author David Anderson <>
Fri, 25 Mar 2016 01:35:07 -0700
changeset 324104 3c3cb171a6ccc6dbda66bf513b0d33e131d6cfea
parent 275452 ad01543457e739b4eee7a245e16734a3ecfd10ad
permissions -rw-r--r--
Track whether or not remote layers have acknowledged compositor changes. (bug 1256517 part 1, r=mattwoodrow, a=rkothari)

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */

#include "nsISupports.idl"

interface mozIStorageConnection;
interface mozIStorageValueArray;
interface nsIArray;
interface nsIVariant;

 * mozIStorageAggregateFunction represents aggregate SQL function.
 * Common examples of aggregate functions are SUM() and COUNT().
 * An aggregate function calculates one result for a given set of data, where
 * a set of data is a group of tuples. There can be one group
 * per request or many of them, if GROUP BY clause is used or not.
[scriptable, uuid(763217b7-3123-11da-918d-000347412e16)]
interface mozIStorageAggregateFunction : nsISupports {
   * onStep is called when next value should be passed to
   * a custom function.
   * @param aFunctionArguments    The arguments passed in to the function
  void onStep(in mozIStorageValueArray aFunctionArguments);

   * Called when all tuples in a group have been processed and the engine
   * needs the aggregate function's value.
   * @returns aggregate result as Variant.
  nsIVariant onFinal();