Module 7 - Sequence Diagrams Part 1

Question 1

purpose of a sequence diagram is to define what kind of behaviors ?

Answer 1

interactions

Question 2

T/F execution is instance of a defined behavior

Answer 2

True

Question 3

7 common elements in a sequence diagram

1. lifeline
2. event occurrences
3. Messages
4. execution specification
5. constraint
6. combined fragment
   7 _________ uses

Answer 3

interaction uses

Question 4

Lifeline
is the ____ in the interaction behavior in a sequence diagram

Answer 4

participant

Question 5

time travels down the ________

Answer 5

lifeline

Question 6

what does the tail of a lifeline represent

Answer 6

a relative order of events / passage of time

Question 7

is it legal for an interaction to be owned by a block ?

Answer 7

yes

Question 8

a lifeline commonly corresponds to a part property or _________ of a block .

Answer 8

reference property

lifeline corresponds to a property of an owning block

Question 9

each lifeline represents a single instance of its type.. never multiple ____

Answer 9

instances

Question 10

a selector expression names a specific instance that the lifeline _________

Answer 10

represents

Question 11

an instance specification [fc s/n 111] was assigned to be a selector __________

Answer 11

selector expression

the instance specification might not be nested in the same location as the interaction or owning block

Question 12

behavior execution start and behavior execution termination is a kind of what ?

Answer 12

event occurrence

Question 13

message send and message receive occurrence is a kind of

Answer 13

event occurrence

Question 14

six kinds of event occurrences are
1. behavior execution start
2. behavior execution termination
3. Message sent
4. Message received
5 lifeline ______
6 lifeline ______

Answer 14

lifeline creation
lifeline destruction

Question 15

where would you find a message send occurrence ?

Answer 15

look at the tail end of a message
where the tail end touches the lifeline

Question 16

where would you find a message receive occurrence ?

Answer 16

look at the arrow end of a message
where the arrow end touches the lifeline

Question 17

where would you find a lifeline creation event occurrence ?

Answer 17

at the arrow head end of a create event occurrence where there would be a new lifeline

Question 18

where would you find a lifeline destruction event occurrence ?

Answer 18

end of a lifeline with an x
which means the end of a lifelines instance

Question 19

what is the thin green line sitting on top of the lifeline ?

Answer 19

behavior execution

behavior starts executing at the top and bottom of the rectangle the behavior execution comes to an end

Question 20

in an interaction a _________ represents communication between lifelines

Answer 20

message

Question 21

overview of 7 messages found in a sequence diagram

Asynchronous
synchronous
reply
________
________
lost ( uncommon)
found ( uncommon )

Answer 21

create and delete

Question 22

asynchronous messages - solid line with open arrow head which synchronous Messages are solid lines and

Answer 22

filled in arrowhead

Question 23

reply and create message look similar

a create message touches the header of the lifeline

reply (shutdown) message touches both

Answer 23

lifelines

Question 24

similarities of messages

• all messages appear as an arrow
• all messages represent communication
• each message defines two message

Answer 24

occurrences

a message sent - tail end
a messaged received - arrow head

Question 25

T/F message implies that data is being passed in a sequence diagram

Answer 25

False

Question 26

asynchronous message = asynchronous invocation of a ______________ the client who send the message doesn't wait for that message to arrive. Doesn't wait for a reply to be sent back when the behavior comes to an end

Answer 26

behavior

Question 27

difference between operation and reception a reception represents a behavior that can only be invoked asynchronously an operation represents a behavior that can only be invoked asynchronously or synchronously

Answer 27

tying back to sequence diagrams .. when you see a asynchronous message it could correspond to a message of the same name or it could correspond to an operation

Question 28

which model element owns that matching operation or reception 'measure Altitude' ... i.e dig around in the lifeline and see that the block owns that lifeline is mans

Answer 28

Mans has a matching reception with that measure Altitude name

Question 29

Which model element owns that matching behavioral feature ( can either be a reception or operation ) the block that types the lifeline is the

Answer 29

owner

Question 30

a reception has to correspond to a signal that is defined somewhere in the _________. The signals arrival is triggered by the matching reception .

Answer 30

model

Question 31

Why is this answer correct ? arrow solid line = asynchronous invocation also it is the receiving end of the message that is the performer of the message

Answer 31

therefore the block that performs the owning lifeline that owns the behavioral feature "Card inserted"

Question 32

asynchronous message filled in line and open arrowhead synchronous message filled in line and

Answer 32

filled in arrowhead

Question 33

Firethruster is a

Answer 33

synch message

Question 34

Review : Synchronous invocation means the client who invokes the behavior waits for it to finish and waits for control / objects to returned to it In the diagram shown FC send the message and then waits for message to execute .. the performer of the behavior is PS then sends _________________

Answer 34

sends a reply message back to FC telling that the invoked behavior is now complete and can continue on the lifeline .

Question 35

language law : each synchronous message must have a corresponding reply message .. its optional to ___________ if the exams asks you to count the message occurrences you would have to remember the hidden reply messages are implicitly there

Answer 35

display the reply message.

Question 36

how many message occurrences are there in the diagram ?

Answer 36

8

Question 37

T/F a operational can be either sync or async invoked ?

Answer 37

true

Question 38

which model element is the owner of fire thruster its not the lifeline itself .. there is nothing nested in the ps lifeline .. look at what its typed by .. in this case

Answer 38

propulsion subsystem block

Question 39

name of reply messages must ____ name : return value being sent to the client

Answer 39

match

Question 40

why is initialize message violating language law ?

Answer 40

the message is being sent in a "blocked period of time" where FC is waiting for a reply message and synch behavior to be completed

Question 41

Execution specification conveys what in a sequence diagram ?

Answer 41

that a lifeline is executing a behavior for some relative period of time . a asynchronous message arrives and a behavior that the fc lifeline is executing.

Question 42

T/F its optional to show a execution specification

Answer 42

True

Question 43

when there is an overlapping execution specification what does that represent ?

Answer 43

represents a behavior that was invoked by measure altitude concurrently one behavior is executing within the context of another behavior conveys to the reader the period of time and multiple behaviors are executing on a lifeline.

Question 44

event occurrences are found only on

Answer 44

lifelines

Question 45

how many event occurrences are on the fc lifeline ?

Answer 45

7 .. message send and message receive are counted

Question 46

how many event occurrences are on the mansdd lifeline ? #1 message receive for create message #2 lifeline create event occurrence #3 message receive for initialize () #4 behavior execution start #5 message send initialize #6 message receive initialize ( not shown) #7 message send calibrate #8 message receive calibrate ( not shown)

Answer 46

#9 behavior execution end ( terminate) #10 send initialize ready

Question 47

how many event occurrences are on the mans lifeline ? #1 Initialize send #2 behavior execution start #3 behavior execution termination #4 initialize send reply

Answer 47

#5 Calibrate send #6 behavior execution start #7 behavior execution termination #8 Calibrate send reply

Question 48

Traces is an ordered sequence of event occurances if there are 20 event occurrences th there are 20! different traces

Answer 48

event occurrences

Question 49

two criteria for a trace to be valid 1) a message must be sent before it can be received 2) higher before lower on the same ____________

Answer 49

lifeline