protected void LoadChildren()
{
if (_childrenLoaded)
{
return;
}
ILogger logger = ServiceRegistration.Get <ILogger>();
IPluginManager pluginManager = ServiceRegistration.Get <IPluginManager>();
string itemLocation = Constants.PLUGINTREE_BASELOCATION + Location;
// We'll use a FixedItemStateTracker in the hope that the configuration will be disposed
// after usage. The alternative would be to use a plugin item state tracker which is able to
// remove a config element usage. But this would mean to also expose a listener registration
// to the outside. I think this is not worth the labor.
_childPluginItemStateTracker = new FixedItemStateTracker(string.Format("ConfigurationManager: ConfigurationNode '{0}'", itemLocation));
ICollection <PluginItemMetadata> items = pluginManager.GetAllPluginItemMetadata(itemLocation);
IDictionary <string, object> childSet = new Dictionary <string, object>();
foreach (PluginItemMetadata itemMetadata in items)
{
try
{
ConfigBaseMetadata metadata = pluginManager.RequestPluginItem <ConfigBaseMetadata>(itemMetadata.RegistrationLocation, itemMetadata.Id, _childPluginItemStateTracker);
ConfigBase childObj = Instantiate(metadata, itemMetadata.PluginRuntime);
if (childObj == null)
{
continue;
}
AddChildNode(childObj);
childSet.Add(metadata.Id, null);
}
catch (PluginInvalidStateException e)
{
logger.Warn("Cannot add configuration node for {0}", e, itemMetadata);
}
}
ICollection <string> childLocations = pluginManager.GetAvailableChildLocations(itemLocation);
foreach (string childLocation in childLocations)
{
string childId = RegistryHelper.GetLastPathSegment(childLocation);
if (childSet.ContainsKey(childId))
{
continue;
}
logger.Warn("Configuration: Configuration section '{0}' was found in the tree but not explicitly registered as section (config items in this section are registered by those plugins: {1})",
childLocation, StringUtils.Join(", ", FindPluginRegistrations(childLocation)));
ConfigSectionMetadata dummyMetadata = new ConfigSectionMetadata(childLocation, Constants.INVALID_SECTION_TEXT, null, null);
ConfigSection dummySection = new ConfigSection();
dummySection.SetMetadata(dummyMetadata);
AddChildNode(dummySection);
}
_childrenLoaded = true;
}
/// <summary>
/// Helper method to create a meaningful log message. See usage.
/// </summary>
/// <param name="location">Parent location to search all child locations where plugins registering
/// items to.</param>
/// <returns>List of plugin names registering items under the specified
/// <paramref name="location"/>.</returns>
private static ICollection <string> FindPluginRegistrations(string location)
{
IPluginManager pluginManager = ServiceRegistration.Get <IPluginManager>();
ICollection <PluginItemMetadata> itemRegistrations = pluginManager.GetAllPluginItemMetadata(location);
List <string> result = new List <string>();
foreach (PluginItemMetadata itemRegistration in itemRegistrations)
{
result.Add(itemRegistration.PluginRuntime.Metadata.Name);
}
foreach (string childLocation in pluginManager.GetAvailableChildLocations(location))
{
result.AddRange(FindPluginRegistrations(childLocation));
}
return(result);
}
