/// <summary>Returns the ExtendedConfiguration for the time specifed or null if time is before first timestamp in configuration database</summary>
/// <param name="utcTime">UTC time to fetch the configuration for or DateTime.MaxValue for latest timestamp </param>
/// <returns>ExtendedConfiguration object or null</returns>
public ExtendedConfiguration GetConfiguration(DateTime utcTime)
{
using (FetchConfigurationDataClassesDataContext db = new FetchConfigurationDataClassesDataContext(connectionString))
{
if (utcTime == DateTime.MaxValue)
{
utcTime = (DateTime)db.GetLatestTimeStamp().First().TimeStamp;
}
else if (utcTime < db.GetFirstTimeStamp().First().TimeStamp)
{
return(null);
}
List <ExtendedDataSourceDefinition> dataSourcesList = new List <ExtendedDataSourceDefinition>();
Dictionary <string, VariableDefinition> supportedVars = new Dictionary <string, VariableDefinition>();
var dataSources = db.GetDataSources(utcTime);
var dsVariables = db.GetEnvVariables().ToArray();
foreach (var ds in dataSources)
{
var mapping = db.GetMapping(utcTime, ds.Name).ToArray();
var providedVars = mapping.Where(mp => mp.IsOutbound != null && (bool)mp.IsOutbound).Select(mp => mp.FetchVariableName).ToArray();
ExtendedDataSourceDefinition dsd = new ExtendedDataSourceDefinition((ushort)ds.ID, ds.Name, ds.Description, ds.Copyright, ds.Uri, ds.FullClrTypeName, providedVars,
(ds.RemoteName != null) ? ds.Uri : string.Empty,
mapping.ToDictionary(map => map.FetchVariableName, map => map.DataVariableName),
ds.RemoteName,
(ushort)(ds.RemoteID == null ? -1 : ds.RemoteID));
dataSourcesList.Add(dsd);
foreach (var envVar in providedVars)
{
if (!supportedVars.ContainsKey(envVar))
{
var v = dsVariables.Where(dsv => dsv.DisplayName == envVar).First();
supportedVars[envVar] = new VariableDefinition(v.DisplayName, v.Units, v.Description);
}
}
}
return(new ExtendedConfiguration(utcTime, dataSourcesList.ToArray(), supportedVars.Values.ToArray())
{
FetchEngineTypeName = db.GetFetchEngine(utcTime).First().FullClrTypeName
});
}
}
/// <summary>
/// Process the request with a local data source specified by its definition
/// </summary>
/// <param name="request">A request to process</param>
/// <param name="dataSource">A data source definition to process the request with</param>
/// <returns></returns>
private async Task <IFetchResponseWithProvenance> ProcessWithLocalDataSourceAsync(IFetchRequest request, ExtendedDataSourceDefinition dataSource)
{
if (dataSource.IsFederated)
{
throw new InvalidOperationException("Expected local data source definition, while passed definition is federated data source");
}
var instance = await DataSourceHandlerCache.GetInstanceAsync(dataSource.HandlerTypeName, dataSource.Uri);
StandaloneRequestContext ctx = new StandaloneRequestContext(
TranslateRequestIntoDsNamings(request, dataSource),
this,
dataSource.DsToEnvMapping,
instance.Storage,
dataSource.ID);
var values = await instance.Handler.ProcessRequestAsync(ctx);
var uncertainty = ctx.ReportUncertainty();
if (uncertainty == null)
{
uncertainty = ArrayHelper.GetConstantArray <double>(request.Domain.GetDataArrayShape(), Double.MaxValue);
}
return(new FetchResponseWithProvenance(request, values, uncertainty,
ArrayHelper.GetConstantArray <ushort>(request.Domain.GetDataArrayShape(), dataSource.ID)));
}
/// <summary>
/// Process the request with federated data source specified by its definition
/// </summary>
/// <param name="request">A request to process</param>
/// <param name="ds">A data source definition to process the request with</param>
/// <returns></returns>
private async Task <IFetchResponseWithProvenance> ProcessWithFederatedDataSourceAsync(IFetchRequest request, ExtendedDataSourceDefinition ds)
{
if (!ds.IsFederated)
{
throw new InvalidOperationException("Expected federated data source definition, while passed definition is local data source");
}
var res = await PerformRemoteRequestAsync(ds.Uri, new FetchRequest(
ds.EnvToDsMapping[request.EnvironmentVariableName], //using remove env names
request.Domain,
request.ReproducibilityTimestamp,
new string[] { ds.RemoteDataSourceName } //using remote ds name
));
return(new FetchResponseWithProvenance(request,// note here, that we don't convert env var names back, we simply take the initial request and append it with the result arrays
res.Values,
res.Uncertainty,
ArrayHelper.GetConstantArray <ushort>(request.Domain.GetDataArrayShape(), ds.ID)));
}
/// <summary>
/// Process the request with a data source specified by its definition
/// </summary>
/// <param name="request">A request to process</param>
/// <param name="dataSource">A data source definition to process the request with</param>
/// <returns></returns>
private async Task <IFetchResponseWithProvenance> ProcessWithDataSourceAsync(IFetchRequest request, ExtendedDataSourceDefinition dataSource)
{
traceSource.TraceEvent(TraceEventType.Information, 7, string.Format("One data source {0} serves the request", dataSource.Name));
if (!dataSource.IsFederated) //local
{
return(await ProcessWithLocalDataSourceAsync(request, dataSource));
}
else //federated
{
return(await ProcessWithFederatedDataSourceAsync(request, dataSource));
}
}
private static IFetchRequest TranslateRequestIntoDsNamings(IFetchRequest request, ExtendedDataSourceDefinition dataSource)
{
string dsName;
if (dataSource.EnvToDsMapping.TryGetValue(request.EnvironmentVariableName, out dsName))
{
return(new FetchRequest(dsName, request.Domain, request.ReproducibilityTimestamp, request.ParticularDataSource));
}
else
{
return(request);
}
}