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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_QUERY_TILES_INTERNAL_INIT_AWARE_TILE_SERVICE_H_
#define COMPONENTS_QUERY_TILES_INTERNAL_INIT_AWARE_TILE_SERVICE_H_
#include <deque>
#include <memory>
#include "base/memory/weak_ptr.h"
#include "components/query_tiles/internal/tile_service_impl.h"
#include "components/query_tiles/tile_service.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace query_tiles {
// TileService that can cache API calls before the underlying |tile_service_| is
// initialized. After a successful initialization of |tile_service_|, all cached
// API calls will be invoked in sequence. If failed to initialize, cached API
// calls will be invoked with empty data.
class InitAwareTileService : public TileService {
public:
explicit InitAwareTileService(
std::unique_ptr<InitializableTileService> tile_service);
~InitAwareTileService() override;
private:
// TileService implementation.
void GetQueryTiles(GetTilesCallback callback) override;
void GetTile(const std::string& tile_id, TileCallback callback) override;
void StartFetchForTiles(bool is_from_reduced_mode,
BackgroundTaskFinishedCallback callback) override;
void CancelTask() override;
void PurgeDb() override;
void SetServerUrl(const std::string& base_url) override;
void OnTileClicked(const std::string& tile_id) override;
void OnQuerySelected(const absl::optional<std::string>& parent_tile_id,
const std::u16string& query_text) override;
Logger* GetLogger() override;
void OnTileServiceInitialized(bool success);
void MaybeCacheApiCall(base::OnceClosure api_call);
// Returns whether |tile_service_| is successfully initialized.
bool IsReady() const;
// Returns whether |tile_service_| is failed to initialize.
bool IsFailed() const;
std::unique_ptr<InitializableTileService> tile_service_;
std::deque<base::OnceClosure> cached_api_calls_;
// The initialization result of |tile_service_|.
absl::optional<bool> init_success_;
base::WeakPtrFactory<InitAwareTileService> weak_ptr_factory_{this};
};
} // namespace query_tiles
#endif // COMPONENTS_QUERY_TILES_INTERNAL_INIT_AWARE_TILE_SERVICE_H_
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