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// Copyright 2019 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_OPTIMIZATION_GUIDE_CORE_DELIVERY_PREDICTION_MODEL_FETCHER_H_
#define COMPONENTS_OPTIMIZATION_GUIDE_CORE_DELIVERY_PREDICTION_MODEL_FETCHER_H_
#include <optional>
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "components/optimization_guide/proto/models.pb.h"
namespace optimization_guide {
// Callback to inform the caller that the remote hints have been fetched and
// to pass back the fetched hints response from the remote Optimization Guide
// Service.
using ModelsFetchedCallback = base::OnceCallback<void(
std::optional<
std::unique_ptr<optimization_guide::proto::GetModelsResponse>>)>;
// A class to handle requests for prediction models (and prediction data) from
// a remote Optimization Guide Service.
//
// This class fetches new models from the remote Optimization Guide Service.
class PredictionModelFetcher {
public:
PredictionModelFetcher() = default;
PredictionModelFetcher(const PredictionModelFetcher&) = delete;
PredictionModelFetcher& operator=(const PredictionModelFetcher&) = delete;
virtual ~PredictionModelFetcher() = default;
// Requests PredictionModels and HostModelFeatures from the Optimization Guide
// Service if a request for them is not already in progress. Returns whether a
// new request was issued. |models_fetched_callback| is called when the
// request is complete providing the GetModelsResponse object if successful or
// nullopt if the fetch failed or no fetch is needed. Virtualized for testing.
virtual bool FetchOptimizationGuideServiceModels(
const std::vector<proto::ModelInfo>& models_request_info,
proto::RequestContext request_context,
const std::string& locale,
ModelsFetchedCallback models_fetched_callback) = 0;
};
} // namespace optimization_guide
#endif // COMPONENTS_OPTIMIZATION_GUIDE_CORE_DELIVERY_PREDICTION_MODEL_FETCHER_H_
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