.. _releaselow:

======================
ReleaseAllResources
======================

1. The subarray Node provides API for **ReleaseAllResources** workflow.
2. The Sub-array node **accepts the command** if :-

    A. Admin mode reported by each of the system - CSP,SDP subarray are in **ONLINE/ENGINEERING/RESERVED**
    B. Operational state of the Sub-array node is **ON/OFF/INIT/STANDBY/ALARM**

3. The Sub-array Node **rejects the command** if :-

    A. Admin mode reported by each of the system - CSP,SDP Sub-array are in **OFFLINE** or **NOT FITTED**.
    B. Operational state of central node is **FAULT/UNKNOWN/DISABLE** .

4. The following state requirements are applied for the command execution :-

    A. TMC Subarray is in `'observation state'` **EMPTY** or **IDLE** .
    B. :term:`isSubarrayAvailable` is checked to ensure the subsystems (CSP, SDP and MCCS) are :term:`available`

5. The command execution involves below key operations :-
    A. Only for MCCS interface is added in input Json .For CSP and SDP , no JSON is sent to leaf nodes.
    B. The command is then invoked on the relevant TMC CSP, SDP, MCCS leaf Nodes.

        * If leaf node rejects release resources command , command failure is reported as **'RESULT_CODE - FAILED'** on Long Running Command Result attribute of the TMC Subarry node.Command will not be sent to remaining subsystems in this case if multiple subsystems are involved .
        * If all leaf node accept command , the TMC Subarry node will wait for command completion.

6. The Sub-array node monitors the progress of command via the Sub-array node ObsState transitions and the long running command results.

    A. Command is successful when the TMC Subarray Node transitions to **EMPTY** ObsState. This is reported as **'RESULT_CODE - OK'** on Long Running Command Result attribute of the Subarray node.
    B. Command failure is reported in any of the below cases as **'RESULT_CODE - FAILED'** on Long Running Command Result attribute of the Subarray node.

        * The CSP Leaf node/SDP Leaf node/MCCS Leaf node reports **'RESULT_CODE - FAILED'** on its Long Running Command Result attribute
        * The command times out if TMC SubarrayNode does not transition to **EMPTY** within the timeout period specified by `CommandTimeOutDefault` property specified in helm chart of the TMC Subarray node .

7. On success the system is ready for fresh observation; on failure it may revert to **IDLE** or **FAULT** depending on severity.
8. When all targeted subsystems report successful completion, cleanup on the TMC subarry node proceeds.Stored science block ID, subarray ID, and internal resource caches are cleared. Assigned resources attribute is reset.