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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_IDLE_API_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_IDLE_API_H_
#pragma once
#include "chrome/browser/idle.h"
#include "chrome/browser/extensions/extension_function.h"
class Profile;
// Event router class for events related to the idle API.
class ExtensionIdleEventRouter {
public:
static void OnIdleStateChange(Profile* profile,
IdleState idleState);
private:
DISALLOW_COPY_AND_ASSIGN(ExtensionIdleEventRouter);
};
// Implementation of the chrome.idle.queryState API.
class ExtensionIdleQueryStateFunction : public AsyncExtensionFunction {
public:
virtual bool RunImpl();
DECLARE_EXTENSION_FUNCTION_NAME("idle.queryState")
private:
void IdleStateCallback(int threshold, IdleState state);
};
// Class used for caching answers from CalculateIdleState.
class ExtensionIdleCache {
public:
static IdleState CalculateIdleState(int threshold);
static void UpdateCache(int threshold, IdleState state);
private:
FRIEND_TEST_ALL_PREFIXES(ExtensionIdleApiTest, CacheTest);
struct CacheData {
// Latest moment in history after which we are certain that there was some
// activity. If we are querying for a threshold beyond this moment, we know
// the result will be active.
double latest_known_active;
// [idle_interval_start, idle_interval_end] is the latest interval in
// history for which we are certain there was no activity.
double idle_interval_start;
double idle_interval_end;
// Set iff the last recored query result was IDLE_STATE_LOCKED. Equals the
// moment the result was recorded in cache.
double latest_locked;
};
// We assume moment is increasing with every call to one of these two methods.
// Tries to determine the idle state based on results of previous queries.
// |threshold| is time span in seconds from now we consider in calculating
// state.
// |moment| is the moment in time this method was called (should be equal to
// now, except in tests).
// Returns calculated state, or IDLE_STATE_UNKNOWN if the state could not be
// determined.
static IdleState CalculateState(int threshold, double moment);
// Updates cached data with the latest query result.
// |threshold| is threshold parameter of the query.
// |state| is result of the query.
// |moment| is moment in time this method is called.
static void Update(int threshold, IdleState state, double moment);
static int get_min_threshold();
static double get_throttle_interval();
static CacheData cached_data;
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_IDLE_API_H_
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