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  1. SAFe Program
  2. SP-1628

TANGO Base Class Subarray implements long running commands that trigger observing state transitions

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      In many cases, observing state transitions, such as AssignResources(),  Configure(), and Scan(), cannot be executed instantaneously.  The TMC Subarray and leaf nodes, as well as the sub-system Subarrays and other software components coordinating observing state transitions of other components/devices, forward the received command to other components/devices and have to wait for those subordinate components to complete command execution and perform state transition, before they can perform the state transition themselves; therefore,  the commands that trigger sub-array observing state transitions must be implemented as non-blocking. Even in a simulated environment, where all M&C software runs on the same cluster, blocking command calls result in failures. 

      SKA Base Class ObsDevice is used as a base for many other components which will  inherit this implementation.  In addition, SKA Base Class ObsDevice may be used as a reference implementation  for developing components not derived from the SKA Base Class ObsDevice.

      Show
      In many cases, observing state transitions, such as AssignResources(),  Configure(), and Scan(), cannot be executed instantaneously.  The TMC Subarray and leaf nodes, as well as the sub-system Subarrays and other software components coordinating observing state transitions of other components/devices, forward the received command to other components/devices and have to wait for those subordinate components to complete command execution and perform state transition, before they can perform the state transition themselves; therefore,  the commands that trigger sub-array observing state transitions must be implemented as non-blocking. Even in a simulated environment, where all M&C software runs on the same cluster, blocking command calls result in failures.  SKA Base Class ObsDevice is used as a base for many other components which will  inherit this implementation.  In addition, SKA Base Class ObsDevice may be used as a reference implementation  for developing components not derived from the SKA Base Class ObsDevice.
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      All commands that trigger observingState transitions implemented as long running commands (need to add list here).

      A set of attributes to report the status of the command execution implemented (see description).

       

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      All commands that trigger observingState transitions implemented as long running commands (need to add list here). A set of attributes to report the status of the command execution implemented (see description).  
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    • Team_KAROO
    • Sprint 4
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      SKASubarray device implements commands that are used for subarray state as asynchronous (long running) commands.

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      SKASubarray device implements commands that are used for subarray state as asynchronous (long running) commands.
    • 12.6
    • Stories Completed, Integrated, Solution Intent Updated, Outcomes Reviewed, Demonstrated, Satisfies Acceptance Criteria, Accepted by FO

    • PI22 - UNCOVERED

    • Cross_Team_Code_Review SS-54 Team_MCCS mccs_software

    Description

      The goal is to implement commands: AssignResources(), Configure(), Scan(), etc. as long running commands, meaning that the caller does not get blocked waiting for a command to be executed.  The control should be returned to the caller within few milliseconds. The progress of the execution of the command is tracked by additional attributes, and the completion of the command reported as a state transition (event).

      Detailed design for each command is still in progress (state transitions and command sequencing).

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          Enabler - An Enabler supports the activities needed to extend the Architectural Runway to provide future business functionality. These include exploration, architecture, infrastructure, and compliance. SS-54 Review of Control Systems guidelines and refactoring of implementation

          • Not Assigned - Priority is not assigned yet.
          • Implementing
          depends on

          Enabler - An Enabler supports the activities needed to extend the Architectural Runway to provide future business functionality. These include exploration, architecture, infrastructure, and compliance. SP-1640 Reference design and implementation for asynchronous (long-running) commands

          • Must have - Items labelled as "Must have" are critical to the current delivery timebox in order for it to be a success.
          • Done

          Enabler - An Enabler supports the activities needed to extend the Architectural Runway to provide future business functionality. These include exploration, architecture, infrastructure, and compliance. SP-1827 Update TANGO Base Classes to handle long running commands

          • Must have - Items labelled as "Must have" are critical to the current delivery timebox in order for it to be a success.
          • Done

          Feature - A Feature is a service that fulfills a stakeholder need. Each feature includes a benefit hypothesis and acceptance criteria, and is sized or split as necessary to be delivered by a single Agile Release Train (ART) in a Program Increment (PI). SP-1984 MCCS adoption of long running command implementation in the tango_base_classes

          • Must have - Items labelled as "Must have" are critical to the current delivery timebox in order for it to be a success.
          • Done
          informs

          Architectural Decision - Software Architectural Decision ADR-47 Guidelines for implementation of commands

          • decided
          is required by

          Feature - A Feature is a service that fulfills a stakeholder need. Each feature includes a benefit hypothesis and acceptance criteria, and is sized or split as necessary to be delivered by a single Agile Release Train (ART) in a Program Increment (PI). SP-2077 Refactor and release long running command implementation in ska-tango-base

          • Must have - Items labelled as "Must have" are critical to the current delivery timebox in order for it to be a success.
          • Done

          Enabler - An Enabler supports the activities needed to extend the Architectural Runway to provide future business functionality. These include exploration, architecture, infrastructure, and compliance. SP-1629 SKA Base Class ObsDevice - abort command execution

          • Won't have (this time) - Items labelled as "Won't have", have been agreed by stakeholders as the least-critical, lowest-payback items, or not appropriate at that time. As a result, "Won't have" items are not planned into the schedule for the next delivery timebox.
          • Discarded
          relates to

          Spike - A time limited investigation to get some knowledge SP-1794 TMC asynchronous communication

          • Could have - Items labelled as "Could have" are desirable but not necessary and could improve the user experience or customer satisfaction for a little development cost. These will typically be included if time and resources permit.
          • Done
          mentioned in

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                s.vrcic Vrcic, Sonja
                s.vrcic Vrcic, Sonja
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                  Feature Estimate: 1.0

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