/// <summary>
/// Instantiate or Overwrite the Singleton with a copy from a file
/// This chould be called before any components access `Default()`
///
/// DESIGN REVIEW: This method is a race condition with the first access of `Default()`
/// TODO: replace this in-memory collection with a real database
/// </summary>
public static void InitializeFromFile(string fileName)
{
_default = new AlbumCollection(fileName);
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
AlbumCollection.InitializeFromFile("../albums.csv");
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
/// <summary> /// Returns the singleton instance of an AlbumCollection, that may have been pre-loaded /// `InitializeFromFile` /// </summary> public static AlbumCollection Default() => _default ?? (_default = new AlbumCollection(null));