/// <summary>
/// Beginnt mit dem Laden von Quellinformationen.
/// </summary>
/// <param name="source">Die gewünschte Quelle.</param>
/// <returns>Die Hintergrundaufgabe zum Laden der Quellinformationen.</returns>
CancellableTask <SourceInformation> IDevice.GetSourceInformationAsync(SourceSelection source)
{
Assert.IsNotNull(m_currentSourceGroup, "not allocated");
// Make it async
return(CancellableTask <SourceInformation> .Run(cancel => m_currentSourceGroup.Contains( source )?new SourceInformation { Source = source.Source } : null));
}
/// <summary>
/// Aktiviert den Empfang einer Quellgruppe.
/// </summary>
/// <param name="source">Eine Quelle der Gruppe.</param>
/// <returns>Die Hintergrundaufgabe zur Aktivierung.</returns>
CancellableTask <SourceSelection[]> IDevice.Activate(SourceSelection source)
{
// Find the source map
var group = m_provider.AllAvailableSources.SingleOrDefault(g => g.Contains(source));
Assert.IsNotNull(group, "no such source");
m_currentSourceGroup = new HashSet <SourceSelection>();
// Report
return(CancellableTask <SourceSelection[]> .Run(cancel => (m_currentSourceGroup = group).ToArray()));
}
/// <summary>
/// Wählt eine Quellgruppe an.
/// </summary>
/// <param name="source">Eine der Quellen der Gruppe.</param>
/// <returns>Die Liste aller Quellen der Gruppe.</returns>
public CancellableTask <SourceSelection[]> Activate(SourceSelection source)
{
// Map to indicated device
var localSource = m_profile.FindSource(source.Source).FirstOrDefault();
if (localSource == null)
{
throw new ArgumentException("bad source", "source");
}
// Create task
return
(CancellableTask <SourceSelection[]> .Run(cancel =>
{
// Check for cancel
if (cancel.IsCancellationRequested)
{
return _NoSources;
}
// Start the hardware on first call - this may take some time
var device = localSource.GetHardware();
// Check for cancel
if (cancel.IsCancellationRequested)
{
return _NoSources;
}
// Select the group - again this may last a bit
localSource.SelectGroup(device);
// Check for cancel
if (cancel.IsCancellationRequested)
{
return _NoSources;
}
// Validate
var groupReader = device.GroupReader;
if (groupReader == null)
{
return _NoSources;
}
if (!groupReader.CancellableWait(cancel))
{
return _NoSources;
}
// Load the map
var groupInformation = groupReader.Result;
if (groupInformation == null)
{
return _NoSources;
}
// Use profile to map to full source information
return
groupInformation
.Sources
.Select(s => m_profile.FindSource(s).FirstOrDefault())
.Where(s => s != null)
.ToArray();
}));
}