Space Link Extension - Service Management - CCSDS

DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT
TwoPhaseOperationProcedurePattern {invoker, performer, Invocation,
SuccessfulReturn, FailedReturn*}
invoker
performer
ref
Send Message (Invocation, invoker, performer)
alt
ref
[if operation is successful]
Send Message (SuccessfulReturn, performer, invoker)
[else]
ref
Send Message (FailedReturn*, performer, invoker)
FailedReturn* designates either a FailedReturn or FailedReturnWithDenial, as appropriate to the
specific operation.
Figure 3-17: Sequence Diagram for Two-Phase Operation Pattern
3.4.1.4 State Machines
Figures 3-18 and 3-19 are the state diagrams for the two-phase operation procedure pattern
from the points of view of the operation Invoker and Performer respectively. Tables 3-26
and 3-27 are the corresponding state tables.
Note that only SLE-SM messages which have already passed validation at the level of the
Document Exchange Protocol (syntactical, authentication, invocation sequence (if
applicable), and supported-operation) enter into the state machine for an Operation Procedure
Pattern. In addition, responses must be correlated with preceding messages (by sequence
number) in order to be associated to any operation and enter into the state machine; if not
correlated, they are discarded.
CCSDS 910.11-R-2 Page 3-41 March 2008