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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 COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_PROVIDER_H_
#define COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_PROVIDER_H_
#include <memory>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "components/ntp_snippets/content_suggestions_provider.h"
namespace ntp_snippets {
class RemoteSuggestionsFetcher;
// Retrieves fresh content data (articles) from the server, stores them and
// provides them as content suggestions.
class RemoteSuggestionsProvider : public ContentSuggestionsProvider {
public:
// Callback to notify with the result of a fetch.
using FetchStatusCallback = base::OnceCallback<void(Status status_code)>;
~RemoteSuggestionsProvider() override;
// Fetches suggestions from the server for all remote categories and replaces
// old suggestions by the new ones. The request to the server is performed as
// an background request. Background requests are used for actions not
// triggered by the user and have lower priority on the server. After the
// fetch finished, the provided |callback| will be triggered with the status
// of the fetch (unless nullptr). If the provider is not ready(), the fetch
// fails and the callback gets immediately called with an error message.
virtual void RefetchInTheBackground(FetchStatusCallback callback) = 0;
// Refetches the suggestions in a state ready for display. Similar to
// |RefetchInTheBackground| above, but observers will be notified about the
// ongoing refetch and may be notified with old suggestions if the fetch fails
// or does not finish before timeout.
virtual void RefetchWhileDisplaying(FetchStatusCallback callback) = 0;
virtual const RemoteSuggestionsFetcher* suggestions_fetcher_for_debugging()
const = 0;
// Get the url with favicon for the suggestion.
virtual GURL GetUrlWithFavicon(
const ContentSuggestion::ID& suggestion_id) const = 0;
// Whether the provider is explicity disabled.
virtual bool IsDisabled() const = 0;
// Whether the provider is ready to fetch suggestions. While the provider is
// not ready, all operations on it will fail or get ignored.
virtual bool ready() const = 0;
protected:
RemoteSuggestionsProvider(Observer* observer);
};
} // namespace ntp_snippets
#endif // COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_PROVIDER_H_
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