/// <summary>
/// Updates a blob if it already exists.
/// If the insert or update lambdas return empty, the blob will be deleted.
/// </summary>
/// <remarks>
/// <para>
/// The provided lambdas can be executed multiple times in case of
/// concurrency-related retrials, so be careful with side-effects
/// (like incrementing a counter in them).
/// </para>
/// <para>This method is idempotent if and only if the provided lambdas are idempotent.</para>
/// </remarks>
/// <returns>The value returned by the lambda, or empty if the blob did not exist or was deleted.</returns>
public static Maybe <T> UpdateBlobIfExistOrDelete <T>(
this IBlobStorageProvider provider, IBlobLocationAndType <T> location, Func <T, Maybe <T> > update, IDataSerializer serializer = null)
{
return(provider.UpdateBlobIfExistOrDelete(location.ContainerName, location.Path, update, serializer));
}