using System;
using System.Threading;
using System.Threading.Tasks;

namespace LeanCloud.Storage.Internal {
  public interface IInstallationIdController {
    /// <summary>
    /// Sets current <code>installationId</code> and saves it to local storage.
    /// </summary>
    /// <param name="installationId">The <code>installationId</code> to be saved.</param>
    Task SetAsync(Guid? installationId);

    /// <summary>
    /// Gets current <code>installationId</code> from local storage. Generates a none exists.
    /// </summary>
    /// <returns>Current <code>installationId</code>.</returns>
    Task<Guid?> GetAsync();

    /// <summary>
    /// Clears current installationId from memory and local storage.
    /// </summary>
    Task ClearAsync();
  }
}