This code defines an asynchronous method that performs a series...

January 2, 2025 at 01:28 PM

public async Task<GetAvailabilityResponse> Handle(GetAvailabilityRequest request, CancellationToken cancellationToken)
{
    _logger.LogAvailabilityCheckStarted();

    var getCvakStateResponse = await RetryCallingMethodService.RetryOnException(
          () => _cvakCustomerApiService.GetCvakState(request.AltamiraId, cancellationToken),
          ex => _logger.LogGetAvailabilityError(ex));

    if (getCvakStateResponse.IsEnabled is null)
    {
        _logger.LogFirstCvakProcess();
        await RetryCallingMethodService.RetryOnException(
        () => _cvakCustomerApiService.SetDefaultCvakState(request.AltamiraId, cancellationToken),
        ex => _logger.LogSetDefaultCvakStateError(ex));

        _logger.LogAvailabilityCheckFinished();

        return CreateAvailabilityResponse(AvailabilityStatus.Available);
    }

    _logger.LogAvailabilityValue(getCvakStateResponse.IsEnabled.Value ? "Enabled" : "Disabled");
    _logger.LogAvailabilityCheckFinished();

    return CreateAvailabilityResponse(getCvakStateResponse.IsEnabled.Value ? AvailabilityStatus.Available : AvailabilityStatus.Disabled);
}

This code defines an asynchronous method that performs a series of tasks aimed at handling an "availability check" process. Here's a step-by-step explanation of what it does:

Log the Start of the Availability Check:
- The method starts by logging that the availability check has begun using _logger.LogAvailabilityCheckStarted().
Call External API to Get State:
- It attempts to retrieve a state (getCvakStateResponse) by calling _cvakCustomerApiService.GetCvakState, which takes an identifier (AltamiraId) and a CancellationToken as parameters.
- This operation is wrapped in a retry mechanism, using RetryCallingMethodService.RetryOnException. If an exception occurs during the call, it retries and logs the error using _logger.LogGetAvailabilityError.
Check the Retrieved State:
- Once the state is retrieved, it checks if getCvakStateResponse.IsEnabled is null:
  - If it is null, it logs the need for resetting the state (_logger.LogFirstCvakProcess()).
  - Then, it attempts to set a default state by calling _cvakCustomerApiService.SetDefaultCvakState, wrapped in the same retry mechanism. Any errors encountered during this call are logged with _logger.LogSetDefaultCvakStateError.
  - Finally, it logs that the availability check is finished and returns a response indicating the availability status as Available (via CreateAvailabilityResponse).
Handle Non-null State:
- If getCvakStateResponse.IsEnabled is not null, it determines whether the state is "Enabled" or "Disabled":
  - It logs the corresponding state value (Enabled or Disabled) using _logger.LogAvailabilityValue.
  - It logs the completion of the availability check (_logger.LogAvailabilityCheckFinished).
Return Availability Status:
- Depending on the resolved state (getCvakStateResponse.IsEnabled.Value), the method returns an availability response (CreateAvailabilityResponse) set to either Available or Disabled.

Purpose:

The method is responsible for:

Checking the availability status of a specific entity identified by AltamiraId.
Ensuring a valid state exists by setting a default state when necessary.
Logging all significant steps and handling retries in case of errors during external API calls.

The use of logging and retries suggests robustness against transient issues in the external API (_cvakCustomerApiService) while maintaining traceability of the process.

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