bool ActivateFeature(FeatureInfo featureInfo, List <FeatureInfo> featuresToActivate, FeatureConfigurationContext featureConfigurationContext)
{
if (featureInfo.Feature.IsActive)
{
return(true);
}
Func <List <string>, bool> dependencyActivator = dependencies =>
{
var dependentFeaturesToActivate = new List <FeatureInfo>();
foreach (var dependency in dependencies.Select(dependencyName => featuresToActivate
.SingleOrDefault(f => f.Feature.Name == dependencyName))
.Where(dependency => dependency != null))
{
dependentFeaturesToActivate.Add(dependency);
}
return(dependentFeaturesToActivate.Aggregate(false, (current, f) => current | ActivateFeature(f, featuresToActivate, featureConfigurationContext)));
};
var featureType = featureInfo.Feature.GetType();
if (featureInfo.Feature.Dependencies.All(dependencyActivator))
{
featureInfo.Diagnostics.DependenciesAreMet = true;
if (!HasAllPrerequisitesSatisfied(featureInfo.Feature, featureInfo.Diagnostics, featureConfigurationContext))
{
settings.MarkFeatureAsDeactivated(featureType);
return(false);
}
settings.MarkFeatureAsActive(featureType);
featureInfo.InitializeFrom(featureConfigurationContext);
// because we reuse the context the task controller list needs to be cleared.
featureConfigurationContext.TaskControllers.Clear();
return(true);
}
settings.MarkFeatureAsDeactivated(featureType);
featureInfo.Diagnostics.DependenciesAreMet = false;
return(false);
}
