/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIPrincipal;

/**
 * Methods specific to LocalStorage, see nsIDOMStorageManager for methods shared
 * with SessionStorage.  Methods may migrate there as SessionStorage is
 * overhauled.
 */
[scriptable, builtinclass, uuid(d4f534da-2744-4db3-8774-8b187c64ade9)]
interface nsILocalStorageManager : nsISupports
{
  readonly attribute boolean nextGenLocalStorageEnabled;

  /**
   * Trigger preload of LocalStorage for the given principal.  For use by
   * ContentParent::AboutToLoadDocumentForChild to maximize the amount of time
   * we have to load the data off disk before the page might attempt to touch
   * LocalStorage.
   *
   * This method will not create a QuotaManager-managed directory on disk if
   * one does not already exist for the principal.
   */
  [implicit_jscontext]
  Promise preload(in nsIPrincipal aPrincipal);

  [implicit_jscontext]
  Promise isPreloaded(in nsIPrincipal aPrincipal);

  [implicit_jscontext]
  Promise getState(in nsIPrincipal aPrincipal);
};