public static IEnumerable <IResource> GetOrAddResources(this IResourceCache resourceCache, ResourceType resourceType, Func <IEnumerable <IResource> > findResources)
{
IEnumerable <IResource> resources;
if (resourceCache.TryGetResources(resourceType, out resources))
{
return(resources);
}
resources = findResources();
if (resources != null)
{
resourceCache.StoreResources(resourceType, resources);
}
return(resources);
}