Space Link Extension - Service Management - CCSDS

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DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT 3.4.1.6 Requirements 3.4.1.6.1 Invoker Requirements for Two-Phase Operation Procedures Table 3-28: Invoker Requirements for the Two-Phase Operation Procedures 2PI-0001 The Invoker shall format the operation Invocation and transmit it to the Performer’s message set port in conformance with the Sender Requirements for the SLE-SM Document Exchange Protocol as defined in 3.3.3.1. 2PI-0002 The Invoker shall set the value of the disposition timer using the value of the appropriate two-phase timer parameter for that operation in the referenced Service Agreement: a) If the invocation is urgent, the urgent parameter shall be set to ‘false’ and the disposition timer shall be set to the messageTimestamp of the Invocation plus the value of the urgent timeout parameter for that operation. b) If the invocation is routine, the urgent parameter shall be set to ‘false’ and the disposition timer shall be set to the messageTimestamp of the Invocation plus the value of the routine timeout parameter for that operation. 2PI-0003 The Invoker shall validate returns received from the Performer on the message set port in accordance with the Receiver Requirements for the SLE-SM Document Exchange Protocol as defined in 3.3.3.2. 2PI-0004 The Invoker shall validate exception responses received from the Performer on the exception response port in accordance with the Sender Requirements for the SLE-SM Document Exchange Protocol as defined in 3.3.3.1. 2PI-0005 For each syntactically valid UnrecognizedMessageSetResponse received on the exception response port, the Invoker shall attempt to correlate the content of the UnrecognizedMessageSetResponse with one or more Invocations awaiting disposition. If correlation is successful, the Invoker shall terminate any operation for which an Invocation is contained in a message set for which a validated UnrecognizedMessageSetResponse is received. The Invoker is not required to further interpret or act upon any UnrecognizedMessageSetResponse that cannot be correlated. 2PI-0006 For each syntactically valid InvalidMessageResponse received on the exception response port, the Invoker shall attempt to correlate the content of the InvalidMessageResponse with an Invocation awaiting disposition. If correlation is successful, the Invoker shall terminate the operation for which the Invocation is rejected in the InvalidMessageResponse. The Invoker is not required to further interpret or act upon any InvalidMessageResponse that cannot be correlated. 2PI-0007 The Invoker shall terminate any operation for which a FailedReturn* is received. 2PI-0008 The Invoker shall validate that the invocationMessageSequenceNumber and serviceAgreementRef parameters of a return match the messageSequenceNumber and serviceAgreementRef, respectively, of an Invocation for which the Invoker is awaiting a return, in order to associate a return with an Invocation. NOTE – This is a necessary but not sufficient condition for acceptance of a return for an Invocation. There are additional operation-level matching criteria that must also be met, as specified in the requirements for the specific operations. 2PI-0009 If a SuccessfulReturn or FailedReturn* fails any service management validation requirement specified for its return type, the return shall be deemed to be service management-invalid. The Invoker is not required to further interpret or act upon the service management-invalid return. 2PI-0009 If a validated SuccessfulReturn or FailedReturn* is not received for and associated with the operation by the time the associated disposition timer expires, the Invoker shall contact the Performer to determine the disposition of the operation. CCSDS 910.11-R-2 Page 3-45 March 2008
DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT 3.4.1.6.2 Performer Requirements for Two-Phase Operation Procedures Table 3-29: Performer Requirements for the Two-Phase Operation Procedures 2PP-0101 2PP-0102 2PP-0103 2PP-0104 2PP-0105 The Performer shall receive and validate the operation Invocation in conformance with the Receiver Requirements for the SLE-SM Document Exchange Protocol as defined in 3.3.3.2. If the Invocation passes message set validation as specified in 2PP-0101, the Performer shall: a) initialize a disposition timer based on the value of the messageTimestamp of the operation invocation plus the value of the appropriate two-phase timeout parameter of the referenced Service Agreement (see Note below), where: 1) if the urgent parameter of the Invocation is set to ‘true’, the value of the urgent timeout parameter for that operation shall be used; 2) if the urgent parameter of the Invocation is set to ‘false’, the value of the routine timeout parameter for that operation shall be used; and b) perform operation-specific service management validation on the Invocation: 1) if the Invocation passes service management validation, the Performer shall attempt to perform the operation prior to the expiration of the local disposition timer; 2) if the Invocation fails service management validation, the Performer shall cease interpreting and acting upon the Invocation, generate a FailedReturn*, and transmit the FailedReturn* to the Invoker’s message set port in accordance with the Sender Requirements for the SLE-SM Document Exchange Protocol. NOTE – See 3.4.1.2, Note 1 for further considerations on the setting of the disposition timer. a) If the Performer successfully completes the operation prior to the expiration of the disposition timer, the Performer shall transmit a SuccessfulReturn to the message set port of the Invoker in accordance with the Sender Requirements for the SLE-SM Document Exchange Protocol. b) If the invoked operation cannot be successfully completed or failed for other reasons by the expiration of the disposition timer, the Performer shall terminate the operation and return a FailedReturn* with diagnostic value ‘operation timeout’. The Performer shall validate exception responses received from the Invoker on the exception response port in accordance with the Sender Requirements for the SLE-SM Document Exchange Protocol as defined in 3.3.3.1. For each syntactically valid UnrecognizedMessageSetResponse received on the exception response port, the Performer shall attempt to correlate the content of the UnrecognizedMessageSetResponse with a return that was sent. If correlation is successful, the Performer shall notify the Invoker by other means of the contents of any return that was contained in a message set for which a valid UnrecognizedMessageSetResponse is received. The Invoker is not required to further interpret or act upon any UnrecognizedMessageSetResponse that cannot be correlated. 3.4.2 THREE-PHASE OPERATION PROCEDURE PATTERN 3.4.2.1 Purpose The three-phase operation procedure pattern is used by SLE-SM operations that may require an extended period of time before they can be validated and/or performed. The three-phase operation procedure pattern specifies the messages exchanged between Invoker and Performer associated with a three-phase operation, the activities of the Invoker and Performer in response to those messages, the time constraints under which those CCSDS 910.11-R-2 Page 3-46 March 2008
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Space Link Extension - Service Management - CCSDS

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