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// Copyright 2013 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_PREFS_PREF_METRICS_SERVICE_H_
#define CHROME_BROWSER_PREFS_PREF_METRICS_SERVICE_H_
#include <map>
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/profiles/profile.h"
#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/syncable_prefs/synced_pref_change_registrar.h"
class PrefRegistrySimple;
// PrefMetricsService is responsible for recording prefs-related UMA stats.
class PrefMetricsService : public KeyedService {
public:
explicit PrefMetricsService(Profile* profile);
~PrefMetricsService() override;
class Factory : public BrowserContextKeyedServiceFactory {
public:
static Factory* GetInstance();
static PrefMetricsService* GetForProfile(Profile* profile);
private:
friend struct base::DefaultSingletonTraits<Factory>;
Factory();
~Factory() override;
// BrowserContextKeyedServiceFactory implementation
KeyedService* BuildServiceInstanceFor(
content::BrowserContext* profile) const override;
bool ServiceIsCreatedWithBrowserContext() const override;
bool ServiceIsNULLWhileTesting() const override;
content::BrowserContext* GetBrowserContextToUse(
content::BrowserContext* context) const override;
};
private:
friend class PrefMetricsServiceTest;
// Function to log a Value to a histogram
typedef base::Callback<void(const std::string&, const base::Value*)>
LogHistogramValueCallback;
// For unit testing only.
PrefMetricsService(Profile* profile, PrefService* local_settings);
// Record prefs state on browser context creation.
void RecordLaunchPrefs();
// Register callbacks for synced pref changes.
void RegisterSyncedPrefObservers();
// Registers a histogram logging callback for a synced pref change.
void AddPrefObserver(const std::string& path,
const std::string& histogram_name_prefix,
const LogHistogramValueCallback& callback);
// Generic callback to observe a synced pref change.
void OnPrefChanged(const std::string& histogram_name_prefix,
const LogHistogramValueCallback& callback,
const std::string& path,
bool from_sync);
// Callback for a boolean pref change histogram.
void LogBooleanPrefChange(const std::string& histogram_name,
const base::Value* value);
// Callback for an integer pref change histogram.
void LogIntegerPrefChange(int boundary_value,
const std::string& histogram_name,
const base::Value* value);
Profile* profile_;
PrefService* prefs_;
PrefService* local_state_;
scoped_ptr<syncable_prefs::SyncedPrefChangeRegistrar>
synced_pref_change_registrar_;
base::WeakPtrFactory<PrefMetricsService> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(PrefMetricsService);
};
#endif // CHROME_BROWSER_PREFS_PREF_METRICS_SERVICE_H_
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