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, null);
ConfigSection dummySection = new ConfigSection();
dummySection.SetMetadata(dummyMetadata);
AddChildNode(dummySection);
}
_childrenLoaded = true;
}
protected ConfigBase Instantiate(ConfigBaseMetadata metadata, PluginRuntime pluginRuntime)
{
ServiceRegistration.Get<ILogger>().Debug("ConfigurationNode: Loading configuration item '{0}'", metadata.Location);
ConfigBase result;
if (metadata.GetType() == typeof(ConfigGroupMetadata))
result = new ConfigGroup();
else if (metadata.GetType() == typeof(ConfigSectionMetadata))
result = new ConfigSection();
else if (metadata.GetType() == typeof(ConfigSettingMetadata))
{
ConfigSettingMetadata csm = (ConfigSettingMetadata) metadata;
try
{
ConfigSetting cs = (ConfigSetting) pluginRuntime.InstantiatePluginObject(csm.ClassName);
if (cs == null)
throw new ArgumentException(string.Format("Configuration class '{0}' not found", csm.ClassName));
cs.Load();
if (csm.ListenTo != null)
foreach (string listenToLocation in csm.ListenTo)
{
IConfigurationNode node;
if (FindNode(listenToLocation, out node))
if (node.ConfigObj is ConfigSetting)
cs.ListenTo((ConfigSetting) node.ConfigObj);
else
ServiceRegistration.Get<ILogger>().Warn("ConfigurationNode '{0}': Trying to listen to setting, but location '{1}' references a {2}",
Location, listenToLocation, node.ConfigObj.GetType().Name);
}
result = cs;
}
catch (Exception ex)
{
ServiceRegistration.Get<ILogger>().Error("Error loading configuration class '{0}'", ex, csm.ClassName);
return null;
}
}
else
throw new NotImplementedException(string.Format("Unknown child class '{0}' of '{1}'", metadata.GetType().FullName, typeof(ConfigBaseMetadata).FullName));
result.SetMetadata(metadata);
return result;
}