New Session Counters

ChargingInstance chargingInstance = getCaller().getChargingManager()
               .getChargingInstance(B2BUAChargingFeatureUtil.DEFAULT_ECUR_CHARGING_INSTANCE);
SessionCounters sessionCounters = chargingInstance.getSessionCounters();

Create a list of session counters which have pendingRequested units
Create a list MSCCs with Granted-Service-Units from the CCA

// Handle the common case where there is a single MSCC/GSU and single session counter expecting granted units
IF there is one and only one MSCC
   AND one session counter awaiting granted units
   AND MSCC GSU unit type is an address key of session counter THEN

    Perform GSU updates to the session counter using values from MSCC

    RETURN
ENDIF


// Exact matching cases
FOREACH MSCC DO

    Create a session counter address for the MSCC based on configured ordered list of AVPs to consider (e.g. [Unit-Type, Service-Id, Rating-Group, Custom-Attribute]

    Get session counter from charging instance using session counter address calculated from the MSCC

    IF a session counter exists for the MSCC address THEN

        Perform GSU updates to the session counter using values from MSCC

        Mark MSCC processed

        CONTINUE
    ENDIF

DONE

// Best effort matching
FOREACH unmatched MSCC DO

    Create a session counter address from the MSCC using the configured ordered list of AVPs to
    consider (e.g. [Service-Id, Rating-Group, Unit-Type, Custom-Attribute])

    Create a list of addresses based on the configured ordered list of AVPs with first address
    including all then removing the last AVP until only first address left i.e.
    [[Unit-Type, Service-Id, Rating-Group, Custom-Attribute],
     [Unit-Type, Service-Id, Rating-Group],
     [Unit-Type, Service-Id],
     [Unit-Type]]

    FOREACH address DO
        Get matching session counters

        IF there is a matching session counter THEN

            Perform GSU updates to the first session counter

            Mark MSCC processed

            CONTINUE
        ENDIF
    DONE
DONE

// Record values from any unmatched MSCCs
FOREACH unmatched MSCC DO

    Create a new session counter using the full MSCC session counter address if it does not already exist.

    Perform GSU updates to the session counter using values from MSCC.  Surplus units for an existing
    counter will be applied to the counter at this point.
DONE

IF CCR-U or CCR-T with USU sent THEN
    Update cummulativeSentUsed for the counter matching the MSCC
ENDIF

Update cummulativeCommittedUsed values for all USU sent in the CCR