private MarkerResource(MarkerResource markerResource)
{
Source = markerResource.Source;
Format = markerResource.Format;
PollingInterval = markerResource.PollingInterval;
}
private MarkerResource(MarkerResource markerResource)
{
Source = markerResource.Source;
Format = markerResource.Format;
PollingInterval = markerResource.PollingInterval;
}
/// <summary>
/// Selects an IMarkerProvider plugin that supports the type of specified Marker.
/// </summary>
/// <remarks>
/// The MarkerResource passed to this method is used to determine which type of MarkerProvider to return.
/// If more than one plugin supports the MarkerResource (based on the required capabilities in its attributes), the first plugin found that matches the requirements in used.
/// If more than one plugin matches the requirements, a plugin already instantiated will take precedence over other plugins.
/// </remarks>
/// <returns>
/// An IMarkerProvider that supports the type of marker passed as a parameter.
/// </returns>
protected virtual IMarkerProvider SelectMarkerProvider(MarkerResource markerResource)
{
IEnumerable<LooseMetadataLazy<IMarkerProvider, IMarkerProviderMetadata>> results = PluginsManager.
MarkerProviderPlugins
.Where(
i =>
(i.Metadata.SupportedFormat == markerResource.Format)
&& (i.Metadata.SupportsPolling || !markerResource.PollingInterval.HasValue));
//Favor Plugins that have already been instantiated
LooseMetadataLazy<IMarkerProvider, IMarkerProviderMetadata> result = results.Any(i => i.IsValueCreated)
? results.First(
i => i.IsValueCreated)
: results.FirstOrDefault();
return result != null ? result.Value : null;
}
protected virtual IMarkerProvider SelectMarkerProvider(MarkerResource markerResource)
{
var results = new List<LooseMetadataLazy<IMarkerProvider, IMarkerProviderMetadata>>();
foreach (var markerProviderPlugin in PluginsManager.MarkerProviderPlugins)
{
if (markerProviderPlugin.LooseMetadata.ContainsKeyIgnoreCase("supportedformat")
&& markerProviderPlugin.LooseMetadata.GetEntryIgnoreCase("supportedformat").Equals(markerResource.Format))
{
bool supportsPolling;
if (!markerResource.PollingInterval.HasValue ||
(markerProviderPlugin.LooseMetadata.ContainsKeyIgnoreCase("supportspolling")
&& bool.TryParse(markerProviderPlugin.LooseMetadata.GetEntryIgnoreCase("supportspolling").ToString(), out supportsPolling)
&& supportsPolling))
{
results.Add(markerProviderPlugin);
}
}
}
//Favor Plugins that have already been instantiated
LooseMetadataLazy<IMarkerProvider, IMarkerProviderMetadata> result = results.Any(i => i.IsValueCreated)
? results.First(
i => i.IsValueCreated)
: results.FirstOrDefault();
return result != null ? result.Value : null;
}
private IMarkerProvider InitializeMarkerProvider(MarkerResource resource)
{
var markerProvider = SelectMarkerProvider(resource);
if (markerProvider != null)
{
markerProvider.Source = resource.Source;
markerProvider.PollingInterval = resource.PollingInterval;
}
else
{
SendLogEntry(KnownLogEntryTypes.UnableToLocateMarkerProvider, LogLevel.Warning,
SilverlightMediaFrameworkResources.UnableToLocateMarkerProviderLogMessage);
}
return markerProvider;
}
