private async Task EnsureInitializedAsync()
{
if (_isInitialized)
{
return;
}
await _semaphore.WaitAsync();
try
{
if (_isInitialized)
{
return;
}
var modules = _applicationContext.Application.Modules;
var loadedExtensions = new ConcurrentDictionary <string, ExtensionEntry>();
// Load all extensions in parallel
await modules.ForEachAsync((module) =>
{
if (!module.ModuleInfo.Exists)
{
return(Task.CompletedTask);
}
var manifestInfo = new ManifestInfo(module.ModuleInfo);
var extensionInfo = new ExtensionInfo(module.SubPath, manifestInfo, (mi, ei) =>
{
return(_featuresProvider.GetFeatures(ei, mi));
});
var entry = new ExtensionEntry
{
ExtensionInfo = extensionInfo,
Assembly = module.Assembly,
ExportedTypes = module.Assembly.ExportedTypes
};
loadedExtensions.TryAdd(module.Name, entry);
return(Task.CompletedTask);
});
var loadedFeatures = new Dictionary <string, FeatureEntry>();
// Get all valid types from any extension
var allTypesByExtension = loadedExtensions.SelectMany(extension =>
extension.Value.ExportedTypes.Where(IsComponentType)
.Select(type => new
{
ExtensionEntry = extension.Value,
Type = type
})).ToArray();
var typesByFeature = allTypesByExtension
.GroupBy(typeByExtension => GetSourceFeatureNameForType(
typeByExtension.Type,
typeByExtension.ExtensionEntry.ExtensionInfo.Id))
.ToDictionary(
group => group.Key,
group => group.Select(typesByExtension => typesByExtension.Type).ToArray());
foreach (var loadedExtension in loadedExtensions)
{
var extension = loadedExtension.Value;
foreach (var feature in extension.ExtensionInfo.Features)
{
// Features can have no types
if (typesByFeature.TryGetValue(feature.Id, out var featureTypes))
{
foreach (var type in featureTypes)
{
_typeFeatureProvider.TryAdd(type, feature);
}
}
else
{
featureTypes = Array.Empty <Type>();
}
loadedFeatures.Add(feature.Id, new FeatureEntry(feature, featureTypes));
}
}
;
// Feature infos and entries are ordered by priority and dependencies.
_featureInfos = Order(loadedFeatures.Values.Select(f => f.FeatureInfo));
_features = _featureInfos.ToDictionary(f => f.Id, f => loadedFeatures[f.Id]);
// Extensions are also ordered according to the weight of their first features.
_extensionsInfos = _featureInfos.Where(f => f.Id == f.Extension.Features.First().Id)
.Select(f => f.Extension);
_extensions = _extensionsInfos.ToDictionary(e => e.Id, e => loadedExtensions[e.Id]);
_isInitialized = true;
}
finally
{
_semaphore.Release();
}
}
private void EnsureInitialized()
{
if (_isInitialized)
{
return;
}
lock (InitializationSyncLock)
{
if (_isInitialized)
{
return;
}
var moduleNames = _hostingEnvironment.GetApplication().ModuleNames;
var loadedExtensions = new ConcurrentDictionary <string, ExtensionEntry>();
// Load all extensions in parallel
Parallel.ForEach(moduleNames, new ParallelOptions {
MaxDegreeOfParallelism = 8
}, (name) =>
{
var module = _hostingEnvironment.GetModule(name);
if (!module.ModuleInfo.Exists)
{
return;
}
var manifestInfo = new ManifestInfo(module.ModuleInfo);
var extensionInfo = new ExtensionInfo(module.SubPath, manifestInfo, (mi, ei) => {
return(_featuresProvider.GetFeatures(ei, mi));
});
var entry = new ExtensionEntry
{
ExtensionInfo = extensionInfo,
Assembly = module.Assembly,
ExportedTypes = module.Assembly.ExportedTypes
};
loadedExtensions.TryAdd(module.Name, entry);
});
var loadedFeatures = new Dictionary <string, FeatureEntry>();
// Get all valid types from any extension
var allTypesByExtension = loadedExtensions.SelectMany(extension =>
extension.Value.ExportedTypes.Where(IsComponentType)
.Select(type => new
{
ExtensionEntry = extension.Value,
Type = type
})).ToArray();
var typesByFeature = allTypesByExtension
.GroupBy(typeByExtension => GetSourceFeatureNameForType(
typeByExtension.Type,
typeByExtension.ExtensionEntry.ExtensionInfo.Id))
.ToDictionary(
group => group.Key,
group => group.Select(typesByExtension => typesByExtension.Type).ToArray());
foreach (var loadedExtension in loadedExtensions)
{
var extension = loadedExtension.Value;
foreach (var feature in extension.ExtensionInfo.Features)
{
// Features can have no types
if (typesByFeature.TryGetValue(feature.Id, out var featureTypes))
{
foreach (var type in featureTypes)
{
_typeFeatureProvider.TryAdd(type, feature);
}
}
else
{
featureTypes = Array.Empty <Type>();
}
loadedFeatures.Add(feature.Id, new CompiledFeatureEntry(feature, featureTypes));
}
}
;
// Feature infos and entries are ordered by priority and dependencies.
_featureInfos = Order(loadedFeatures.Values.Select(f => f.FeatureInfo));
_features = _featureInfos.ToDictionary(f => f.Id, f => loadedFeatures[f.Id]);
// Extensions are also ordered according to the weight of their first features.
_extensionsInfos = _featureInfos.Where(f => f.Id == f.Extension.Features.First().Id)
.Select(f => f.Extension);
_extensions = _extensionsInfos.ToDictionary(e => e.Id, e => loadedExtensions[e.Id]);
_isInitialized = true;
}
}