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// Copyright 2012 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_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
#define CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
#include <string>
#include "base/callback_forward.h"
#include "base/callback_list.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/web_resource/chrome_web_resource_service.h"
class NotificationPromo;
class PrefRegistrySimple;
class PrefService;
namespace base {
class DictionaryValue;
}
namespace user_prefs {
class PrefRegistrySyncable;
}
// A PromoResourceService fetches data from a web resource server to be used to
// dynamically change the appearance of the New Tab Page. For example, it has
// been used to fetch "tips" to be displayed on the NTP, or to display
// promotional messages to certain groups of Chrome users.
class PromoResourceService : public ChromeWebResourceService {
public:
using StateChangedCallbackList = base::CallbackList<void()>;
using StateChangedSubscription = StateChangedCallbackList::Subscription;
static void RegisterPrefs(PrefRegistrySimple* registry);
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
static void MigrateUserPrefs(PrefService* user_prefs);
PromoResourceService();
~PromoResourceService() override;
// Registers a callback called when the state of a web resource has been
// changed. A resource may have been added, removed, or altered.
scoped_ptr<StateChangedSubscription> RegisterStateChangedCallback(
const base::Closure& closure);
private:
// Schedule a notification that a web resource is either going to become
// available or be no longer valid.
void ScheduleNotification(const NotificationPromo& notification_promo);
// Schedules the initial notification for when the web resource is going
// to become available or no longer valid. This performs a few additional
// checks than ScheduleNotification, namely it schedules updates immediately
// if the promo service or Chrome locale has changed.
void ScheduleNotificationOnInit();
// If delay_ms is positive, schedule notification with the delay.
// If delay_ms is 0, notify immediately by calling WebResourceStateChange().
// If delay_ms is negative, do nothing.
void PostNotification(int64 delay_ms);
// Notify listeners that the state of a web resource has changed.
void PromoResourceStateChange();
// WebResourceService override to process the parsed information.
void Unpack(const base::DictionaryValue& parsed_json) override;
// List of callbacks called when the state of a web resource has changed.
StateChangedCallbackList callback_list_;
// Allows the creation of tasks to send a notification.
// This allows the PromoResourceService to notify the New Tab Page immediately
// when a new web resource should be shown or removed.
base::WeakPtrFactory<PromoResourceService> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PromoResourceService);
};
#endif // CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
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