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// Copyright 2015 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_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_H_
#define CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/extensions/api/settings_private/generated_pref.h"
#include "chrome/browser/extensions/api/settings_private/prefs_util.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/prefs/pref_change_registrar.h"
#include "extensions/browser/event_router.h"
// TODO(wychen): ChromeOS headers should only be included when building
// ChromeOS, and the following headers should be guarded by
// #if defined(OS_CHROMEOS). However, the types are actually
// used, and it takes another CL to clean them up.
// Reference: crbug.com/720159
#include "chrome/browser/chromeos/settings/cros_settings.h"
namespace content {
class BrowserContext;
}
namespace extensions {
// This is an event router that will observe listeners to pref changes on the
// appropriate pref service(s) and notify listeners on the JavaScript
// settingsPrivate API.
class SettingsPrivateEventRouter
: public KeyedService,
public EventRouter::Observer,
public settings_private::GeneratedPref::Observer {
public:
static SettingsPrivateEventRouter* Create(
content::BrowserContext* browser_context);
~SettingsPrivateEventRouter() override;
// settings_private::GeneratedPref::Observer implementation.
void OnGeneratedPrefChanged(const std::string& pref_name) override;
protected:
explicit SettingsPrivateEventRouter(content::BrowserContext* context);
// KeyedService overrides:
void Shutdown() override;
// EventRouter::Observer overrides:
void OnListenerAdded(const EventListenerInfo& details) override;
void OnListenerRemoved(const EventListenerInfo& details) override;
// This registrar monitors for user prefs changes.
PrefChangeRegistrar user_prefs_registrar_;
// This registrar monitors for local state changes.
PrefChangeRegistrar local_state_registrar_;
private:
// Decide if we should listen for pref changes or not. If there are any
// JavaScript listeners registered for the onPrefsChanged event, then we
// want to register for change notification from the PrefChangeRegistrar.
// Otherwise, we want to unregister and not be listening for pref changes.
void StartOrStopListeningForPrefsChanges();
void OnPreferenceChanged(const std::string& pref_name);
// Sends a pref change to any listeners (if they exist; no-ops otherwise).
void SendPrefChange(const std::string& pref_name);
PrefChangeRegistrar* FindRegistrarForPref(const std::string& pref_name);
using SubscriptionMap =
std::map<std::string,
std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>>;
SubscriptionMap cros_settings_subscription_map_;
content::BrowserContext* context_;
bool listening_;
std::unique_ptr<PrefsUtil> prefs_util_;
base::WeakPtrFactory<SettingsPrivateEventRouter> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(SettingsPrivateEventRouter);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_H_
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