/// <summary>
/// Registers or refreshes the entry for the key passed across.
/// </summary>
/// <param name="key">The key to register. This must be usable within a dictionary.</param>
/// <param name="aircraft">The aircraft to associate with the key, if any. Pass null if the aircraft is unknown.</param>
/// <returns></returns>
protected virtual TDetail DoRegisterAircraft(TKey key, IAircraft aircraft)
{
TDetail result = null;
Initialise();
lock (_QueueLock) {
FetchedDetail fetchedDetail;
if (!_FetchedDetailMap.TryGetValue(key, out fetchedDetail))
{
if (!_LookupQueue.TryGetValue(key, out fetchedDetail))
{
fetchedDetail = new FetchedDetail()
{
Aircraft = aircraft,
Key = key,
};
_LookupQueue.Add(key, fetchedDetail);
}
}
fetchedDetail.LastRegisteredUtc = _Clock.UtcNow;
result = fetchedDetail.Detail;
}
return(result);
}
/// <summary>
/// Fetches the aircraft's details.
/// </summary>
/// <param name="fetchedDetail"></param>
private void FetchAircraft(FetchedDetail fetchedDetail)
{
lock (_FetchLock) {
var isFirstFetch = fetchedDetail.LastCheckedUtc == default(DateTime);
fetchedDetail.LastCheckedUtc = _Clock.UtcNow;
fetchedDetail.Detail = DoFetchAircraft(fetchedDetail);
}
}
/// <summary> /// Fetches the detail for the aircraft, raising any events necessary when a change has been detected. /// </summary> /// <param name="fetchedDetail"></param> /// <returns></returns> protected abstract TDetail DoFetchAircraft(FetchedDetail fetchedDetail);
