public async Task <Metar> GetMetarAsync(string icao, bool invalidateCache)
{
var ret = new Metar();
var cacheHit = this.Cache.Keys.Contains(icao);
if (cacheHit)
{
this.Cache[icao] = ret;
}
else
{
this.Cache.Add(icao, ret);
}
var needDownload = !cacheHit ||
invalidateCache ||
(cacheHit && !this.Cache[icao].IsValid) ||
(cacheHit && this.Cache[icao].TimePublished - DateTime.Now < TimeSpan.FromHours(1));
if (!needDownload)
{
ret = this.Cache[icao];
}
else
{
var retriever = new ENG.WMOCodes.Downloaders.Retrievers.Metar.NoaaGovRetriever();
var result = await Downloader.DownloadAsync(icao, retriever);
if (!result.IsSuccessful)
{
ret.IsValid = false;
ret.MetarObj = null;
}
else
{
var decoder = new ENG.WMOCodes.Decoders.MetarDecoder();
ENG.WMOCodes.Codes.Metar metar = null;
try
{
metar = decoder.Decode(result.Result);
}
catch (ENG.WMOCodes.Decoders.Internal.DecodeException)
{
}
ret.Raw = result.Result;
if (metar == null)
{
ret.IsValid = false;
}
else
{
ret.IsValid = true;
ret.DewPoint = metar.DewPoint;
ret.Temperature = metar.Temperature;
ret.Visibility = (int)metar.Visibility.Distance;
ret.Wind = new Wind();
ret.Wind.IsVariable = metar.Wind.IsVariable;
if (!metar.Wind.IsVariable)
{
ret.Wind.Direction = metar.Wind.Direction.Value;
}
ret.Wind.Speed = metar.Wind.Speed.Value;
var layers = new List <CloudLayer>();
foreach (var cl in metar.Clouds)
{
var layer = new CloudLayer();
layer.Altitude = cl.Altitude * 100;
switch (cl.Type)
{
case ENG.WMOCodes.Types.Cloud.eType.FEW:
layer.Type = CloudLayerType.FEW;
layer.IsCeiling = false;
break;
case ENG.WMOCodes.Types.Cloud.eType.SCT:
layer.Type = CloudLayerType.SCT;
layer.IsCeiling = false;
break;
case ENG.WMOCodes.Types.Cloud.eType.BKN:
layer.Type = CloudLayerType.BKN;
layer.IsCeiling = true;
break;
case ENG.WMOCodes.Types.Cloud.eType.OVC:
layer.Type = CloudLayerType.OVC;
layer.IsCeiling = true;
break;
}
layers.Add(layer);
}
ret.Clouds = layers;
ret.MetarObj = metar;
ret.ComputeFlightRules();
}
}
}
return(ret);
}
public async Task<Metar> GetMetarAsync(string icao, bool invalidateCache)
{
var ret = new Metar();
var cacheHit = this.Cache.Keys.Contains(icao);
if (cacheHit)
{
this.Cache[icao] = ret;
}
else
{
this.Cache.Add(icao, ret);
}
var needDownload = !cacheHit
|| invalidateCache
|| (cacheHit && !this.Cache[icao].IsValid)
|| (cacheHit && this.Cache[icao].TimePublished - DateTime.Now < TimeSpan.FromHours(1));
if (!needDownload)
{
ret = this.Cache[icao];
}
else
{
var retriever = new ENG.WMOCodes.Downloaders.Retrievers.Metar.NoaaGovRetriever();
var result = await Downloader.DownloadAsync(icao, retriever);
if (!result.IsSuccessful)
{
ret.IsValid = false;
ret.MetarObj = null;
}
else
{
var decoder = new ENG.WMOCodes.Decoders.MetarDecoder();
ENG.WMOCodes.Codes.Metar metar = null;
try
{
metar = decoder.Decode(result.Result);
}
catch (ENG.WMOCodes.Decoders.Internal.DecodeException)
{
}
ret.Raw = result.Result;
if (metar == null)
{
ret.IsValid = false;
}
else
{
ret.IsValid = true;
ret.DewPoint = metar.DewPoint;
ret.Temperature = metar.Temperature;
ret.Visibility = (int)metar.Visibility.Distance;
ret.Wind = new Wind();
ret.Wind.IsVariable = metar.Wind.IsVariable;
if (!metar.Wind.IsVariable)
{
ret.Wind.Direction = metar.Wind.Direction.Value;
}
ret.Wind.Speed = metar.Wind.Speed.Value;
var layers = new List<CloudLayer>();
foreach (var cl in metar.Clouds)
{
var layer = new CloudLayer();
layer.Altitude = cl.Altitude * 100;
switch (cl.Type)
{
case ENG.WMOCodes.Types.Cloud.eType.FEW:
layer.Type = CloudLayerType.FEW;
layer.IsCeiling = false;
break;
case ENG.WMOCodes.Types.Cloud.eType.SCT:
layer.Type = CloudLayerType.SCT;
layer.IsCeiling = false;
break;
case ENG.WMOCodes.Types.Cloud.eType.BKN:
layer.Type = CloudLayerType.BKN;
layer.IsCeiling = true;
break;
case ENG.WMOCodes.Types.Cloud.eType.OVC:
layer.Type = CloudLayerType.OVC;
layer.IsCeiling = true;
break;
}
layers.Add(layer);
}
ret.Clouds = layers;
ret.MetarObj = metar;
ret.ComputeFlightRules();
}
}
}
return ret;
}
