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// Copyright 2017 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 COMPONENTS_DOODLE_DOODLE_SERVICE_H_
#define COMPONENTS_DOODLE_DOODLE_SERVICE_H_
#include <memory>
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/optional.h"
#include "components/doodle/doodle_fetcher.h"
#include "components/doodle/doodle_types.h"
namespace doodle {
class DoodleService {
public:
class Observer {
public:
virtual void OnDoodleConfigUpdated(const base::Optional<DoodleConfig>&) = 0;
};
DoodleService(std::unique_ptr<DoodleFetcher> fetcher);
~DoodleService();
// Returns the current (cached) config, if any.
const base::Optional<DoodleConfig>& config() const { return cached_config_; }
// Adds a new observer to the service. It'll only be called when the config
// changes; to get the current (cached) config, call |config()|.
void AddObserver(Observer* observer);
// Prevents |observer| from receiving future updates. This is safe to call
// even when the observer is being notified of an update.
void RemoveObserver(Observer* observer);
// Requests an asynchronous refresh of the DoodleConfig from the network.
// After the update completes, the observers will be notified only if the
// config changed.
void Refresh();
private:
void DoodleFetched(DoodleState state,
const base::Optional<DoodleConfig>& doodle_config);
// The fetcher for getting fresh DoodleConfigs from the network.
std::unique_ptr<DoodleFetcher> fetcher_;
// The result of the last network fetch.
base::Optional<DoodleConfig> cached_config_;
// The list of observers to be notified when the DoodleConfig changes.
base::ObserverList<Observer> observers_;
DISALLOW_COPY_AND_ASSIGN(DoodleService);
};
} // namespace doodle
#endif // COMPONENTS_DOODLE_DOODLE_SERVICE_H_
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