Space Link Extension - Service Management - CCSDS

DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT
Lifeline -
represents a
participant in the
complete
interaction,
indicating either
the source or
destination of a
message
Interaction Frame
“alt” - only one
fragment will
execute based on
the guard of each
fragment.
Additional
interaction frames
include “loop” and
“ref”. A “loop”
frame will
execute multiple
times based on
the conditions
stated in the
associated guard.
Interaction Frame
“ref” - frame
refers to a
previously
defined
sequence, called
“ReturnChange”.
ref
alt
Customer
Message -
represents
communication
between lifelines
e.g. a request
insert money
select drink
[if coffee selected]
dispense cup of coffee
[if tea selected]
dispense cup of tea
ReturnChange (selected drink, amount of money inserted)
Vending machine
brew coffee
brew tea
Guard - states a
condition for the
sequence
included in the
relevant frame or
fragment to
execute
Return message -
a message that is
associated with a
transaction that
started with an
initial message
This frame defines a parameterized
and re-usable sequence. The
name of the sequence is
“ReturnChange” and has two
parameters.
Parameters of this re-usable
sequence. drink and money are
variables that will determine what is
return as change.
sd ReturnChange (drink, money)
Customer
Vending machine
alt
[if money inserted is more than drink cost]
return change
calculate change amount
“transaction complete”
[else]
“transaction complete”
Figure E-5: Sequence Diagram Example
CCSDS 910.11-R-2 Page E-6 March 2008