Space Link Extension - Service Management - CCSDS

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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. <strong>CCSDS</strong> 910.11-R-2 Page 3-41 March 2008
DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT state machine op_I Two Phase Operation Invoker Invoked op_SR / success op_FR / failed exception response / failed timeout / contact performer by other means Figure 3-18: State Diagram for Two-Phase Operation Pattern—Invoker View state machine Two Phase Operation Performer op_I Validating and Performing [performed] / op_SR [not performed] / op_FR Figure 3-19: State Diagram for Two-Phase Operation Pattern—Performer View Table 3-26: State Table for Two-Phase Operation—Invoker View State Initial Invoked Event op-I sent -> Invoked - op-SR - -> Final op-FR - FAIL -> Final Exception response - FAIL -> Final Timeout - Contact performer -> Final <strong>CCSDS</strong> 910.11-R-2 Page 3-42 March 2008
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Draft Recommendation for Space Data
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DRAFT RECOMMENDED STANDARD FOR SPAC
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CCSDS 910.11-R-2 Page 2-5 March 200
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Space Link Extension - Service Management - CCSDS

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