public Task ReceiveAsync(IContext context)
{
    switch (context.Message)
    {
        case SuccessResult msg:
            _successResults++;
            CheckForCompletion(msg.Pid);
            break;
        case UnknownResult msg:
            _unknownResults++;
            CheckForCompletion(msg.Pid);
            break;
        case FailedAndInconsistent msg:
            _failedAndInconsistentResults++;
            CheckForCompletion(msg.Pid);
            break;
        case FailedButConsistentResult msg:
            _failedButConsistentResults++;
            CheckForCompletion(msg.Pid);
            break;
            //...
    }