. actor
4.

A

reference property

55
Q

greatest weakness of activity partitions ?

A

cannot determine which element invokes an action

OCSMP Model User (16 decks)

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